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Fix persistent hash mismatch errors when importing

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This would start happening if the network connection between the Hydra
server and the remote build server breaks after sucessfully importing
at least one output of a derivation, but before having finished
importing all outputs.

Fixes #816.
This commit is contained in:
Ricardo M. Correia 2020-11-10 04:05:59 +01:00
parent 73dfef364b
commit f47749a62d
1 changed files with 10 additions and 2 deletions
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12
src/hydra-queue-runner/build-remote.cc
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@ -481,14 +481,22 @@ void State::buildRemote(ref<Store> destStore,
for (auto & path : pathsSorted) {
auto & info = infos.find(path)->second;
to << cmdDumpStorePath << localStore->printStorePath(path);
to.flush();
/* Receive the NAR from the remote and add it to the
destination store. Meanwhile, extract all the info from the
NAR that getBuildOutput() needs. */
auto source2 = sinkToSource([&](Sink & sink)
{
/* Note: we should only send the command to dump the store
path to the remote if the NAR is actually going to get read
by the destination store, which won't happen if this path
is already valid on the destination store. Since this
lambda function only gets executed if someone tries to read
from source2, we will send the command from here rather
than outside the lambda. */
to << cmdDumpStorePath << localStore->printStorePath(path);
to.flush();
TeeSource tee(from, sink);
extractNarData(tee, localStore->printStorePath(path), narMembers);
});