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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 • committed by Mergify
parent 6d53506ae3
commit 651df50996
3 changed files with 30 additions and 7 deletions
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10
src/libfetchers/path.cc
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@ -2,6 +2,8 @@
#include "nix/store/store-api.hh"
#include "nix/util/archive.hh"
#include "nix/fetchers/store-path-accessor.hh"
#include "nix/fetchers/cache.hh"
#include "nix/fetchers/fetch-to-store.hh"
namespace nix::fetchers {
@ -142,6 +144,14 @@ struct PathInputScheme : InputScheme
storePath = store->addToStoreFromDump(*src, "source");
}
// To avoid copying the path again to the /nix/store, we need to add a cache entry.
ContentAddressMethod method = ContentAddressMethod::Raw::NixArchive;
auto fp = getFingerprint(store, input);
if (fp) {
auto cacheKey = makeFetchToStoreCacheKey(input.getName(), *fp, method, "/");
fetchers::getCache()->upsert(cacheKey, *store, {}, *storePath);
}
/* Trust the lastModified value supplied by the user, if
any. It's not a "secure" attribute so we don't care. */
if (!input.getLastModified())