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Finish converting existing comments for internal API docs (#8146)

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* Finish converting existing comments for internal API docs

99% of this was just reformatting existing comments. Only two exceptions:

- Expanded upon `BuildResult::status` compat note

- Split up file-level `symbol-table.hh` doc comments to get
  per-definition docs

Also fixed a few whitespace goofs, turning leading tabs to spaces and
removing trailing spaces.

Picking up from #8133

* Fix two things from comments

* Use triple-backtick not indent for `dumpPath`

* Convert GNU-style `\`..'` quotes to markdown style in API docs

This will render correctly.
This commit is contained in:
John Ericson 2023-04-07 09:55:28 -04:00 committed by GitHub
parent 54b3b6ebc6
commit 0746951be1
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GPG key ID: 4AEE18F83AFDEB23
53 changed files with 1907 additions and 938 deletions
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6
src/libcmd/editor-for.hh
View file

@ -5,8 +5,10 @@
namespace nix {
/* Helper function to generate args that invoke $EDITOR on
filename:lineno. */
/**
* Helper function to generate args that invoke $EDITOR on
* filename:lineno.
*/
Strings editorFor(const Path & file, uint32_t line);
}

4
src/libexpr/attr-path.hh
View file

@ -17,7 +17,9 @@ std::pair<Value *, PosIdx> findAlongAttrPath(
Bindings & autoArgs,
Value & vIn);
/* Heuristic to find the filename and lineno or a nix value. */
/**
* Heuristic to find the filename and lineno or a nix value.
*/
std::pair<std::string, uint32_t> findPackageFilename(EvalState & state, Value & v, std::string what);
std::vector<Symbol> parseAttrPath(EvalState & state, std::string_view s);

26
src/libexpr/attr-set.hh
View file

@ -13,7 +13,9 @@ namespace nix {
class EvalState;
struct Value;
/* Map one attribute name to its value. */
/**
* Map one attribute name to its value.
*/
struct Attr
{
/* the placement of `name` and `pos` in this struct is important.
@ -37,10 +39,12 @@ static_assert(sizeof(Attr) == 2 * sizeof(uint32_t) + sizeof(Value *),
"avoid introducing any padding into Attr if at all possible, and do not "
"introduce new fields that need not be present for almost every instance.");
/* Bindings contains all the attributes of an attribute set. It is defined
by its size and its capacity, the capacity being the number of Attr
elements allocated after this structure, while the size corresponds to
the number of elements already inserted in this structure. */
/**
* Bindings contains all the attributes of an attribute set. It is defined
* by its size and its capacity, the capacity being the number of Attr
* elements allocated after this structure, while the size corresponds to
* the number of elements already inserted in this structure.
*/
class Bindings
{
public:
@ -95,7 +99,9 @@ public:
size_t capacity() { return capacity_; }
/* Returns the attributes in lexicographically sorted order. */
/**
* Returns the attributes in lexicographically sorted order.
*/
std::vector<const Attr *> lexicographicOrder(const SymbolTable & symbols) const
{
std::vector<const Attr *> res;
@ -112,9 +118,11 @@ public:
friend class EvalState;
};
/* A wrapper around Bindings that ensures that its always in sorted
order at the end. The only way to consume a BindingsBuilder is to
call finish(), which sorts the bindings. */
/**
* A wrapper around Bindings that ensures that its always in sorted
* order at the end. The only way to consume a BindingsBuilder is to
* call finish(), which sorts the bindings.
*/
class BindingsBuilder
{
Bindings * bindings;

10
src/libexpr/eval-cache.hh
View file

@ -110,8 +110,10 @@ public:
ref<AttrCursor> getAttr(std::string_view name);
/* Get an attribute along a chain of attrsets. Note that this does
not auto-call functors or functions. */
/**
* Get an attribute along a chain of attrsets. Note that this does
* not auto-call functors or functions.
*/
OrSuggestions<ref<AttrCursor>> findAlongAttrPath(const std::vector<Symbol> & attrPath, bool force = false);
std::string getString();
@ -130,7 +132,9 @@ public:
Value & forceValue();
/* Force creation of the .drv file in the Nix store. */
/**
* Force creation of the .drv file in the Nix store.
*/
StorePath forceDerivation();
};

4
src/libexpr/eval-inline.hh
View file

@ -5,7 +5,9 @@
namespace nix {
/* Note: Various places expect the allocated memory to be zeroed. */
/**
* Note: Various places expect the allocated memory to be zeroed.
*/
[[gnu::always_inline]]
inline void * allocBytes(size_t n)
{

238
src/libexpr/eval.hh
View file

@ -43,7 +43,10 @@ struct PrimOp
struct Env
{
Env * up;
unsigned short prevWith:14; // nr of levels up to next `with' environment
/**
* Number of of levels up to next `with` environment
*/
unsigned short prevWith:14;
enum { Plain = 0, HasWithExpr, HasWithAttrs } type:2;
Value * values[0];
};
@ -56,8 +59,10 @@ std::unique_ptr<ValMap> mapStaticEnvBindings(const SymbolTable & st, const Stati
void copyContext(const Value & v, PathSet & context);
/* Cache for calls to addToStore(); maps source paths to the store
paths. */
/**
* Cache for calls to addToStore(); maps source paths to the store
* paths.
*/
typedef std::map<Path, StorePath> SrcToStore;
@ -69,7 +74,9 @@ typedef std::pair<std::string, std::string> SearchPathElem;
typedef std::list<SearchPathElem> SearchPath;
/* Initialise the Boehm GC, if applicable. */
/**
* Initialise the Boehm GC, if applicable.
*/
void initGC();
@ -144,26 +151,36 @@ public:
sOutputSpecified;
Symbol sDerivationNix;
/* If set, force copying files to the Nix store even if they
already exist there. */
/**
* If set, force copying files to the Nix store even if they
* already exist there.
*/
RepairFlag repair;
/* The allowed filesystem paths in restricted or pure evaluation
mode. */
/**
* The allowed filesystem paths in restricted or pure evaluation
* mode.
*/
std::optional<PathSet> allowedPaths;
Bindings emptyBindings;
/* Store used to materialise .drv files. */
/**
* Store used to materialise .drv files.
*/
const ref<Store> store;
/* Store used to build stuff. */
/**
* Store used to build stuff.
*/
const ref<Store> buildStore;
RootValue vCallFlake = nullptr;
RootValue vImportedDrvToDerivation = nullptr;
/* Debugger */
/**
* Debugger
*/
void (* debugRepl)(ref<EvalState> es, const ValMap & extraEnv);
bool debugStop;
bool debugQuit;
@ -219,7 +236,9 @@ public:
private:
SrcToStore srcToStore;
/* A cache from path names to parse trees. */
/**
* A cache from path names to parse trees.
*/
#if HAVE_BOEHMGC
typedef std::map<Path, Expr *, std::less<Path>, traceable_allocator<std::pair<const Path, Expr *>>> FileParseCache;
#else
@ -227,7 +246,9 @@ private:
#endif
FileParseCache fileParseCache;
/* A cache from path names to values. */
/**
* A cache from path names to values.
*/
#if HAVE_BOEHMGC
typedef std::map<Path, Value, std::less<Path>, traceable_allocator<std::pair<const Path, Value>>> FileEvalCache;
#else
@ -239,17 +260,25 @@ private:
std::map<std::string, std::pair<bool, std::string>> searchPathResolved;
/* Cache used by checkSourcePath(). */
/**
* Cache used by checkSourcePath().
*/
std::unordered_map<Path, Path> resolvedPaths;
/* Cache used by prim_match(). */
/**
* Cache used by prim_match().
*/
std::shared_ptr<RegexCache> regexCache;
#if HAVE_BOEHMGC
/* Allocation cache for GC'd Value objects. */
/**
* Allocation cache for GC'd Value objects.
*/
std::shared_ptr<void *> valueAllocCache;
/* Allocation cache for size-1 Env objects. */
/**
* Allocation cache for size-1 Env objects.
*/
std::shared_ptr<void *> env1AllocCache;
#endif
@ -265,47 +294,65 @@ public:
SearchPath getSearchPath() { return searchPath; }
/* Allow access to a path. */
/**
* Allow access to a path.
*/
void allowPath(const Path & path);
/* Allow access to a store path. Note that this gets remapped to
the real store path if `store` is a chroot store. */
/**
* Allow access to a store path. Note that this gets remapped to
* the real store path if `store` is a chroot store.
*/
void allowPath(const StorePath & storePath);
/* Allow access to a store path and return it as a string. */
/**
* Allow access to a store path and return it as a string.
*/
void allowAndSetStorePathString(const StorePath & storePath, Value & v);
/* Check whether access to a path is allowed and throw an error if
not. Otherwise return the canonicalised path. */
/**
* Check whether access to a path is allowed and throw an error if
* not. Otherwise return the canonicalised path.
*/
Path checkSourcePath(const Path & path);
void checkURI(const std::string & uri);
/* When using a diverted store and 'path' is in the Nix store, map
'path' to the diverted location (e.g. /nix/store/foo is mapped
to /home/alice/my-nix/nix/store/foo). However, this is only
done if the context is not empty, since otherwise we're
probably trying to read from the actual /nix/store. This is
intended to distinguish between import-from-derivation and
sources stored in the actual /nix/store. */
/**
* When using a diverted store and 'path' is in the Nix store, map
* 'path' to the diverted location (e.g. /nix/store/foo is mapped
* to /home/alice/my-nix/nix/store/foo). However, this is only
* done if the context is not empty, since otherwise we're
* probably trying to read from the actual /nix/store. This is
* intended to distinguish between import-from-derivation and
* sources stored in the actual /nix/store.
*/
Path toRealPath(const Path & path, const PathSet & context);
/* Parse a Nix expression from the specified file. */
/**
* Parse a Nix expression from the specified file.
*/
Expr * parseExprFromFile(const Path & path);
Expr * parseExprFromFile(const Path & path, std::shared_ptr<StaticEnv> & staticEnv);
/* Parse a Nix expression from the specified string. */
/**
* Parse a Nix expression from the specified string.
*/
Expr * parseExprFromString(std::string s, const Path & basePath, std::shared_ptr<StaticEnv> & staticEnv);
Expr * parseExprFromString(std::string s, const Path & basePath);
Expr * parseStdin();
/* Evaluate an expression read from the given file to normal
form. Optionally enforce that the top-level expression is
trivial (i.e. doesn't require arbitrary computation). */
/**
* Evaluate an expression read from the given file to normal
* form. Optionally enforce that the top-level expression is
* trivial (i.e. doesn't require arbitrary computation).
*/
void evalFile(const Path & path, Value & v, bool mustBeTrivial = false);
/* Like `evalFile`, but with an already parsed expression. */
/**
* Like `evalFile`, but with an already parsed expression.
*/
void cacheFile(
const Path & path,
const Path & resolvedPath,
@ -315,37 +362,52 @@ public:
void resetFileCache();
/* Look up a file in the search path. */
/**
* Look up a file in the search path.
*/
Path findFile(const std::string_view path);
Path findFile(SearchPath & searchPath, const std::string_view path, const PosIdx pos = noPos);
/* If the specified search path element is a URI, download it. */
/**
* If the specified search path element is a URI, download it.
*/
std::pair<bool, std::string> resolveSearchPathElem(const SearchPathElem & elem);
/* Evaluate an expression to normal form, storing the result in
value `v'. */
/**
* Evaluate an expression to normal form
*
* @param [out] v The resulting is stored here.
*/
void eval(Expr * e, Value & v);
/* Evaluation the expression, then verify that it has the expected
type. */
/**
* Evaluation the expression, then verify that it has the expected
* type.
*/
inline bool evalBool(Env & env, Expr * e);
inline bool evalBool(Env & env, Expr * e, const PosIdx pos, std::string_view errorCtx);
inline void evalAttrs(Env & env, Expr * e, Value & v, const PosIdx pos, std::string_view errorCtx);
/* If `v' is a thunk, enter it and overwrite `v' with the result
of the evaluation of the thunk. If `v' is a delayed function
application, call the function and overwrite `v' with the
result. Otherwise, this is a no-op. */
/**
* If `v` is a thunk, enter it and overwrite `v` with the result
* of the evaluation of the thunk. If `v` is a delayed function
* application, call the function and overwrite `v` with the
* result. Otherwise, this is a no-op.
*/
inline void forceValue(Value & v, const PosIdx pos);
template <typename Callable>
inline void forceValue(Value & v, Callable getPos);
/* Force a value, then recursively force list elements and
attributes. */
/**
* Force a value, then recursively force list elements and
* attributes.
*/
void forceValueDeep(Value & v);
/* Force `v', and then verify that it has the expected type. */
/**
* Force `v`, and then verify that it has the expected type.
*/
NixInt forceInt(Value & v, const PosIdx pos, std::string_view errorCtx);
NixFloat forceFloat(Value & v, const PosIdx pos, std::string_view errorCtx);
bool forceBool(Value & v, const PosIdx pos, std::string_view errorCtx);
@ -356,7 +418,10 @@ public:
inline void forceAttrs(Value & v, Callable getPos, std::string_view errorCtx);
inline void forceList(Value & v, const PosIdx pos, std::string_view errorCtx);
void forceFunction(Value & v, const PosIdx pos, std::string_view errorCtx); // either lambda or primop
/**
* @param v either lambda or primop
*/
void forceFunction(Value & v, const PosIdx pos, std::string_view errorCtx);
std::string_view forceString(Value & v, const PosIdx pos, std::string_view errorCtx);
std::string_view forceString(Value & v, PathSet & context, const PosIdx pos, std::string_view errorCtx);
std::string_view forceStringNoCtx(Value & v, const PosIdx pos, std::string_view errorCtx);
@ -367,17 +432,23 @@ public:
void addErrorTrace(Error & e, const PosIdx pos, const char * s, const std::string & s2, bool frame = false) const;
public:
/* Return true iff the value `v' denotes a derivation (i.e. a
set with attribute `type = "derivation"'). */
/**
* @return true iff the value `v` denotes a derivation (i.e. a
* set with attribute `type = "derivation"`).
*/
bool isDerivation(Value & v);
std::optional<std::string> tryAttrsToString(const PosIdx pos, Value & v,
PathSet & context, bool coerceMore = false, bool copyToStore = true);
/* String coercion. Converts strings, paths and derivations to a
string. If `coerceMore' is set, also converts nulls, integers,
booleans and lists to a string. If `copyToStore' is set,
referenced paths are copied to the Nix store as a side effect. */
/**
* String coercion.
*
* Converts strings, paths and derivations to a
* string. If `coerceMore` is set, also converts nulls, integers,
* booleans and lists to a string. If `copyToStore` is set,
* referenced paths are copied to the Nix store as a side effect.
*/
BackedStringView coerceToString(const PosIdx pos, Value & v, PathSet & context,
std::string_view errorCtx,
bool coerceMore = false, bool copyToStore = true,
@ -385,21 +456,31 @@ public:
StorePath copyPathToStore(PathSet & context, const Path & path);
/* Path coercion. Converts strings, paths and derivations to a
path. The result is guaranteed to be a canonicalised, absolute
path. Nothing is copied to the store. */
/**
* Path coercion.
*
* Converts strings, paths and derivations to a
* path. The result is guaranteed to be a canonicalised, absolute
* path. Nothing is copied to the store.
*/
Path coerceToPath(const PosIdx pos, Value & v, PathSet & context, std::string_view errorCtx);
/* Like coerceToPath, but the result must be a store path. */
/**
* Like coerceToPath, but the result must be a store path.
*/
StorePath coerceToStorePath(const PosIdx pos, Value & v, PathSet & context, std::string_view errorCtx);
public:
/* The base environment, containing the builtin functions and
values. */
/**
* The base environment, containing the builtin functions and
* values.
*/
Env & baseEnv;
/* The same, but used during parsing to resolve variables. */
/**
* The same, but used during parsing to resolve variables.
*/
std::shared_ptr<StaticEnv> staticBaseEnv; // !!! should be private
private:
@ -449,8 +530,10 @@ private:
public:
/* Do a deep equality test between two values. That is, list
elements and attributes are compared recursively. */
/**
* Do a deep equality test between two values. That is, list
* elements and attributes are compared recursively.
*/
bool eqValues(Value & v1, Value & v2, const PosIdx pos, std::string_view errorCtx);
bool isFunctor(Value & fun);
@ -464,11 +547,15 @@ public:
callFunction(fun, 1, args, vRes, pos);
}
/* Automatically call a function for which each argument has a
default value or has a binding in the `args' map. */
/**
* Automatically call a function for which each argument has a
* default value or has a binding in the `args` map.
*/
void autoCallFunction(Bindings & args, Value & fun, Value & res);
/* Allocation primitives. */
/**
* Allocation primitives.
*/
inline Value * allocValue();
inline Env & allocEnv(size_t size);
@ -488,10 +575,13 @@ public:
void concatLists(Value & v, size_t nrLists, Value * * lists, const PosIdx pos, std::string_view errorCtx);
/* Print statistics. */
/**
* Print statistics.
*/
void printStats();
/* Realise the given context, and return a mapping from the placeholders
/**
* Realise the given context, and return a mapping from the placeholders
* used to construct the associated value to their final store path
*/
[[nodiscard]] StringMap realiseContext(const PathSet & context);
@ -551,11 +641,15 @@ struct DebugTraceStacker {
DebugTrace trace;
};
/* Return a string representing the type of the value `v'. */
/**
* @return A string representing the type of the value `v`.
*/
std::string_view showType(ValueType type);
std::string showType(const Value & v);
/* If `path' refers to a directory, then append "/default.nix". */
/**
* If `path` refers to a directory, then append "/default.nix".
*/
Path resolveExprPath(Path path);
struct InvalidPathError : EvalError

111
src/libexpr/flake/flake.hh
View file

@ -18,7 +18,8 @@ struct FlakeInput;
typedef std::map<FlakeId, FlakeInput> FlakeInputs;
/* FlakeInput is the 'Flake'-level parsed form of the "input" entries
/**
* FlakeInput is the 'Flake'-level parsed form of the "input" entries
* in the flake file.
*
* A FlakeInput is normally constructed by the 'parseFlakeInput'
@ -42,7 +43,12 @@ typedef std::map<FlakeId, FlakeInput> FlakeInputs;
struct FlakeInput
{
std::optional<FlakeRef> ref;
bool isFlake = true; // true = process flake to get outputs, false = (fetched) static source path
/**
* true = process flake to get outputs
*
* false = (fetched) static source path
*/
bool isFlake = true;
std::optional<InputPath> follows;
FlakeInputs overrides;
};
@ -56,23 +62,42 @@ struct ConfigFile
void apply();
};
/* The contents of a flake.nix file. */
/**
* The contents of a flake.nix file.
*/
struct Flake
{
FlakeRef originalRef; // the original flake specification (by the user)
FlakeRef resolvedRef; // registry references and caching resolved to the specific underlying flake
FlakeRef lockedRef; // the specific local store result of invoking the fetcher
bool forceDirty = false; // pretend that 'lockedRef' is dirty
/**
* The original flake specification (by the user)
*/
FlakeRef originalRef;
/**
* registry references and caching resolved to the specific underlying flake
*/
FlakeRef resolvedRef;
/**
* the specific local store result of invoking the fetcher
*/
FlakeRef lockedRef;
/**
* pretend that 'lockedRef' is dirty
*/
bool forceDirty = false;
std::optional<std::string> description;
std::shared_ptr<const fetchers::Tree> sourceInfo;
FlakeInputs inputs;
ConfigFile config; // 'nixConfig' attribute
/**
* 'nixConfig' attribute
*/
ConfigFile config;
~Flake();
};
Flake getFlake(EvalState & state, const FlakeRef & flakeRef, bool allowLookup);
/* Fingerprint of a locked flake; used as a cache key. */
/**
* Fingerprint of a locked flake; used as a cache key.
*/
typedef Hash Fingerprint;
struct LockedFlake
@ -85,50 +110,72 @@ struct LockedFlake
struct LockFlags
{
/* Whether to ignore the existing lock file, creating a new one
from scratch. */
/**
* Whether to ignore the existing lock file, creating a new one
* from scratch.
*/
bool recreateLockFile = false;
/* Whether to update the lock file at all. If set to false, if any
change to the lock file is needed (e.g. when an input has been
added to flake.nix), you get a fatal error. */
/**
* Whether to update the lock file at all. If set to false, if any
* change to the lock file is needed (e.g. when an input has been
* added to flake.nix), you get a fatal error.
*/
bool updateLockFile = true;
/* Whether to write the lock file to disk. If set to true, if the
any changes to the lock file are needed and the flake is not
writable (i.e. is not a local Git working tree or similar), you
get a fatal error. If set to false, Nix will use the modified
lock file in memory only, without writing it to disk. */
/**
* Whether to write the lock file to disk. If set to true, if the
* any changes to the lock file are needed and the flake is not
* writable (i.e. is not a local Git working tree or similar), you
* get a fatal error. If set to false, Nix will use the modified
* lock file in memory only, without writing it to disk.
*/
bool writeLockFile = true;
/* Whether to use the registries to lookup indirect flake
references like 'nixpkgs'. */
/**
* Whether to use the registries to lookup indirect flake
* references like 'nixpkgs'.
*/
std::optional<bool> useRegistries = std::nullopt;
/* Whether to apply flake's nixConfig attribute to the configuration */
/**
* Whether to apply flake's nixConfig attribute to the configuration
*/
bool applyNixConfig = false;
/* Whether unlocked flake references (i.e. those without a Git
revision or similar) without a corresponding lock are
allowed. Unlocked flake references with a lock are always
allowed. */
/**
* Whether unlocked flake references (i.e. those without a Git
* revision or similar) without a corresponding lock are
* allowed. Unlocked flake references with a lock are always
* allowed.
*/
bool allowUnlocked = true;
/* Whether to commit changes to flake.lock. */
/**
* Whether to commit changes to flake.lock.
*/
bool commitLockFile = false;
/* The path to a lock file to read instead of the `flake.lock` file in the top-level flake */
/**
* The path to a lock file to read instead of the `flake.lock` file in the top-level flake
*/
std::optional<std::string> referenceLockFilePath;
/* The path to a lock file to write to instead of the `flake.lock` file in the top-level flake */
/**
* The path to a lock file to write to instead of the `flake.lock` file in the top-level flake
*/
std::optional<Path> outputLockFilePath;
/* Flake inputs to be overridden. */
/**
* Flake inputs to be overridden.
*/
std::map<InputPath, FlakeRef> inputOverrides;
/* Flake inputs to be updated. This means that any existing lock
for those inputs will be ignored. */
/**
* Flake inputs to be updated. This means that any existing lock
* for those inputs will be ignored.
*/
std::set<InputPath> inputUpdates;
};

14
src/libexpr/flake/flakeref.hh
View file

@ -14,7 +14,8 @@ class Store;
typedef std::string FlakeId;
/* A flake reference specifies how to fetch a flake or raw source
/**
* A flake reference specifies how to fetch a flake or raw source
* (e.g. from a Git repository). It is created from a URL-like syntax
* (e.g. 'github:NixOS/patchelf'), an attrset representation (e.g. '{
* type="github"; owner = "NixOS"; repo = "patchelf"; }'), or a local
@ -33,14 +34,17 @@ typedef std::string FlakeId;
* be lazy), but the fetcher can be invoked at any time via the
* FlakeRef to ensure the store is populated with this input.
*/
struct FlakeRef
{
/* Fetcher-specific representation of the input, sufficient to
perform the fetch operation. */
/**
* Fetcher-specific representation of the input, sufficient to
* perform the fetch operation.
*/
fetchers::Input input;
/* sub-path within the fetched input that represents this input */
/**
* sub-path within the fetched input that represents this input
*/
Path subdir;
bool operator==(const FlakeRef & other) const;

20
src/libexpr/flake/lockfile.hh
View file

@ -16,9 +16,11 @@ typedef std::vector<FlakeId> InputPath;
struct LockedNode;
/* A node in the lock file. It has outgoing edges to other nodes (its
inputs). Only the root node has this type; all other nodes have
type LockedNode. */
/**
* A node in the lock file. It has outgoing edges to other nodes (its
* inputs). Only the root node has this type; all other nodes have
* type LockedNode.
*/
struct Node : std::enable_shared_from_this<Node>
{
typedef std::variant<ref<LockedNode>, InputPath> Edge;
@ -28,7 +30,9 @@ struct Node : std::enable_shared_from_this<Node>
virtual ~Node() { }
};
/* A non-root node in the lock file. */
/**
* A non-root node in the lock file.
*/
struct LockedNode : Node
{
FlakeRef lockedRef, originalRef;
@ -63,7 +67,9 @@ struct LockFile
void write(const Path & path) const;
/* Check whether this lock file has any unlocked inputs. */
/**
* Check whether this lock file has any unlocked inputs.
*/
std::optional<FlakeRef> isUnlocked() const;
bool operator ==(const LockFile & other) const;
@ -74,7 +80,9 @@ struct LockFile
static std::string diff(const LockFile & oldLocks, const LockFile & newLocks);
/* Check that every 'follows' input target exists. */
/**
* Check that every 'follows' input target exists.
*/
void check();
};

22
src/libexpr/get-drvs.hh
View file

@ -26,7 +26,10 @@ private:
mutable std::string outputName;
Outputs outputs;
bool failed = false; // set if we get an AssertionError
/**
* Set if we get an AssertionError
*/
bool failed = false;
Bindings * attrs = nullptr, * meta = nullptr;
@ -35,7 +38,10 @@ private:
bool checkMeta(Value & v);
public:
std::string attrPath; /* path towards the derivation */
/**
* path towards the derivation
*/
std::string attrPath;
DrvInfo(EvalState & state) : state(&state) { };
DrvInfo(EvalState & state, std::string attrPath, Bindings * attrs);
@ -47,8 +53,10 @@ public:
StorePath requireDrvPath() const;
StorePath queryOutPath() const;
std::string queryOutputName() const;
/** Return the unordered map of output names to (optional) output paths.
* The "outputs to install" are determined by `meta.outputsToInstall`. */
/**
* Return the unordered map of output names to (optional) output paths.
* The "outputs to install" are determined by `meta.outputsToInstall`.
*/
Outputs queryOutputs(bool withPaths = true, bool onlyOutputsToInstall = false);
StringSet queryMetaNames();
@ -80,8 +88,10 @@ typedef std::list<DrvInfo> DrvInfos;
#endif
/* If value `v' denotes a derivation, return a DrvInfo object
describing it. Otherwise return nothing. */
/**
* If value `v` denotes a derivation, return a DrvInfo object
* describing it. Otherwise return nothing.
*/
std::optional<DrvInfo> getDerivation(EvalState & state,
Value & v, bool ignoreAssertionFailures);

16
src/libexpr/nixexpr.hh
View file

@ -22,7 +22,9 @@ MakeError(UndefinedVarError, Error);
MakeError(MissingArgumentError, EvalError);
MakeError(RestrictedPathError, Error);
/* Position objects. */
/**
* Position objects.
*/
struct Pos
{
uint32_t line;
@ -133,7 +135,9 @@ class EvalState;
struct StaticEnv;
/* An attribute path is a sequence of attribute names. */
/**
* An attribute path is a sequence of attribute names.
*/
struct AttrName
{
Symbol symbol;
@ -213,11 +217,11 @@ struct ExprVar : Expr
or function argument) or from a "with". */
bool fromWith;
/* In the former case, the value is obtained by going `level'
/* In the former case, the value is obtained by going `level`
levels up from the current environment and getting the
`displ'th value in that environment. In the latter case, the
value is obtained by getting the attribute named `name' from
the set stored in the environment that is `level' levels up
`displ`th value in that environment. In the latter case, the
value is obtained by getting the attribute named `name` from
the set stored in the environment that is `level` levels up
from the current one.*/
Level level;
Displacement displ;

16
src/libexpr/primops.hh
View file

@ -23,9 +23,11 @@ struct RegisterPrimOp
typedef std::vector<Info> PrimOps;
static PrimOps * primOps;
/* You can register a constant by passing an arity of 0. fun
will get called during EvalState initialization, so there
may be primops not yet added and builtins is not yet sorted. */
/**
* You can register a constant by passing an arity of 0. fun
* will get called during EvalState initialization, so there
* may be primops not yet added and builtins is not yet sorted.
*/
RegisterPrimOp(
std::string name,
size_t arity,
@ -38,10 +40,14 @@ struct RegisterPrimOp
may wish to use them in limited contexts without globally enabling
them. */
/* Load a ValueInitializer from a DSO and return whatever it initializes */
/**
* Load a ValueInitializer from a DSO and return whatever it initializes
*/
void prim_importNative(EvalState & state, const PosIdx pos, Value * * args, Value & v);
/* Execute a program and parse its output */
/**
* Execute a program and parse its output
*/
void prim_exec(EvalState & state, const PosIdx pos, Value * * args, Value & v);
}

26
src/libexpr/symbol-table.hh
View file

@ -10,15 +10,11 @@
namespace nix {
/* Symbol table used by the parser and evaluator to represent and look
up identifiers and attributes efficiently. SymbolTable::create()
converts a string into a symbol. Symbols have the property that
they can be compared efficiently (using an equality test),
because the symbol table stores only one copy of each string. */
/* This class mainly exists to give us an operator<< for ostreams. We could also
return plain strings from SymbolTable, but then we'd have to wrap every
instance of a symbol that is fmt()ed, which is inconvenient and error-prone. */
/**
* This class mainly exists to give us an operator<< for ostreams. We could also
* return plain strings from SymbolTable, but then we'd have to wrap every
* instance of a symbol that is fmt()ed, which is inconvenient and error-prone.
*/
class SymbolStr
{
friend class SymbolTable;
@ -47,6 +43,11 @@ public:
friend std::ostream & operator <<(std::ostream & os, const SymbolStr & symbol);
};
/**
* Symbols have the property that they can be compared efficiently
* (using an equality test), because the symbol table stores only one
* copy of each string.
*/
class Symbol
{
friend class SymbolTable;
@ -66,6 +67,10 @@ public:
bool operator!=(const Symbol other) const { return id != other.id; }
};
/**
* Symbol table used by the parser and evaluator to represent and look
* up identifiers and attributes efficiently.
*/
class SymbolTable
{
private:
@ -74,6 +79,9 @@ private:
public:
/**
* converts a string into a symbol.
*/
Symbol create(std::string_view s)
{
// Most symbols are looked up more than once, so we trade off insertion performance

95
src/libexpr/value.hh
View file

@ -36,9 +36,11 @@ typedef enum {
tFloat
} InternalType;
// This type abstracts over all actual value types in the language,
// grouping together implementation details like tList*, different function
// types, and types in non-normal form (so thunks and co.)
/**
* This type abstracts over all actual value types in the language,
* grouping together implementation details like tList*, different function
* types, and types in non-normal form (so thunks and co.)
*/
typedef enum {
nThunk,
nInt,
@ -70,38 +72,51 @@ class XMLWriter;
typedef int64_t NixInt;
typedef double NixFloat;
/* External values must descend from ExternalValueBase, so that
/**
* External values must descend from ExternalValueBase, so that
* type-agnostic nix functions (e.g. showType) can be implemented
*/
class ExternalValueBase
{
friend std::ostream & operator << (std::ostream & str, const ExternalValueBase & v);
protected:
/* Print out the value */
/**
* Print out the value
*/
virtual std::ostream & print(std::ostream & str) const = 0;
public:
/* Return a simple string describing the type */
/**
* Return a simple string describing the type
*/
virtual std::string showType() const = 0;
/* Return a string to be used in builtins.typeOf */
/**
* Return a string to be used in builtins.typeOf
*/
virtual std::string typeOf() const = 0;
/* Coerce the value to a string. Defaults to uncoercable, i.e. throws an
/**
* Coerce the value to a string. Defaults to uncoercable, i.e. throws an
* error.
*/
virtual std::string coerceToString(const Pos & pos, PathSet & context, bool copyMore, bool copyToStore) const;
/* Compare to another value of the same type. Defaults to uncomparable,
/**
* Compare to another value of the same type. Defaults to uncomparable,
* i.e. always false.
*/
virtual bool operator ==(const ExternalValueBase & b) const;
/* Print the value as JSON. Defaults to unconvertable, i.e. throws an error */
/**
* Print the value as JSON. Defaults to unconvertable, i.e. throws an error
*/
virtual nlohmann::json printValueAsJSON(EvalState & state, bool strict,
PathSet & context, bool copyToStore = true) const;
/* Print the value as XML. Defaults to unevaluated */
/**
* Print the value as XML. Defaults to unevaluated
*/
virtual void printValueAsXML(EvalState & state, bool strict, bool location,
XMLWriter & doc, PathSet & context, PathSet & drvsSeen,
const PosIdx pos) const;
@ -146,26 +161,28 @@ public:
NixInt integer;
bool boolean;
/* Strings in the evaluator carry a so-called `context' which
is a list of strings representing store paths. This is to
allow users to write things like
/**
* Strings in the evaluator carry a so-called `context` which
* is a list of strings representing store paths. This is to
* allow users to write things like
"--with-freetype2-library=" + freetype + "/lib"
* "--with-freetype2-library=" + freetype + "/lib"
where `freetype' is a derivation (or a source to be copied
to the store). If we just concatenated the strings without
keeping track of the referenced store paths, then if the
string is used as a derivation attribute, the derivation
will not have the correct dependencies in its inputDrvs and
inputSrcs.
* where `freetype` is a derivation (or a source to be copied
* to the store). If we just concatenated the strings without
* keeping track of the referenced store paths, then if the
* string is used as a derivation attribute, the derivation
* will not have the correct dependencies in its inputDrvs and
* inputSrcs.
The semantics of the context is as follows: when a string
with context C is used as a derivation attribute, then the
derivations in C will be added to the inputDrvs of the
derivation, and the other store paths in C will be added to
the inputSrcs of the derivations.
* The semantics of the context is as follows: when a string
* with context C is used as a derivation attribute, then the
* derivations in C will be added to the inputDrvs of the
* derivation, and the other store paths in C will be added to
* the inputSrcs of the derivations.
For canonicity, the store paths should be in sorted order. */
* For canonicity, the store paths should be in sorted order.
*/
struct {
const char * s;
const char * * context; // must be in sorted order
@ -197,8 +214,10 @@ public:
NixFloat fpoint;
};
// Returns the normal type of a Value. This only returns nThunk if the
// Value hasn't been forceValue'd
/**
* Returns the normal type of a Value. This only returns nThunk if
* the Value hasn't been forceValue'd
*/
inline ValueType type() const
{
switch (internalType) {
@ -217,8 +236,10 @@ public:
abort();
}
/* After overwriting an app node, be sure to clear pointers in the
Value to ensure that the target isn't kept alive unnecessarily. */
/**
* After overwriting an app node, be sure to clear pointers in the
* Value to ensure that the target isn't kept alive unnecessarily.
*/
inline void clearValue()
{
app.left = app.right = 0;
@ -366,9 +387,11 @@ public:
PosIdx determinePos(const PosIdx pos) const;
/* Check whether forcing this value requires a trivial amount of
computation. In particular, function applications are
non-trivial. */
/**
* Check whether forcing this value requires a trivial amount of
* computation. In particular, function applications are
* non-trivial.
*/
bool isTrivial() const;
NixStringContext getContext(const Store &);
@ -414,7 +437,9 @@ typedef std::map<Symbol, ValueVector> ValueVectorMap;
#endif
/* A value allocated in traceable memory. */
/**
* A value allocated in traceable memory.
*/
typedef std::shared_ptr<Value *> RootValue;
RootValue allocRootValue(Value * v);

44
src/libexpr/value/context.hh
View file

@ -28,34 +28,37 @@ public:
class Store;
/* Plain opaque path to some store object.
Encoded as just the path: ‘<path>’.
*/
/**
* Plain opaque path to some store object.
*
* Encoded as just the path: ‘<path>’.
*/
struct NixStringContextElem_Opaque {
StorePath path;
GENERATE_CMP(NixStringContextElem_Opaque, me->path);
};
/* Path to a derivation and its entire build closure.
The path doesn't just refer to derivation itself and its closure, but
also all outputs of all derivations in that closure (including the
root derivation).
Encoded in the form ‘=<drvPath>’.
*/
/**
* Path to a derivation and its entire build closure.
*
* The path doesn't just refer to derivation itself and its closure, but
* also all outputs of all derivations in that closure (including the
* root derivation).
*
* Encoded in the form ‘=<drvPath>’.
*/
struct NixStringContextElem_DrvDeep {
StorePath drvPath;
GENERATE_CMP(NixStringContextElem_DrvDeep, me->drvPath);
};
/* Derivation output.
Encoded in the form ‘!<output>!<drvPath>’.
*/
/**
* Derivation output.
*
* Encoded in the form ‘!<output>!<drvPath>’.
*/
struct NixStringContextElem_Built {
StorePath drvPath;
std::string output;
@ -84,10 +87,11 @@ struct NixStringContextElem : _NixStringContextElem_Raw {
return static_cast<Raw &>(*this);
}
/* Decode a context string, one of:
- ‘<path>’
- ‘=<path>’
- ‘!<name>!<path>’
/**
* Decode a context string, one of:
* - ‘<path>’
* - ‘=<path>’
* - ‘!<name>!<path>’
*/
static NixStringContextElem parse(const Store & store, std::string_view s);
std::string to_string(const Store & store) const;

41
src/libfetchers/fetchers.hh
View file

@ -21,14 +21,14 @@ struct Tree
struct InputScheme;
/* The Input object is generated by a specific fetcher, based on the
/**
* The Input object is generated by a specific fetcher, based on the
* user-supplied input attribute in the flake.nix file, and contains
* the information that the specific fetcher needs to perform the
* actual fetch. The Input object is most commonly created via the
* "fromURL()" or "fromAttrs()" static functions which are provided
* the url or attrset specified in the flake file.
*/
struct Input
{
friend struct InputScheme;
@ -38,7 +38,9 @@ struct Input
bool locked = false;
bool direct = true;
/* path of the parent of this input, used for relative path resolution */
/**
* path of the parent of this input, used for relative path resolution
*/
std::optional<Path> parent;
public:
@ -56,27 +58,35 @@ public:
Attrs toAttrs() const;
/* Check whether this is a "direct" input, that is, not
one that goes through a registry. */
/**
* Check whether this is a "direct" input, that is, not
* one that goes through a registry.
*/
bool isDirect() const { return direct; }
/* Check whether this is a "locked" input, that is,
one that contains a commit hash or content hash. */
/**
* Check whether this is a "locked" input, that is,
* one that contains a commit hash or content hash.
*/
bool isLocked() const { return locked; }
/* Check whether the input carries all necessary info required
for cache insertion and substitution.
These fields are used to uniquely identify cached trees
within the "tarball TTL" window without necessarily
indicating that the input's origin is unchanged. */
/**
* Check whether the input carries all necessary info required
* for cache insertion and substitution.
* These fields are used to uniquely identify cached trees
* within the "tarball TTL" window without necessarily
* indicating that the input's origin is unchanged.
*/
bool hasAllInfo() const;
bool operator ==(const Input & other) const;
bool contains(const Input & other) const;
/* Fetch the input into the Nix store, returning the location in
the Nix store and the locked input. */
/**
* Fetch the input into the Nix store, returning the location in
* the Nix store and the locked input.
*/
std::pair<Tree, Input> fetch(ref<Store> store) const;
Input applyOverrides(
@ -105,7 +115,8 @@ public:
};
/* The InputScheme represents a type of fetcher. Each fetcher
/**
* The InputScheme represents a type of fetcher. Each fetcher
* registers with nix at startup time. When processing an input for a
* flake, each scheme is given an opportunity to "recognize" that
* input from the url or attributes in the flake file's specification

60
src/libmain/shared.hh
View file

@ -25,7 +25,9 @@ public:
int handleExceptions(const std::string & programName, std::function<void()> fun);
/* Don't forget to call initPlugins() after settings are initialized! */
/**
* Don't forget to call initPlugins() after settings are initialized!
*/
void initNix();
void parseCmdLine(int argc, char * * argv,
@ -36,7 +38,9 @@ void parseCmdLine(const std::string & programName, const Strings & args,
void printVersion(const std::string & programName);
/* Ugh. No better place to put this. */
/**
* Ugh. No better place to put this.
*/
void printGCWarning();
class Store;
@ -75,11 +79,15 @@ struct LegacyArgs : public MixCommonArgs
};
/* Show the manual page for the specified program. */
/**
* Show the manual page for the specified program.
*/
void showManPage(const std::string & name);
/* The constructor of this class starts a pager if stdout is a
terminal and $PAGER is set. Stdout is redirected to the pager. */
/**
* The constructor of this class starts a pager if stdout is a
* terminal and $PAGER is set. Stdout is redirected to the pager.
*/
class RunPager
{
public:
@ -110,28 +118,34 @@ struct PrintFreed
};
/* Install a SIGSEGV handler to detect stack overflows. */
/**
* Install a SIGSEGV handler to detect stack overflows.
*/
void detectStackOverflow();
/* Pluggable behavior to run in case of a stack overflow.
Default value: defaultStackOverflowHandler.
This is called by the handler installed by detectStackOverflow().
This gives Nix library consumers a limit opportunity to report the error
condition. The handler should exit the process.
See defaultStackOverflowHandler() for a reference implementation.
NOTE: Use with diligence, because this runs in the signal handler, with very
limited stack space and a potentially a corrupted heap, all while the failed
thread is blocked indefinitely. All functions called must be reentrant. */
/**
* Pluggable behavior to run in case of a stack overflow.
*
* Default value: defaultStackOverflowHandler.
*
* This is called by the handler installed by detectStackOverflow().
*
* This gives Nix library consumers a limit opportunity to report the error
* condition. The handler should exit the process.
* See defaultStackOverflowHandler() for a reference implementation.
*
* NOTE: Use with diligence, because this runs in the signal handler, with very
* limited stack space and a potentially a corrupted heap, all while the failed
* thread is blocked indefinitely. All functions called must be reentrant.
*/
extern std::function<void(siginfo_t * info, void * ctx)> stackOverflowHandler;
/* The default, robust implementation of stackOverflowHandler.
Prints an error message directly to stderr using a syscall instead of the
logger. Exits the process immediately after. */
/**
* The default, robust implementation of stackOverflowHandler.
*
* Prints an error message directly to stderr using a syscall instead of the
* logger. Exits the process immediately after.
*/
void defaultStackOverflowHandler(siginfo_t * info, void * ctx);
}

18
src/libstore/binary-cache-store.hh
View file

@ -46,6 +46,11 @@ struct BinaryCacheStoreConfig : virtual StoreConfig
)"};
};
/**
* @note subclasses must implement at least one of the two
* virtual getFile() methods.
*/
class BinaryCacheStore : public virtual BinaryCacheStoreConfig,
public virtual Store,
public virtual LogStore
@ -75,14 +80,15 @@ public:
std::string && data,
const std::string & mimeType);
/* Note: subclasses must implement at least one of the two
following getFile() methods. */
/* Dump the contents of the specified file to a sink. */
/**
* Dump the contents of the specified file to a sink.
*/
virtual void getFile(const std::string & path, Sink & sink);
/* Fetch the specified file and call the specified callback with
the result. A subclass may implement this asynchronously. */
/**
* Fetch the specified file and call the specified callback with
* the result. A subclass may implement this asynchronously.
*/
virtual void getFile(
const std::string & path,
Callback<std::optional<std::string>> callback) noexcept;

56
src/libstore/build-result.hh
View file

@ -12,9 +12,12 @@ namespace nix {
struct BuildResult
{
/* Note: don't remove status codes, and only add new status codes
at the end of the list, to prevent client/server
incompatibilities in the nix-store --serve protocol. */
/**
* @note This is directly used in the nix-store --serve protocol.
* That means we need to worry about compatability across versions.
* Therefore, don't remove status codes, and only add new status
* codes at the end of the list.
*/
enum Status {
Built = 0,
Substituted,
@ -22,8 +25,10 @@ struct BuildResult
PermanentFailure,
InputRejected,
OutputRejected,
TransientFailure, // possibly transient
CachedFailure, // no longer used
/// possibly transient
TransientFailure,
/// no longer used
CachedFailure,
TimedOut,
MiscFailure,
DependencyFailed,
@ -33,7 +38,12 @@ struct BuildResult
NoSubstituters,
} status = MiscFailure;
// FIXME: include entire ErrorInfo object.
/**
* Information about the error if the build failed.
*
* @todo This should be an entire ErrorInfo object, not just a
* string, for richer information.
*/
std::string errorMsg;
std::string toString() const {
@ -60,27 +70,39 @@ struct BuildResult
return strStatus + ((errorMsg == "") ? "" : " : " + errorMsg);
}
/* How many times this build was performed. */
/**
* How many times this build was performed.
*/
unsigned int timesBuilt = 0;
/* If timesBuilt > 1, whether some builds did not produce the same
result. (Note that 'isNonDeterministic = false' does not mean
the build is deterministic, just that we don't have evidence of
non-determinism.) */
/**
* If timesBuilt > 1, whether some builds did not produce the same
* result. (Note that 'isNonDeterministic = false' does not mean
* the build is deterministic, just that we don't have evidence of
* non-determinism.)
*/
bool isNonDeterministic = false;
/* The derivation we built or the store path we substituted. */
/**
* The derivation we built or the store path we substituted.
*/
DerivedPath path;
/* For derivations, a mapping from the names of the wanted outputs
to actual paths. */
/**
* For derivations, a mapping from the names of the wanted outputs
* to actual paths.
*/
DrvOutputs builtOutputs;
/* The start/stop times of the build (or one of the rounds, if it
was repeated). */
/**
* The start/stop times of the build (or one of the rounds, if it
* was repeated).
*/
time_t startTime = 0, stopTime = 0;
/* User and system CPU time the build took. */
/**
* User and system CPU time the build took.
*/
std::optional<std::chrono::microseconds> cpuUser, cpuSystem;
bool success()

174
src/libstore/build/derivation-goal.hh
View file

@ -16,8 +16,10 @@ struct HookInstance;
typedef enum {rpAccept, rpDecline, rpPostpone} HookReply;
/* Unless we are repairing, we don't both to test validity and just assume it,
so the choices are `Absent` or `Valid`. */
/**
* Unless we are repairing, we don't both to test validity and just assume it,
* so the choices are `Absent` or `Valid`.
*/
enum struct PathStatus {
Corrupt,
Absent,
@ -27,11 +29,15 @@ enum struct PathStatus {
struct InitialOutputStatus {
StorePath path;
PathStatus status;
/* Valid in the store, and additionally non-corrupt if we are repairing */
/**
* Valid in the store, and additionally non-corrupt if we are repairing
*/
bool isValid() const {
return status == PathStatus::Valid;
}
/* Merely present, allowed to be corrupt */
/**
* Merely present, allowed to be corrupt
*/
bool isPresent() const {
return status == PathStatus::Corrupt
|| status == PathStatus::Valid;
@ -46,59 +52,87 @@ struct InitialOutput {
struct DerivationGoal : public Goal
{
/* Whether to use an on-disk .drv file. */
/**
* Whether to use an on-disk .drv file.
*/
bool useDerivation;
/* The path of the derivation. */
/** The path of the derivation. */
StorePath drvPath;
/* The goal for the corresponding resolved derivation */
/**
* The goal for the corresponding resolved derivation
*/
std::shared_ptr<DerivationGoal> resolvedDrvGoal;
/* The specific outputs that we need to build. Empty means all of
them. */
/**
* The specific outputs that we need to build. Empty means all of
* them.
*/
OutputsSpec wantedOutputs;
/* Mapping from input derivations + output names to actual store
paths. This is filled in by waiteeDone() as each dependency
finishes, before inputsRealised() is reached, */
/**
* Mapping from input derivations + output names to actual store
* paths. This is filled in by waiteeDone() as each dependency
* finishes, before inputsRealised() is reached.
*/
std::map<std::pair<StorePath, std::string>, StorePath> inputDrvOutputs;
/* Whether additional wanted outputs have been added. */
/**
* Whether additional wanted outputs have been added.
*/
bool needRestart = false;
/* Whether to retry substituting the outputs after building the
inputs. This is done in case of an incomplete closure. */
/**
* Whether to retry substituting the outputs after building the
* inputs. This is done in case of an incomplete closure.
*/
bool retrySubstitution = false;
/* Whether we've retried substitution, in which case we won't try
again. */
/**
* Whether we've retried substitution, in which case we won't try
* again.
*/
bool retriedSubstitution = false;
/* The derivation stored at drvPath. */
/**
* The derivation stored at drvPath.
*/
std::unique_ptr<Derivation> drv;
std::unique_ptr<ParsedDerivation> parsedDrv;
/* The remainder is state held during the build. */
/**
* The remainder is state held during the build.
*/
/* Locks on (fixed) output paths. */
/**
* Locks on (fixed) output paths.
*/
PathLocks outputLocks;
/* All input paths (that is, the union of FS closures of the
immediate input paths). */
/**
* All input paths (that is, the union of FS closures of the
* immediate input paths).
*/
StorePathSet inputPaths;
std::map<std::string, InitialOutput> initialOutputs;
/* File descriptor for the log file. */
/**
* File descriptor for the log file.
*/
AutoCloseFD fdLogFile;
std::shared_ptr<BufferedSink> logFileSink, logSink;
/* Number of bytes received from the builder's stdout/stderr. */
/**
* Number of bytes received from the builder's stdout/stderr.
*/
unsigned long logSize;
/* The most recent log lines. */
/**
* The most recent log lines.
*/
std::list<std::string> logTail;
std::string currentLogLine;
@ -106,10 +140,14 @@ struct DerivationGoal : public Goal
std::string currentHookLine;
/* The build hook. */
/**
* The build hook.
*/
std::unique_ptr<HookInstance> hook;
/* The sort of derivation we are building. */
/**
* The sort of derivation we are building.
*/
DerivationType derivationType;
typedef void (DerivationGoal::*GoalState)();
@ -121,12 +159,16 @@ struct DerivationGoal : public Goal
std::unique_ptr<Activity> act;
/* Activity that denotes waiting for a lock. */
/**
* Activity that denotes waiting for a lock.
*/
std::unique_ptr<Activity> actLock;
std::map<ActivityId, Activity> builderActivities;
/* The remote machine on which we're building. */
/**
* The remote machine on which we're building.
*/
std::string machineName;
DerivationGoal(const StorePath & drvPath,
@ -143,10 +185,14 @@ struct DerivationGoal : public Goal
void work() override;
/* Add wanted outputs to an already existing derivation goal. */
/**
* Add wanted outputs to an already existing derivation goal.
*/
void addWantedOutputs(const OutputsSpec & outputs);
/* The states. */
/**
* The states.
*/
void getDerivation();
void loadDerivation();
void haveDerivation();
@ -160,28 +206,42 @@ struct DerivationGoal : public Goal
void resolvedFinished();
/* Is the build hook willing to perform the build? */
/**
* Is the build hook willing to perform the build?
*/
HookReply tryBuildHook();
virtual int getChildStatus();
/* Check that the derivation outputs all exist and register them
as valid. */
/**
* Check that the derivation outputs all exist and register them
* as valid.
*/
virtual DrvOutputs registerOutputs();
/* Open a log file and a pipe to it. */
/**
* Open a log file and a pipe to it.
*/
Path openLogFile();
/* Sign the newly built realisation if the store allows it */
/**
* Sign the newly built realisation if the store allows it
*/
virtual void signRealisation(Realisation&) {}
/* Close the log file. */
/**
* Close the log file.
*/
void closeLogFile();
/* Close the read side of the logger pipe. */
/**
* Close the read side of the logger pipe.
*/
virtual void closeReadPipes();
/* Cleanup hooks for buildDone() */
/**
* Cleanup hooks for buildDone()
*/
virtual void cleanupHookFinally();
virtual void cleanupPreChildKill();
virtual void cleanupPostChildKill();
@ -191,30 +251,40 @@ struct DerivationGoal : public Goal
virtual bool isReadDesc(int fd);
/* Callback used by the worker to write to the log. */
/**
* Callback used by the worker to write to the log.
*/
void handleChildOutput(int fd, std::string_view data) override;
void handleEOF(int fd) override;
void flushLine();
/* Wrappers around the corresponding Store methods that first consult the
derivation. This is currently needed because when there is no drv file
there also is no DB entry. */
/**
* Wrappers around the corresponding Store methods that first consult the
* derivation. This is currently needed because when there is no drv file
* there also is no DB entry.
*/
std::map<std::string, std::optional<StorePath>> queryPartialDerivationOutputMap();
OutputPathMap queryDerivationOutputMap();
/* Update 'initialOutputs' to determine the current status of the
outputs of the derivation. Also returns a Boolean denoting
whether all outputs are valid and non-corrupt, and a
'DrvOutputs' structure containing the valid and wanted
outputs. */
/**
* Update 'initialOutputs' to determine the current status of the
* outputs of the derivation. Also returns a Boolean denoting
* whether all outputs are valid and non-corrupt, and a
* 'DrvOutputs' structure containing the valid and wanted
* outputs.
*/
std::pair<bool, DrvOutputs> checkPathValidity();
/* Aborts if any output is not valid or corrupt, and otherwise
returns a 'DrvOutputs' structure containing the wanted
outputs. */
/**
* Aborts if any output is not valid or corrupt, and otherwise
* returns a 'DrvOutputs' structure containing the wanted
* outputs.
*/
DrvOutputs assertPathValidity();
/* Forcibly kill the child process, if any. */
/**
* Forcibly kill the child process, if any.
*/
virtual void killChild();
void repairClosure();

34
src/libstore/build/drv-output-substitution-goal.hh
View file

@ -11,24 +11,34 @@ namespace nix {
class Worker;
// Substitution of a derivation output.
// This is done in three steps:
// 1. Fetch the output info from a substituter
// 2. Substitute the corresponding output path
// 3. Register the output info
/**
* Substitution of a derivation output.
* This is done in three steps:
* 1. Fetch the output info from a substituter
* 2. Substitute the corresponding output path
* 3. Register the output info
*/
class DrvOutputSubstitutionGoal : public Goal {
// The drv output we're trying to substitue
/**
* The drv output we're trying to substitue
*/
DrvOutput id;
// The realisation corresponding to the given output id.
// Will be filled once we can get it.
/**
* The realisation corresponding to the given output id.
* Will be filled once we can get it.
*/
std::shared_ptr<const Realisation> outputInfo;
/* The remaining substituters. */
/**
* The remaining substituters.
*/
std::list<ref<Store>> subs;
/* The current substituter. */
/**
* The current substituter.
*/
std::shared_ptr<Store> sub;
struct DownloadState
@ -39,7 +49,9 @@ class DrvOutputSubstitutionGoal : public Goal {
std::shared_ptr<DownloadState> downloadState;
/* Whether a substituter failed. */
/**
* Whether a substituter failed.
*/
bool substituterFailed = false;
public:

70
src/libstore/build/goal.hh
View file

@ -7,11 +7,15 @@
namespace nix {
/* Forward definition. */
/**
* Forward definition.
*/
struct Goal;
class Worker;
/* A pointer to a goal. */
/**
* A pointer to a goal.
*/
typedef std::shared_ptr<Goal> GoalPtr;
typedef std::weak_ptr<Goal> WeakGoalPtr;
@ -19,48 +23,72 @@ struct CompareGoalPtrs {
bool operator() (const GoalPtr & a, const GoalPtr & b) const;
};
/* Set of goals. */
/**
* Set of goals.
*/
typedef std::set<GoalPtr, CompareGoalPtrs> Goals;
typedef std::set<WeakGoalPtr, std::owner_less<WeakGoalPtr>> WeakGoals;
/* A map of paths to goals (and the other way around). */
/**
* A map of paths to goals (and the other way around).
*/
typedef std::map<StorePath, WeakGoalPtr> WeakGoalMap;
struct Goal : public std::enable_shared_from_this<Goal>
{
typedef enum {ecBusy, ecSuccess, ecFailed, ecNoSubstituters, ecIncompleteClosure} ExitCode;
/* Backlink to the worker. */
/**
* Backlink to the worker.
*/
Worker & worker;
/* Goals that this goal is waiting for. */
/**
* Goals that this goal is waiting for.
*/
Goals waitees;
/* Goals waiting for this one to finish. Must use weak pointers
here to prevent cycles. */
/**
* Goals waiting for this one to finish. Must use weak pointers
* here to prevent cycles.
*/
WeakGoals waiters;
/* Number of goals we are/were waiting for that have failed. */
/**
* Number of goals we are/were waiting for that have failed.
*/
size_t nrFailed = 0;
/* Number of substitution goals we are/were waiting for that
failed because there are no substituters. */
/**
* Number of substitution goals we are/were waiting for that
* failed because there are no substituters.
*/
size_t nrNoSubstituters = 0;
/* Number of substitution goals we are/were waiting for that
failed because they had unsubstitutable references. */
/**
* Number of substitution goals we are/were waiting for that
* failed because they had unsubstitutable references.
*/
size_t nrIncompleteClosure = 0;
/* Name of this goal for debugging purposes. */
/**
* Name of this goal for debugging purposes.
*/
std::string name;
/* Whether the goal is finished. */
/**
* Whether the goal is finished.
*/
ExitCode exitCode = ecBusy;
/* Build result. */
/**
* Build result.
*/
BuildResult buildResult;
/* Exception containing an error message, if any. */
/**
* Exception containing an error message, if any.
*/
std::optional<Error> ex;
Goal(Worker & worker, DerivedPath path)
@ -96,9 +124,11 @@ struct Goal : public std::enable_shared_from_this<Goal>
return name;
}
/* Callback in case of a timeout. It should wake up its waiters,
get rid of any running child processes that are being monitored
by the worker (important!), etc. */
/**
* Callback in case of a timeout. It should wake up its waiters,
* get rid of any running child processes that are being monitored
* by the worker (important!), etc.
*/
virtual void timedOut(Error && ex) = 0;
virtual std::string key() = 0;

16
src/libstore/build/hook-instance.hh
View file

@ -8,16 +8,24 @@ namespace nix {
struct HookInstance
{
/* Pipes for talking to the build hook. */
/**
* Pipes for talking to the build hook.
*/
Pipe toHook;
/* Pipe for the hook's standard output/error. */
/**
* Pipe for the hook's standard output/error.
*/
Pipe fromHook;
/* Pipe for the builder's standard output/error. */
/**
* Pipe for the builder's standard output/error.
*/
Pipe builderOut;
/* The process ID of the hook. */
/**
* The process ID of the hook.
*/
Pid pid;
FdSink sink;

221
src/libstore/build/local-derivation-goal.hh
View file

@ -10,49 +10,75 @@ struct LocalDerivationGoal : public DerivationGoal
{
LocalStore & getLocalStore();
/* User selected for running the builder. */
/**
* User selected for running the builder.
*/
std::unique_ptr<UserLock> buildUser;
/* The process ID of the builder. */
/**
* The process ID of the builder.
*/
Pid pid;
/* The cgroup of the builder, if any. */
/**
* The cgroup of the builder, if any.
*/
std::optional<Path> cgroup;
/* The temporary directory. */
/**
* The temporary directory.
*/
Path tmpDir;
/* The path of the temporary directory in the sandbox. */
/**
* The path of the temporary directory in the sandbox.
*/
Path tmpDirInSandbox;
/* Master side of the pseudoterminal used for the builder's
standard output/error. */
/**
* Master side of the pseudoterminal used for the builder's
* standard output/error.
*/
AutoCloseFD builderOut;
/* Pipe for synchronising updates to the builder namespaces. */
/**
* Pipe for synchronising updates to the builder namespaces.
*/
Pipe userNamespaceSync;
/* The mount namespace and user namespace of the builder, used to add additional
paths to the sandbox as a result of recursive Nix calls. */
/**
* The mount namespace and user namespace of the builder, used to add additional
* paths to the sandbox as a result of recursive Nix calls.
*/
AutoCloseFD sandboxMountNamespace;
AutoCloseFD sandboxUserNamespace;
/* On Linux, whether we're doing the build in its own user
namespace. */
/**
* On Linux, whether we're doing the build in its own user
* namespace.
*/
bool usingUserNamespace = true;
/* Whether we're currently doing a chroot build. */
/**
* Whether we're currently doing a chroot build.
*/
bool useChroot = false;
Path chrootRootDir;
/* RAII object to delete the chroot directory. */
/**
* RAII object to delete the chroot directory.
*/
std::shared_ptr<AutoDelete> autoDelChroot;
/* Whether to run the build in a private network namespace. */
/**
* Whether to run the build in a private network namespace.
*/
bool privateNetwork = false;
/* Stuff we need to pass to initChild(). */
/**
* Stuff we need to pass to initChild().
*/
struct ChrootPath {
Path source;
bool optional;
@ -71,30 +97,35 @@ struct LocalDerivationGoal : public DerivationGoal
SandboxProfile additionalSandboxProfile;
#endif
/* Hash rewriting. */
/**
* Hash rewriting.
*/
StringMap inputRewrites, outputRewrites;
typedef map<StorePath, StorePath> RedirectedOutputs;
RedirectedOutputs redirectedOutputs;
/* The outputs paths used during the build.
- Input-addressed derivations or fixed content-addressed outputs are
sometimes built when some of their outputs already exist, and can not
be hidden via sandboxing. We use temporary locations instead and
rewrite after the build. Otherwise the regular predetermined paths are
put here.
- Floating content-addressed derivations do not know their final build
output paths until the outputs are hashed, so random locations are
used, and then renamed. The randomness helps guard against hidden
self-references.
/**
* The outputs paths used during the build.
*
* - Input-addressed derivations or fixed content-addressed outputs are
* sometimes built when some of their outputs already exist, and can not
* be hidden via sandboxing. We use temporary locations instead and
* rewrite after the build. Otherwise the regular predetermined paths are
* put here.
*
* - Floating content-addressed derivations do not know their final build
* output paths until the outputs are hashed, so random locations are
* used, and then renamed. The randomness helps guard against hidden
* self-references.
*/
OutputPathMap scratchOutputs;
/* Path registration info from the previous round, if we're
building multiple times. Since this contains the hash, it
allows us to compare whether two rounds produced the same
result. */
/**
* Path registration info from the previous round, if we're
* building multiple times. Since this contains the hash, it
* allows us to compare whether two rounds produced the same
* result.
*/
std::map<Path, ValidPathInfo> prevInfos;
uid_t sandboxUid() { return usingUserNamespace ? (!buildUser || buildUser->getUIDCount() == 1 ? 1000 : 0) : buildUser->getUID(); }
@ -102,25 +133,37 @@ struct LocalDerivationGoal : public DerivationGoal
const static Path homeDir;
/* The recursive Nix daemon socket. */
/**
* The recursive Nix daemon socket.
*/
AutoCloseFD daemonSocket;
/* The daemon main thread. */
/**
* The daemon main thread.
*/
std::thread daemonThread;
/* The daemon worker threads. */
/**
* The daemon worker threads.
*/
std::vector<std::thread> daemonWorkerThreads;
/* Paths that were added via recursive Nix calls. */
/**
* Paths that were added via recursive Nix calls.
*/
StorePathSet addedPaths;
/* Realisations that were added via recursive Nix calls. */
/**
* Realisations that were added via recursive Nix calls.
*/
std::set<DrvOutput> addedDrvOutputs;
/* Recursive Nix calls are only allowed to build or realize paths
in the original input closure or added via a recursive Nix call
(so e.g. you can't do 'nix-store -r /nix/store/<bla>' where
/nix/store/<bla> is some arbitrary path in a binary cache). */
/**
* Recursive Nix calls are only allowed to build or realize paths
* in the original input closure or added via a recursive Nix call
* (so e.g. you can't do 'nix-store -r /nix/store/<bla>' where
* /nix/store/<bla> is some arbitrary path in a binary cache).
*/
bool isAllowed(const StorePath & path)
{
return inputPaths.count(path) || addedPaths.count(path);
@ -138,55 +181,81 @@ struct LocalDerivationGoal : public DerivationGoal
virtual ~LocalDerivationGoal() override;
/* Whether we need to perform hash rewriting if there are valid output paths. */
/**
* Whether we need to perform hash rewriting if there are valid output paths.
*/
bool needsHashRewrite();
/* The additional states. */
/**
* The additional states.
*/
void tryLocalBuild() override;
/* Start building a derivation. */
/**
* Start building a derivation.
*/
void startBuilder();
/* Fill in the environment for the builder. */
/**
* Fill in the environment for the builder.
*/
void initEnv();
/* Setup tmp dir location. */
/**
* Setup tmp dir location.
*/
void initTmpDir();
/* Write a JSON file containing the derivation attributes. */
/**
* Write a JSON file containing the derivation attributes.
*/
void writeStructuredAttrs();
void startDaemon();
void stopDaemon();
/* Add 'path' to the set of paths that may be referenced by the
outputs, and make it appear in the sandbox. */
/**
* Add 'path' to the set of paths that may be referenced by the
* outputs, and make it appear in the sandbox.
*/
void addDependency(const StorePath & path);
/* Make a file owned by the builder. */
/**
* Make a file owned by the builder.
*/
void chownToBuilder(const Path & path);
int getChildStatus() override;
/* Run the builder's process. */
/**
* Run the builder's process.
*/
void runChild();
/* Check that the derivation outputs all exist and register them
as valid. */
/**
* Check that the derivation outputs all exist and register them
* as valid.
*/
DrvOutputs registerOutputs() override;
void signRealisation(Realisation &) override;
/* Check that an output meets the requirements specified by the
'outputChecks' attribute (or the legacy
'{allowed,disallowed}{References,Requisites}' attributes). */
/**
* Check that an output meets the requirements specified by the
* 'outputChecks' attribute (or the legacy
* '{allowed,disallowed}{References,Requisites}' attributes).
*/
void checkOutputs(const std::map<std::string, ValidPathInfo> & outputs);
/* Close the read side of the logger pipe. */
/**
* Close the read side of the logger pipe.
*/
void closeReadPipes() override;
/* Cleanup hooks for buildDone() */
/**
* Cleanup hooks for buildDone()
*/
void cleanupHookFinally() override;
void cleanupPreChildKill() override;
void cleanupPostChildKill() override;
@ -196,24 +265,36 @@ struct LocalDerivationGoal : public DerivationGoal
bool isReadDesc(int fd) override;
/* Delete the temporary directory, if we have one. */
/**
* Delete the temporary directory, if we have one.
*/
void deleteTmpDir(bool force);
/* Forcibly kill the child process, if any. */
/**
* Forcibly kill the child process, if any.
*/
void killChild() override;
/* Kill any processes running under the build user UID or in the
cgroup of the build. */
/**
* Kill any processes running under the build user UID or in the
* cgroup of the build.
*/
void killSandbox(bool getStats);
/* Create alternative path calculated from but distinct from the
input, so we can avoid overwriting outputs (or other store paths)
that already exist. */
/**
* Create alternative path calculated from but distinct from the
* input, so we can avoid overwriting outputs (or other store paths)
* that already exist.
*/
StorePath makeFallbackPath(const StorePath & path);
/* Make a path to another based on the output name along with the
derivation hash. */
/* FIXME add option to randomize, so we can audit whether our
rewrites caught everything */
/**
* Make a path to another based on the output name along with the
* derivation hash.
*
* @todo Add option to randomize, so we can audit whether our
* rewrites caught everything
*/
StorePath makeFallbackPath(std::string_view outputName);
};

62
src/libstore/build/substitution-goal.hh
View file

@ -11,38 +11,58 @@ class Worker;
struct PathSubstitutionGoal : public Goal
{
/* The store path that should be realised through a substitute. */
/**
* The store path that should be realised through a substitute.
*/
StorePath storePath;
/* The path the substituter refers to the path as. This will be
different when the stores have different names. */
/**
* The path the substituter refers to the path as. This will be
* different when the stores have different names.
*/
std::optional<StorePath> subPath;
/* The remaining substituters. */
/**
* The remaining substituters.
*/
std::list<ref<Store>> subs;
/* The current substituter. */
/**
* The current substituter.
*/
std::shared_ptr<Store> sub;
/* Whether a substituter failed. */
/**
* Whether a substituter failed.
*/
bool substituterFailed = false;
/* Path info returned by the substituter's query info operation. */
/**
* Path info returned by the substituter's query info operation.
*/
std::shared_ptr<const ValidPathInfo> info;
/* Pipe for the substituter's standard output. */
/**
* Pipe for the substituter's standard output.
*/
Pipe outPipe;
/* The substituter thread. */
/**
* The substituter thread.
*/
std::thread thr;
std::promise<void> promise;
/* Whether to try to repair a valid path. */
/**
* Whether to try to repair a valid path.
*/
RepairFlag repair;
/* Location where we're downloading the substitute. Differs from
storePath when doing a repair. */
/**
* Location where we're downloading the substitute. Differs from
* storePath when doing a repair.
*/
Path destPath;
std::unique_ptr<MaintainCount<uint64_t>> maintainExpectedSubstitutions,
@ -51,7 +71,9 @@ struct PathSubstitutionGoal : public Goal
typedef void (PathSubstitutionGoal::*GoalState)();
GoalState state;
/* Content address for recomputing store path */
/**
* Content address for recomputing store path
*/
std::optional<ContentAddress> ca;
void done(
@ -65,16 +87,20 @@ public:
void timedOut(Error && ex) override { abort(); };
/**
* We prepend "a$" to the key name to ensure substitution goals
* happen before derivation goals.
*/
std::string key() override
{
/* "a$" ensures substitution goals happen before derivation
goals. */
return "a$" + std::string(storePath.name()) + "$" + worker.store.printStorePath(storePath);
}
void work() override;
/* The states. */
/**
* The states.
*/
void init();
void tryNext();
void gotInfo();
@ -82,7 +108,9 @@ public:
void tryToRun();
void finished();
/* Callback used by the worker to write to the log. */
/**
* Callback used by the worker to write to the log.
*/
void handleChildOutput(int fd, std::string_view data) override;
void handleEOF(int fd) override;

186
src/libstore/build/worker.hh
View file

@ -17,24 +17,29 @@ struct DerivationGoal;
struct PathSubstitutionGoal;
class DrvOutputSubstitutionGoal;
/* Workaround for not being able to declare a something like
class PathSubstitutionGoal : public Goal;
even when Goal is a complete type.
This is still a static cast. The purpose of exporting it is to define it in
a place where `PathSubstitutionGoal` is concrete, and use it in a place where it
is opaque. */
/**
* Workaround for not being able to declare a something like
*
* ```c++
* class PathSubstitutionGoal : public Goal;
* ```
* even when Goal is a complete type.
*
* This is still a static cast. The purpose of exporting it is to define it in
* a place where `PathSubstitutionGoal` is concrete, and use it in a place where it
* is opaque.
*/
GoalPtr upcast_goal(std::shared_ptr<PathSubstitutionGoal> subGoal);
GoalPtr upcast_goal(std::shared_ptr<DrvOutputSubstitutionGoal> subGoal);
typedef std::chrono::time_point<std::chrono::steady_clock> steady_time_point;
/* A mapping used to remember for each child process to what goal it
belongs, and file descriptors for receiving log data and output
path creation commands. */
/**
* A mapping used to remember for each child process to what goal it
* belongs, and file descriptors for receiving log data and output
* path creation commands.
*/
struct Child
{
WeakGoalPtr goal;
@ -42,14 +47,19 @@ struct Child
std::set<int> fds;
bool respectTimeouts;
bool inBuildSlot;
steady_time_point lastOutput; /* time we last got output on stdout/stderr */
/**
* Time we last got output on stdout/stderr
*/
steady_time_point lastOutput;
steady_time_point timeStarted;
};
/* Forward definition. */
struct HookInstance;
/* The worker class. */
/**
* The worker class.
*/
class Worker
{
private:
@ -57,38 +67,58 @@ private:
/* Note: the worker should only have strong pointers to the
top-level goals. */
/* The top-level goals of the worker. */
/**
* The top-level goals of the worker.
*/
Goals topGoals;
/* Goals that are ready to do some work. */
/**
* Goals that are ready to do some work.
*/
WeakGoals awake;
/* Goals waiting for a build slot. */
/**
* Goals waiting for a build slot.
*/
WeakGoals wantingToBuild;
/* Child processes currently running. */
/**
* Child processes currently running.
*/
std::list<Child> children;
/* Number of build slots occupied. This includes local builds and
substitutions but not remote builds via the build hook. */
/**
* Number of build slots occupied. This includes local builds and
* substitutions but not remote builds via the build hook.
*/
unsigned int nrLocalBuilds;
/* Maps used to prevent multiple instantiations of a goal for the
same derivation / path. */
/**
* Maps used to prevent multiple instantiations of a goal for the
* same derivation / path.
*/
std::map<StorePath, std::weak_ptr<DerivationGoal>> derivationGoals;
std::map<StorePath, std::weak_ptr<PathSubstitutionGoal>> substitutionGoals;
std::map<DrvOutput, std::weak_ptr<DrvOutputSubstitutionGoal>> drvOutputSubstitutionGoals;
/* Goals waiting for busy paths to be unlocked. */
/**
* Goals waiting for busy paths to be unlocked.
*/
WeakGoals waitingForAnyGoal;
/* Goals sleeping for a few seconds (polling a lock). */
/**
* Goals sleeping for a few seconds (polling a lock).
*/
WeakGoals waitingForAWhile;
/* Last time the goals in `waitingForAWhile' where woken up. */
/**
* Last time the goals in `waitingForAWhile` where woken up.
*/
steady_time_point lastWokenUp;
/* Cache for pathContentsGood(). */
/**
* Cache for pathContentsGood().
*/
std::map<StorePath, bool> pathContentsGoodCache;
public:
@ -97,17 +127,25 @@ public:
const Activity actDerivations;
const Activity actSubstitutions;
/* Set if at least one derivation had a BuildError (i.e. permanent
failure). */
/**
* Set if at least one derivation had a BuildError (i.e. permanent
* failure).
*/
bool permanentFailure;
/* Set if at least one derivation had a timeout. */
/**
* Set if at least one derivation had a timeout.
*/
bool timedOut;
/* Set if at least one derivation fails with a hash mismatch. */
/**
* Set if at least one derivation fails with a hash mismatch.
*/
bool hashMismatch;
/* Set if at least one derivation is not deterministic in check mode. */
/**
* Set if at least one derivation is not deterministic in check mode.
*/
bool checkMismatch;
Store & store;
@ -129,16 +167,22 @@ public:
uint64_t expectedNarSize = 0;
uint64_t doneNarSize = 0;
/* Whether to ask the build hook if it can build a derivation. If
it answers with "decline-permanently", we don't try again. */
/**
* Whether to ask the build hook if it can build a derivation. If
* it answers with "decline-permanently", we don't try again.
*/
bool tryBuildHook = true;
Worker(Store & store, Store & evalStore);
~Worker();
/* Make a goal (with caching). */
/**
* Make a goal (with caching).
*/
/* derivation goal */
/**
* derivation goal
*/
private:
std::shared_ptr<DerivationGoal> makeDerivationGoalCommon(
const StorePath & drvPath, const OutputsSpec & wantedOutputs,
@ -151,56 +195,80 @@ public:
const StorePath & drvPath, const BasicDerivation & drv,
const OutputsSpec & wantedOutputs, BuildMode buildMode = bmNormal);
/* substitution goal */
/**
* substitution goal
*/
std::shared_ptr<PathSubstitutionGoal> makePathSubstitutionGoal(const StorePath & storePath, RepairFlag repair = NoRepair, std::optional<ContentAddress> ca = std::nullopt);
std::shared_ptr<DrvOutputSubstitutionGoal> makeDrvOutputSubstitutionGoal(const DrvOutput & id, RepairFlag repair = NoRepair, std::optional<ContentAddress> ca = std::nullopt);
/* Remove a dead goal. */
/**
* Remove a dead goal.
*/
void removeGoal(GoalPtr goal);
/* Wake up a goal (i.e., there is something for it to do). */
/**
* Wake up a goal (i.e., there is something for it to do).
*/
void wakeUp(GoalPtr goal);
/* Return the number of local build and substitution processes
currently running (but not remote builds via the build
hook). */
/**
* Return the number of local build and substitution processes
* currently running (but not remote builds via the build
* hook).
*/
unsigned int getNrLocalBuilds();
/* Registers a running child process. `inBuildSlot' means that
the process counts towards the jobs limit. */
/**
* Registers a running child process. `inBuildSlot` means that
* the process counts towards the jobs limit.
*/
void childStarted(GoalPtr goal, const std::set<int> & fds,
bool inBuildSlot, bool respectTimeouts);
/* Unregisters a running child process. `wakeSleepers' should be
false if there is no sense in waking up goals that are sleeping
because they can't run yet (e.g., there is no free build slot,
or the hook would still say `postpone'). */
/**
* Unregisters a running child process. `wakeSleepers` should be
* false if there is no sense in waking up goals that are sleeping
* because they can't run yet (e.g., there is no free build slot,
* or the hook would still say `postpone`).
*/
void childTerminated(Goal * goal, bool wakeSleepers = true);
/* Put `goal' to sleep until a build slot becomes available (which
might be right away). */
/**
* Put `goal` to sleep until a build slot becomes available (which
* might be right away).
*/
void waitForBuildSlot(GoalPtr goal);
/* Wait for any goal to finish. Pretty indiscriminate way to
wait for some resource that some other goal is holding. */
/**
* Wait for any goal to finish. Pretty indiscriminate way to
* wait for some resource that some other goal is holding.
*/
void waitForAnyGoal(GoalPtr goal);
/* Wait for a few seconds and then retry this goal. Used when
waiting for a lock held by another process. This kind of
polling is inefficient, but POSIX doesn't really provide a way
to wait for multiple locks in the main select() loop. */
/**
* Wait for a few seconds and then retry this goal. Used when
* waiting for a lock held by another process. This kind of
* polling is inefficient, but POSIX doesn't really provide a way
* to wait for multiple locks in the main select() loop.
*/
void waitForAWhile(GoalPtr goal);
/* Loop until the specified top-level goals have finished. */
/**
* Loop until the specified top-level goals have finished.
*/
void run(const Goals & topGoals);
/* Wait for input to become available. */
/**
* Wait for input to become available.
*/
void waitForInput();
unsigned int exitStatus();
/* Check whether the given valid path exists and has the right
contents. */
/**
* Check whether the given valid path exists and has the right
* contents.
*/
bool pathContentsGood(const StorePath & path);
void markContentsGood(const StorePath & path);

16
src/libstore/crypto.hh
View file

@ -12,8 +12,10 @@ struct Key
std::string name;
std::string key;
/* Construct Key from a string in the format
‘<name>:<key-in-base64>’. */
/**
* Construct Key from a string in the format
* ‘<name>:<key-in-base64>’.
*/
Key(std::string_view s);
std::string to_string() const;
@ -29,7 +31,9 @@ struct SecretKey : Key
{
SecretKey(std::string_view s);
/* Return a detached signature of the given string. */
/**
* Return a detached signature of the given string.
*/
std::string signDetached(std::string_view s) const;
PublicKey toPublicKey() const;
@ -53,8 +57,10 @@ private:
typedef std::map<std::string, PublicKey> PublicKeys;
/* Return true iff ‘sig’ is a correct signature over ‘data’ using one
of the given public keys. */
/**
* @return true iff ‘sig’ is a correct signature over ‘data’ using one
* of the given public keys.
*/
bool verifyDetached(const std::string & data, const std::string & sig,
const PublicKeys & publicKeys);

16
src/libstore/derivations.hh
View file

@ -258,8 +258,14 @@ struct DerivationType : _DerivationTypeRaw {
struct BasicDerivation
{
DerivationOutputs outputs; /* keyed on symbolic IDs */
StorePathSet inputSrcs; /* inputs that are sources */
/**
* keyed on symbolic IDs
*/
DerivationOutputs outputs;
/**
* inputs that are sources
*/
StorePathSet inputSrcs;
std::string platform;
Path builder;
Strings args;
@ -429,12 +435,12 @@ void operator |= (DrvHash::Kind & self, const DrvHash::Kind & other) noexcept;
*
* A fixed-output derivation is a derivation whose outputs have a
* specified content hash and hash algorithm. (Currently they must have
* exactly one output (`out'), which is specified using the `outputHash'
* and `outputHashAlgo' attributes, but the algorithm doesn't assume
* exactly one output (`out`), which is specified using the `outputHash`
* and `outputHashAlgo` attributes, but the algorithm doesn't assume
* this.) We don't want changes to such derivations to propagate upwards
* through the dependency graph, changing output paths everywhere.
*
* For instance, if we change the url in a call to the `fetchurl'
* For instance, if we change the url in a call to the `fetchurl`
* function, we do not want to rebuild everything depending on it---after
* all, (the hash of) the file being downloaded is unchanged. So the
* *output paths* should not change. On the other hand, the *derivation

17
src/libstore/fs-accessor.hh
View file

@ -5,8 +5,10 @@
namespace nix {
/* An abstract class for accessing a filesystem-like structure, such
as a (possibly remote) Nix store or the contents of a NAR file. */
/**
* An abstract class for accessing a filesystem-like structure, such
* as a (possibly remote) Nix store or the contents of a NAR file.
*/
class FSAccessor
{
public:
@ -15,8 +17,17 @@ public:
struct Stat
{
Type type = tMissing;
uint64_t fileSize = 0; // regular files only
/**
* regular files only
*/
uint64_t fileSize = 0;
/**
* regular files only
*/
bool isExecutable = false; // regular files only
/**
* regular files only
*/
uint64_t narOffset = 0; // regular files only
};

83
src/libstore/gc-store.hh
View file

@ -12,18 +12,19 @@ typedef std::unordered_map<StorePath, std::unordered_set<std::string>> Roots;
struct GCOptions
{
/* Garbage collector operation:
- `gcReturnLive': return the set of paths reachable from
(i.e. in the closure of) the roots.
- `gcReturnDead': return the set of paths not reachable from
the roots.
- `gcDeleteDead': actually delete the latter set.
- `gcDeleteSpecific': delete the paths listed in
`pathsToDelete', insofar as they are not reachable.
/**
* Garbage collector operation:
*
* - `gcReturnLive`: return the set of paths reachable from
* (i.e. in the closure of) the roots.
*
* - `gcReturnDead`: return the set of paths not reachable from
* the roots.
*
* - `gcDeleteDead`: actually delete the latter set.
*
* - `gcDeleteSpecific`: delete the paths listed in
* `pathsToDelete`, insofar as they are not reachable.
*/
typedef enum {
gcReturnLive,
@ -34,28 +35,38 @@ struct GCOptions
GCAction action{gcDeleteDead};
/* If `ignoreLiveness' is set, then reachability from the roots is
ignored (dangerous!). However, the paths must still be
unreferenced *within* the store (i.e., there can be no other
store paths that depend on them). */
/**
* If `ignoreLiveness` is set, then reachability from the roots is
* ignored (dangerous!). However, the paths must still be
* unreferenced *within* the store (i.e., there can be no other
* store paths that depend on them).
*/
bool ignoreLiveness{false};
/* For `gcDeleteSpecific', the paths to delete. */
/**
* For `gcDeleteSpecific`, the paths to delete.
*/
StorePathSet pathsToDelete;
/* Stop after at least `maxFreed' bytes have been freed. */
/**
* Stop after at least `maxFreed` bytes have been freed.
*/
uint64_t maxFreed{std::numeric_limits<uint64_t>::max()};
};
struct GCResults
{
/* Depending on the action, the GC roots, or the paths that would
be or have been deleted. */
/**
* Depending on the action, the GC roots, or the paths that would
* be or have been deleted.
*/
PathSet paths;
/* For `gcReturnDead', `gcDeleteDead' and `gcDeleteSpecific', the
number of bytes that would be or was freed. */
/**
* For `gcReturnDead`, `gcDeleteDead` and `gcDeleteSpecific`, the
* number of bytes that would be or was freed.
*/
uint64_t bytesFreed = 0;
};
@ -64,21 +75,27 @@ struct GcStore : public virtual Store
{
inline static std::string operationName = "Garbage collection";
/* Add an indirect root, which is merely a symlink to `path' from
/nix/var/nix/gcroots/auto/<hash of `path'>. `path' is supposed
to be a symlink to a store path. The garbage collector will
automatically remove the indirect root when it finds that
`path' has disappeared. */
/**
* Add an indirect root, which is merely a symlink to `path` from
* `/nix/var/nix/gcroots/auto/<hash of path>`. `path` is supposed
* to be a symlink to a store path. The garbage collector will
* automatically remove the indirect root when it finds that
* `path` has disappeared.
*/
virtual void addIndirectRoot(const Path & path) = 0;
/* Find the roots of the garbage collector. Each root is a pair
(link, storepath) where `link' is the path of the symlink
outside of the Nix store that point to `storePath'. If
'censor' is true, privacy-sensitive information about roots
found in /proc is censored. */
/**
* Find the roots of the garbage collector. Each root is a pair
* `(link, storepath)` where `link` is the path of the symlink
* outside of the Nix store that point to `storePath`. If
* `censor` is true, privacy-sensitive information about roots
* found in `/proc` is censored.
*/
virtual Roots findRoots(bool censor) = 0;
/* Perform a garbage collection. */
/**
* Perform a garbage collection.
*/
virtual void collectGarbage(const GCOptions & options, GCResults & results) = 0;
};

64
src/libstore/globals.hh
View file

@ -72,30 +72,46 @@ public:
Path nixPrefix;
/* The directory where we store sources and derived files. */
/**
* The directory where we store sources and derived files.
*/
Path nixStore;
Path nixDataDir; /* !!! fix */
/* The directory where we log various operations. */
/**
* The directory where we log various operations.
*/
Path nixLogDir;
/* The directory where state is stored. */
/**
* The directory where state is stored.
*/
Path nixStateDir;
/* The directory where system configuration files are stored. */
/**
* The directory where system configuration files are stored.
*/
Path nixConfDir;
/* A list of user configuration files to load. */
/**
* A list of user configuration files to load.
*/
std::vector<Path> nixUserConfFiles;
/* The directory where the main programs are stored. */
/**
* The directory where the main programs are stored.
*/
Path nixBinDir;
/* The directory where the man pages are stored. */
/**
* The directory where the man pages are stored.
*/
Path nixManDir;
/* File name of the socket the daemon listens to. */
/**
* File name of the socket the daemon listens to.
*/
Path nixDaemonSocketFile;
Setting<std::string> storeUri{this, getEnv("NIX_REMOTE").value_or("auto"), "store",
@ -121,7 +137,9 @@ public:
)",
{"build-fallback"}};
/* Whether to show build log output in real time. */
/**
* Whether to show build log output in real time.
*/
bool verboseBuild = true;
Setting<size_t> logLines{this, 10, "log-lines",
@ -157,8 +175,10 @@ public:
)",
{"build-cores"}, false};
/* Read-only mode. Don't copy stuff to the store, don't change
the database. */
/**
* Read-only mode. Don't copy stuff to the store, don't change
* the database.
*/
bool readOnlyMode = false;
Setting<std::string> thisSystem{
@ -458,7 +478,9 @@ public:
)",
{"env-keep-derivations"}};
/* Whether to lock the Nix client and worker to the same CPU. */
/**
* Whether to lock the Nix client and worker to the same CPU.
*/
bool lockCPU;
Setting<SandboxMode> sandboxMode{
@ -997,8 +1019,10 @@ public:
// FIXME: don't use a global variable.
extern Settings settings;
/* This should be called after settings are initialized, but before
anything else */
/**
* This should be called after settings are initialized, but before
* anything else
*/
void initPlugins();
void loadConfFile();
@ -1008,12 +1032,16 @@ std::vector<Path> getUserConfigFiles();
extern const std::string nixVersion;
/* NB: This is not sufficient. You need to call initNix() */
/**
* NB: This is not sufficient. You need to call initNix()
*/
void initLibStore();
/* It's important to initialize before doing _anything_, which is why we
call upon the programmer to handle this correctly. However, we only add
this in a key locations, so as not to litter the code. */
/**
* It's important to initialize before doing _anything_, which is why we
* call upon the programmer to handle this correctly. However, we only add
* this in a key locations, so as not to litter the code.
*/
void assertLibStoreInitialized();
}

4
src/libstore/local-fs-store.hh
View file

@ -48,7 +48,9 @@ public:
void narFromPath(const StorePath & path, Sink & sink) override;
ref<FSAccessor> getFSAccessor() override;
/* Register a permanent GC root. */
/**
* Register a permanent GC root.
*/
Path addPermRoot(const StorePath & storePath, const Path & gcRoot);
virtual Path getRealStoreDir() { return realStoreDir; }

145
src/libstore/local-store.hh
View file

@ -19,10 +19,14 @@
namespace nix {
/* Nix store and database schema version. Version 1 (or 0) was Nix <=
0.7. Version 2 was Nix 0.8 and 0.9. Version 3 is Nix 0.10.
Version 4 is Nix 0.11. Version 5 is Nix 0.12-0.16. Version 6 is
Nix 1.0. Version 7 is Nix 1.3. Version 10 is 2.0. */
/**
* Nix store and database schema version.
*
* Version 1 (or 0) was Nix <=
* 0.7. Version 2 was Nix 0.8 and 0.9. Version 3 is Nix 0.10.
* Version 4 is Nix 0.11. Version 5 is Nix 0.12-0.16. Version 6 is
* Nix 1.0. Version 7 is Nix 1.3. Version 10 is 2.0.
*/
const int nixSchemaVersion = 10;
@ -51,30 +55,40 @@ class LocalStore : public virtual LocalStoreConfig, public virtual LocalFSStore,
{
private:
/* Lock file used for upgrading. */
/**
* Lock file used for upgrading.
*/
AutoCloseFD globalLock;
struct State
{
/* The SQLite database object. */
/**
* The SQLite database object.
*/
SQLite db;
struct Stmts;
std::unique_ptr<Stmts> stmts;
/* The last time we checked whether to do an auto-GC, or an
auto-GC finished. */
/**
* The last time we checked whether to do an auto-GC, or an
* auto-GC finished.
*/
std::chrono::time_point<std::chrono::steady_clock> lastGCCheck;
/* Whether auto-GC is running. If so, get gcFuture to wait for
the GC to finish. */
/**
* Whether auto-GC is running. If so, get gcFuture to wait for
* the GC to finish.
*/
bool gcRunning = false;
std::shared_future<void> gcFuture;
/* How much disk space was available after the previous
auto-GC. If the current available disk space is below
minFree but not much below availAfterGC, then there is no
point in starting a new GC. */
/**
* How much disk space was available after the previous
* auto-GC. If the current available disk space is below
* minFree but not much below availAfterGC, then there is no
* point in starting a new GC.
*/
uint64_t availAfterGC = std::numeric_limits<uint64_t>::max();
std::unique_ptr<PublicKeys> publicKeys;
@ -97,11 +111,15 @@ private:
public:
// Hack for build-remote.cc.
/**
* Hack for build-remote.cc.
*/
PathSet locksHeld;
/* Initialise the local store, upgrading the schema if
necessary. */
/**
* Initialise the local store, upgrading the schema if
* necessary.
*/
LocalStore(const Params & params);
LocalStore(std::string scheme, std::string path, const Params & params);
@ -110,7 +128,9 @@ public:
static std::set<std::string> uriSchemes()
{ return {}; }
/* Implementations of abstract store API methods. */
/**
* Implementations of abstract store API methods.
*/
std::string getUri() override;
@ -155,13 +175,19 @@ private:
void createTempRootsFile();
/* The file to which we write our temporary roots. */
/**
* The file to which we write our temporary roots.
*/
Sync<AutoCloseFD> _fdTempRoots;
/* The global GC lock. */
/**
* The global GC lock.
*/
Sync<AutoCloseFD> _fdGCLock;
/* Connection to the garbage collector. */
/**
* Connection to the garbage collector.
*/
Sync<AutoCloseFD> _fdRootsSocket;
public:
@ -180,24 +206,30 @@ public:
void collectGarbage(const GCOptions & options, GCResults & results) override;
/* Optimise the disk space usage of the Nix store by hard-linking
files with the same contents. */
/**
* Optimise the disk space usage of the Nix store by hard-linking
* files with the same contents.
*/
void optimiseStore(OptimiseStats & stats);
void optimiseStore() override;
/* Optimise a single store path. Optionally, test the encountered
symlinks for corruption. */
/**
* Optimise a single store path. Optionally, test the encountered
* symlinks for corruption.
*/
void optimisePath(const Path & path, RepairFlag repair);
bool verifyStore(bool checkContents, RepairFlag repair) override;
/* Register the validity of a path, i.e., that `path' exists, that
the paths referenced by it exists, and in the case of an output
path of a derivation, that it has been produced by a successful
execution of the derivation (or something equivalent). Also
register the hash of the file system contents of the path. The
hash must be a SHA-256 hash. */
/**
* Register the validity of a path, i.e., that `path` exists, that
* the paths referenced by it exists, and in the case of an output
* path of a derivation, that it has been produced by a successful
* execution of the derivation (or something equivalent). Also
* register the hash of the file system contents of the path. The
* hash must be a SHA-256 hash.
*/
void registerValidPath(const ValidPathInfo & info);
void registerValidPaths(const ValidPathInfos & infos);
@ -212,12 +244,16 @@ public:
void addSignatures(const StorePath & storePath, const StringSet & sigs) override;
/* If free disk space in /nix/store if below minFree, delete
garbage until it exceeds maxFree. */
/**
* If free disk space in /nix/store if below minFree, delete
* garbage until it exceeds maxFree.
*/
void autoGC(bool sync = true);
/* Register the store path 'output' as the output named 'outputName' of
derivation 'deriver'. */
/**
* Register the store path 'output' as the output named 'outputName' of
* derivation 'deriver'.
*/
void registerDrvOutput(const Realisation & info) override;
void registerDrvOutput(const Realisation & info, CheckSigsFlag checkSigs) override;
void cacheDrvOutputMapping(
@ -247,7 +283,9 @@ private:
void invalidatePath(State & state, const StorePath & path);
/* Delete a path from the Nix store. */
/**
* Delete a path from the Nix store.
*/
void invalidatePathChecked(const StorePath & path);
void verifyPath(const Path & path, const StringSet & store,
@ -280,8 +318,10 @@ private:
bool isValidPath_(State & state, const StorePath & path);
void queryReferrers(State & state, const StorePath & path, StorePathSet & referrers);
/* Add signatures to a ValidPathInfo or Realisation using the secret keys
specified by the ‘secret-key-files’ option. */
/**
* Add signatures to a ValidPathInfo or Realisation using the secret keys
* specified by the ‘secret-key-files’ option.
*/
void signPathInfo(ValidPathInfo & info);
void signRealisation(Realisation &);
@ -311,18 +351,23 @@ typedef std::pair<dev_t, ino_t> Inode;
typedef std::set<Inode> InodesSeen;
/* "Fix", or canonicalise, the meta-data of the files in a store path
after it has been built. In particular:
- the last modification date on each file is set to 1 (i.e.,
00:00:01 1/1/1970 UTC)
- the permissions are set of 444 or 555 (i.e., read-only with or
without execute permission; setuid bits etc. are cleared)
- the owner and group are set to the Nix user and group, if we're
running as root.
If uidRange is not empty, this function will throw an error if it
encounters files owned by a user outside of the closed interval
[uidRange->first, uidRange->second].
*/
/**
* "Fix", or canonicalise, the meta-data of the files in a store path
* after it has been built. In particular:
*
* - the last modification date on each file is set to 1 (i.e.,
* 00:00:01 1/1/1970 UTC)
*
* - the permissions are set of 444 or 555 (i.e., read-only with or
* without execute permission; setuid bits etc. are cleared)
*
* - the owner and group are set to the Nix user and group, if we're
* running as root.
*
* If uidRange is not empty, this function will throw an error if it
* encounters files owned by a user outside of the closed interval
* [uidRange->first, uidRange->second].
*/
void canonicalisePathMetaData(
const Path & path,
std::optional<std::pair<uid_t, uid_t>> uidRange,

14
src/libstore/lock.hh
View file

@ -13,14 +13,18 @@ struct UserLock
{
virtual ~UserLock() { }
/* Get the first and last UID. */
/**
* Get the first and last UID.
*/
std::pair<uid_t, uid_t> getUIDRange()
{
auto first = getUID();
return {first, first + getUIDCount() - 1};
}
/* Get the first UID. */
/**
* Get the first UID.
*/
virtual uid_t getUID() = 0;
virtual uid_t getUIDCount() = 0;
@ -30,8 +34,10 @@ struct UserLock
virtual std::vector<gid_t> getSupplementaryGIDs() = 0;
};
/* Acquire a user lock for a UID range of size `nrIds`. Note that this
may return nullptr if no user is available. */
/**
* Acquire a user lock for a UID range of size `nrIds`. Note that this
* may return nullptr if no user is available.
*/
std::unique_ptr<UserLock> acquireUserLock(uid_t nrIds, bool useUserNamespace);
bool useBuildUsers();

6
src/libstore/log-store.hh
View file

@ -10,8 +10,10 @@ struct LogStore : public virtual Store
{
inline static std::string operationName = "Build log storage and retrieval";
/* Return the build log of the specified store path, if available,
or null otherwise. */
/**
* Return the build log of the specified store path, if available,
* or null otherwise.
*/
std::optional<std::string> getBuildLog(const StorePath & path);
virtual std::optional<std::string> getBuildLogExact(const StorePath & path) = 0;

22
src/libstore/nar-accessor.hh
View file

@ -10,24 +10,30 @@ namespace nix {
struct Source;
/* Return an object that provides access to the contents of a NAR
file. */
/**
* Return an object that provides access to the contents of a NAR
* file.
*/
ref<FSAccessor> makeNarAccessor(std::string && nar);
ref<FSAccessor> makeNarAccessor(Source & source);
/* Create a NAR accessor from a NAR listing (in the format produced by
listNar()). The callback getNarBytes(offset, length) is used by the
readFile() method of the accessor to get the contents of files
inside the NAR. */
/**
* Create a NAR accessor from a NAR listing (in the format produced by
* listNar()). The callback getNarBytes(offset, length) is used by the
* readFile() method of the accessor to get the contents of files
* inside the NAR.
*/
typedef std::function<std::string(uint64_t, uint64_t)> GetNarBytes;
ref<FSAccessor> makeLazyNarAccessor(
const std::string & listing,
GetNarBytes getNarBytes);
/* Write a JSON representation of the contents of a NAR (except file
contents). */
/**
* Write a JSON representation of the contents of a NAR (except file
* contents).
*/
nlohmann::json listNar(ref<FSAccessor> accessor, const Path & path, bool recurse);
}

6
src/libstore/nar-info-disk-cache.hh
View file

@ -43,8 +43,10 @@ public:
const std::string & uri, const DrvOutput & id) = 0;
};
/* Return a singleton cache object that can be used concurrently by
multiple threads. */
/**
* Return a singleton cache object that can be used concurrently by
* multiple threads.
*/
ref<NarInfoDiskCache> getNarInfoDiskCache();
ref<NarInfoDiskCache> getTestNarInfoDiskCache(Path dbPath);

81
src/libstore/path-info.hh
View file

@ -19,8 +19,14 @@ struct SubstitutablePathInfo
{
std::optional<StorePath> deriver;
StorePathSet references;
uint64_t downloadSize; /* 0 = unknown or inapplicable */
uint64_t narSize; /* 0 = unknown */
/**
* 0 = unknown or inapplicable
*/
uint64_t downloadSize;
/**
* 0 = unknown
*/
uint64_t narSize;
};
typedef std::map<StorePath, SubstitutablePathInfo> SubstitutablePathInfos;
@ -30,34 +36,39 @@ struct ValidPathInfo
{
StorePath path;
std::optional<StorePath> deriver;
// TODO document this
/**
* \todo document this
*/
Hash narHash;
StorePathSet references;
time_t registrationTime = 0;
uint64_t narSize = 0; // 0 = unknown
uint64_t id; // internal use only
/* Whether the path is ultimately trusted, that is, it's a
derivation output that was built locally. */
/**
* Whether the path is ultimately trusted, that is, it's a
* derivation output that was built locally.
*/
bool ultimate = false;
StringSet sigs; // note: not necessarily verified
/* If non-empty, an assertion that the path is content-addressed,
i.e., that the store path is computed from a cryptographic hash
of the contents of the path, plus some other bits of data like
the "name" part of the path. Such a path doesn't need
signatures, since we don't have to trust anybody's claim that
the path is the output of a particular derivation. (In the
extensional store model, we have to trust that the *contents*
of an output path of a derivation were actually produced by
that derivation. In the intensional model, we have to trust
that a particular output path was produced by a derivation; the
path then implies the contents.)
Ideally, the content-addressability assertion would just be a Boolean,
and the store path would be computed from the name component, ‘narHash’
and ‘references’. However, we support many types of content addresses.
/**
* If non-empty, an assertion that the path is content-addressed,
* i.e., that the store path is computed from a cryptographic hash
* of the contents of the path, plus some other bits of data like
* the "name" part of the path. Such a path doesn't need
* signatures, since we don't have to trust anybody's claim that
* the path is the output of a particular derivation. (In the
* extensional store model, we have to trust that the *contents*
* of an output path of a derivation were actually produced by
* that derivation. In the intensional model, we have to trust
* that a particular output path was produced by a derivation; the
* path then implies the contents.)
*
* Ideally, the content-addressability assertion would just be a Boolean,
* and the store path would be computed from the name component, ‘narHash’
* and ‘references’. However, we support many types of content addresses.
*/
std::optional<ContentAddress> ca;
@ -69,27 +80,35 @@ struct ValidPathInfo
&& references == i.references;
}
/* Return a fingerprint of the store path to be used in binary
cache signatures. It contains the store path, the base-32
SHA-256 hash of the NAR serialisation of the path, the size of
the NAR, and the sorted references. The size field is strictly
speaking superfluous, but might prevent endless/excessive data
attacks. */
/**
* Return a fingerprint of the store path to be used in binary
* cache signatures. It contains the store path, the base-32
* SHA-256 hash of the NAR serialisation of the path, the size of
* the NAR, and the sorted references. The size field is strictly
* speaking superfluous, but might prevent endless/excessive data
* attacks.
*/
std::string fingerprint(const Store & store) const;
void sign(const Store & store, const SecretKey & secretKey);
/* Return true iff the path is verifiably content-addressed. */
/**
* @return true iff the path is verifiably content-addressed.
*/
bool isContentAddressed(const Store & store) const;
static const size_t maxSigs = std::numeric_limits<size_t>::max();
/* Return the number of signatures on this .narinfo that were
produced by one of the specified keys, or maxSigs if the path
is content-addressed. */
/**
* Return the number of signatures on this .narinfo that were
* produced by one of the specified keys, or maxSigs if the path
* is content-addressed.
*/
size_t checkSignatures(const Store & store, const PublicKeys & publicKeys) const;
/* Verify a single signature. */
/**
* Verify a single signature.
*/
bool checkSignature(const Store & store, const PublicKeys & publicKeys, const std::string & sig) const;
Strings shortRefs() const;

23
src/libstore/path-with-outputs.hh
View file

@ -6,13 +6,14 @@
namespace nix {
/* This is a deprecated old type just for use by the old CLI, and older
versions of the RPC protocols. In new code don't use it; you want
`DerivedPath` instead.
`DerivedPath` is better because it handles more cases, and does so more
explicitly without devious punning tricks.
*/
/**
* This is a deprecated old type just for use by the old CLI, and older
* versions of the RPC protocols. In new code don't use it; you want
* `DerivedPath` instead.
*
* `DerivedPath` is better because it handles more cases, and does so more
* explicitly without devious punning tricks.
*/
struct StorePathWithOutputs
{
StorePath path;
@ -31,9 +32,11 @@ std::pair<std::string_view, StringSet> parsePathWithOutputs(std::string_view s);
class Store;
/* Split a string specifying a derivation and a set of outputs
(/nix/store/hash-foo!out1,out2,...) into the derivation path
and the outputs. */
/**
* Split a string specifying a derivation and a set of outputs
* (/nix/store/hash-foo!out1,out2,...) into the derivation path
* and the outputs.
*/
StorePathWithOutputs parsePathWithOutputs(const Store & store, std::string_view pathWithOutputs);
StorePathWithOutputs followLinksToStorePathWithOutputs(const Store & store, std::string_view pathWithOutputs);

12
src/libstore/pathlocks.hh
View file

@ -5,12 +5,16 @@
namespace nix {
/* Open (possibly create) a lock file and return the file descriptor.
-1 is returned if create is false and the lock could not be opened
because it doesn't exist. Any other error throws an exception. */
/**
* Open (possibly create) a lock file and return the file descriptor.
* -1 is returned if create is false and the lock could not be opened
* because it doesn't exist. Any other error throws an exception.
*/
AutoCloseFD openLockFile(const Path & path, bool create);
/* Delete an open lock file. */
/**
* Delete an open lock file.
*/
void deleteLockFile(const Path & path, int fd);
enum LockType { ltRead, ltWrite, ltNone };

42
src/libstore/profiles.hh
View file

@ -1,7 +1,7 @@
#pragma once
///@file
#include "types.hh"
#include "types.hh"
#include "pathlocks.hh"
#include <time.h>
@ -24,9 +24,11 @@ struct Generation
typedef std::list<Generation> Generations;
/* Returns the list of currently present generations for the specified
profile, sorted by generation number. Also returns the number of
the current generation. */
/**
* Returns the list of currently present generations for the specified
* profile, sorted by generation number. Also returns the number of
* the current generation.
*/
std::pair<Generations, std::optional<GenerationNumber>> findGenerations(Path profile);
class LocalFSStore;
@ -47,26 +49,32 @@ void deleteGenerationsOlderThan(const Path & profile, std::string_view timeSpec,
void switchLink(Path link, Path target);
/* Roll back a profile to the specified generation, or to the most
recent one older than the current. */
/**
* Roll back a profile to the specified generation, or to the most
* recent one older than the current.
*/
void switchGeneration(
const Path & profile,
std::optional<GenerationNumber> dstGen,
bool dryRun);
/* Ensure exclusive access to a profile. Any command that modifies
the profile first acquires this lock. */
/**
* Ensure exclusive access to a profile. Any command that modifies
* the profile first acquires this lock.
*/
void lockProfile(PathLocks & lock, const Path & profile);
/* Optimistic locking is used by long-running operations like `nix-env
-i'. Instead of acquiring the exclusive lock for the entire
duration of the operation, we just perform the operation
optimistically (without an exclusive lock), and check at the end
whether the profile changed while we were busy (i.e., the symlink
target changed). If so, the operation is restarted. Restarting is
generally cheap, since the build results are still in the Nix
store. Most of the time, only the user environment has to be
rebuilt. */
/**
* Optimistic locking is used by long-running operations like `nix-env
* -i'. Instead of acquiring the exclusive lock for the entire
* duration of the operation, we just perform the operation
* optimistically (without an exclusive lock), and check at the end
* whether the profile changed while we were busy (i.e., the symlink
* target changed). If so, the operation is restarted. Restarting is
* generally cheap, since the build results are still in the Nix
* store. Most of the time, only the user environment has to be
* rebuilt.
*/
std::string optimisticLockProfile(const Path & profile);
/**

14
src/libstore/remote-store.hh
View file

@ -32,8 +32,10 @@ struct RemoteStoreConfig : virtual StoreConfig
"Maximum age of a connection before it is closed."};
};
/* FIXME: RemoteStore is a misnomer - should be something like
DaemonStore. */
/**
* \todo RemoteStore is a misnomer - should be something like
* DaemonStore.
*/
class RemoteStore : public virtual RemoteStoreConfig,
public virtual Store,
public virtual GcStore,
@ -69,7 +71,9 @@ public:
void querySubstitutablePathInfos(const StorePathCAMap & paths,
SubstitutablePathInfos & infos) override;
/* Add a content-addressable store path. `dump` will be drained. */
/**
* Add a content-addressable store path. `dump` will be drained.
*/
ref<const ValidPathInfo> addCAToStore(
Source & dump,
std::string_view name,
@ -77,7 +81,9 @@ public:
const StorePathSet & references,
RepairFlag repair);
/* Add a content-addressable store path. Does not support references. `dump` will be drained. */
/**
* Add a content-addressable store path. Does not support references. `dump` will be drained.
*/
StorePath addToStoreFromDump(Source & dump, std::string_view name,
FileIngestionMethod method = FileIngestionMethod::Recursive, HashType hashAlgo = htSHA256, RepairFlag repair = NoRepair, const StorePathSet & references = StorePathSet()) override;

42
src/libstore/sqlite.hh
View file

@ -11,7 +11,9 @@ struct sqlite3_stmt;
namespace nix {
/* RAII wrapper to close a SQLite database automatically. */
/**
* RAII wrapper to close a SQLite database automatically.
*/
struct SQLite
{
sqlite3 * db = 0;
@ -23,7 +25,9 @@ struct SQLite
~SQLite();
operator sqlite3 * () { return db; }
/* Disable synchronous mode, set truncate journal mode. */
/**
* Disable synchronous mode, set truncate journal mode.
*/
void isCache();
void exec(const std::string & stmt);
@ -31,7 +35,9 @@ struct SQLite
uint64_t getLastInsertedRowId();
};
/* RAII wrapper to create and destroy SQLite prepared statements. */
/**
* RAII wrapper to create and destroy SQLite prepared statements.
*/
struct SQLiteStmt
{
sqlite3 * db = 0;
@ -43,7 +49,9 @@ struct SQLiteStmt
~SQLiteStmt();
operator sqlite3_stmt * () { return stmt; }
/* Helper for binding / executing statements. */
/**
* Helper for binding / executing statements.
*/
class Use
{
friend struct SQLiteStmt;
@ -56,7 +64,9 @@ struct SQLiteStmt
~Use();
/* Bind the next parameter. */
/**
* Bind the next parameter.
*/
Use & operator () (std::string_view value, bool notNull = true);
Use & operator () (const unsigned char * data, size_t len, bool notNull = true);
Use & operator () (int64_t value, bool notNull = true);
@ -64,11 +74,15 @@ struct SQLiteStmt
int step();
/* Execute a statement that does not return rows. */
/**
* Execute a statement that does not return rows.
*/
void exec();
/* For statements that return 0 or more rows. Returns true iff
a row is available. */
/**
* For statements that return 0 or more rows. Returns true iff
* a row is available.
*/
bool next();
std::string getStr(int col);
@ -82,8 +96,10 @@ struct SQLiteStmt
}
};
/* RAII helper that ensures transactions are aborted unless explicitly
committed. */
/**
* RAII helper that ensures transactions are aborted unless explicitly
* committed.
*/
struct SQLiteTxn
{
bool active = false;
@ -125,8 +141,10 @@ MakeError(SQLiteBusy, SQLiteError);
void handleSQLiteBusy(const SQLiteBusy & e);
/* Convenience function for retrying a SQLite transaction when the
database is busy. */
/**
* Convenience function for retrying a SQLite transaction when the
* database is busy.
*/
template<typename T, typename F>
T retrySQLite(F && fun)
{

22
src/libstore/store-api.hh
View file

@ -411,17 +411,17 @@ public:
{ unsupported("queryReferrers"); }
/**
* @return all currently valid derivations that have `path' as an
* @return all currently valid derivations that have `path` as an
* output.
*
* (Note that the result of `queryDeriver()' is the derivation that
* was actually used to produce `path', which may not exist
* (Note that the result of `queryDeriver()` is the derivation that
* was actually used to produce `path`, which may not exist
* anymore.)
*/
virtual StorePathSet queryValidDerivers(const StorePath & path) { return {}; };
/**
* Query the outputs of the derivation denoted by `path'.
* Query the outputs of the derivation denoted by `path`.
*/
virtual StorePathSet queryDerivationOutputs(const StorePath & path);
@ -513,7 +513,7 @@ public:
/**
* Like addToStore(), but the contents of the path are contained
* in `dump', which is either a NAR serialisation (if recursive ==
* in `dump`, which is either a NAR serialisation (if recursive ==
* true) or simply the contents of a regular file (if recursive ==
* false).
* `dump` may be drained
@ -634,8 +634,8 @@ public:
/**
* @return a string representing information about the path that
* can be loaded into the database using `nix-store --load-db' or
* `nix-store --register-validity'.
* can be loaded into the database using `nix-store --load-db` or
* `nix-store --register-validity`.
*/
std::string makeValidityRegistration(const StorePathSet & paths,
bool showDerivers, bool showHash);
@ -715,12 +715,12 @@ public:
/**
* @param [out] out Place in here the set of all store paths in the
* file system closure of `storePath'; that is, all paths than can
* be directly or indirectly reached from it. `out' is not cleared.
* file system closure of `storePath`; that is, all paths than can
* be directly or indirectly reached from it. `out` is not cleared.
*
* @param flipDirection If true, the set of paths that can reach
* `storePath' is returned; that is, the closures under the
* `referrers' relation instead of the `references' relation is
* `storePath` is returned; that is, the closures under the
* `referrers` relation instead of the `references` relation is
* returned.
*/
virtual void computeFSClosure(const StorePathSet & paths,

7
src/libutil/ansicolor.hh
View file

@ -1,9 +1,12 @@
#pragma once
///@file
/**
* @file
*
* @brief Some ANSI escape sequences.
*/
namespace nix {
/* Some ANSI escape sequences. */
#define ANSI_NORMAL "\e[0m"
#define ANSI_BOLD "\e[1m"
#define ANSI_FAINT "\e[2m"

10
src/libutil/archive.hh
View file

@ -20,6 +20,7 @@ namespace nix {
*
* The format is as follows:
*
* ```
* IF path points to a REGULAR FILE:
* dump(path) = attrs(
* [ ("type", "regular")
@ -49,10 +50,11 @@ namespace nix {
*
* sort(strings) = lexicographic sort by 8-bit value (strcmp).
*
* entries(path) = the entries of a directory, without `.' and
* `..'.
* entries(path) = the entries of a directory, without `.` and
* `..`.
*
* `+' denotes string concatenation.
* `+` denotes string concatenation.
* ```
*/
void dumpPath(const Path & path, Sink & sink,
PathFilter & filter = defaultPathFilter);
@ -88,7 +90,7 @@ struct ParseSink
/**
* If the NAR archive contains a single file at top-level, then save
* the contents of the file to `s'. Otherwise barf.
* the contents of the file to `s`. Otherwise barf.
*/
struct RetrieveRegularNARSink : ParseSink
{

6
src/libutil/canon-path.hh
View file

@ -192,8 +192,10 @@ public:
*/
bool isAllowed(const std::set<CanonPath> & allowed) const;
/* Return a representation `x` of `path` relative to `this`, i.e.
`CanonPath(this.makeRelative(x), this) == path`. */
/**
* Return a representation `x` of `path` relative to `this`, i.e.
* `CanonPath(this.makeRelative(x), this) == path`.
*/
std::string makeRelative(const CanonPath & path) const;
};

32
src/libutil/error.hh
View file

@ -1,5 +1,19 @@
#pragma once
///@file
/**
* @file
*
* @brief This file defines two main structs/classes used in nix error handling.
*
* ErrorInfo provides a standard payload of error information, with conversion to string
* happening in the logger rather than at the call site.
*
* BaseError is the ancestor of nix specific exceptions (and Interrupted), and contains
* an ErrorInfo.
*
* ErrorInfo structs are sent to the logger as part of an exception, or directly with the
* logError or logWarning macros.
* See libutil/tests/logging.cc for usage examples.
*/
#include "suggestions.hh"
#include "ref.hh"
@ -27,22 +41,6 @@
namespace nix {
/*
This file defines two main structs/classes used in nix error handling.
ErrorInfo provides a standard payload of error information, with conversion to string
happening in the logger rather than at the call site.
BaseError is the ancestor of nix specific exceptions (and Interrupted), and contains
an ErrorInfo.
ErrorInfo structs are sent to the logger as part of an exception, or directly with the
logError or logWarning macros.
See libutil/tests/logging.cc for usage examples.
*/
typedef enum {
lvlError = 0,

23
src/libutil/logging.hh
View file

@ -183,12 +183,17 @@ bool handleJSONLogMessage(const std::string & msg,
const Activity & act, std::map<ActivityId, Activity> & activities,
bool trusted);
extern Verbosity verbosity; /* suppress msgs > this */
/**
* suppress msgs > this
*/
extern Verbosity verbosity;
/* Print a message with the standard ErrorInfo format.
In general, use these 'log' macros for reporting problems that may require user
intervention or that need more explanation. Use the 'print' macros for more
lightweight status messages. */
/**
* Print a message with the standard ErrorInfo format.
* In general, use these 'log' macros for reporting problems that may require user
* intervention or that need more explanation. Use the 'print' macros for more
* lightweight status messages.
*/
#define logErrorInfo(level, errorInfo...) \
do { \
if ((level) <= nix::verbosity) { \
@ -199,9 +204,11 @@ extern Verbosity verbosity; /* suppress msgs > this */
#define logError(errorInfo...) logErrorInfo(lvlError, errorInfo)
#define logWarning(errorInfo...) logErrorInfo(lvlWarn, errorInfo)
/* Print a string message if the current log level is at least the specified
level. Note that this has to be implemented as a macro to ensure that the
arguments are evaluated lazily. */
/**
* Print a string message if the current log level is at least the specified
* level. Note that this has to be implemented as a macro to ensure that the
* arguments are evaluated lazily.
*/
#define printMsgUsing(loggerParam, level, args...) \
do { \
auto __lvl = level; \

478
src/libutil/util.hh
View file

@ -33,77 +33,112 @@ struct Sink;
struct Source;
/* The system for which Nix is compiled. */
/**
* The system for which Nix is compiled.
*/
extern const std::string nativeSystem;
/* Return an environment variable. */
/**
* @return an environment variable.
*/
std::optional<std::string> getEnv(const std::string & key);
/* Return a non empty environment variable. Returns nullopt if the env
variable is set to "" */
/**
* @return a non empty environment variable. Returns nullopt if the env
* variable is set to ""
*/
std::optional<std::string> getEnvNonEmpty(const std::string & key);
/* Get the entire environment. */
/**
* Get the entire environment.
*/
std::map<std::string, std::string> getEnv();
/* Clear the environment. */
/**
* Clear the environment.
*/
void clearEnv();
/* Return an absolutized path, resolving paths relative to the
specified directory, or the current directory otherwise. The path
is also canonicalised. */
/**
* @return An absolutized path, resolving paths relative to the
* specified directory, or the current directory otherwise. The path
* is also canonicalised.
*/
Path absPath(Path path,
std::optional<PathView> dir = {},
bool resolveSymlinks = false);
/* Canonicalise a path by removing all `.' or `..' components and
double or trailing slashes. Optionally resolves all symlink
components such that each component of the resulting path is *not*
a symbolic link. */
/**
* Canonicalise a path by removing all `.` or `..` components and
* double or trailing slashes. Optionally resolves all symlink
* components such that each component of the resulting path is *not*
* a symbolic link.
*/
Path canonPath(PathView path, bool resolveSymlinks = false);
/* Return the directory part of the given canonical path, i.e.,
everything before the final `/'. If the path is the root or an
immediate child thereof (e.g., `/foo'), this means `/'
is returned.*/
/**
* @return The directory part of the given canonical path, i.e.,
* everything before the final `/`. If the path is the root or an
* immediate child thereof (e.g., `/foo`), this means `/`
* is returned.
*/
Path dirOf(const PathView path);
/* Return the base name of the given canonical path, i.e., everything
following the final `/' (trailing slashes are removed). */
/**
* @return the base name of the given canonical path, i.e., everything
* following the final `/` (trailing slashes are removed).
*/
std::string_view baseNameOf(std::string_view path);
/* Perform tilde expansion on a path. */
/**
* Perform tilde expansion on a path.
*/
std::string expandTilde(std::string_view path);
/* Check whether 'path' is a descendant of 'dir'. Both paths must be
canonicalized. */
/**
* Check whether 'path' is a descendant of 'dir'. Both paths must be
* canonicalized.
*/
bool isInDir(std::string_view path, std::string_view dir);
/* Check whether 'path' is equal to 'dir' or a descendant of
'dir'. Both paths must be canonicalized. */
/**
* Check whether 'path' is equal to 'dir' or a descendant of
* 'dir'. Both paths must be canonicalized.
*/
bool isDirOrInDir(std::string_view path, std::string_view dir);
/* Get status of `path'. */
/**
* Get status of `path`.
*/
struct stat stat(const Path & path);
struct stat lstat(const Path & path);
/* Return true iff the given path exists. */
/**
* @return true iff the given path exists.
*/
bool pathExists(const Path & path);
/* Read the contents (target) of a symbolic link. The result is not
in any way canonicalised. */
/**
* Read the contents (target) of a symbolic link. The result is not
* in any way canonicalised.
*/
Path readLink(const Path & path);
bool isLink(const Path & path);
/* Read the contents of a directory. The entries `.' and `..' are
removed. */
/**
* Read the contents of a directory. The entries `.` and `..` are
* removed.
*/
struct DirEntry
{
std::string name;
ino_t ino;
unsigned char type; // one of DT_*
/**
* one of DT_*
*/
unsigned char type;
DirEntry(std::string name, ino_t ino, unsigned char type)
: name(std::move(name)), ino(ino), type(type) { }
};
@ -114,74 +149,110 @@ DirEntries readDirectory(const Path & path);
unsigned char getFileType(const Path & path);
/* Read the contents of a file into a string. */
/**
* Read the contents of a file into a string.
*/
std::string readFile(int fd);
std::string readFile(const Path & path);
void readFile(const Path & path, Sink & sink);
/* Write a string to a file. */
/**
* Write a string to a file.
*/
void writeFile(const Path & path, std::string_view s, mode_t mode = 0666, bool sync = false);
void writeFile(const Path & path, Source & source, mode_t mode = 0666, bool sync = false);
/* Flush a file's parent directory to disk */
/**
* Flush a file's parent directory to disk
*/
void syncParent(const Path & path);
/* Read a line from a file descriptor. */
/**
* Read a line from a file descriptor.
*/
std::string readLine(int fd);
/* Write a line to a file descriptor. */
/**
* Write a line to a file descriptor.
*/
void writeLine(int fd, std::string s);
/* Delete a path; i.e., in the case of a directory, it is deleted
recursively. It's not an error if the path does not exist. The
second variant returns the number of bytes and blocks freed. */
/**
* Delete a path; i.e., in the case of a directory, it is deleted
* recursively. It's not an error if the path does not exist. The
* second variant returns the number of bytes and blocks freed.
*/
void deletePath(const Path & path);
void deletePath(const Path & path, uint64_t & bytesFreed);
std::string getUserName();
/* Return the given user's home directory from /etc/passwd. */
/**
* @return the given user's home directory from /etc/passwd.
*/
Path getHomeOf(uid_t userId);
/* Return $HOME or the user's home directory from /etc/passwd. */
/**
* @return $HOME or the user's home directory from /etc/passwd.
*/
Path getHome();
/* Return $XDG_CACHE_HOME or $HOME/.cache. */
/**
* @return $XDG_CACHE_HOME or $HOME/.cache.
*/
Path getCacheDir();
/* Return $XDG_CONFIG_HOME or $HOME/.config. */
/**
* @return $XDG_CONFIG_HOME or $HOME/.config.
*/
Path getConfigDir();
/* Return the directories to search for user configuration files */
/**
* @return the directories to search for user configuration files
*/
std::vector<Path> getConfigDirs();
/* Return $XDG_DATA_HOME or $HOME/.local/share. */
/**
* @return $XDG_DATA_HOME or $HOME/.local/share.
*/
Path getDataDir();
/* Return the path of the current executable. */
/**
* @return the path of the current executable.
*/
std::optional<Path> getSelfExe();
/* Return $XDG_STATE_HOME or $HOME/.local/state. */
/**
* @return $XDG_STATE_HOME or $HOME/.local/state.
*/
Path getStateDir();
/* Create the Nix state directory and return the path to it. */
/**
* Create the Nix state directory and return the path to it.
*/
Path createNixStateDir();
/* Create a directory and all its parents, if necessary. Returns the
list of created directories, in order of creation. */
/**
* Create a directory and all its parents, if necessary. Returns the
* list of created directories, in order of creation.
*/
Paths createDirs(const Path & path);
inline Paths createDirs(PathView path)
{
return createDirs(Path(path));
}
/* Create a symlink. */
/**
* Create a symlink.
*/
void createSymlink(const Path & target, const Path & link,
std::optional<time_t> mtime = {});
/* Atomically create or replace a symlink. */
/**
* Atomically create or replace a symlink.
*/
void replaceSymlink(const Path & target, const Path & link,
std::optional<time_t> mtime = {});
@ -197,24 +268,32 @@ void renameFile(const Path & src, const Path & dst);
void moveFile(const Path & src, const Path & dst);
/* Wrappers arount read()/write() that read/write exactly the
requested number of bytes. */
/**
* Wrappers arount read()/write() that read/write exactly the
* requested number of bytes.
*/
void readFull(int fd, char * buf, size_t count);
void writeFull(int fd, std::string_view s, bool allowInterrupts = true);
MakeError(EndOfFile, Error);
/* Read a file descriptor until EOF occurs. */
/**
* Read a file descriptor until EOF occurs.
*/
std::string drainFD(int fd, bool block = true, const size_t reserveSize=0);
void drainFD(int fd, Sink & sink, bool block = true);
/* If cgroups are active, attempt to calculate the number of CPUs available.
If cgroups are unavailable or if cpu.max is set to "max", return 0. */
/**
* If cgroups are active, attempt to calculate the number of CPUs available.
* If cgroups are unavailable or if cpu.max is set to "max", return 0.
*/
unsigned int getMaxCPU();
/* Automatic cleanup of resources. */
/**
* Automatic cleanup of resources.
*/
class AutoDelete
@ -252,11 +331,15 @@ public:
};
/* Create a temporary directory. */
/**
* Create a temporary directory.
*/
Path createTempDir(const Path & tmpRoot = "", const Path & prefix = "nix",
bool includePid = true, bool useGlobalCounter = true, mode_t mode = 0755);
/* Create a temporary file, returning a file handle and its path. */
/**
* Create a temporary file, returning a file handle and its path.
*/
std::pair<AutoCloseFD, Path> createTempFile(const Path & prefix = "nix");
@ -299,27 +382,36 @@ public:
};
/* Kill all processes running under the specified uid by sending them
a SIGKILL. */
/**
* Kill all processes running under the specified uid by sending them
* a SIGKILL.
*/
void killUser(uid_t uid);
/* Fork a process that runs the given function, and return the child
pid to the caller. */
/**
* Fork a process that runs the given function, and return the child
* pid to the caller.
*/
struct ProcessOptions
{
std::string errorPrefix = "";
bool dieWithParent = true;
bool runExitHandlers = false;
bool allowVfork = false;
int cloneFlags = 0; // use clone() with the specified flags (Linux only)
/**
* use clone() with the specified flags (Linux only)
*/
int cloneFlags = 0;
};
pid_t startProcess(std::function<void()> fun, const ProcessOptions & options = ProcessOptions());
/* Run a program and return its stdout in a string (i.e., like the
shell backtick operator). */
/**
* Run a program and return its stdout in a string (i.e., like the
* shell backtick operator).
*/
std::string runProgram(Path program, bool searchPath = false,
const Strings & args = Strings(),
const std::optional<std::string> & input = {});
@ -344,25 +436,35 @@ std::pair<int, std::string> runProgram(RunOptions && options);
void runProgram2(const RunOptions & options);
/* Change the stack size. */
/**
* Change the stack size.
*/
void setStackSize(size_t stackSize);
/* Restore the original inherited Unix process context (such as signal
masks, stack size). */
/**
* Restore the original inherited Unix process context (such as signal
* masks, stack size).
*/
void restoreProcessContext(bool restoreMounts = true);
/* Save the current mount namespace. Ignored if called more than
once. */
/**
* Save the current mount namespace. Ignored if called more than
* once.
*/
void saveMountNamespace();
/* Restore the mount namespace saved by saveMountNamespace(). Ignored
if saveMountNamespace() was never called. */
/**
* Restore the mount namespace saved by saveMountNamespace(). Ignored
* if saveMountNamespace() was never called.
*/
void restoreMountNamespace();
/* Cause this thread to not share any FS attributes with the main
thread, because this causes setns() in restoreMountNamespace() to
fail. */
/**
* Cause this thread to not share any FS attributes with the main
* thread, because this causes setns() in restoreMountNamespace() to
* fail.
*/
void unshareFilesystem();
@ -377,16 +479,22 @@ public:
{ }
};
/* Convert a list of strings to a null-terminated vector of char
*'s. The result must not be accessed beyond the lifetime of the
list of strings. */
/**
* Convert a list of strings to a null-terminated vector of `char
* *`s. The result must not be accessed beyond the lifetime of the
* list of strings.
*/
std::vector<char *> stringsToCharPtrs(const Strings & ss);
/* Close all file descriptors except those listed in the given set.
Good practice in child processes. */
/**
* Close all file descriptors except those listed in the given set.
* Good practice in child processes.
*/
void closeMostFDs(const std::set<int> & exceptions);
/* Set the close-on-exec flag for the given file descriptor. */
/**
* Set the close-on-exec flag for the given file descriptor.
*/
void closeOnExec(int fd);
@ -412,12 +520,16 @@ MakeError(Interrupted, BaseError);
MakeError(FormatError, Error);
/* String tokenizer. */
/**
* String tokenizer.
*/
template<class C> C tokenizeString(std::string_view s, std::string_view separators = " \t\n\r");
/* Concatenate the given strings with a separator between the
elements. */
/**
* Concatenate the given strings with a separator between the
* elements.
*/
template<class C>
std::string concatStringsSep(const std::string_view sep, const C & ss)
{
@ -442,7 +554,9 @@ auto concatStrings(Parts && ... parts)
}
/* Add quotes around a collection of strings. */
/**
* Add quotes around a collection of strings.
*/
template<class C> Strings quoteStrings(const C & c)
{
Strings res;
@ -451,16 +565,23 @@ template<class C> Strings quoteStrings(const C & c)
return res;
}
/* Remove trailing whitespace from a string. FIXME: return
std::string_view. */
/**
* Remove trailing whitespace from a string.
*
* \todo return std::string_view.
*/
std::string chomp(std::string_view s);
/* Remove whitespace from the start and end of a string. */
/**
* Remove whitespace from the start and end of a string.
*/
std::string trim(std::string_view s, std::string_view whitespace = " \n\r\t");
/* Replace all occurrences of a string inside another string. */
/**
* Replace all occurrences of a string inside another string.
*/
std::string replaceStrings(
std::string s,
std::string_view from,
@ -470,14 +591,18 @@ std::string replaceStrings(
std::string rewriteStrings(std::string s, const StringMap & rewrites);
/* Convert the exit status of a child as returned by wait() into an
error string. */
/**
* Convert the exit status of a child as returned by wait() into an
* error string.
*/
std::string statusToString(int status);
bool statusOk(int status);
/* Parse a string into an integer. */
/**
* Parse a string into an integer.
*/
template<class N>
std::optional<N> string2Int(const std::string_view s)
{
@ -490,8 +615,10 @@ std::optional<N> string2Int(const std::string_view s)
}
}
/* Like string2Int(), but support an optional suffix 'K', 'M', 'G' or
'T' denoting a binary unit prefix. */
/**
* Like string2Int(), but support an optional suffix 'K', 'M', 'G' or
* 'T' denoting a binary unit prefix.
*/
template<class N>
N string2IntWithUnitPrefix(std::string_view s)
{
@ -512,7 +639,9 @@ N string2IntWithUnitPrefix(std::string_view s)
throw UsageError("'%s' is not an integer", s);
}
/* Parse a string into a float. */
/**
* Parse a string into a float.
*/
template<class N>
std::optional<N> string2Float(const std::string_view s)
{
@ -524,7 +653,9 @@ std::optional<N> string2Float(const std::string_view s)
}
/* Convert a little-endian integer to host order. */
/**
* Convert a little-endian integer to host order.
*/
template<typename T>
T readLittleEndian(unsigned char * p)
{
@ -536,66 +667,90 @@ T readLittleEndian(unsigned char * p)
}
/* Return true iff `s' starts with `prefix'. */
/**
* @return true iff `s` starts with `prefix`.
*/
bool hasPrefix(std::string_view s, std::string_view prefix);
/* Return true iff `s' ends in `suffix'. */
/**
* @return true iff `s` ends in `suffix`.
*/
bool hasSuffix(std::string_view s, std::string_view suffix);
/* Convert a string to lower case. */
/**
* Convert a string to lower case.
*/
std::string toLower(const std::string & s);
/* Escape a string as a shell word. */
/**
* Escape a string as a shell word.
*/
std::string shellEscape(const std::string_view s);
/* Exception handling in destructors: print an error message, then
ignore the exception. */
/**
* Exception handling in destructors: print an error message, then
* ignore the exception.
*/
void ignoreException(Verbosity lvl = lvlError);
/* Tree formatting. */
/**
* Tree formatting.
*/
constexpr char treeConn[] = "├───";
constexpr char treeLast[] = "└───";
constexpr char treeLine[] = "│ ";
constexpr char treeNull[] = " ";
/* Determine whether ANSI escape sequences are appropriate for the
present output. */
/**
* Determine whether ANSI escape sequences are appropriate for the
* present output.
*/
bool shouldANSI();
/* Truncate a string to 'width' printable characters. If 'filterAll'
is true, all ANSI escape sequences are filtered out. Otherwise,
some escape sequences (such as colour setting) are copied but not
included in the character count. Also, tabs are expanded to
spaces. */
/**
* Truncate a string to 'width' printable characters. If 'filterAll'
* is true, all ANSI escape sequences are filtered out. Otherwise,
* some escape sequences (such as colour setting) are copied but not
* included in the character count. Also, tabs are expanded to
* spaces.
*/
std::string filterANSIEscapes(std::string_view s,
bool filterAll = false,
unsigned int width = std::numeric_limits<unsigned int>::max());
/* Base64 encoding/decoding. */
/**
* Base64 encoding/decoding.
*/
std::string base64Encode(std::string_view s);
std::string base64Decode(std::string_view s);
/* Remove common leading whitespace from the lines in the string
's'. For example, if every line is indented by at least 3 spaces,
then we remove 3 spaces from the start of every line. */
/**
* Remove common leading whitespace from the lines in the string
* 's'. For example, if every line is indented by at least 3 spaces,
* then we remove 3 spaces from the start of every line.
*/
std::string stripIndentation(std::string_view s);
/* Get the prefix of 's' up to and excluding the next line break (LF
optionally preceded by CR), and the remainder following the line
break. */
/**
* Get the prefix of 's' up to and excluding the next line break (LF
* optionally preceded by CR), and the remainder following the line
* break.
*/
std::pair<std::string_view, std::string_view> getLine(std::string_view s);
/* Get a value for the specified key from an associate container. */
/**
* Get a value for the specified key from an associate container.
*/
template <class T>
const typename T::mapped_type * get(const T & map, const typename T::key_type & key)
{
@ -612,7 +767,9 @@ typename T::mapped_type * get(T & map, const typename T::key_type & key)
return &i->second;
}
/* Get a value for the specified key from an associate container, or a default value if the key isn't present. */
/**
* Get a value for the specified key from an associate container, or a default value if the key isn't present.
*/
template <class T>
const typename T::mapped_type & getOr(T & map,
const typename T::key_type & key,
@ -623,7 +780,9 @@ const typename T::mapped_type & getOr(T & map,
return i->second;
}
/* Remove and return the first item from a container. */
/**
* Remove and return the first item from a container.
*/
template <class T>
std::optional<typename T::value_type> remove_begin(T & c)
{
@ -635,7 +794,9 @@ std::optional<typename T::value_type> remove_begin(T & c)
}
/* Remove and return the first item from a container. */
/**
* Remove and return the first item from a container.
*/
template <class T>
std::optional<typename T::value_type> pop(T & c)
{
@ -650,8 +811,10 @@ template<typename T>
class Callback;
/* Start a thread that handles various signals. Also block those signals
on the current thread (and thus any threads created by it). */
/**
* Start a thread that handles various signals. Also block those signals
* on the current thread (and thus any threads created by it).
*/
void startSignalHandlerThread();
struct InterruptCallback
@ -659,16 +822,20 @@ struct InterruptCallback
virtual ~InterruptCallback() { };
};
/* Register a function that gets called on SIGINT (in a non-signal
context). */
/**
* Register a function that gets called on SIGINT (in a non-signal
* context).
*/
std::unique_ptr<InterruptCallback> createInterruptCallback(
std::function<void()> callback);
void triggerInterrupt();
/* A RAII class that causes the current thread to receive SIGUSR1 when
the signal handler thread receives SIGINT. That is, this allows
SIGINT to be multiplexed to multiple threads. */
/**
* A RAII class that causes the current thread to receive SIGUSR1 when
* the signal handler thread receives SIGINT. That is, this allows
* SIGINT to be multiplexed to multiple threads.
*/
struct ReceiveInterrupts
{
pthread_t target;
@ -682,8 +849,10 @@ struct ReceiveInterrupts
/* A RAII helper that increments a counter on construction and
decrements it on destruction. */
/**
* A RAII helper that increments a counter on construction and
* decrements it on destruction.
*/
template<typename T>
struct MaintainCount
{
@ -694,33 +863,50 @@ struct MaintainCount
};
/* Return the number of rows and columns of the terminal. */
/**
* @return the number of rows and columns of the terminal.
*/
std::pair<unsigned short, unsigned short> getWindowSize();
/* Used in various places. */
/**
* Used in various places.
*/
typedef std::function<bool(const Path & path)> PathFilter;
extern PathFilter defaultPathFilter;
/* Common initialisation performed in child processes. */
/**
* Common initialisation performed in child processes.
*/
void commonChildInit();
/* Create a Unix domain socket. */
/**
* Create a Unix domain socket.
*/
AutoCloseFD createUnixDomainSocket();
/* Create a Unix domain socket in listen mode. */
/**
* Create a Unix domain socket in listen mode.
*/
AutoCloseFD createUnixDomainSocket(const Path & path, mode_t mode);
/* Bind a Unix domain socket to a path. */
/**
* Bind a Unix domain socket to a path.
*/
void bind(int fd, const std::string & path);
/* Connect to a Unix domain socket. */
/**
* Connect to a Unix domain socket.
*/
void connect(int fd, const std::string & path);
// A Rust/Python-like enumerate() iterator adapter.
// Borrowed from http://reedbeta.com/blog/python-like-enumerate-in-cpp17.
/**
* A Rust/Python-like enumerate() iterator adapter.
*
* Borrowed from http://reedbeta.com/blog/python-like-enumerate-in-cpp17.
*/
template <typename T,
typename TIter = decltype(std::begin(std::declval<T>())),
typename = decltype(std::end(std::declval<T>()))>
@ -746,7 +932,9 @@ constexpr auto enumerate(T && iterable)
}
// C++17 std::visit boilerplate
/**
* C++17 std::visit boilerplate
*/
template<class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
template<class... Ts> overloaded(Ts...) -> overloaded<Ts...>;
@ -754,8 +942,10 @@ template<class... Ts> overloaded(Ts...) -> overloaded<Ts...>;
std::string showBytes(uint64_t bytes);
/* Provide an addition operator between strings and string_views
inexplicably omitted from the standard library. */
/**
* Provide an addition operator between strings and string_views
* inexplicably omitted from the standard library.
*/
inline std::string operator + (const std::string & s1, std::string_view s2)
{
auto s = s1;