882 lines
33 KiB
C++
882 lines
33 KiB
C++
#pragma once
|
||
|
||
#include "path.hh"
|
||
#include "hash.hh"
|
||
#include "content-address.hh"
|
||
#include "serialise.hh"
|
||
#include "lru-cache.hh"
|
||
#include "sync.hh"
|
||
#include "globals.hh"
|
||
#include "config.hh"
|
||
#include "derivations.hh"
|
||
#include "path-info.hh"
|
||
|
||
#include <atomic>
|
||
#include <limits>
|
||
#include <map>
|
||
#include <unordered_map>
|
||
#include <unordered_set>
|
||
#include <memory>
|
||
#include <string>
|
||
#include <chrono>
|
||
#include <variant>
|
||
|
||
|
||
namespace nix {
|
||
|
||
/**
|
||
* About the class hierarchy of the store implementations:
|
||
*
|
||
* Each store type `Foo` consists of two classes:
|
||
*
|
||
* 1. A class `FooConfig : virtual StoreConfig` that contains the configuration
|
||
* for the store
|
||
*
|
||
* It should only contain members of type `const Setting<T>` (or subclasses
|
||
* of it) and inherit the constructors of `StoreConfig`
|
||
* (`using StoreConfig::StoreConfig`).
|
||
*
|
||
* 2. A class `Foo : virtual Store, virtual FooConfig` that contains the
|
||
* implementation of the store.
|
||
*
|
||
* This class is expected to have a constructor `Foo(const Params & params)`
|
||
* that calls `StoreConfig(params)` (otherwise you're gonna encounter an
|
||
* `assertion failure` when trying to instantiate it).
|
||
*
|
||
* You can then register the new store using:
|
||
*
|
||
* ```
|
||
* cpp static RegisterStoreImplementation<Foo, FooConfig> regStore;
|
||
* ```
|
||
*/
|
||
|
||
MakeError(SubstError, Error);
|
||
MakeError(BuildError, Error); // denotes a permanent build failure
|
||
MakeError(InvalidPath, Error);
|
||
MakeError(Unsupported, Error);
|
||
MakeError(SubstituteGone, Error);
|
||
MakeError(SubstituterDisabled, Error);
|
||
MakeError(BadStorePath, Error);
|
||
|
||
MakeError(InvalidStoreURI, Error);
|
||
|
||
class FSAccessor;
|
||
class NarInfoDiskCache;
|
||
class Store;
|
||
class JSONPlaceholder;
|
||
|
||
|
||
enum CheckSigsFlag : bool { NoCheckSigs = false, CheckSigs = true };
|
||
enum SubstituteFlag : bool { NoSubstitute = false, Substitute = true };
|
||
enum AllowInvalidFlag : bool { DisallowInvalid = false, AllowInvalid = true };
|
||
|
||
/* Magic header of exportPath() output (obsolete). */
|
||
const uint32_t exportMagic = 0x4558494e;
|
||
|
||
|
||
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.
|
||
*/
|
||
typedef enum {
|
||
gcReturnLive,
|
||
gcReturnDead,
|
||
gcDeleteDead,
|
||
gcDeleteSpecific,
|
||
} GCAction;
|
||
|
||
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). */
|
||
bool ignoreLiveness{false};
|
||
|
||
/* For `gcDeleteSpecific', the paths to delete. */
|
||
StorePathSet pathsToDelete;
|
||
|
||
/* 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. */
|
||
PathSet paths;
|
||
|
||
/* For `gcReturnDead', `gcDeleteDead' and `gcDeleteSpecific', the
|
||
number of bytes that would be or was freed. */
|
||
uint64_t bytesFreed = 0;
|
||
};
|
||
|
||
|
||
enum BuildMode { bmNormal, bmRepair, bmCheck };
|
||
|
||
|
||
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. */
|
||
enum Status {
|
||
Built = 0,
|
||
Substituted,
|
||
AlreadyValid,
|
||
PermanentFailure,
|
||
InputRejected,
|
||
OutputRejected,
|
||
TransientFailure, // possibly transient
|
||
CachedFailure, // no longer used
|
||
TimedOut,
|
||
MiscFailure,
|
||
DependencyFailed,
|
||
LogLimitExceeded,
|
||
NotDeterministic,
|
||
} status = MiscFailure;
|
||
std::string errorMsg;
|
||
|
||
/* 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.) */
|
||
bool isNonDeterministic = false;
|
||
|
||
/* The start/stop times of the build (or one of the rounds, if it
|
||
was repeated). */
|
||
time_t startTime = 0, stopTime = 0;
|
||
|
||
bool success() {
|
||
return status == Built || status == Substituted || status == AlreadyValid;
|
||
}
|
||
};
|
||
|
||
struct StoreConfig : public Config
|
||
{
|
||
using Config::Config;
|
||
|
||
/**
|
||
* When constructing a store implementation, we pass in a map `params` of
|
||
* parameters that's supposed to initialize the associated config.
|
||
* To do that, we must use the `StoreConfig(StringMap & params)`
|
||
* constructor, so we'd like to `delete` its default constructor to enforce
|
||
* it.
|
||
*
|
||
* However, actually deleting it means that all the subclasses of
|
||
* `StoreConfig` will have their default constructor deleted (because it's
|
||
* supposed to call the deleted default constructor of `StoreConfig`). But
|
||
* because we're always using virtual inheritance, the constructors of
|
||
* child classes will never implicitely call this one, so deleting it will
|
||
* be more painful than anything else.
|
||
*
|
||
* So we `assert(false)` here to ensure at runtime that the right
|
||
* constructor is always called without having to redefine a custom
|
||
* constructor for each `*Config` class.
|
||
*/
|
||
StoreConfig() { assert(false); }
|
||
|
||
virtual const std::string name() = 0;
|
||
|
||
const PathSetting storeDir_{this, false, settings.nixStore,
|
||
"store", "path to the Nix store"};
|
||
const Path storeDir = storeDir_;
|
||
|
||
const Setting<int> pathInfoCacheSize{this, 65536, "path-info-cache-size", "size of the in-memory store path information cache"};
|
||
|
||
const Setting<bool> isTrusted{this, false, "trusted", "whether paths from this store can be used as substitutes even when they lack trusted signatures"};
|
||
|
||
Setting<int> priority{this, 0, "priority", "priority of this substituter (lower value means higher priority)"};
|
||
|
||
Setting<bool> wantMassQuery{this, false, "want-mass-query", "whether this substituter can be queried efficiently for path validity"};
|
||
|
||
Setting<StringSet> systemFeatures{this, settings.systemFeatures,
|
||
"system-features",
|
||
"Optional features that the system this store builds on implements (like \"kvm\")."};
|
||
|
||
};
|
||
|
||
class Store : public std::enable_shared_from_this<Store>, public virtual StoreConfig
|
||
{
|
||
public:
|
||
|
||
typedef std::map<std::string, std::string> Params;
|
||
|
||
protected:
|
||
|
||
struct PathInfoCacheValue {
|
||
|
||
// Time of cache entry creation or update
|
||
std::chrono::time_point<std::chrono::steady_clock> time_point = std::chrono::steady_clock::now();
|
||
|
||
// Null if missing
|
||
std::shared_ptr<const ValidPathInfo> value;
|
||
|
||
// Whether the value is valid as a cache entry. The path may not exist.
|
||
bool isKnownNow();
|
||
|
||
// Past tense, because a path can only be assumed to exists when
|
||
// isKnownNow() && didExist()
|
||
inline bool didExist() {
|
||
return value != nullptr;
|
||
}
|
||
};
|
||
|
||
struct State
|
||
{
|
||
// FIXME: fix key
|
||
LRUCache<std::string, PathInfoCacheValue> pathInfoCache;
|
||
};
|
||
|
||
Sync<State> state;
|
||
|
||
std::shared_ptr<NarInfoDiskCache> diskCache;
|
||
|
||
Store(const Params & params);
|
||
|
||
public:
|
||
/**
|
||
* Perform any necessary effectful operation to make the store up and
|
||
* running
|
||
*/
|
||
virtual void init() {};
|
||
|
||
virtual ~Store() { }
|
||
|
||
virtual std::string getUri() = 0;
|
||
|
||
StorePath parseStorePath(std::string_view path) const;
|
||
|
||
std::optional<StorePath> maybeParseStorePath(std::string_view path) const;
|
||
|
||
std::string printStorePath(const StorePath & path) const;
|
||
|
||
// FIXME: remove
|
||
StorePathSet parseStorePathSet(const PathSet & paths) const;
|
||
|
||
PathSet printStorePathSet(const StorePathSet & path) const;
|
||
|
||
/* 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 string & s);
|
||
|
||
/* Display a set of paths in human-readable form (i.e., between quotes
|
||
and separated by commas). */
|
||
std::string showPaths(const StorePathSet & paths);
|
||
|
||
/* Return true if ‘path’ is in the Nix store (but not the Nix
|
||
store itself). */
|
||
bool isInStore(const Path & path) const;
|
||
|
||
/* Return true if ‘path’ is a store path, i.e. a direct child of
|
||
the Nix store. */
|
||
bool isStorePath(std::string_view path) const;
|
||
|
||
/* Split a path like /nix/store/<hash>-<name>/<bla> into
|
||
/nix/store/<hash>-<name> and /<bla>. */
|
||
std::pair<StorePath, Path> toStorePath(const Path & path) const;
|
||
|
||
/* Follow symlinks until we end up with a path in the Nix store. */
|
||
Path followLinksToStore(std::string_view path) const;
|
||
|
||
/* Same as followLinksToStore(), but apply toStorePath() to the
|
||
result. */
|
||
StorePath followLinksToStorePath(std::string_view path) const;
|
||
|
||
StorePathWithOutputs followLinksToStorePathWithOutputs(std::string_view path) const;
|
||
|
||
/* Constructs a unique store path name. */
|
||
StorePath makeStorePath(std::string_view type,
|
||
std::string_view hash, std::string_view name) const;
|
||
StorePath makeStorePath(std::string_view type,
|
||
const Hash & hash, std::string_view name) const;
|
||
|
||
StorePath makeOutputPath(std::string_view id,
|
||
const Hash & hash, std::string_view name) const;
|
||
|
||
StorePath makeFixedOutputPath(FileIngestionMethod method,
|
||
const Hash & hash, std::string_view name,
|
||
const StorePathSet & references = {},
|
||
bool hasSelfReference = false) const;
|
||
|
||
StorePath makeTextPath(std::string_view name, const Hash & hash,
|
||
const StorePathSet & references = {}) const;
|
||
|
||
StorePath makeFixedOutputPathFromCA(std::string_view name, ContentAddress ca,
|
||
const StorePathSet & references = {},
|
||
bool hasSelfReference = false) const;
|
||
|
||
/* This is the preparatory part of addToStore(); it computes the
|
||
store path to which srcPath is to be copied. Returns the store
|
||
path and the cryptographic hash of the contents of srcPath. */
|
||
std::pair<StorePath, Hash> computeStorePathForPath(std::string_view name,
|
||
const Path & srcPath, FileIngestionMethod method = FileIngestionMethod::Recursive,
|
||
HashType hashAlgo = htSHA256, PathFilter & filter = defaultPathFilter) const;
|
||
|
||
/* Preparatory part of addTextToStore().
|
||
|
||
!!! Computation of the path should take the references given to
|
||
addTextToStore() into account, otherwise we have a (relatively
|
||
minor) security hole: a caller can register a source file with
|
||
bogus references. If there are too many references, the path may
|
||
not be garbage collected when it has to be (not really a problem,
|
||
the caller could create a root anyway), or it may be garbage
|
||
collected when it shouldn't be (more serious).
|
||
|
||
Hashing the references would solve this (bogus references would
|
||
simply yield a different store path, so other users wouldn't be
|
||
affected), but it has some backwards compatibility issues (the
|
||
hashing scheme changes), so I'm not doing that for now. */
|
||
StorePath computeStorePathForText(const string & name, const string & s,
|
||
const StorePathSet & references) const;
|
||
|
||
/* Check whether a path is valid. */
|
||
bool isValidPath(const StorePath & path);
|
||
|
||
protected:
|
||
|
||
virtual bool isValidPathUncached(const StorePath & path);
|
||
|
||
public:
|
||
|
||
/* Query which of the given paths is valid. Optionally, try to
|
||
substitute missing paths. */
|
||
virtual StorePathSet queryValidPaths(const StorePathSet & paths,
|
||
SubstituteFlag maybeSubstitute = NoSubstitute);
|
||
|
||
/* Query the set of all valid paths. Note that for some store
|
||
backends, the name part of store paths may be replaced by 'x'
|
||
(i.e. you'll get /nix/store/<hash>-x rather than
|
||
/nix/store/<hash>-<name>). Use queryPathInfo() to obtain the
|
||
full store path. FIXME: should return a set of
|
||
std::variant<StorePath, HashPart> to get rid of this hack. */
|
||
virtual StorePathSet queryAllValidPaths()
|
||
{ unsupported("queryAllValidPaths"); }
|
||
|
||
constexpr static const char * MissingName = "x";
|
||
|
||
/* Query information about a valid path. It is permitted to omit
|
||
the name part of the store path. */
|
||
ref<const ValidPathInfo> queryPathInfo(const StorePath & path);
|
||
|
||
/* Asynchronous version of queryPathInfo(). */
|
||
void queryPathInfo(const StorePath & path,
|
||
Callback<ref<const ValidPathInfo>> callback) noexcept;
|
||
|
||
protected:
|
||
|
||
virtual void queryPathInfoUncached(const StorePath & path,
|
||
Callback<std::shared_ptr<const ValidPathInfo>> callback) noexcept = 0;
|
||
|
||
public:
|
||
|
||
/* Queries the set of incoming FS references for a store path.
|
||
The result is not cleared. */
|
||
virtual void queryReferrers(const StorePath & path, StorePathSet & referrers)
|
||
{ unsupported("queryReferrers"); }
|
||
|
||
/* 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 anymore.) */
|
||
virtual StorePathSet queryValidDerivers(const StorePath & path) { return {}; };
|
||
|
||
/* Query the outputs of the derivation denoted by `path'. */
|
||
virtual StorePathSet queryDerivationOutputs(const StorePath & path);
|
||
|
||
/* Query the mapping outputName => outputPath for the given derivation. All
|
||
outputs are mentioned so ones mising the mapping are mapped to
|
||
`std::nullopt`. */
|
||
virtual std::map<std::string, std::optional<StorePath>> queryPartialDerivationOutputMap(const StorePath & path)
|
||
{ unsupported("queryPartialDerivationOutputMap"); }
|
||
|
||
/* Query the mapping outputName=>outputPath for the given derivation.
|
||
Assume every output has a mapping and throw an exception otherwise. */
|
||
OutputPathMap queryDerivationOutputMap(const StorePath & path);
|
||
|
||
/* Query the full store path given the hash part of a valid store
|
||
path, or empty if the path doesn't exist. */
|
||
virtual std::optional<StorePath> queryPathFromHashPart(const std::string & hashPart) = 0;
|
||
|
||
/* Query which of the given paths have substitutes. */
|
||
virtual StorePathSet querySubstitutablePaths(const StorePathSet & paths) { return {}; };
|
||
|
||
/* Query substitute info (i.e. references, derivers and download
|
||
sizes) of a map of paths to their optional ca values. If a path
|
||
does not have substitute info, it's omitted from the resulting
|
||
‘infos’ map. */
|
||
virtual void querySubstitutablePathInfos(const StorePathCAMap & paths,
|
||
SubstitutablePathInfos & infos) { return; };
|
||
|
||
/* Import a path into the store. */
|
||
virtual void addToStore(const ValidPathInfo & info, Source & narSource,
|
||
RepairFlag repair = NoRepair, CheckSigsFlag checkSigs = CheckSigs) = 0;
|
||
|
||
/* Copy the contents of a path to the store and register the
|
||
validity the resulting path. The resulting path is returned.
|
||
The function object `filter' can be used to exclude files (see
|
||
libutil/archive.hh). */
|
||
virtual StorePath addToStore(const string & name, const Path & srcPath,
|
||
FileIngestionMethod method = FileIngestionMethod::Recursive, HashType hashAlgo = htSHA256,
|
||
PathFilter & filter = defaultPathFilter, RepairFlag repair = NoRepair);
|
||
|
||
/* Copy the contents of a path to the store and register the
|
||
validity the resulting path, using a constant amount of
|
||
memory. */
|
||
ValidPathInfo addToStoreSlow(std::string_view name, const Path & srcPath,
|
||
FileIngestionMethod method = FileIngestionMethod::Recursive, HashType hashAlgo = htSHA256,
|
||
std::optional<Hash> expectedCAHash = {});
|
||
|
||
/* Like addToStore(), but the contents of the path are contained
|
||
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 */
|
||
// FIXME: remove?
|
||
virtual StorePath addToStoreFromDump(Source & dump, const string & name,
|
||
FileIngestionMethod method = FileIngestionMethod::Recursive, HashType hashAlgo = htSHA256, RepairFlag repair = NoRepair)
|
||
{ unsupported("addToStoreFromDump"); }
|
||
|
||
/* Like addToStore, but the contents written to the output path is
|
||
a regular file containing the given string. */
|
||
virtual StorePath addTextToStore(const string & name, const string & s,
|
||
const StorePathSet & references, RepairFlag repair = NoRepair) = 0;
|
||
|
||
/* Write a NAR dump of a store path. */
|
||
virtual void narFromPath(const StorePath & path, Sink & sink) = 0;
|
||
|
||
/* For each path, if it's a derivation, build it. Building a
|
||
derivation means ensuring that the output paths are valid. If
|
||
they are already valid, this is a no-op. Otherwise, validity
|
||
can be reached in two ways. First, if the output paths is
|
||
substitutable, then build the path that way. Second, the
|
||
output paths can be created by running the builder, after
|
||
recursively building any sub-derivations. For inputs that are
|
||
not derivations, substitute them. */
|
||
virtual void buildPaths(
|
||
const std::vector<StorePathWithOutputs> & paths,
|
||
BuildMode buildMode = bmNormal);
|
||
|
||
/* Build a single non-materialized derivation (i.e. not from an
|
||
on-disk .drv file).
|
||
|
||
‘drvPath’ is used to deduplicate worker goals so it is imperative that
|
||
is correct. That said, it doesn't literally need to be store path that
|
||
would be calculated from writing this derivation to the store: it is OK
|
||
if it instead is that of a Derivation which would resolve to this (by
|
||
taking the outputs of it's input derivations and adding them as input
|
||
sources) such that the build time referenceable-paths are the same.
|
||
|
||
In the input-addressed case, we usually *do* use an "original"
|
||
unresolved derivations's path, as that is what will be used in the
|
||
`buildPaths` case. Also, the input-addressed output paths are verified
|
||
only by that contents of that specific unresolved derivation, so it is
|
||
nice to keep that information around so if the original derivation is
|
||
ever obtained later, it can be verified whether the trusted user in fact
|
||
used the proper output path.
|
||
|
||
In the content-addressed case, we want to always use the
|
||
resolved drv path calculated from the provided derivation. This serves
|
||
two purposes:
|
||
|
||
- It keeps the operation trustless, by ruling out a maliciously
|
||
invalid drv path corresponding to a non-resolution-equivalent
|
||
derivation.
|
||
|
||
- For the floating case in particular, it ensures that the derivation
|
||
to output mapping respects the resolution equivalence relation, so
|
||
one cannot choose different resolution-equivalent derivations to
|
||
subvert dependency coherence (i.e. the property that one doesn't end
|
||
up with multiple different versions of dependencies without
|
||
explicitly choosing to allow it).
|
||
*/
|
||
virtual BuildResult buildDerivation(const StorePath & drvPath, const BasicDerivation & drv,
|
||
BuildMode buildMode = bmNormal) = 0;
|
||
|
||
/* Ensure that a path is valid. If it is not currently valid, it
|
||
may be made valid by running a substitute (if defined for the
|
||
path). */
|
||
virtual void ensurePath(const StorePath & path) = 0;
|
||
|
||
/* Add a store path as a temporary root of the garbage collector.
|
||
The root disappears as soon as we exit. */
|
||
virtual void addTempRoot(const StorePath & path)
|
||
{ unsupported("addTempRoot"); }
|
||
|
||
/* 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)
|
||
{ unsupported("addIndirectRoot"); }
|
||
|
||
/* Acquire the global GC lock, then immediately release it. This
|
||
function must be called after registering a new permanent root,
|
||
but before exiting. Otherwise, it is possible that a running
|
||
garbage collector doesn't see the new root and deletes the
|
||
stuff we've just built. By acquiring the lock briefly, we
|
||
ensure that either:
|
||
|
||
- The collector is already running, and so we block until the
|
||
collector is finished. The collector will know about our
|
||
*temporary* locks, which should include whatever it is we
|
||
want to register as a permanent lock.
|
||
|
||
- The collector isn't running, or it's just started but hasn't
|
||
acquired the GC lock yet. In that case we get and release
|
||
the lock right away, then exit. The collector scans the
|
||
permanent root and sees ours.
|
||
|
||
In either case the permanent root is seen by the collector. */
|
||
virtual void syncWithGC() { };
|
||
|
||
/* 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)
|
||
{ unsupported("findRoots"); }
|
||
|
||
/* Perform a garbage collection. */
|
||
virtual void collectGarbage(const GCOptions & options, GCResults & results)
|
||
{ unsupported("collectGarbage"); }
|
||
|
||
/* 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'. */
|
||
string makeValidityRegistration(const StorePathSet & paths,
|
||
bool showDerivers, bool showHash);
|
||
|
||
/* Write a JSON representation of store path metadata, such as the
|
||
hash and the references. If ‘includeImpureInfo’ is true,
|
||
variable elements such as the registration time are
|
||
included. If ‘showClosureSize’ is true, the closure size of
|
||
each path is included. */
|
||
void pathInfoToJSON(JSONPlaceholder & jsonOut, const StorePathSet & storePaths,
|
||
bool includeImpureInfo, bool showClosureSize,
|
||
Base hashBase = Base32,
|
||
AllowInvalidFlag allowInvalid = DisallowInvalid);
|
||
|
||
/* Return the size of the closure of the specified path, that is,
|
||
the sum of the size of the NAR serialisation of each path in
|
||
the closure. */
|
||
std::pair<uint64_t, uint64_t> getClosureSize(const StorePath & storePath);
|
||
|
||
/* Optimise the disk space usage of the Nix store by hard-linking files
|
||
with the same contents. */
|
||
virtual void optimiseStore() { };
|
||
|
||
/* Check the integrity of the Nix store. Returns true if errors
|
||
remain. */
|
||
virtual bool verifyStore(bool checkContents, RepairFlag repair = NoRepair) { return false; };
|
||
|
||
/* Return an object to access files in the Nix store. */
|
||
virtual ref<FSAccessor> getFSAccessor()
|
||
{ unsupported("getFSAccessor"); }
|
||
|
||
/* Add signatures to the specified store path. The signatures are
|
||
not verified. */
|
||
virtual void addSignatures(const StorePath & storePath, const StringSet & sigs)
|
||
{ unsupported("addSignatures"); }
|
||
|
||
/* Utility functions. */
|
||
|
||
/* Read a derivation, after ensuring its existence through
|
||
ensurePath(). */
|
||
Derivation derivationFromPath(const StorePath & drvPath);
|
||
|
||
/* Read a derivation (which must already be valid). */
|
||
Derivation readDerivation(const StorePath & drvPath);
|
||
|
||
/* Place in `out' 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. If
|
||
`flipDirection' is 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
|
||
returned. */
|
||
virtual void computeFSClosure(const StorePathSet & paths,
|
||
StorePathSet & out, bool flipDirection = false,
|
||
bool includeOutputs = false, bool includeDerivers = false);
|
||
|
||
void computeFSClosure(const StorePath & path,
|
||
StorePathSet & out, bool flipDirection = false,
|
||
bool includeOutputs = false, bool includeDerivers = false);
|
||
|
||
/* Given a set of paths that are to be built, return the set of
|
||
derivations that will be built, and the set of output paths
|
||
that will be substituted. */
|
||
virtual void queryMissing(const std::vector<StorePathWithOutputs> & targets,
|
||
StorePathSet & willBuild, StorePathSet & willSubstitute, StorePathSet & unknown,
|
||
uint64_t & downloadSize, uint64_t & narSize);
|
||
|
||
/* Sort a set of paths topologically under the references
|
||
relation. If p refers to q, then p precedes q in this list. */
|
||
StorePaths topoSortPaths(const StorePathSet & paths);
|
||
|
||
/* Export multiple paths in the format expected by ‘nix-store
|
||
--import’. */
|
||
void exportPaths(const StorePathSet & paths, Sink & sink);
|
||
|
||
void exportPath(const StorePath & path, Sink & sink);
|
||
|
||
/* Import a sequence of NAR dumps created by exportPaths() into
|
||
the Nix store. Optionally, the contents of the NARs are
|
||
preloaded into the specified FS accessor to speed up subsequent
|
||
access. */
|
||
StorePaths importPaths(Source & source, CheckSigsFlag checkSigs = CheckSigs);
|
||
|
||
struct Stats
|
||
{
|
||
std::atomic<uint64_t> narInfoRead{0};
|
||
std::atomic<uint64_t> narInfoReadAverted{0};
|
||
std::atomic<uint64_t> narInfoMissing{0};
|
||
std::atomic<uint64_t> narInfoWrite{0};
|
||
std::atomic<uint64_t> pathInfoCacheSize{0};
|
||
std::atomic<uint64_t> narRead{0};
|
||
std::atomic<uint64_t> narReadBytes{0};
|
||
std::atomic<uint64_t> narReadCompressedBytes{0};
|
||
std::atomic<uint64_t> narWrite{0};
|
||
std::atomic<uint64_t> narWriteAverted{0};
|
||
std::atomic<uint64_t> narWriteBytes{0};
|
||
std::atomic<uint64_t> narWriteCompressedBytes{0};
|
||
std::atomic<uint64_t> narWriteCompressionTimeMs{0};
|
||
};
|
||
|
||
const Stats & getStats();
|
||
|
||
/* Return the build log of the specified store path, if available,
|
||
or null otherwise. */
|
||
virtual std::shared_ptr<std::string> getBuildLog(const StorePath & path)
|
||
{ return nullptr; }
|
||
|
||
/* Hack to allow long-running processes like hydra-queue-runner to
|
||
occasionally flush their path info cache. */
|
||
void clearPathInfoCache()
|
||
{
|
||
state.lock()->pathInfoCache.clear();
|
||
}
|
||
|
||
/* Establish a connection to the store, for store types that have
|
||
a notion of connection. Otherwise this is a no-op. */
|
||
virtual void connect() { };
|
||
|
||
/* Get the protocol version of this store or it's connection. */
|
||
virtual unsigned int getProtocol()
|
||
{
|
||
return 0;
|
||
};
|
||
|
||
virtual Path toRealPath(const Path & storePath)
|
||
{
|
||
return storePath;
|
||
}
|
||
|
||
Path toRealPath(const StorePath & storePath)
|
||
{
|
||
return toRealPath(printStorePath(storePath));
|
||
}
|
||
|
||
virtual void createUser(const std::string & userName, uid_t userId)
|
||
{ }
|
||
|
||
protected:
|
||
|
||
Stats stats;
|
||
|
||
/* Unsupported methods. */
|
||
[[noreturn]] void unsupported(const std::string & op)
|
||
{
|
||
throw Unsupported("operation '%s' is not supported by store '%s'", op, getUri());
|
||
}
|
||
|
||
};
|
||
|
||
struct LocalFSStoreConfig : virtual StoreConfig
|
||
{
|
||
using StoreConfig::StoreConfig;
|
||
// FIXME: the (StoreConfig*) cast works around a bug in gcc that causes
|
||
// it to omit the call to the Setting constructor. Clang works fine
|
||
// either way.
|
||
const PathSetting rootDir{(StoreConfig*) this, true, "",
|
||
"root", "directory prefixed to all other paths"};
|
||
const PathSetting stateDir{(StoreConfig*) this, false,
|
||
rootDir != "" ? rootDir + "/nix/var/nix" : settings.nixStateDir,
|
||
"state", "directory where Nix will store state"};
|
||
const PathSetting logDir{(StoreConfig*) this, false,
|
||
rootDir != "" ? rootDir + "/nix/var/log/nix" : settings.nixLogDir,
|
||
"log", "directory where Nix will store state"};
|
||
};
|
||
|
||
class LocalFSStore : public virtual Store, public virtual LocalFSStoreConfig
|
||
{
|
||
public:
|
||
|
||
const static string drvsLogDir;
|
||
|
||
LocalFSStore(const Params & params);
|
||
|
||
void narFromPath(const StorePath & path, Sink & sink) override;
|
||
ref<FSAccessor> getFSAccessor() override;
|
||
|
||
/* Register a permanent GC root. */
|
||
Path addPermRoot(const StorePath & storePath, const Path & gcRoot);
|
||
|
||
virtual Path getRealStoreDir() { return storeDir; }
|
||
|
||
Path toRealPath(const Path & storePath) override
|
||
{
|
||
assert(isInStore(storePath));
|
||
return getRealStoreDir() + "/" + std::string(storePath, storeDir.size() + 1);
|
||
}
|
||
|
||
std::shared_ptr<std::string> getBuildLog(const StorePath & path) override;
|
||
};
|
||
|
||
|
||
/* Copy a path from one store to another. */
|
||
void copyStorePath(ref<Store> srcStore, ref<Store> dstStore,
|
||
const StorePath & storePath, RepairFlag repair = NoRepair, CheckSigsFlag checkSigs = CheckSigs);
|
||
|
||
|
||
/* Copy store paths from one store to another. The paths may be copied
|
||
in parallel. They are copied in a topologically sorted order (i.e.
|
||
if A is a reference of B, then A is copied before B), but the set
|
||
of store paths is not automatically closed; use copyClosure() for
|
||
that. Returns a map of what each path was copied to the dstStore
|
||
as. */
|
||
std::map<StorePath, StorePath> copyPaths(ref<Store> srcStore, ref<Store> dstStore,
|
||
const StorePathSet & storePaths,
|
||
RepairFlag repair = NoRepair,
|
||
CheckSigsFlag checkSigs = CheckSigs,
|
||
SubstituteFlag substitute = NoSubstitute);
|
||
|
||
|
||
/* Copy the closure of the specified paths from one store to another. */
|
||
void copyClosure(ref<Store> srcStore, ref<Store> dstStore,
|
||
const StorePathSet & storePaths,
|
||
RepairFlag repair = NoRepair,
|
||
CheckSigsFlag checkSigs = CheckSigs,
|
||
SubstituteFlag substitute = NoSubstitute);
|
||
|
||
|
||
/* Remove the temporary roots file for this process. Any temporary
|
||
root becomes garbage after this point unless it has been registered
|
||
as a (permanent) root. */
|
||
void removeTempRoots();
|
||
|
||
|
||
/* Return a Store object to access the Nix store denoted by
|
||
‘uri’ (slight misnomer...). Supported values are:
|
||
|
||
* ‘local’: The Nix store in /nix/store and database in
|
||
/nix/var/nix/db, accessed directly.
|
||
|
||
* ‘daemon’: The Nix store accessed via a Unix domain socket
|
||
connection to nix-daemon.
|
||
|
||
* ‘unix://<path>’: The Nix store accessed via a Unix domain socket
|
||
connection to nix-daemon, with the socket located at <path>.
|
||
|
||
* ‘auto’ or ‘’: Equivalent to ‘local’ or ‘daemon’ depending on
|
||
whether the user has write access to the local Nix
|
||
store/database.
|
||
|
||
* ‘file://<path>’: A binary cache stored in <path>.
|
||
|
||
* ‘https://<path>’: A binary cache accessed via HTTP.
|
||
|
||
* ‘s3://<path>’: A writable binary cache stored on Amazon's Simple
|
||
Storage Service.
|
||
|
||
* ‘ssh://[user@]<host>’: A remote Nix store accessed by running
|
||
‘nix-store --serve’ via SSH.
|
||
|
||
You can pass parameters to the store implementation by appending
|
||
‘?key=value&key=value&...’ to the URI.
|
||
*/
|
||
ref<Store> openStore(const std::string & uri = settings.storeUri.get(),
|
||
const Store::Params & extraParams = Store::Params());
|
||
|
||
|
||
/* Return the default substituter stores, defined by the
|
||
‘substituters’ option and various legacy options. */
|
||
std::list<ref<Store>> getDefaultSubstituters();
|
||
|
||
struct StoreFactory
|
||
{
|
||
std::set<std::string> uriSchemes;
|
||
std::function<std::shared_ptr<Store> (const std::string & scheme, const std::string & uri, const Store::Params & params)> create;
|
||
std::function<std::shared_ptr<StoreConfig> ()> getConfig;
|
||
};
|
||
struct Implementations
|
||
{
|
||
static std::vector<StoreFactory> * registered;
|
||
|
||
template<typename T, typename TConfig>
|
||
static void add()
|
||
{
|
||
if (!registered) registered = new std::vector<StoreFactory>();
|
||
StoreFactory factory{
|
||
.uriSchemes = T::uriSchemes(),
|
||
.create =
|
||
([](const std::string & scheme, const std::string & uri, const Store::Params & params)
|
||
-> std::shared_ptr<Store>
|
||
{ return std::make_shared<T>(scheme, uri, params); }),
|
||
.getConfig =
|
||
([]()
|
||
-> std::shared_ptr<StoreConfig>
|
||
{ return std::make_shared<TConfig>(StringMap({})); })
|
||
};
|
||
registered->push_back(factory);
|
||
}
|
||
};
|
||
|
||
template<typename T, typename TConfig>
|
||
struct RegisterStoreImplementation
|
||
{
|
||
RegisterStoreImplementation()
|
||
{
|
||
Implementations::add<T, TConfig>();
|
||
}
|
||
};
|
||
|
||
|
||
/* Display a set of paths in human-readable form (i.e., between quotes
|
||
and separated by commas). */
|
||
string showPaths(const PathSet & paths);
|
||
|
||
|
||
std::optional<ValidPathInfo> decodeValidPathInfo(
|
||
const Store & store,
|
||
std::istream & str,
|
||
std::optional<HashResult> hashGiven = std::nullopt);
|
||
|
||
/* Split URI into protocol+hierarchy part and its parameter set. */
|
||
std::pair<std::string, Store::Params> splitUriAndParams(const std::string & uri);
|
||
|
||
std::optional<ContentAddress> getDerivationCA(const BasicDerivation & drv);
|
||
|
||
}
|