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fetchToStore(): Improve caching in dry-run mode

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In dry-run mode, we don't need to require a valid path.
This commit is contained in:
Eelco Dolstra 2025-06-11 16:13:40 +02:00
parent ac6318c9c5
commit 2f5a545997
3 changed files with 8 additions and 6 deletions
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7
src/libfetchers/cache.cc
View file

@ -122,7 +122,8 @@ struct CacheImpl : Cache
std::optional<ResultWithStorePath> lookupStorePath(
Key key,
Store & store) override
Store & store,
bool allowInvalid) override
{
key.second.insert_or_assign("store", store.storeDir);
@ -135,7 +136,7 @@ struct CacheImpl : Cache
ResultWithStorePath res2(*res, StorePath(storePathS));
store.addTempRoot(res2.storePath);
if (!store.isValidPath(res2.storePath)) {
if (!allowInvalid && !store.isValidPath(res2.storePath)) {
// FIXME: we could try to substitute 'storePath'.
debug("ignoring disappeared cache entry '%s:%s' -> '%s'",
key.first,
@ -157,7 +158,7 @@ struct CacheImpl : Cache
Key key,
Store & store) override
{
auto res = lookupStorePath(std::move(key), store);
auto res = lookupStorePath(std::move(key), store, false);
return res && !res->expired ? res : std::nullopt;
}
};

2
src/libfetchers/fetch-to-store.cc
View file

@ -35,7 +35,7 @@ StorePath fetchToStore(
if (!filter && (fingerprint = path.accessor->getFingerprint(path.path))) {
cacheKey = makeFetchToStoreCacheKey(std::string{name}, *fingerprint, method, path.path.abs());
if (auto res = fetchers::getCache()->lookupStorePath(*cacheKey, store)) {
if (auto res = fetchers::getCache()->lookupStorePath(*cacheKey, store, mode == FetchMode::DryRun)) {
debug("store path cache hit for '%s'", path);
return res->storePath;
}

5
src/libfetchers/include/nix/fetchers/cache.hh
View file

@ -76,11 +76,12 @@ struct Cache
/**
* Look up a store path in the cache. The returned store path will
* be valid, but it may be expired.
* be valid (unless `allowInvalid` is true), but it may be expired.
*/
virtual std::optional<ResultWithStorePath> lookupStorePath(
Key key,
Store & store) = 0;
Store & store,
bool allowInvalid = false) = 0;
/**
* Look up a store path in the cache. Return nothing if its TTL