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don't read outputs into memory for output rewriting

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RewritingSink can handle being fed input where a reference crosses a
chunk boundary. we don't need to load the whole source into memory, and
in fact *not* loading the whole source lets nix build FODs that do not
fit into memory (eg fetchurl'ing data files larger than system memory).
This commit is contained in:
pennae 2022-08-19 11:26:26 +02:00
parent 7aa36ae796
commit 7d934f7880
1 changed files with 1 additions and 3 deletions
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4
src/libstore/build/local-derivation-goal.cc
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@ -2374,10 +2374,8 @@ DrvOutputs LocalDerivationGoal::registerOutputs()
if (*scratchPath != finalPath) { if (*scratchPath != finalPath) {
// Also rewrite the output path // Also rewrite the output path
auto source = sinkToSource([&](Sink & nextSink) { auto source = sinkToSource([&](Sink & nextSink) {
StringSink sink;
dumpPath(actualPath, sink);
RewritingSink rsink2(oldHashPart, std::string(finalPath.hashPart()), nextSink); RewritingSink rsink2(oldHashPart, std::string(finalPath.hashPart()), nextSink);
rsink2(sink.s); dumpPath(actualPath, rsink2);
rsink2.flush(); rsink2.flush();
}); });
Path tmpPath = actualPath + ".tmp"; Path tmpPath = actualPath + ".tmp";