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Add SourceAccessor::getFingerprint()

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This returns the fingerprint for a specific subpath. This is intended
for "composite" accessors like MountedSourceAccessor, where different
subdirectories can have different fingerprints.
This commit is contained in:
Eelco Dolstra 2025-09-22 22:52:18 +02:00 • committed by John Ericson
parent 55c7ef9d40
commit 28d11c5bcc
5 changed files with 50 additions and 0 deletions
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12
src/libutil/union-source-accessor.cc
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@ -72,6 +72,18 @@ struct UnionSourceAccessor : SourceAccessor
}
return std::nullopt;
}
std::pair<CanonPath, std::optional<std::string>> getFingerprint(const CanonPath & path) override
{
if (fingerprint)
return {path, fingerprint};
for (auto & accessor : accessors) {
auto [subpath, fingerprint] = accessor->getFingerprint(path);
if (fingerprint)
return {subpath, fingerprint};
}
return {path, std::nullopt};
}
};
ref<SourceAccessor> makeUnionSourceAccessor(std::vector<ref<SourceAccessor>> && accessors)