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Merge pull request #6174 from hercules-ci/fetchTree-reuse-local-paths

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fetchTree: Do not re-fetch paths already present + refactor
This commit is contained in:
Théophane Hufschmitt 2022-03-01 10:29:32 +01:00 committed by GitHub
parent 1c985428c4 ee019d0afc
commit 983c991652
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 41 additions and 14 deletions
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8
src/libexpr/eval.cc
View file

@ -517,6 +517,14 @@ void EvalState::allowPath(const StorePath & storePath)
allowedPaths->insert(store->toRealPath(storePath));
}
void EvalState::allowAndSetStorePathString(const StorePath &storePath, Value &v)
{
allowPath(storePath);
auto path = store->printStorePath(storePath);
v.mkString(path, PathSet({path}));
}
Path EvalState::checkSourcePath(const Path & path_)
{
if (!allowedPaths) return path_;

3
src/libexpr/eval.hh
View file

@ -161,6 +161,9 @@ public:
the real store path if `store` is a chroot store. */
void allowPath(const StorePath & storePath);
/* Allow access to a store path and return it as a string. */
void allowAndSetStorePathString(const StorePath & storePath, Value &v);
/* Check whether access to a path is allowed and throw an error if
not. Otherwise return the canonicalised path. */
Path checkSourcePath(const Path & path);

15
src/libexpr/primops.cc
View file

@ -1919,20 +1919,15 @@ static void addPath(
if (expectedHash)
expectedStorePath = state.store->makeFixedOutputPath(method, *expectedHash, name);
Path dstPath;
if (!expectedHash || !state.store->isValidPath(*expectedStorePath)) {
dstPath = state.store->printStorePath(settings.readOnlyMode
StorePath dstPath = settings.readOnlyMode
? state.store->computeStorePathForPath(name, path, method, htSHA256, filter).first
: state.store->addToStore(name, path, method, htSHA256, filter, state.repair, refs));
if (expectedHash && expectedStorePath != state.store->parseStorePath(dstPath))
: state.store->addToStore(name, path, method, htSHA256, filter, state.repair, refs);
if (expectedHash && expectedStorePath != dstPath)
throw Error("store path mismatch in (possibly filtered) path added from '%s'", path);
state.allowAndSetStorePathString(dstPath, v);
} else
dstPath = state.store->printStorePath(*expectedStorePath);
v.mkString(dstPath, {dstPath});
state.allowPath(dstPath);
state.allowAndSetStorePathString(*expectedStorePath, v);
} catch (Error & e) {
e.addTrace(pos, "while adding path '%s'", path);
throw;

21
src/libexpr/primops/fetchTree.cc
View file

@ -203,6 +203,8 @@ static void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
url = state.forceStringNoCtx(*attr.value, *attr.pos);
else if (n == "sha256")
expectedHash = newHashAllowEmpty(state.forceStringNoCtx(*attr.value, *attr.pos), htSHA256);
else if (n == "narHash")
expectedHash = newHashAllowEmpty(state.forceStringNoCtx(*attr.value, *attr.pos), htSHA256);
else if (n == "name")
name = state.forceStringNoCtx(*attr.value, *attr.pos);
else
@ -230,6 +232,20 @@ static void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
if (evalSettings.pureEval && !expectedHash)
throw Error("in pure evaluation mode, '%s' requires a 'sha256' argument", who);
// early exit if pinned and already in the store
if (expectedHash && expectedHash->type == htSHA256) {
auto expectedPath =
unpack
? state.store->makeFixedOutputPath(FileIngestionMethod::Recursive, *expectedHash, name, {})
: state.store->makeFixedOutputPath(FileIngestionMethod::Flat, *expectedHash, name, {});
auto validPaths = state.store->queryValidPaths({expectedPath}, NoSubstitute);
if (!validPaths.empty()) {
state.allowAndSetStorePathString(expectedPath, v);
return;
}
}
auto storePath =
unpack
? fetchers::downloadTarball(state.store, *url, name, (bool) expectedHash).first.storePath
@ -244,10 +260,7 @@ static void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
*url, expectedHash->to_string(Base32, true), hash.to_string(Base32, true));
}
state.allowPath(storePath);
auto path = state.store->printStorePath(storePath);
v.mkString(path, PathSet({path}));
state.allowAndSetStorePathString(storePath, v);
}
static void prim_fetchurl(EvalState & state, const Pos & pos, Value * * args, Value & v)

4
tests/fetchurl.sh
View file

@ -9,6 +9,10 @@ outPath=$(nix-build -vvvvv --expr 'import <nix/fetchurl.nix>' --argstr url file:
cmp $outPath fetchurl.sh
# Do not re-fetch paths already present.
outPath2=$(nix-build -vvvvv --expr 'import <nix/fetchurl.nix>' --argstr url file:///does-not-exist/must-remain-unused/fetchurl.sh --argstr sha256 $hash --no-out-link)
test "$outPath" == "$outPath2"
# Now using a base-64 hash.
clearStore

4
tests/tarball.sh
View file

@ -26,10 +26,14 @@ test_tarball() {
nix-build -o $TEST_ROOT/result '<foo>' -I foo=file://$tarball
nix-build -o $TEST_ROOT/result -E "import (fetchTarball file://$tarball)"
# Do not re-fetch paths already present
nix-build -o $TEST_ROOT/result -E "import (fetchTarball { url = file:///does-not-exist/must-remain-unused/$tarball; sha256 = \"$hash\"; })"
nix-build -o $TEST_ROOT/result -E "import (fetchTree file://$tarball)"
nix-build -o $TEST_ROOT/result -E "import (fetchTree { type = \"tarball\"; url = file://$tarball; })"
nix-build -o $TEST_ROOT/result -E "import (fetchTree { type = \"tarball\"; url = file://$tarball; narHash = \"$hash\"; })"
# Do not re-fetch paths already present
nix-build -o $TEST_ROOT/result -E "import (fetchTree { type = \"tarball\"; url = file:///does-not-exist/must-remain-unused/$tarball; narHash = \"$hash\"; })"
nix-build -o $TEST_ROOT/result -E "import (fetchTree { type = \"tarball\"; url = file://$tarball; narHash = \"sha256-xdKv2pq/IiwLSnBBJXW8hNowI4MrdZfW+SYqDQs7Tzc=\"; })" 2>&1 | grep 'NAR hash mismatch in input'
nix-instantiate --strict --eval -E "!((import (fetchTree { type = \"tarball\"; url = file://$tarball; narHash = \"$hash\"; })) ? submodules)" >&2