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Mount inputs on storeFS to restore fetchToStore() caching

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fetchToStore() caching was broken because it uses the fingerprint of
the accessor, but now that the accessor (typically storeFS) is a
composite (like MountedSourceAccessor or AllowListSourceAccessor),
there was no fingerprint anymore. So fetchToStore now uses the new
getFingerprint() method to get the specific fingerprint for the
subpath.
This commit is contained in:
Eelco Dolstra 2025-09-22 23:04:58 +02:00 • committed by John Ericson
parent ec6d5c7de3
commit 1d130492d7
8 changed files with 69 additions and 50 deletions
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7
src/libexpr/primops/fetchTree.cc
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@ -10,6 +10,7 @@
#include "nix/util/url.hh"
#include "nix/expr/value-to-json.hh"
#include "nix/fetchers/fetch-to-store.hh"
#include "nix/fetchers/input-cache.hh"
#include <nlohmann/json.hpp>
@ -218,11 +219,11 @@ static void fetchTree(
throw Error("input '%s' is not allowed to use the '__final' attribute", input.to_string());
}
auto [storePath, input2] = input.fetchToStore(state.store);
auto cachedInput = state.inputCache->getAccessor(state.store, input, fetchers::UseRegistries::No);
state.allowPath(storePath);
auto storePath = state.mountInput(cachedInput.lockedInput, input, cachedInput.accessor);
emitTreeAttrs(state, storePath, input2, v, params.emptyRevFallback, false);
emitTreeAttrs(state, storePath, cachedInput.lockedInput, v, params.emptyRevFallback, false);
}
static void prim_fetchTree(EvalState & state, const PosIdx pos, Value ** args, Value & v)