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mirror-nixos-branch.pl: exit 0 if the channel would go back in time

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Prometheus now has a configured alert if an update job fails for a
while. Going back in time is not so unusual:

1. a hydra evaluation completes with some failed jobs
2. the channel advances to this commit
3. an admin restarts a failed job
4. the channel would go backward because the evaluation is complete

Since it is not a problem, make it a non-problematic exit code.
This commit is contained in:
Graham Christensen 2019-11-15 11:01:22 -05:00
parent fac8ec969e
commit 7ee70fd479
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1 changed files with 5 additions and 1 deletions
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mirror-nixos-branch.pl
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@ -77,7 +77,11 @@ my @curReleaseUrl = split(/\//, read_file("$channelsDir/$channelName", err_mode
my $curRelease = pop @curReleaseUrl;
my $d = `NIX_PATH= nix-instantiate --eval -E "builtins.compareVersions (builtins.parseDrvName \\"$curRelease\\").version (builtins.parseDrvName \\"$releaseName\\").version"`;
chomp $d;
die "channel would go back in time from $curRelease to $releaseName, bailing out\n" if $d == 1;
if ($d == 1) {
warn("channel would go back in time from $curRelease to $releaseName, bailing out\n");
exit;
}
exit if $d == 0;
if ($bucket->head_key("$releasePrefix")) {