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Fix NAR hash checking for fetchGit with lazy tees

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If a NAR hash is specified, we should probably check
it. Unfortunately, for now this has the side effect of forcing NAR
hash checking of any input that has a NAR hash.
This commit is contained in:
Eelco Dolstra 2025-06-12 16:00:29 +02:00
parent b067e6566f
commit fca291afc3
1 changed files with 19 additions and 16 deletions
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35
src/libexpr/paths.cc
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@ -77,25 +77,28 @@ StorePath EvalState::mountInput(
allowPath(storePath); // FIXME: should just whitelist the entire virtual store
std::optional<Hash> _narHash;
auto getNarHash = [&]()
{
if (!_narHash)
// FIXME: use fetchToStore to make it cache this
_narHash = accessor->hashPath(CanonPath::root);
return _narHash;
};
storeFS->mount(CanonPath(store->printStorePath(storePath)), accessor);
if (requireLockable && (!settings.lazyTrees || !input.isLocked()) && !input.getNarHash()) {
// FIXME: use fetchToStore to make it cache this
auto narHash = accessor->hashPath(CanonPath::root);
input.attrs.insert_or_assign("narHash", narHash.to_string(HashFormat::SRI, true));
}
if (requireLockable && (!settings.lazyTrees || !input.isLocked()) && !input.getNarHash())
input.attrs.insert_or_assign("narHash", getNarHash()->to_string(HashFormat::SRI, true));
// FIXME: what to do with the NAR hash in lazy mode?
if (!settings.lazyTrees && originalInput.getNarHash()) {
auto expected = originalInput.computeStorePath(*store);
if (storePath != expected)
throw Error(
(unsigned int) 102,
"NAR hash mismatch in input '%s', expected '%s' but got '%s'",
originalInput.to_string(),
store->printStorePath(storePath),
store->printStorePath(expected));
}
if (originalInput.getNarHash() && *getNarHash() != *originalInput.getNarHash())
throw Error(
(unsigned int) 102,
"NAR hash mismatch in input '%s', expected '%s' but got '%s'",
originalInput.to_string(),
getNarHash()->to_string(HashFormat::SRI, true),
originalInput.getNarHash()->to_string(HashFormat::SRI, true));
return storePath;
}