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Merge pull request #8172 from edolstra/source-path

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Backport `SourcePath` from the lazy-trees branch
This commit is contained in:
Eelco Dolstra 2023-04-24 14:05:51 +02:00 committed by GitHub
parent 7474a90db6 5d3f6dbf59
commit 249ce28332
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GPG key ID: 4AEE18F83AFDEB23
37 changed files with 608 additions and 290 deletions
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10
src/libcmd/common-eval-args.cc
View file

@ -153,7 +153,7 @@ Bindings * MixEvalArgs::getAutoArgs(EvalState & state)
for (auto & i : autoArgs) {
auto v = state.allocValue();
if (i.second[0] == 'E')
state.mkThunk_(*v, state.parseExprFromString(i.second.substr(1), absPath(".")));
state.mkThunk_(*v, state.parseExprFromString(i.second.substr(1), state.rootPath(CanonPath::fromCwd())));
else
v->mkString(((std::string_view) i.second).substr(1));
res.insert(state.symbols.create(i.first), v);
@ -161,19 +161,19 @@ Bindings * MixEvalArgs::getAutoArgs(EvalState & state)
return res.finish();
}
Path lookupFileArg(EvalState & state, std::string_view s)
SourcePath lookupFileArg(EvalState & state, std::string_view s)
{
if (EvalSettings::isPseudoUrl(s)) {
auto storePath = fetchers::downloadTarball(
state.store, EvalSettings::resolvePseudoUrl(s), "source", false).first.storePath;
return state.store->toRealPath(storePath);
return state.rootPath(CanonPath(state.store->toRealPath(storePath)));
}
else if (hasPrefix(s, "flake:")) {
experimentalFeatureSettings.require(Xp::Flakes);
auto flakeRef = parseFlakeRef(std::string(s.substr(6)), {}, true, false);
auto storePath = flakeRef.resolve(state.store).fetchTree(state.store).first.storePath;
return state.store->toRealPath(storePath);
return state.rootPath(CanonPath(state.store->toRealPath(storePath)));
}
else if (s.size() > 2 && s.at(0) == '<' && s.at(s.size() - 1) == '>') {
@ -182,7 +182,7 @@ Path lookupFileArg(EvalState & state, std::string_view s)
}
else
return absPath(std::string(s));
return state.rootPath(CanonPath::fromCwd(s));
}
}

3
src/libcmd/common-eval-args.hh
View file

@ -8,6 +8,7 @@ namespace nix {
class Store;
class EvalState;
class Bindings;
struct SourcePath;
struct MixEvalArgs : virtual Args
{
@ -25,6 +26,6 @@ private:
std::map<std::string, std::string> autoArgs;
};
Path lookupFileArg(EvalState & state, std::string_view s);
SourcePath lookupFileArg(EvalState & state, std::string_view s);
}

7
src/libcmd/editor-for.cc
View file

@ -3,8 +3,11 @@
namespace nix {
Strings editorFor(const Path & file, uint32_t line)
Strings editorFor(const SourcePath & file, uint32_t line)
{
auto path = file.getPhysicalPath();
if (!path)
throw Error("cannot open '%s' in an editor because it has no physical path", file);
auto editor = getEnv("EDITOR").value_or("cat");
auto args = tokenizeString<Strings>(editor);
if (line > 0 && (
@ -13,7 +16,7 @@ Strings editorFor(const Path & file, uint32_t line)
editor.find("vim") != std::string::npos ||
editor.find("kak") != std::string::npos))
args.push_back(fmt("+%d", line));
args.push_back(file);
args.push_back(path->abs());
return args;
}

3
src/libcmd/editor-for.hh
View file

@ -2,6 +2,7 @@
///@file
#include "types.hh"
#include "input-accessor.hh"
namespace nix {
@ -9,6 +10,6 @@ namespace nix {
* Helper function to generate args that invoke $EDITOR on
* filename:lineno.
*/
Strings editorFor(const Path & file, uint32_t line);
Strings editorFor(const SourcePath & file, uint32_t line);
}

3
src/libcmd/installable-flake.cc
View file

@ -96,8 +96,7 @@ DerivedPathsWithInfo InstallableFlake::toDerivedPaths()
auto v = attr->forceValue();
if (v.type() == nPath) {
NixStringContext context;
auto storePath = state->copyPathToStore(context, Path(v.path));
auto storePath = v.path().fetchToStore(state->store);
return {{
.path = DerivedPath::Opaque {
.path = std::move(storePath),

2
src/libcmd/installables.cc
View file

@ -449,7 +449,7 @@ Installables SourceExprCommand::parseInstallables(
else if (file)
state->evalFile(lookupFileArg(*state, *file), *vFile);
else {
auto e = state->parseExprFromString(*expr, absPath("."));
auto e = state->parseExprFromString(*expr, state->rootPath(CanonPath::fromCwd()));
state->eval(e, *vFile);
}

12
src/libcmd/repl.cc
View file

@ -55,8 +55,6 @@ struct NixRepl
, gc
#endif
{
std::string curDir;
size_t debugTraceIndex;
Strings loadedFiles;
@ -114,7 +112,6 @@ NixRepl::NixRepl(const Strings & searchPath, nix::ref<Store> store, ref<EvalStat
, staticEnv(new StaticEnv(false, state->staticBaseEnv.get()))
, historyFile(getDataDir() + "/nix/repl-history")
{
curDir = absPath(".");
}
@ -594,14 +591,14 @@ bool NixRepl::processLine(std::string line)
Value v;
evalString(arg, v);
const auto [path, line] = [&] () -> std::pair<Path, uint32_t> {
const auto [path, line] = [&] () -> std::pair<SourcePath, uint32_t> {
if (v.type() == nPath || v.type() == nString) {
NixStringContext context;
auto path = state->coerceToPath(noPos, v, context, "while evaluating the filename to edit");
return {path, 0};
} else if (v.isLambda()) {
auto pos = state->positions[v.lambda.fun->pos];
if (auto path = std::get_if<Path>(&pos.origin))
if (auto path = std::get_if<SourcePath>(&pos.origin))
return {*path, pos.line};
else
throw Error("'%s' cannot be shown in an editor", pos);
@ -876,8 +873,7 @@ void NixRepl::addVarToScope(const Symbol name, Value & v)
Expr * NixRepl::parseString(std::string s)
{
Expr * e = state->parseExprFromString(std::move(s), curDir, staticEnv);
return e;
return state->parseExprFromString(std::move(s), state->rootPath(CanonPath::fromCwd()), staticEnv);
}
@ -925,7 +921,7 @@ std::ostream & NixRepl::printValue(std::ostream & str, Value & v, unsigned int m
break;
case nPath:
str << ANSI_GREEN << v.path << ANSI_NORMAL; // !!! escaping?
str << ANSI_GREEN << v.path().to_string() << ANSI_NORMAL; // !!! escaping?
break;
case nNull:

26
src/libexpr/attr-path.cc
View file

@ -106,7 +106,7 @@ std::pair<Value *, PosIdx> findAlongAttrPath(EvalState & state, const std::strin
}
std::pair<std::string, uint32_t> findPackageFilename(EvalState & state, Value & v, std::string what)
std::pair<SourcePath, uint32_t> findPackageFilename(EvalState & state, Value & v, std::string what)
{
Value * v2;
try {
@ -118,21 +118,25 @@ std::pair<std::string, uint32_t> findPackageFilename(EvalState & state, Value &
// FIXME: is it possible to extract the Pos object instead of doing this
// toString + parsing?
auto pos = state.forceString(*v2, noPos, "while evaluating the 'meta.position' attribute of a derivation");
NixStringContext context;
auto path = state.coerceToPath(noPos, *v2, context, "while evaluating the 'meta.position' attribute of a derivation");
auto colon = pos.rfind(':');
if (colon == std::string::npos)
throw ParseError("cannot parse meta.position attribute '%s'", pos);
auto fn = path.path.abs();
auto fail = [fn]() {
throw ParseError("cannot parse 'meta.position' attribute '%s'", fn);
};
std::string filename(pos, 0, colon);
unsigned int lineno;
try {
lineno = std::stoi(std::string(pos, colon + 1, std::string::npos));
auto colon = fn.rfind(':');
if (colon == std::string::npos) fail();
std::string filename(fn, 0, colon);
auto lineno = std::stoi(std::string(fn, colon + 1, std::string::npos));
return {CanonPath(fn.substr(0, colon)), lineno};
} catch (std::invalid_argument & e) {
throw ParseError("cannot parse line number '%s'", pos);
fail();
abort();
}
return { std::move(filename), lineno };
}

2
src/libexpr/attr-path.hh
View file

@ -20,7 +20,7 @@ std::pair<Value *, PosIdx> findAlongAttrPath(
/**
* 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::pair<SourcePath, uint32_t> findPackageFilename(EvalState & state, Value & v, std::string what);
std::vector<Symbol> parseAttrPath(EvalState & state, std::string_view s);

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

@ -442,8 +442,10 @@ Value & AttrCursor::forceValue()
if (v.type() == nString)
cachedValue = {root->db->setString(getKey(), v.string.s, v.string.context),
string_t{v.string.s, {}}};
else if (v.type() == nPath)
cachedValue = {root->db->setString(getKey(), v.path), string_t{v.path, {}}};
else if (v.type() == nPath) {
auto path = v.path().path;
cachedValue = {root->db->setString(getKey(), path.abs()), string_t{path.abs(), {}}};
}
else if (v.type() == nBool)
cachedValue = {root->db->setBool(getKey(), v.boolean), v.boolean};
else if (v.type() == nInt)
@ -580,7 +582,7 @@ std::string AttrCursor::getString()
if (v.type() != nString && v.type() != nPath)
root->state.error("'%s' is not a string but %s", getAttrPathStr()).debugThrow<TypeError>();
return v.type() == nString ? v.string.s : v.path;
return v.type() == nString ? v.string.s : v.path().to_string();
}
string_t AttrCursor::getStringWithContext()
@ -624,7 +626,7 @@ string_t AttrCursor::getStringWithContext()
copyContext(v, context);
return {v.string.s, std::move(context)};
} else if (v.type() == nPath)
return {v.path, {}};
return {v.path().to_string(), {}};
else
root->state.error("'%s' is not a string but %s", getAttrPathStr()).debugThrow<TypeError>();
}

99
src/libexpr/eval.cc
View file

@ -111,7 +111,7 @@ void Value::print(const SymbolTable & symbols, std::ostream & str,
printLiteralString(str, string.s);
break;
case tPath:
str << path; // !!! escaping?
str << path().to_string(); // !!! escaping?
break;
case tNull:
str << "null";
@ -535,6 +535,7 @@ EvalState::EvalState(
, sOutputSpecified(symbols.create("outputSpecified"))
, repair(NoRepair)
, emptyBindings(0)
, derivationInternal(rootPath(CanonPath("/builtin/derivation.nix")))
, store(store)
, buildStore(buildStore ? buildStore : store)
, debugRepl(nullptr)
@ -612,11 +613,11 @@ void EvalState::allowAndSetStorePathString(const StorePath & storePath, Value &
mkStorePathString(storePath, v);
}
Path EvalState::checkSourcePath(const Path & path_)
SourcePath EvalState::checkSourcePath(const SourcePath & path_)
{
if (!allowedPaths) return path_;
auto i = resolvedPaths.find(path_);
auto i = resolvedPaths.find(path_.path.abs());
if (i != resolvedPaths.end())
return i->second;
@ -626,9 +627,9 @@ Path EvalState::checkSourcePath(const Path & path_)
* attacker can't append ../../... to a path that would be in allowedPaths
* and thus leak symlink targets.
*/
Path abspath = canonPath(path_);
Path abspath = canonPath(path_.path.abs());
if (hasPrefix(abspath, corepkgsPrefix)) return abspath;
if (hasPrefix(abspath, corepkgsPrefix)) return CanonPath(abspath);
for (auto & i : *allowedPaths) {
if (isDirOrInDir(abspath, i)) {
@ -646,11 +647,11 @@ Path EvalState::checkSourcePath(const Path & path_)
/* Resolve symlinks. */
debug("checking access to '%s'", abspath);
Path path = canonPath(abspath, true);
SourcePath path = CanonPath(canonPath(abspath, true));
for (auto & i : *allowedPaths) {
if (isDirOrInDir(path, i)) {
resolvedPaths[path_] = path;
if (isDirOrInDir(path.path.abs(), i)) {
resolvedPaths.insert_or_assign(path_.path.abs(), path);
return path;
}
}
@ -678,12 +679,12 @@ void EvalState::checkURI(const std::string & uri)
/* If the URI is a path, then check it against allowedPaths as
well. */
if (hasPrefix(uri, "/")) {
checkSourcePath(uri);
checkSourcePath(CanonPath(uri));
return;
}
if (hasPrefix(uri, "file://")) {
checkSourcePath(std::string(uri, 7));
checkSourcePath(CanonPath(std::string(uri, 7)));
return;
}
@ -968,9 +969,9 @@ void Value::mkStringMove(const char * s, const NixStringContext & context)
}
void Value::mkPath(std::string_view s)
void Value::mkPath(const SourcePath & path)
{
mkPath(makeImmutableString(s));
mkPath(makeImmutableString(path.path.abs()));
}
@ -1026,9 +1027,9 @@ void EvalState::mkThunk_(Value & v, Expr * expr)
void EvalState::mkPos(Value & v, PosIdx p)
{
auto pos = positions[p];
if (auto path = std::get_if<Path>(&pos.origin)) {
if (auto path = std::get_if<SourcePath>(&pos.origin)) {
auto attrs = buildBindings(3);
attrs.alloc(sFile).mkString(*path);
attrs.alloc(sFile).mkString(path->path.abs());
attrs.alloc(sLine).mkInt(pos.line);
attrs.alloc(sColumn).mkInt(pos.column);
v.mkAttrs(attrs);
@ -1094,7 +1095,7 @@ Value * ExprPath::maybeThunk(EvalState & state, Env & env)
}
void EvalState::evalFile(const Path & path_, Value & v, bool mustBeTrivial)
void EvalState::evalFile(const SourcePath & path_, Value & v, bool mustBeTrivial)
{
auto path = checkSourcePath(path_);
@ -1104,7 +1105,7 @@ void EvalState::evalFile(const Path & path_, Value & v, bool mustBeTrivial)
return;
}
Path resolvedPath = resolveExprPath(path);
auto resolvedPath = resolveExprPath(path);
if ((i = fileEvalCache.find(resolvedPath)) != fileEvalCache.end()) {
v = i->second;
return;
@ -1132,8 +1133,8 @@ void EvalState::resetFileCache()
void EvalState::cacheFile(
const Path & path,
const Path & resolvedPath,
const SourcePath & path,
const SourcePath & resolvedPath,
Expr * e,
Value & v,
bool mustBeTrivial)
@ -1147,7 +1148,7 @@ void EvalState::cacheFile(
*e,
this->baseEnv,
e->getPos() ? static_cast<std::shared_ptr<AbstractPos>>(positions[e->getPos()]) : nullptr,
"while evaluating the file '%1%':", resolvedPath)
"while evaluating the file '%1%':", resolvedPath.to_string())
: nullptr;
// Enforce that 'flake.nix' is a direct attrset, not a
@ -1157,7 +1158,7 @@ void EvalState::cacheFile(
error("file '%s' must be an attribute set", path).debugThrow<EvalError>();
eval(e, v);
} catch (Error & e) {
addErrorTrace(e, "while evaluating the file '%1%':", resolvedPath);
addErrorTrace(e, "while evaluating the file '%1%':", resolvedPath.to_string());
throw;
}
@ -1418,8 +1419,8 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v)
} catch (Error & e) {
if (pos2) {
auto pos2r = state.positions[pos2];
auto origin = std::get_if<Path>(&pos2r.origin);
if (!(origin && *origin == state.derivationNixPath))
auto origin = std::get_if<SourcePath>(&pos2r.origin);
if (!(origin && *origin == state.derivationInternal))
state.addErrorTrace(e, pos2, "while evaluating the attribute '%1%'",
showAttrPath(state, env, attrPath));
}
@ -1992,7 +1993,7 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
else if (firstType == nPath) {
if (!context.empty())
state.error("a string that refers to a store path cannot be appended to a path").atPos(pos).withFrame(env, *this).debugThrow<EvalError>();
v.mkPath(canonPath(str()));
v.mkPath(CanonPath(canonPath(str())));
} else
v.mkStringMove(c_str(), context);
}
@ -2170,8 +2171,14 @@ std::optional<std::string> EvalState::tryAttrsToString(const PosIdx pos, Value &
return {};
}
BackedStringView EvalState::coerceToString(const PosIdx pos, Value &v, NixStringContext &context,
std::string_view errorCtx, bool coerceMore, bool copyToStore, bool canonicalizePath)
BackedStringView EvalState::coerceToString(
const PosIdx pos,
Value & v,
NixStringContext & context,
std::string_view errorCtx,
bool coerceMore,
bool copyToStore,
bool canonicalizePath)
{
forceValue(v, pos);
@ -2181,12 +2188,14 @@ BackedStringView EvalState::coerceToString(const PosIdx pos, Value &v, NixString
}
if (v.type() == nPath) {
BackedStringView path(PathView(v.path));
if (canonicalizePath)
path = canonPath(*path);
if (copyToStore)
path = store->printStorePath(copyPathToStore(context, std::move(path).toOwned()));
return path;
return
!canonicalizePath && !copyToStore
? // FIXME: hack to preserve path literals that end in a
// slash, as in /foo/${x}.
v._path
: copyToStore
? store->printStorePath(copyPathToStore(context, v.path()))
: std::string(v.path().path.abs());
}
if (v.type() == nAttrs) {
@ -2247,19 +2256,17 @@ BackedStringView EvalState::coerceToString(const PosIdx pos, Value &v, NixString
}
StorePath EvalState::copyPathToStore(NixStringContext & context, const Path & path)
StorePath EvalState::copyPathToStore(NixStringContext & context, const SourcePath & path)
{
if (nix::isDerivation(path))
if (nix::isDerivation(path.path.abs()))
error("file names are not allowed to end in '%1%'", drvExtension).debugThrow<EvalError>();
auto dstPath = [&]() -> StorePath
{
auto i = srcToStore.find(path);
if (i != srcToStore.end()) return i->second;
auto dstPath = settings.readOnlyMode
? store->computeStorePathForPath(std::string(baseNameOf(path)), checkSourcePath(path)).first
: store->addToStore(std::string(baseNameOf(path)), checkSourcePath(path), FileIngestionMethod::Recursive, htSHA256, defaultPathFilter, repair);
auto dstPath = i != srcToStore.end()
? i->second
: [&]() {
auto dstPath = path.fetchToStore(store, path.baseName(), nullptr, repair);
allowPath(dstPath);
srcToStore.insert_or_assign(path, dstPath);
printMsg(lvlChatty, "copied source '%1%' -> '%2%'", path, store->printStorePath(dstPath));
@ -2273,12 +2280,12 @@ StorePath EvalState::copyPathToStore(NixStringContext & context, const Path & pa
}
Path EvalState::coerceToPath(const PosIdx pos, Value & v, NixStringContext & context, std::string_view errorCtx)
SourcePath EvalState::coerceToPath(const PosIdx pos, Value & v, NixStringContext & context, std::string_view errorCtx)
{
auto path = coerceToString(pos, v, context, errorCtx, false, false, true).toOwned();
if (path == "" || path[0] != '/')
error("string '%1%' doesn't represent an absolute path", path).withTrace(pos, errorCtx).debugThrow<EvalError>();
return path;
return CanonPath(path);
}
@ -2321,7 +2328,7 @@ bool EvalState::eqValues(Value & v1, Value & v2, const PosIdx pos, std::string_v
return strcmp(v1.string.s, v2.string.s) == 0;
case nPath:
return strcmp(v1.path, v2.path) == 0;
return strcmp(v1._path, v2._path) == 0;
case nNull:
return true;
@ -2448,8 +2455,8 @@ void EvalState::printStats()
else
obj["name"] = nullptr;
if (auto pos = positions[fun->pos]) {
if (auto path = std::get_if<Path>(&pos.origin))
obj["file"] = *path;
if (auto path = std::get_if<SourcePath>(&pos.origin))
obj["file"] = path->to_string();
obj["line"] = pos.line;
obj["column"] = pos.column;
}
@ -2463,8 +2470,8 @@ void EvalState::printStats()
for (auto & i : attrSelects) {
json obj = json::object();
if (auto pos = positions[i.first]) {
if (auto path = std::get_if<Path>(&pos.origin))
obj["file"] = *path;
if (auto path = std::get_if<SourcePath>(&pos.origin))
obj["file"] = path->to_string();
obj["line"] = pos.line;
obj["column"] = pos.column;
}

63
src/libexpr/eval.hh
View file

@ -8,6 +8,7 @@
#include "symbol-table.hh"
#include "config.hh"
#include "experimental-features.hh"
#include "input-accessor.hh"
#include <map>
#include <optional>
@ -59,17 +60,11 @@ std::unique_ptr<ValMap> mapStaticEnvBindings(const SymbolTable & st, const Stati
void copyContext(const Value & v, NixStringContext & context);
/**
* Cache for calls to addToStore(); maps source paths to the store
* paths.
*/
typedef std::map<Path, StorePath> SrcToStore;
std::string printValue(const EvalState & state, const Value & v);
std::ostream & operator << (std::ostream & os, const ValueType t);
// FIXME: maybe change this to an std::variant<SourcePath, URL>.
typedef std::pair<std::string, std::string> SearchPathElem;
typedef std::list<SearchPathElem> SearchPath;
@ -137,8 +132,6 @@ public:
SymbolTable symbols;
PosTable positions;
static inline std::string derivationNixPath = "//builtin/derivation.nix";
const Symbol sWith, sOutPath, sDrvPath, sType, sMeta, sName, sValue,
sSystem, sOverrides, sOutputs, sOutputName, sIgnoreNulls,
sFile, sLine, sColumn, sFunctor, sToString,
@ -149,7 +142,6 @@ public:
sDescription, sSelf, sEpsilon, sStartSet, sOperator, sKey, sPath,
sPrefix,
sOutputSpecified;
Symbol sDerivationNix;
/**
* If set, force copying files to the Nix store even if they
@ -165,6 +157,8 @@ public:
Bindings emptyBindings;
const SourcePath derivationInternal;
/**
* Store used to materialise .drv files.
*/
@ -234,15 +228,18 @@ public:
}
private:
SrcToStore srcToStore;
/* Cache for calls to addToStore(); maps source paths to the store
paths. */
std::map<SourcePath, StorePath> srcToStore;
/**
* 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;
typedef std::map<SourcePath, Expr *, std::less<SourcePath>, traceable_allocator<std::pair<const SourcePath, Expr *>>> FileParseCache;
#else
typedef std::map<Path, Expr *> FileParseCache;
typedef std::map<SourcePath, Expr *> FileParseCache;
#endif
FileParseCache fileParseCache;
@ -250,9 +247,9 @@ private:
* 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;
typedef std::map<SourcePath, Value, std::less<SourcePath>, traceable_allocator<std::pair<const SourcePath, Value>>> FileEvalCache;
#else
typedef std::map<Path, Value> FileEvalCache;
typedef std::map<SourcePath, Value> FileEvalCache;
#endif
FileEvalCache fileEvalCache;
@ -263,7 +260,7 @@ private:
/**
* Cache used by checkSourcePath().
*/
std::unordered_map<Path, Path> resolvedPaths;
std::unordered_map<Path, SourcePath> resolvedPaths;
/**
* Cache used by prim_match().
@ -294,6 +291,12 @@ public:
SearchPath getSearchPath() { return searchPath; }
/**
* Return a `SourcePath` that refers to `path` in the root
* filesystem.
*/
SourcePath rootPath(CanonPath path);
/**
* Allow access to a path.
*/
@ -314,7 +317,7 @@ public:
* Check whether access to a path is allowed and throw an error if
* not. Otherwise return the canonicalised path.
*/
Path checkSourcePath(const Path & path);
SourcePath checkSourcePath(const SourcePath & path);
void checkURI(const std::string & uri);
@ -332,14 +335,14 @@ public:
/**
* Parse a Nix expression from the specified file.
*/
Expr * parseExprFromFile(const Path & path);
Expr * parseExprFromFile(const Path & path, std::shared_ptr<StaticEnv> & staticEnv);
Expr * parseExprFromFile(const SourcePath & path);
Expr * parseExprFromFile(const SourcePath & path, std::shared_ptr<StaticEnv> & staticEnv);
/**
* 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 * parseExprFromString(std::string s, const SourcePath & basePath, std::shared_ptr<StaticEnv> & staticEnv);
Expr * parseExprFromString(std::string s, const SourcePath & basePath);
Expr * parseStdin();
@ -348,14 +351,14 @@ public:
* 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);
void evalFile(const SourcePath & path, Value & v, bool mustBeTrivial = false);
/**
* Like `evalFile`, but with an already parsed expression.
*/
void cacheFile(
const Path & path,
const Path & resolvedPath,
const SourcePath & path,
const SourcePath & resolvedPath,
Expr * e,
Value & v,
bool mustBeTrivial = false);
@ -365,8 +368,8 @@ public:
/**
* 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);
SourcePath findFile(const std::string_view path);
SourcePath findFile(SearchPath & searchPath, const std::string_view path, const PosIdx pos = noPos);
/**
* If the specified search path element is a URI, download it.
@ -454,7 +457,7 @@ public:
bool coerceMore = false, bool copyToStore = true,
bool canonicalizePath = true);
StorePath copyPathToStore(NixStringContext & context, const Path & path);
StorePath copyPathToStore(NixStringContext & context, const SourcePath & path);
/**
* Path coercion.
@ -463,7 +466,7 @@ public:
* path. The result is guaranteed to be a canonicalised, absolute
* path. Nothing is copied to the store.
*/
Path coerceToPath(const PosIdx pos, Value & v, NixStringContext & context, std::string_view errorCtx);
SourcePath coerceToPath(const PosIdx pos, Value & v, NixStringContext & context, std::string_view errorCtx);
/**
* Like coerceToPath, but the result must be a store path.
@ -525,7 +528,7 @@ private:
char * text,
size_t length,
Pos::Origin origin,
Path basePath,
const SourcePath & basePath,
std::shared_ptr<StaticEnv> & staticEnv);
public:
@ -656,7 +659,7 @@ std::string showType(const Value & v);
/**
* If `path` refers to a directory, then append "/default.nix".
*/
Path resolveExprPath(Path path);
SourcePath resolveExprPath(const SourcePath & path);
struct InvalidPathError : EvalError
{

6
src/libexpr/flake/flake.cc
View file

@ -222,9 +222,9 @@ static Flake getFlake(
throw Error("source tree referenced by '%s' does not contain a '%s/flake.nix' file", lockedRef, lockedRef.subdir);
Value vInfo;
state.evalFile(flakeFile, vInfo, true); // FIXME: symlink attack
state.evalFile(CanonPath(flakeFile), vInfo, true); // FIXME: symlink attack
expectType(state, nAttrs, vInfo, state.positions.add({flakeFile}, 1, 1));
expectType(state, nAttrs, vInfo, state.positions.add({CanonPath(flakeFile)}, 1, 1));
if (auto description = vInfo.attrs->get(state.sDescription)) {
expectType(state, nString, *description->value, description->pos);
@ -745,7 +745,7 @@ void callFlake(EvalState & state,
state.vCallFlake = allocRootValue(state.allocValue());
state.eval(state.parseExprFromString(
#include "call-flake.nix.gen.hh"
, "/"), **state.vCallFlake);
, CanonPath::root), **state.vCallFlake);
}
state.callFunction(**state.vCallFlake, *vLocks, *vTmp1, noPos);

6
src/libexpr/nixexpr.cc
View file

@ -32,9 +32,9 @@ struct PosAdapter : AbstractPos
// Get rid of the null terminators added by the parser.
return std::string(s.source->c_str());
},
[](const Path & path) -> std::optional<std::string> {
[](const SourcePath & path) -> std::optional<std::string> {
try {
return readFile(path);
return path.readFile();
} catch (Error &) {
return std::nullopt;
}
@ -48,7 +48,7 @@ struct PosAdapter : AbstractPos
[&](const Pos::none_tag &) { out << "«none»"; },
[&](const Pos::Stdin &) { out << "«stdin»"; },
[&](const Pos::String & s) { out << "«string»"; },
[&](const Path & path) { out << path; }
[&](const SourcePath & path) { out << path; }
}, origin);
}
};

2
src/libexpr/nixexpr.hh
View file

@ -34,7 +34,7 @@ struct Pos
struct Stdin { ref<std::string> source; };
struct String { ref<std::string> source; };
typedef std::variant<none_tag, Stdin, String, Path> Origin;
typedef std::variant<none_tag, Stdin, String, SourcePath> Origin;
Origin origin;

52
src/libexpr/parser.y
View file

@ -31,7 +31,7 @@ namespace nix {
EvalState & state;
SymbolTable & symbols;
Expr * result;
Path basePath;
SourcePath basePath;
PosTable::Origin origin;
std::optional<ErrorInfo> error;
};
@ -509,7 +509,7 @@ string_parts_interpolated
path_start
: PATH {
Path path(absPath({$1.p, $1.l}, data->basePath));
Path path(absPath({$1.p, $1.l}, data->basePath.path.abs()));
/* add back in the trailing '/' to the first segment */
if ($1.p[$1.l-1] == '/' && $1.l > 1)
path += "/";
@ -651,7 +651,7 @@ Expr * EvalState::parse(
char * text,
size_t length,
Pos::Origin origin,
Path basePath,
const SourcePath & basePath,
std::shared_ptr<StaticEnv> & staticEnv)
{
yyscan_t scanner;
@ -675,48 +675,36 @@ Expr * EvalState::parse(
}
Path resolveExprPath(Path path)
SourcePath resolveExprPath(const SourcePath & path)
{
assert(path[0] == '/');
unsigned int followCount = 0, maxFollow = 1024;
/* If `path' is a symlink, follow it. This is so that relative
path references work. */
struct stat st;
while (true) {
// Basic cycle/depth limit to avoid infinite loops.
if (++followCount >= maxFollow)
throw Error("too many symbolic links encountered while traversing the path '%s'", path);
st = lstat(path);
if (!S_ISLNK(st.st_mode)) break;
path = absPath(readLink(path), dirOf(path));
}
auto path2 = path.resolveSymlinks();
/* If `path' refers to a directory, append `/default.nix'. */
if (S_ISDIR(st.st_mode))
path = canonPath(path + "/default.nix");
if (path2.lstat().type == InputAccessor::tDirectory)
return path2 + "default.nix";
return path;
return path2;
}
Expr * EvalState::parseExprFromFile(const Path & path)
Expr * EvalState::parseExprFromFile(const SourcePath & path)
{
return parseExprFromFile(path, staticBaseEnv);
}
Expr * EvalState::parseExprFromFile(const Path & path, std::shared_ptr<StaticEnv> & staticEnv)
Expr * EvalState::parseExprFromFile(const SourcePath & path, std::shared_ptr<StaticEnv> & staticEnv)
{
auto buffer = readFile(path);
// readFile should have left some extra space for terminators
auto buffer = path.readFile();
// readFile hopefully have left some extra space for terminators
buffer.append("\0\0", 2);
return parse(buffer.data(), buffer.size(), path, dirOf(path), staticEnv);
return parse(buffer.data(), buffer.size(), Pos::Origin(path), path.parent(), staticEnv);
}
Expr * EvalState::parseExprFromString(std::string s_, const Path & basePath, std::shared_ptr<StaticEnv> & staticEnv)
Expr * EvalState::parseExprFromString(std::string s_, const SourcePath & basePath, std::shared_ptr<StaticEnv> & staticEnv)
{
auto s = make_ref<std::string>(std::move(s_));
s->append("\0\0", 2);
@ -724,7 +712,7 @@ Expr * EvalState::parseExprFromString(std::string s_, const Path & basePath, std
}
Expr * EvalState::parseExprFromString(std::string s, const Path & basePath)
Expr * EvalState::parseExprFromString(std::string s, const SourcePath & basePath)
{
return parseExprFromString(std::move(s), basePath, staticBaseEnv);
}
@ -737,7 +725,7 @@ Expr * EvalState::parseStdin()
// drainFD should have left some extra space for terminators
buffer.append("\0\0", 2);
auto s = make_ref<std::string>(std::move(buffer));
return parse(s->data(), s->size(), Pos::Stdin{.source = s}, absPath("."), staticBaseEnv);
return parse(s->data(), s->size(), Pos::Stdin{.source = s}, rootPath(CanonPath::fromCwd()), staticBaseEnv);
}
@ -757,13 +745,13 @@ void EvalState::addToSearchPath(const std::string & s)
}
Path EvalState::findFile(const std::string_view path)
SourcePath EvalState::findFile(const std::string_view path)
{
return findFile(searchPath, path);
}
Path EvalState::findFile(SearchPath & searchPath, const std::string_view path, const PosIdx pos)
SourcePath EvalState::findFile(SearchPath & searchPath, const std::string_view path, const PosIdx pos)
{
for (auto & i : searchPath) {
std::string suffix;
@ -779,11 +767,11 @@ Path EvalState::findFile(SearchPath & searchPath, const std::string_view path, c
auto r = resolveSearchPathElem(i);
if (!r.first) continue;
Path res = r.second + suffix;
if (pathExists(res)) return canonPath(res);
if (pathExists(res)) return CanonPath(canonPath(res));
}
if (hasPrefix(path, "nix/"))
return concatStrings(corepkgsPrefix, path.substr(4));
return CanonPath(concatStrings(corepkgsPrefix, path.substr(4)));
debugThrow(ThrownError({
.msg = hintfmt(evalSettings.pureEval

10
src/libexpr/paths.cc Normal file
View file

@ -0,0 +1,10 @@
#include "eval.hh"
namespace nix {
SourcePath EvalState::rootPath(CanonPath path)
{
return std::move(path);
}
}

128
src/libexpr/primops.cc
View file

@ -109,7 +109,7 @@ struct RealisePathFlags {
bool checkForPureEval = true;
};
static Path realisePath(EvalState & state, const PosIdx pos, Value & v, const RealisePathFlags flags = {})
static SourcePath realisePath(EvalState & state, const PosIdx pos, Value & v, const RealisePathFlags flags = {})
{
NixStringContext context;
@ -118,7 +118,7 @@ static Path realisePath(EvalState & state, const PosIdx pos, Value & v, const Re
try {
StringMap rewrites = state.realiseContext(context);
auto realPath = state.toRealPath(rewriteStrings(path, rewrites), context);
auto realPath = state.rootPath(CanonPath(state.toRealPath(rewriteStrings(path.path.abs(), rewrites), context)));
return flags.checkForPureEval
? state.checkSourcePath(realPath)
@ -170,30 +170,30 @@ static void mkOutputString(
static void import(EvalState & state, const PosIdx pos, Value & vPath, Value * vScope, Value & v)
{
auto path = realisePath(state, pos, vPath);
auto path2 = path.path.abs();
// FIXME
auto isValidDerivationInStore = [&]() -> std::optional<StorePath> {
if (!state.store->isStorePath(path))
if (!state.store->isStorePath(path2))
return std::nullopt;
auto storePath = state.store->parseStorePath(path);
if (!(state.store->isValidPath(storePath) && isDerivation(path)))
auto storePath = state.store->parseStorePath(path2);
if (!(state.store->isValidPath(storePath) && isDerivation(path2)))
return std::nullopt;
return storePath;
};
if (auto optStorePath = isValidDerivationInStore()) {
auto storePath = *optStorePath;
Derivation drv = state.store->readDerivation(storePath);
if (auto storePath = isValidDerivationInStore()) {
Derivation drv = state.store->readDerivation(*storePath);
auto attrs = state.buildBindings(3 + drv.outputs.size());
attrs.alloc(state.sDrvPath).mkString(path, {
NixStringContextElem::DrvDeep { .drvPath = storePath },
attrs.alloc(state.sDrvPath).mkString(path2, {
NixStringContextElem::DrvDeep { .drvPath = *storePath },
});
attrs.alloc(state.sName).mkString(drv.env["name"]);
auto & outputsVal = attrs.alloc(state.sOutputs);
state.mkList(outputsVal, drv.outputs.size());
for (const auto & [i, o] : enumerate(drv.outputs)) {
mkOutputString(state, attrs, storePath, drv, o);
mkOutputString(state, attrs, *storePath, drv, o);
(outputsVal.listElems()[i] = state.allocValue())->mkString(o.first);
}
@ -204,7 +204,7 @@ static void import(EvalState & state, const PosIdx pos, Value & vPath, Value * v
state.vImportedDrvToDerivation = allocRootValue(state.allocValue());
state.eval(state.parseExprFromString(
#include "imported-drv-to-derivation.nix.gen.hh"
, "/"), **state.vImportedDrvToDerivation);
, CanonPath::root), **state.vImportedDrvToDerivation);
}
state.forceFunction(**state.vImportedDrvToDerivation, pos, "while evaluating imported-drv-to-derivation.nix.gen.hh");
@ -212,10 +212,10 @@ static void import(EvalState & state, const PosIdx pos, Value & vPath, Value * v
state.forceAttrs(v, pos, "while calling imported-drv-to-derivation.nix.gen.hh");
}
else if (path == corepkgsPrefix + "fetchurl.nix") {
else if (path2 == corepkgsPrefix + "fetchurl.nix") {
state.eval(state.parseExprFromString(
#include "fetchurl.nix.gen.hh"
, "/"), v);
, CanonPath::root), v);
}
else {
@ -336,7 +336,7 @@ void prim_importNative(EvalState & state, const PosIdx pos, Value * * args, Valu
std::string sym(state.forceStringNoCtx(*args[1], pos, "while evaluating the second argument passed to builtins.importNative"));
void *handle = dlopen(path.c_str(), RTLD_LAZY | RTLD_LOCAL);
void *handle = dlopen(path.path.c_str(), RTLD_LAZY | RTLD_LOCAL);
if (!handle)
state.debugThrowLastTrace(EvalError("could not open '%1%': %2%", path, dlerror()));
@ -384,7 +384,7 @@ void prim_exec(EvalState & state, const PosIdx pos, Value * * args, Value & v)
auto output = runProgram(program, true, commandArgs);
Expr * parsed;
try {
parsed = state.parseExprFromString(std::move(output), "/");
parsed = state.parseExprFromString(std::move(output), state.rootPath(CanonPath::root));
} catch (Error & e) {
e.addTrace(state.positions[pos], "while parsing the output from '%1%'", program);
throw;
@ -594,7 +594,7 @@ struct CompareValues
case nString:
return strcmp(v1->string.s, v2->string.s) < 0;
case nPath:
return strcmp(v1->path, v2->path) < 0;
return strcmp(v1->_path, v2->_path) < 0;
case nList:
// Lexicographic comparison
for (size_t i = 0;; i++) {
@ -1445,8 +1445,8 @@ static RegisterPrimOp primop_placeholder({
static void prim_toPath(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
NixStringContext context;
Path path = state.coerceToPath(pos, *args[0], context, "while evaluating the first argument passed to builtins.toPath");
v.mkString(canonPath(path), context);
auto path = state.coerceToPath(pos, *args[0], context, "while evaluating the first argument passed to builtins.toPath");
v.mkString(path.path.abs(), context);
}
static RegisterPrimOp primop_toPath({
@ -1476,21 +1476,22 @@ static void prim_storePath(EvalState & state, const PosIdx pos, Value * * args,
}));
NixStringContext context;
Path path = state.checkSourcePath(state.coerceToPath(pos, *args[0], context, "while evaluating the first argument passed to builtins.storePath"));
auto path = state.checkSourcePath(state.coerceToPath(pos, *args[0], context, "while evaluating the first argument passed to builtins.storePath")).path;
/* Resolve symlinks in ‘path’, unless ‘path’ itself is a symlink
directly in the store. The latter condition is necessary so
e.g. nix-push does the right thing. */
if (!state.store->isStorePath(path)) path = canonPath(path, true);
if (!state.store->isInStore(path))
if (!state.store->isStorePath(path.abs()))
path = CanonPath(canonPath(path.abs(), true));
if (!state.store->isInStore(path.abs()))
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("path '%1%' is not in the Nix store", path),
.errPos = state.positions[pos]
}));
auto path2 = state.store->toStorePath(path).first;
auto path2 = state.store->toStorePath(path.abs()).first;
if (!settings.readOnlyMode)
state.store->ensurePath(path2);
context.insert(NixStringContextElem::Opaque { .path = path2 });
v.mkString(path, context);
v.mkString(path.abs(), context);
}
static RegisterPrimOp primop_storePath({
@ -1521,7 +1522,7 @@ static void prim_pathExists(EvalState & state, const PosIdx pos, Value * * args,
auto path = realisePath(state, pos, *args[0], { .checkForPureEval = false });
try {
v.mkBool(pathExists(state.checkSourcePath(path)));
v.mkBool(state.checkSourcePath(path).pathExists());
} catch (SysError & e) {
/* Don't give away info from errors while canonicalising
‘path’ in restricted mode. */
@ -1567,12 +1568,18 @@ static RegisterPrimOp primop_baseNameOf({
of the argument. */
static void prim_dirOf(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
state.forceValue(*args[0], pos);
if (args[0]->type() == nPath) {
auto path = args[0]->path();
v.mkPath(path.path.isRoot() ? path : path.parent());
} else {
NixStringContext context;
auto path = state.coerceToString(pos, *args[0], context,
"while evaluating the first argument passed to builtins.dirOf",
"while evaluating the first argument passed to 'builtins.dirOf'",
false, false);
auto dir = dirOf(*path);
if (args[0]->type() == nPath) v.mkPath(dir); else v.mkString(dir, context);
v.mkString(dir, context);
}
}
static RegisterPrimOp primop_dirOf({
@ -1590,13 +1597,13 @@ static RegisterPrimOp primop_dirOf({
static void prim_readFile(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
auto path = realisePath(state, pos, *args[0]);
auto s = readFile(path);
auto s = path.readFile();
if (s.find((char) 0) != std::string::npos)
state.debugThrowLastTrace(Error("the contents of the file '%1%' cannot be represented as a Nix string", path));
StorePathSet refs;
if (state.store->isInStore(path)) {
if (state.store->isInStore(path.path.abs())) {
try {
refs = state.store->queryPathInfo(state.store->toStorePath(path).first)->references;
refs = state.store->queryPathInfo(state.store->toStorePath(path.path.abs()).first)->references;
} catch (Error &) { // FIXME: should be InvalidPathError
}
// Re-scan references to filter down to just the ones that actually occur in the file.
@ -1682,7 +1689,7 @@ static void prim_hashFile(EvalState & state, const PosIdx pos, Value * * args, V
auto path = realisePath(state, pos, *args[1]);
v.mkString(hashFile(*ht, path).to_string(Base16, false));
v.mkString(hashString(*ht, path.readFile()).to_string(Base16, false));
}
static RegisterPrimOp primop_hashFile({
@ -1696,26 +1703,20 @@ static RegisterPrimOp primop_hashFile({
.fun = prim_hashFile,
});
/* Stringize a directory entry enum. Used by `readFileType' and `readDir'. */
static const char * dirEntTypeToString(unsigned char dtType)
static std::string_view fileTypeToString(InputAccessor::Type type)
{
/* Enum DT_(DIR|LNK|REG|UNKNOWN) */
switch(dtType) {
case DT_REG: return "regular"; break;
case DT_DIR: return "directory"; break;
case DT_LNK: return "symlink"; break;
default: return "unknown"; break;
}
return "unknown"; /* Unreachable */
return
type == InputAccessor::Type::tRegular ? "regular" :
type == InputAccessor::Type::tDirectory ? "directory" :
type == InputAccessor::Type::tSymlink ? "symlink" :
"unknown";
}
static void prim_readFileType(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
auto path = realisePath(state, pos, *args[0]);
/* Retrieve the directory entry type and stringize it. */
v.mkString(dirEntTypeToString(getFileType(path)));
v.mkString(fileTypeToString(path.lstat().type));
}
static RegisterPrimOp primop_readFileType({
@ -1736,8 +1737,7 @@ static void prim_readDir(EvalState & state, const PosIdx pos, Value * * args, Va
// Retrieve directory entries for all nodes in a directory.
// This is similar to `getFileType` but is optimized to reduce system calls
// on many systems.
DirEntries entries = readDirectory(path);
auto entries = path.readDirectory();
auto attrs = state.buildBindings(entries.size());
// If we hit unknown directory entry types we may need to fallback to
@ -1746,22 +1746,21 @@ static void prim_readDir(EvalState & state, const PosIdx pos, Value * * args, Va
// `builtins.readFileType` application.
Value * readFileType = nullptr;
for (auto & ent : entries) {
auto & attr = attrs.alloc(ent.name);
if (ent.type == DT_UNKNOWN) {
for (auto & [name, type] : entries) {
auto & attr = attrs.alloc(name);
if (!type) {
// Some filesystems or operating systems may not be able to return
// detailed node info quickly in this case we produce a thunk to
// query the file type lazily.
auto epath = state.allocValue();
Path path2 = path + "/" + ent.name;
epath->mkString(path2);
epath->mkPath(path + name);
if (!readFileType)
readFileType = &state.getBuiltin("readFileType");
attr.mkApp(readFileType, epath);
} else {
// This branch of the conditional is much more likely.
// Here we just stringize the directory entry type.
attr.mkString(dirEntTypeToString(ent.type));
attr.mkString(fileTypeToString(*type));
}
}
@ -2068,7 +2067,7 @@ static RegisterPrimOp primop_toFile({
static void addPath(
EvalState & state,
const PosIdx pos,
const std::string & name,
std::string_view name,
Path path,
Value * filterFun,
FileIngestionMethod method,
@ -2096,7 +2095,7 @@ static void addPath(
path = evalSettings.pureEval && expectedHash
? path
: state.checkSourcePath(path);
: state.checkSourcePath(CanonPath(path)).path.abs();
PathFilter filter = filterFun ? ([&](const Path & path) {
auto st = lstat(path);
@ -2149,9 +2148,10 @@ static void addPath(
static void prim_filterSource(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
NixStringContext context;
Path path = state.coerceToPath(pos, *args[1], context, "while evaluating the second argument (the path to filter) passed to builtins.filterSource");
auto path = state.coerceToPath(pos, *args[1], context,
"while evaluating the second argument (the path to filter) passed to builtins.filterSource");
state.forceFunction(*args[0], pos, "while evaluating the first argument passed to builtins.filterSource");
addPath(state, pos, std::string(baseNameOf(path)), path, args[0], FileIngestionMethod::Recursive, std::nullopt, v, context);
addPath(state, pos, path.baseName(), path.path.abs(), args[0], FileIngestionMethod::Recursive, std::nullopt, v, context);
}
static RegisterPrimOp primop_filterSource({
@ -2211,18 +2211,19 @@ static RegisterPrimOp primop_filterSource({
static void prim_path(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
state.forceAttrs(*args[0], pos, "while evaluating the argument passed to builtins.path");
Path path;
std::optional<SourcePath> path;
std::string name;
Value * filterFun = nullptr;
auto method = FileIngestionMethod::Recursive;
std::optional<Hash> expectedHash;
NixStringContext context;
state.forceAttrs(*args[0], pos, "while evaluating the argument passed to 'builtins.path'");
for (auto & attr : *args[0]->attrs) {
auto n = state.symbols[attr.name];
if (n == "path")
path = state.coerceToPath(attr.pos, *attr.value, context, "while evaluating the `path` attribute passed to builtins.path");
path.emplace(state.coerceToPath(attr.pos, *attr.value, context, "while evaluating the 'path' attribute passed to 'builtins.path'"));
else if (attr.name == state.sName)
name = state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the `name` attribute passed to builtins.path");
else if (n == "filter")
@ -2237,15 +2238,15 @@ static void prim_path(EvalState & state, const PosIdx pos, Value * * args, Value
.errPos = state.positions[attr.pos]
}));
}
if (path.empty())
if (!path)
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("missing required 'path' attribute in the first argument to builtins.path"),
.errPos = state.positions[pos]
}));
if (name.empty())
name = baseNameOf(path);
name = path->baseName();
addPath(state, pos, name, path, filterFun, method, expectedHash, v, context);
addPath(state, pos, name, path->path.abs(), filterFun, method, expectedHash, v, context);
}
static RegisterPrimOp primop_path({
@ -4163,7 +4164,6 @@ void EvalState::createBaseEnv()
/* Add a wrapper around the derivation primop that computes the
`drvPath' and `outPath' attributes lazily. */
sDerivationNix = symbols.create(derivationNixPath);
auto vDerivation = allocValue();
addConstant("derivation", vDerivation);
@ -4180,7 +4180,7 @@ void EvalState::createBaseEnv()
// the parser needs two NUL bytes as terminators; one of them
// is implied by being a C string.
"\0";
eval(parse(code, sizeof(code), derivationNixPath, "/", staticBaseEnv), *vDerivation);
eval(parse(code, sizeof(code), derivationInternal, {CanonPath::root}, staticBaseEnv), *vDerivation);
}

2
src/libexpr/tests/libexpr.hh
View file

@ -28,7 +28,7 @@ namespace nix {
}
Value eval(std::string input, bool forceValue = true) {
Value v;
Expr * e = state.parseExprFromString(input, "");
Expr * e = state.parseExprFromString(input, state.rootPath(CanonPath::root));
assert(e);
state.eval(e, v);
if (forceValue)

2
src/libexpr/tests/local.mk
View file

@ -12,7 +12,7 @@ libexpr-tests_SOURCES := \
$(wildcard $(d)/*.cc) \
$(wildcard $(d)/value/*.cc)
libexpr-tests_CXXFLAGS += -I src/libexpr -I src/libutil -I src/libstore -I src/libexpr/tests
libexpr-tests_CXXFLAGS += -I src/libexpr -I src/libutil -I src/libstore -I src/libexpr/tests -I src/libfetchers
libexpr-tests_LIBS = libstore-tests libutils-tests libexpr libutil libstore libfetchers

5
src/libexpr/value-to-json.cc
View file

@ -36,9 +36,10 @@ json printValueAsJSON(EvalState & state, bool strict,
case nPath:
if (copyToStore)
out = state.store->printStorePath(state.copyPathToStore(context, v.path));
out = state.store->printStorePath(
state.copyPathToStore(context, v.path()));
else
out = v.path;
out = v.path().path.abs();
break;
case nNull:

6
src/libexpr/value-to-xml.cc
View file

@ -24,8 +24,8 @@ static void printValueAsXML(EvalState & state, bool strict, bool location,
static void posToXML(EvalState & state, XMLAttrs & xmlAttrs, const Pos & pos)
{
if (auto path = std::get_if<Path>(&pos.origin))
xmlAttrs["path"] = *path;
if (auto path = std::get_if<SourcePath>(&pos.origin))
xmlAttrs["path"] = path->path.abs();
xmlAttrs["line"] = fmt("%1%", pos.line);
xmlAttrs["column"] = fmt("%1%", pos.column);
}
@ -78,7 +78,7 @@ static void printValueAsXML(EvalState & state, bool strict, bool location,
break;
case nPath:
doc.writeEmptyElement("path", singletonAttrs("value", v.path));
doc.writeEmptyElement("path", singletonAttrs("value", v.path().to_string()));
break;
case nNull:

28
src/libexpr/value.hh
View file

@ -5,6 +5,7 @@
#include "symbol-table.hh"
#include "value/context.hh"
#include "input-accessor.hh"
#if HAVE_BOEHMGC
#include <gc/gc_allocator.h>
@ -188,7 +189,7 @@ public:
const char * * context; // must be in sorted order
} string;
const char * path;
const char * _path;
Bindings * attrs;
struct {
size_t size;
@ -272,15 +273,20 @@ public:
void mkStringMove(const char * s, const NixStringContext & context);
inline void mkPath(const char * s)
inline void mkString(const Symbol & s)
{
mkString(((const std::string &) s).c_str());
}
void mkPath(const SourcePath & path);
inline void mkPath(const char * path)
{
clearValue();
internalType = tPath;
path = s;
_path = path;
}
void mkPath(std::string_view s);
inline void mkNull()
{
clearValue();
@ -421,6 +427,18 @@ public:
auto begin = listElems();
return ConstListIterable { begin, begin + listSize() };
}
SourcePath path() const
{
assert(internalType == tPath);
return SourcePath{CanonPath(_path)};
}
std::string_view str() const
{
assert(internalType == tString);
return std::string_view(string.s);
}
};

100
src/libfetchers/input-accessor.cc Normal file
View file

@ -0,0 +1,100 @@
#include "input-accessor.hh"
#include "store-api.hh"
namespace nix {
std::ostream & operator << (std::ostream & str, const SourcePath & path)
{
str << path.to_string();
return str;
}
std::string_view SourcePath::baseName() const
{
return path.baseName().value_or("source");
}
SourcePath SourcePath::parent() const
{
auto p = path.parent();
assert(p);
return std::move(*p);
}
InputAccessor::Stat SourcePath::lstat() const
{
auto st = nix::lstat(path.abs());
return InputAccessor::Stat {
.type =
S_ISREG(st.st_mode) ? InputAccessor::tRegular :
S_ISDIR(st.st_mode) ? InputAccessor::tDirectory :
S_ISLNK(st.st_mode) ? InputAccessor::tSymlink :
InputAccessor::tMisc,
.isExecutable = S_ISREG(st.st_mode) && st.st_mode & S_IXUSR
};
}
std::optional<InputAccessor::Stat> SourcePath::maybeLstat() const
{
// FIXME: merge these into one operation.
if (!pathExists())
return {};
return lstat();
}
InputAccessor::DirEntries SourcePath::readDirectory() const
{
InputAccessor::DirEntries res;
for (auto & entry : nix::readDirectory(path.abs())) {
std::optional<InputAccessor::Type> type;
switch (entry.type) {
case DT_REG: type = InputAccessor::Type::tRegular; break;
case DT_LNK: type = InputAccessor::Type::tSymlink; break;
case DT_DIR: type = InputAccessor::Type::tDirectory; break;
}
res.emplace(entry.name, type);
}
return res;
}
StorePath SourcePath::fetchToStore(
ref<Store> store,
std::string_view name,
PathFilter * filter,
RepairFlag repair) const
{
return
settings.readOnlyMode
? store->computeStorePathForPath(name, path.abs(), FileIngestionMethod::Recursive, htSHA256, filter ? *filter : defaultPathFilter).first
: store->addToStore(name, path.abs(), FileIngestionMethod::Recursive, htSHA256, filter ? *filter : defaultPathFilter, repair);
}
SourcePath SourcePath::resolveSymlinks() const
{
SourcePath res(CanonPath::root);
int linksAllowed = 1024;
for (auto & component : path) {
res.path.push(component);
while (true) {
if (auto st = res.maybeLstat()) {
if (!linksAllowed--)
throw Error("infinite symlink recursion in path '%s'", path);
if (st->type != InputAccessor::tSymlink) break;
auto target = res.readLink();
if (hasPrefix(target, "/"))
res = CanonPath(target);
else {
res.path.pop();
res.path.extend(CanonPath(target));
}
} else
break;
}
}
return res;
}
}

167
src/libfetchers/input-accessor.hh Normal file
View file

@ -0,0 +1,167 @@
#pragma once
#include "ref.hh"
#include "types.hh"
#include "archive.hh"
#include "canon-path.hh"
#include "repair-flag.hh"
namespace nix {
class StorePath;
class Store;
struct InputAccessor
{
enum Type {
tRegular, tSymlink, tDirectory,
/**
Any other node types that may be encountered on the file system, such as device nodes, sockets, named pipe, and possibly even more exotic things.
Responsible for `"unknown"` from `builtins.readFileType "/dev/null"`.
Unlike `DT_UNKNOWN`, this must not be used for deferring the lookup of types.
*/
tMisc
};
struct Stat
{
Type type = tMisc;
//uint64_t fileSize = 0; // regular files only
bool isExecutable = false; // regular files only
};
typedef std::optional<Type> DirEntry;
typedef std::map<std::string, DirEntry> DirEntries;
};
/**
* An abstraction for accessing source files during
* evaluation. Currently, it's just a wrapper around `CanonPath` that
* accesses files in the regular filesystem, but in the future it will
* support fetching files in other ways.
*/
struct SourcePath
{
CanonPath path;
SourcePath(CanonPath path)
: path(std::move(path))
{ }
std::string_view baseName() const;
/**
* Construct the parent of this `SourcePath`. Aborts if `this`
* denotes the root.
*/
SourcePath parent() const;
/**
* If this `SourcePath` denotes a regular file (not a symlink),
* return its contents; otherwise throw an error.
*/
std::string readFile() const
{ return nix::readFile(path.abs()); }
/**
* Return whether this `SourcePath` denotes a file (of any type)
* that exists
*/
bool pathExists() const
{ return nix::pathExists(path.abs()); }
/**
* Return stats about this `SourcePath`, or throw an exception if
* it doesn't exist.
*/
InputAccessor::Stat lstat() const;
/**
* Return stats about this `SourcePath`, or std::nullopt if it
* doesn't exist.
*/
std::optional<InputAccessor::Stat> maybeLstat() const;
/**
* If this `SourcePath` denotes a directory (not a symlink),
* return its directory entries; otherwise throw an error.
*/
InputAccessor::DirEntries readDirectory() const;
/**
* If this `SourcePath` denotes a symlink, return its target;
* otherwise throw an error.
*/
std::string readLink() const
{ return nix::readLink(path.abs()); }
/**
* Dump this `SourcePath` to `sink` as a NAR archive.
*/
void dumpPath(
Sink & sink,
PathFilter & filter = defaultPathFilter) const
{ return nix::dumpPath(path.abs(), sink, filter); }
/**
* Copy this `SourcePath` to the Nix store.
*/
StorePath fetchToStore(
ref<Store> store,
std::string_view name = "source",
PathFilter * filter = nullptr,
RepairFlag repair = NoRepair) const;
/**
* Return the location of this path in the "real" filesystem, if
* it has a physical location.
*/
std::optional<CanonPath> getPhysicalPath() const
{ return path; }
std::string to_string() const
{ return path.abs(); }
/**
* Append a `CanonPath` to this path.
*/
SourcePath operator + (const CanonPath & x) const
{ return {path + x}; }
/**
* Append a single component `c` to this path. `c` must not
* contain a slash. A slash is implicitly added between this path
* and `c`.
*/
SourcePath operator + (std::string_view c) const
{ return {path + c}; }
bool operator == (const SourcePath & x) const
{
return path == x.path;
}
bool operator != (const SourcePath & x) const
{
return path != x.path;
}
bool operator < (const SourcePath & x) const
{
return path < x.path;
}
/**
* Resolve any symlinks in this `SourcePath` (including its
* parents). The result is a `SourcePath` in which no element is a
* symlink.
*/
SourcePath resolveSymlinks() const;
};
std::ostream & operator << (std::ostream & str, const SourcePath & path);
}

5
src/libutil/canon-path.cc
View file

@ -13,6 +13,11 @@ CanonPath::CanonPath(std::string_view raw, const CanonPath & root)
: path(absPath((Path) raw, root.abs()))
{ }
CanonPath CanonPath::fromCwd(std::string_view path)
{
return CanonPath(unchecked_t(), absPath((Path) path));
}
std::optional<CanonPath> CanonPath::parent() const
{
if (isRoot()) return std::nullopt;

2
src/libutil/canon-path.hh
View file

@ -46,6 +46,8 @@ public:
: path(std::move(path))
{ }
static CanonPath fromCwd(std::string_view path = ".");
static CanonPath root;
/**

6
src/nix-build/nix-build.cc
View file

@ -289,7 +289,7 @@ static void main_nix_build(int argc, char * * argv)
else
for (auto i : left) {
if (fromArgs)
exprs.push_back(state->parseExprFromString(std::move(i), absPath(".")));
exprs.push_back(state->parseExprFromString(std::move(i), state->rootPath(CanonPath::fromCwd())));
else {
auto absolute = i;
try {
@ -385,7 +385,9 @@ static void main_nix_build(int argc, char * * argv)
if (!shell) {
try {
auto expr = state->parseExprFromString("(import <nixpkgs> {}).bashInteractive", absPath("."));
auto expr = state->parseExprFromString(
"(import <nixpkgs> {}).bashInteractive",
state->rootPath(CanonPath::fromCwd()));
Value v;
state->eval(expr, v);

70
src/nix-env/nix-env.cc
View file

@ -44,7 +44,7 @@ typedef enum {
struct InstallSourceInfo
{
InstallSourceType type;
Path nixExprPath; /* for srcNixExprDrvs, srcNixExprs */
std::shared_ptr<SourcePath> nixExprPath; /* for srcNixExprDrvs, srcNixExprs */
Path profile; /* for srcProfile */
std::string systemFilter; /* for srcNixExprDrvs */
Bindings * autoArgs;
@ -92,9 +92,11 @@ static bool parseInstallSourceOptions(Globals & globals,
}
static bool isNixExpr(const Path & path, struct stat & st)
static bool isNixExpr(const SourcePath & path, struct InputAccessor::Stat & st)
{
return S_ISREG(st.st_mode) || (S_ISDIR(st.st_mode) && pathExists(path + "/default.nix"));
return
st.type == InputAccessor::tRegular
|| (st.type == InputAccessor::tDirectory && (path + "default.nix").pathExists());
}
@ -102,10 +104,10 @@ static constexpr size_t maxAttrs = 1024;
static void getAllExprs(EvalState & state,
const Path & path, StringSet & seen, BindingsBuilder & attrs)
const SourcePath & path, StringSet & seen, BindingsBuilder & attrs)
{
StringSet namesSorted;
for (auto & i : readDirectory(path)) namesSorted.insert(i.name);
for (auto & [name, _] : path.readDirectory()) namesSorted.insert(name);
for (auto & i : namesSorted) {
/* Ignore the manifest.nix used by profiles. This is
@ -113,13 +115,16 @@ static void getAllExprs(EvalState & state,
are implemented using profiles). */
if (i == "manifest.nix") continue;
Path path2 = path + "/" + i;
SourcePath path2 = path + i;
struct stat st;
if (stat(path2.c_str(), &st) == -1)
InputAccessor::Stat st;
try {
st = path2.resolveSymlinks().lstat();
} catch (Error &) {
continue; // ignore dangling symlinks in ~/.nix-defexpr
}
if (isNixExpr(path2, st) && (!S_ISREG(st.st_mode) || hasSuffix(path2, ".nix"))) {
if (isNixExpr(path2, st) && (st.type != InputAccessor::tRegular || hasSuffix(path2.baseName(), ".nix"))) {
/* Strip off the `.nix' filename suffix (if applicable),
otherwise the attribute cannot be selected with the
`-A' option. Useful if you want to stick a Nix
@ -129,21 +134,20 @@ static void getAllExprs(EvalState & state,
attrName = std::string(attrName, 0, attrName.size() - 4);
if (!seen.insert(attrName).second) {
std::string suggestionMessage = "";
if (path2.find("channels") != std::string::npos && path.find("channels") != std::string::npos) {
if (path2.path.abs().find("channels") != std::string::npos && path.path.abs().find("channels") != std::string::npos)
suggestionMessage = fmt("\nsuggestion: remove '%s' from either the root channels or the user channels", attrName);
}
printError("warning: name collision in input Nix expressions, skipping '%1%'"
"%2%", path2, suggestionMessage);
continue;
}
/* Load the expression on demand. */
auto vArg = state.allocValue();
vArg->mkString(path2);
vArg->mkString(path2.path.abs());
if (seen.size() == maxAttrs)
throw Error("too many Nix expressions in directory '%1%'", path);
attrs.alloc(attrName).mkApp(&state.getBuiltin("import"), vArg);
}
else if (S_ISDIR(st.st_mode))
else if (st.type == InputAccessor::tDirectory)
/* `path2' is a directory (with no default.nix in it);
recurse into it. */
getAllExprs(state, path2, seen, attrs);
@ -152,11 +156,9 @@ static void getAllExprs(EvalState & state,
static void loadSourceExpr(EvalState & state, const Path & path, Value & v)
static void loadSourceExpr(EvalState & state, const SourcePath & path, Value & v)
{
struct stat st;
if (stat(path.c_str(), &st) == -1)
throw SysError("getting information about '%1%'", path);
auto st = path.resolveSymlinks().lstat();
if (isNixExpr(path, st))
state.evalFile(path, v);
@ -167,7 +169,7 @@ static void loadSourceExpr(EvalState & state, const Path & path, Value & v)
set flat, not nested, to make it easier for a user to have a
~/.nix-defexpr directory that includes some system-wide
directory). */
else if (S_ISDIR(st.st_mode)) {
else if (st.type == InputAccessor::tDirectory) {
auto attrs = state.buildBindings(maxAttrs);
attrs.alloc("_combineChannels").mkList(0);
StringSet seen;
@ -179,7 +181,7 @@ static void loadSourceExpr(EvalState & state, const Path & path, Value & v)
}
static void loadDerivations(EvalState & state, Path nixExprPath,
static void loadDerivations(EvalState & state, const SourcePath & nixExprPath,
std::string systemFilter, Bindings & autoArgs,
const std::string & pathPrefix, DrvInfos & elems)
{
@ -390,7 +392,7 @@ static void queryInstSources(EvalState & state,
/* Load the derivations from the (default or specified)
Nix expression. */
DrvInfos allElems;
loadDerivations(state, instSource.nixExprPath,
loadDerivations(state, *instSource.nixExprPath,
instSource.systemFilter, *instSource.autoArgs, "", allElems);
elems = filterBySelector(state, allElems, args, newestOnly);
@ -407,10 +409,10 @@ static void queryInstSources(EvalState & state,
case srcNixExprs: {
Value vArg;
loadSourceExpr(state, instSource.nixExprPath, vArg);
loadSourceExpr(state, *instSource.nixExprPath, vArg);
for (auto & i : args) {
Expr * eFun = state.parseExprFromString(i, absPath("."));
Expr * eFun = state.parseExprFromString(i, state.rootPath(CanonPath::fromCwd()));
Value vFun, vTmp;
state.eval(eFun, vFun);
vTmp.mkApp(&vFun, &vArg);
@ -462,7 +464,7 @@ static void queryInstSources(EvalState & state,
case srcAttrPath: {
Value vRoot;
loadSourceExpr(state, instSource.nixExprPath, vRoot);
loadSourceExpr(state, *instSource.nixExprPath, vRoot);
for (auto & i : args) {
Value & v(*findAlongAttrPath(state, i, *instSource.autoArgs, vRoot).first);
getDerivations(state, v, "", *instSource.autoArgs, elems, true);
@ -1030,7 +1032,7 @@ static void opQuery(Globals & globals, Strings opFlags, Strings opArgs)
installedElems = queryInstalled(*globals.state, globals.profile);
if (source == sAvailable || compareVersions)
loadDerivations(*globals.state, globals.instSource.nixExprPath,
loadDerivations(*globals.state, *globals.instSource.nixExprPath,
globals.instSource.systemFilter, *globals.instSource.autoArgs,
attrPath, availElems);
@ -1395,22 +1397,20 @@ static int main_nix_env(int argc, char * * argv)
Globals globals;
globals.instSource.type = srcUnknown;
{
Path nixExprPath = settings.useXDGBaseDirectories ? createNixStateDir() + "/defexpr" : getHome() + "/.nix-defexpr";
globals.instSource.nixExprPath = nixExprPath;
}
globals.instSource.systemFilter = "*";
if (!pathExists(globals.instSource.nixExprPath)) {
Path nixExprPath = settings.useXDGBaseDirectories ? createNixStateDir() + "/defexpr" : getHome() + "/.nix-defexpr";
if (!pathExists(nixExprPath)) {
try {
createDirs(globals.instSource.nixExprPath);
createDirs(nixExprPath);
replaceSymlink(
defaultChannelsDir(),
globals.instSource.nixExprPath + "/channels");
nixExprPath + "/channels");
if (getuid() != 0)
replaceSymlink(
rootChannelsDir(),
globals.instSource.nixExprPath + "/channels_root");
nixExprPath + "/channels_root");
} catch (Error &) { }
}
@ -1517,8 +1517,10 @@ static int main_nix_env(int argc, char * * argv)
globals.state = std::shared_ptr<EvalState>(new EvalState(myArgs.searchPath, store));
globals.state->repair = repair;
if (file != "")
globals.instSource.nixExprPath = lookupFileArg(*globals.state, file);
globals.instSource.nixExprPath = std::make_shared<SourcePath>(
file != ""
? lookupFileArg(*globals.state, file)
: globals.state->rootPath(CanonPath(nixExprPath)));
globals.instSource.autoArgs = myArgs.getAutoArgs(*globals.state);

6
src/nix-env/user-env.cc
View file

@ -19,10 +19,10 @@ DrvInfos queryInstalled(EvalState & state, const Path & userEnv)
DrvInfos elems;
if (pathExists(userEnv + "/manifest.json"))
throw Error("profile '%s' is incompatible with 'nix-env'; please use 'nix profile' instead", userEnv);
Path manifestFile = userEnv + "/manifest.nix";
auto manifestFile = userEnv + "/manifest.nix";
if (pathExists(manifestFile)) {
Value v;
state.evalFile(manifestFile, v);
state.evalFile(state.rootPath(CanonPath(manifestFile)), v);
Bindings & bindings(*state.allocBindings(0));
getDerivations(state, v, "", bindings, elems, false);
}
@ -114,7 +114,7 @@ bool createUserEnv(EvalState & state, DrvInfos & elems,
Value envBuilder;
state.eval(state.parseExprFromString(
#include "buildenv.nix.gen.hh"
, "/"), envBuilder);
, state.rootPath(CanonPath::root)), envBuilder);
/* Construct a Nix expression that calls the user environment
builder with the manifest as argument. */

10
src/nix-instantiate/nix-instantiate.cc
View file

@ -168,9 +168,11 @@ static int main_nix_instantiate(int argc, char * * argv)
if (findFile) {
for (auto & i : files) {
Path p = state->findFile(i);
if (p == "") throw Error("unable to find '%1%'", i);
std::cout << p << std::endl;
auto p = state->findFile(i);
if (auto fn = p.getPhysicalPath())
std::cout << fn->abs() << std::endl;
else
throw Error("'%s' has no physical path", p);
}
return 0;
}
@ -184,7 +186,7 @@ static int main_nix_instantiate(int argc, char * * argv)
for (auto & i : files) {
Expr * e = fromArgs
? state->parseExprFromString(i, absPath("."))
? state->parseExprFromString(i, state->rootPath(CanonPath::fromCwd()))
: state->parseExprFromFile(resolveExprPath(state->checkSourcePath(lookupFileArg(*state, i))));
processExpr(*state, attrPaths, parseOnly, strict, autoArgs,
evalOnly, outputKind, xmlOutputSourceLocation, e);

2
src/nix/eval.cc
View file

@ -66,7 +66,7 @@ struct CmdEval : MixJSON, InstallableValueCommand, MixReadOnlyOption
if (apply) {
auto vApply = state->allocValue();
state->eval(state->parseExprFromString(*apply, absPath(".")), *vApply);
state->eval(state->parseExprFromString(*apply, state->rootPath(CanonPath::fromCwd())), *vApply);
auto vRes = state->allocValue();
state->callFunction(*vApply, *v, *vRes, noPos);
v = vRes;

4
src/nix/flake.cc
View file

@ -440,8 +440,8 @@ struct CmdFlakeCheck : FlakeCommand
if (attr->name == state->symbols.create("path")) {
NixStringContext context;
auto path = state->coerceToPath(attr->pos, *attr->value, context, "");
if (!store->isInStore(path))
throw Error("template '%s' has a bad 'path' attribute");
if (!path.pathExists())
throw Error("template '%s' refers to a non-existent path '%s'", attrPath, path);
// TODO: recursively check the flake in 'path'.
}
} else

6
src/nix/main.cc
View file

@ -201,14 +201,14 @@ static void showHelp(std::vector<std::string> subcommand, NixArgs & toplevel)
auto vGenerateManpage = state.allocValue();
state.eval(state.parseExprFromString(
#include "generate-manpage.nix.gen.hh"
, "/"), *vGenerateManpage);
, CanonPath::root), *vGenerateManpage);
auto vUtils = state.allocValue();
state.cacheFile(
"/utils.nix", "/utils.nix",
CanonPath("/utils.nix"), CanonPath("/utils.nix"),
state.parseExprFromString(
#include "utils.nix.gen.hh"
, "/"),
, CanonPath::root),
*vUtils);
auto vDump = state.allocValue();

11
src/nix/prefetch.cc
View file

@ -27,7 +27,10 @@ std::string resolveMirrorUrl(EvalState & state, const std::string & url)
Value vMirrors;
// FIXME: use nixpkgs flake
state.eval(state.parseExprFromString("import <nixpkgs/pkgs/build-support/fetchurl/mirrors.nix>", "."), vMirrors);
state.eval(state.parseExprFromString(
"import <nixpkgs/pkgs/build-support/fetchurl/mirrors.nix>",
state.rootPath(CanonPath::root)),
vMirrors);
state.forceAttrs(vMirrors, noPos, "while evaluating the set of all mirrors");
auto mirrorList = vMirrors.attrs->find(state.symbols.create(mirrorName));
@ -198,9 +201,11 @@ static int main_nix_prefetch_url(int argc, char * * argv)
throw UsageError("you must specify a URL");
url = args[0];
} else {
Path path = resolveExprPath(lookupFileArg(*state, args.empty() ? "." : args[0]));
Value vRoot;
state->evalFile(path, vRoot);
state->evalFile(
resolveExprPath(
lookupFileArg(*state, args.empty() ? "." : args[0])),
vRoot);
Value & v(*findAlongAttrPath(*state, attrPath, autoArgs, vRoot).first);
state->forceAttrs(v, noPos, "while evaluating the source attribute to prefetch");

2
src/nix/upgrade-nix.cc
View file

@ -148,7 +148,7 @@ struct CmdUpgradeNix : MixDryRun, StoreCommand
auto state = std::make_unique<EvalState>(Strings(), store);
auto v = state->allocValue();
state->eval(state->parseExprFromString(res.data, "/no-such-path"), *v);
state->eval(state->parseExprFromString(res.data, state->rootPath(CanonPath("/no-such-path"))), *v);
Bindings & bindings(*state->allocBindings(0));
auto v2 = findAlongAttrPath(*state, settings.thisSystem, bindings, *v).first;

2
tests/plugins/local.mk
View file

@ -8,4 +8,4 @@ libplugintest_ALLOW_UNDEFINED := 1
libplugintest_EXCLUDE_FROM_LIBRARY_LIST := 1
libplugintest_CXXFLAGS := -I src/libutil -I src/libstore -I src/libexpr
libplugintest_CXXFLAGS := -I src/libutil -I src/libstore -I src/libexpr -I src/libfetchers