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Fix the detection of already built drv outputs

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PRs #4370 and #4348 had a bad interaction in that the second broke the fist
one in a not trivial way.

The issue was that since #4348 the logic for detecting whether a
derivation output is already built requires some logic that was specific
to the `LocalStore`.

It happens though that most of this logic could be upstreamed to any `Store`,
which is what this commit does.
This commit is contained in:
regnat 2020-12-17 11:35:24 +01:00
parent ae3c3e3bb2
commit 4d45839499
6 changed files with 78 additions and 53 deletions
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45
src/libstore/local-store.cc
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@ -877,35 +877,9 @@ StorePathSet LocalStore::queryValidDerivers(const StorePath & path)
});
}
// Try to resolve the derivation at path `original`, with a caching layer
// to make it more efficient
std::optional<Derivation> cachedResolve(
LocalStore& store,
const StorePath& original)
{
// This is quite dirty and leaky, but will disappear once #4340 is merged
static Sync<std::map<StorePath, std::optional<Derivation>>> resolutionsCache;
{
auto resolutions = resolutionsCache.lock();
auto resolvedDrvIter = resolutions->find(original);
if (resolvedDrvIter != resolutions->end()) {
auto & [_, resolvedDrv] = *resolvedDrvIter;
return *resolvedDrv;
}
}
/* Try resolve drv and use that path instead. */
auto drv = store.readDerivation(original);
auto attempt = drv.tryResolve(store);
if (!attempt)
return std::nullopt;
/* Store in memo table. */
resolutionsCache.lock()->insert_or_assign(original, *attempt);
return *attempt;
}
std::map<std::string, std::optional<StorePath>>
LocalStore::queryPartialDerivationOutputMap(const StorePath& path_)
LocalStore::queryDerivationOutputMapNoResolve(const StorePath& path_)
{
auto path = path_;
auto outputs = retrySQLite<std::map<std::string, std::optional<StorePath>>>([&]() {
@ -924,20 +898,9 @@ LocalStore::queryPartialDerivationOutputMap(const StorePath& path_)
if (!settings.isExperimentalFeatureEnabled("ca-derivations"))
return outputs;
auto drv = readDerivation(path);
auto resolvedDrv = cachedResolve(*this, path);
if (!resolvedDrv) {
for (auto& [outputName, _] : drv.outputsAndOptPaths(*this)) {
if (!outputs.count(outputName))
outputs.emplace(outputName, std::nullopt);
}
return outputs;
}
auto resolvedDrvHashes = staticOutputHashes(*this, *resolvedDrv);
for (auto& [outputName, hash] : resolvedDrvHashes) {
auto drv = readInvalidDerivation(path);
auto drvHashes = staticOutputHashes(*this, drv);
for (auto& [outputName, hash] : drvHashes) {
auto realisation = queryRealisation(DrvOutput{hash, outputName});
if (realisation)
outputs.insert_or_assign(outputName, realisation->outPath);