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Merge pull request #10612 from edolstra/no-flake-substitution

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Input::fetchToStore(): Don't try to substitute
This commit is contained in:
Eelco Dolstra 2024-09-16 12:47:50 +02:00 committed by GitHub
commit 176334d8be
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6 changed files with 20 additions and 23 deletions
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8
doc/manual/rl-next/no-flake-substitution.md Normal file
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@ -0,0 +1,8 @@
---
synopsis: Flakes are no longer substituted
prs: [10612]
---
Nix will no longer attempt to substitute the source code of flakes from a binary cache. This functionality was broken because it could lead to different evaluation results depending on whether the flake was available in the binary cache, or even depending on whether the flake was already in the local store.
Author: [**@edolstra**](https://github.com/edolstra)

18
src/libfetchers/fetchers.cc
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@ -170,24 +170,6 @@ std::pair<StorePath, Input> Input::fetchToStore(ref<Store> store) const
if (!scheme)
throw Error("cannot fetch unsupported input '%s'", attrsToJSON(toAttrs()));
/* The tree may already be in the Nix store, or it could be
substituted (which is often faster than fetching from the
original source). So check that. */
if (getNarHash()) {
try {
auto storePath = computeStorePath(*store);
store->ensurePath(storePath);
debug("using substituted/cached input '%s' in '%s'",
to_string(), store->printStorePath(storePath));
return {std::move(storePath), *this};
} catch (Error & e) {
debug("substitution of input '%s' failed: %s", to_string(), e.what());
}
}
auto [storePath, input] = [&]() -> std::pair<StorePath, Input> {
try {
auto [accessor, final] = getAccessorUnchecked(store);

3
src/libflake/flake/lockfile.cc
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@ -54,7 +54,8 @@ StorePath LockedNode::computeStorePath(Store & store) const
}
static std::shared_ptr<Node> doFind(const ref<Node>& root, const InputPath & path, std::vector<InputPath>& visited) {
static std::shared_ptr<Node> doFind(const ref<Node> & root, const InputPath & path, std::vector<InputPath> & visited)
{
auto pos = root;
auto found = std::find(visited.cbegin(), visited.cend(), path);

3
tests/functional/flakes/follow-paths.sh
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@ -2,6 +2,9 @@
source ./common.sh
# FIXME: this test is disabled because relative path flakes are broken. Re-enable this in #10089.
exit 0
requireGit
flakeFollowsA=$TEST_ROOT/follows/flakeA

3
tests/functional/tarball.sh
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@ -35,9 +35,6 @@ test_tarball() {
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\"; })"
expectStderr 102 nix-build -o "$TEST_ROOT"/result -E "import (fetchTree { type = \"tarball\"; url = file://$tarball; narHash = \"sha256-xdKv2pq/IiwLSnBBJXW8hNowI4MrdZfW+SYqDQs7Tzc=\"; })" | grep 'NAR hash mismatch in input'
[[ $(nix eval --impure --expr "(fetchTree file://$tarball).lastModified") = 1000000000 ]]

6
tests/nixos/github-flakes.nix
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@ -181,8 +181,14 @@ in
print(out)
info = json.loads(out)
assert info["revision"] == "${private-flake-rev}", f"revision mismatch: {info['revision']} != ${private-flake-rev}"
assert info["fingerprint"]
cat_log()
# Fetching with the resolved URL should produce the same result.
info2 = json.loads(client.succeed(f"nix flake metadata {info['url']} --json --access-tokens github.com=ghp_000000000000000000000000000000000000 --tarball-ttl 0"))
print(info["fingerprint"], info2["fingerprint"])
assert info["fingerprint"] == info2["fingerprint"], "fingerprint mismatch"
client.succeed("nix registry pin nixpkgs")
client.succeed("nix flake metadata nixpkgs --tarball-ttl 0 >&2")