[Backport 2.19-maintenance] Fix crash when NAR is missing from binary cache #9810
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(cherry picked from commit ab786e2)
In the "discard" case (i.e. when the store path already exists
locally), when we call parseDump() from a Finally and it throws an
exception (e.g. if the download of the NAR fails), Nix crashes:
terminate called after throwing an instance of 'nix::SubstituteGone'
what(): error: file 'nar/06br3254rx4gz4cvjzxlv028jrx80zg5i4jr62vjmn416dqihgr7.nar.xz' does not exist in binary cache 'http://localhost'
Aborted (core dumped)
(cherry picked from commit a18d8d6)
In rare cases (e.g. when using allowSubstitutes = false), it's possible that we simultaneously have a DerivationGoal *and* a SubstitutionGoal building the same path. So if a DerivationGoal already built the path while the SubstitutionGoal was waiting for a download slot, it saves us a superfluous download to exit early. (cherry picked from commit dca0a80)
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Automatic backport to
2.19-maintenance, triggered by a label in #9804.