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create cache entry for paths already in the nix store

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This allows path:/nix/store/* paths to not be copied twice to the nix
store.

(cherry picked from commit 61c6210dbf)
This commit is contained in:
Jörg Thalheim 2025-04-03 13:27:39 +02:00
parent b47bd02a6a
commit 2a4e2ecd89
3 changed files with 30 additions and 6 deletions
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22
src/libfetchers/fetch-to-store.cc
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@ -4,6 +4,21 @@
namespace nix {
fetchers::Cache::Key makeFetchToStoreCacheKey(
const std::string &name,
const std::string &fingerprint,
ContentAddressMethod method,
const std::string &path)
{
return fetchers::Cache::Key{"fetchToStore", {
{"name", name},
{"fingerprint", fingerprint},
{"method", std::string{method.render()}},
{"path", path}
}};
}
StorePath fetchToStore(
Store & store,
const SourcePath & path,
@ -19,12 +34,7 @@ StorePath fetchToStore(
std::optional<fetchers::Cache::Key> cacheKey;
if (!filter && path.accessor->fingerprint) {
cacheKey = fetchers::Cache::Key{"fetchToStore", {
{"name", std::string{name}},
{"fingerprint", *path.accessor->fingerprint},
{"method", std::string{method.render()}},
{"path", path.path.abs()}
}};
cacheKey = makeFetchToStoreCacheKey(std::string{name}, *path.accessor->fingerprint, method, path.path.abs());
if (auto res = fetchers::getCache()->lookupStorePath(*cacheKey, store)) {
debug("store path cache hit for '%s'", path);
return res->storePath;