7ee70fd479
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.
240 lines
8.9 KiB
Perl
Executable file
240 lines
8.9 KiB
Perl
Executable file
#! /usr/bin/env perl
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use strict;
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use warnings;
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use Data::Dumper;
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use Digest::SHA;
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use Fcntl qw(:flock);
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use File::Basename;
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use File::Path;
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use File::Slurp;
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use File::stat;
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use JSON::PP;
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use LWP::UserAgent;
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use List::MoreUtils qw(uniq);
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use Net::Amazon::S3;
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use POSIX qw(strftime);
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my $channelName = $ARGV[0];
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my $releaseUrl = $ARGV[1];
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die "Usage: $0 CHANNEL-NAME RELEASE-URL\n" unless defined $channelName && defined $releaseUrl;
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$channelName =~ /^([a-z]+)-(.*)$/ or die;
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my $channelDirRel = $channelName eq "nixpkgs-unstable" ? "nixpkgs" : "$1/$2";
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# Configuration.
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my $TMPDIR = $ENV{'TMPDIR'} // "/tmp";
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my $channelsDir = "/home/hydra-mirror/channels";
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my $filesCache = "${TMPDIR}/nixos-files.sqlite";
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my $bucketName = "nix-releases";
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$ENV{'GIT_DIR'} = "/home/hydra-mirror/nixpkgs-channels";
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# S3 setup.
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my $aws_access_key_id = $ENV{'AWS_ACCESS_KEY_ID'} or die;
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my $aws_secret_access_key = $ENV{'AWS_SECRET_ACCESS_KEY'} or die;
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my $s3 = Net::Amazon::S3->new(
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{ aws_access_key_id => $aws_access_key_id,
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aws_secret_access_key => $aws_secret_access_key,
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retry => 1,
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host => "s3-eu-west-1.amazonaws.com",
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});
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my $bucket = $s3->bucket($bucketName) or die;
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sub fetch {
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my ($url, $type) = @_;
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my $ua = LWP::UserAgent->new;
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$ua->default_header('Accept', $type) if defined $type;
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my $response = $ua->get($url);
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die "could not download $url: ", $response->status_line, "\n" unless $response->is_success;
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return $response->decoded_content;
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}
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my $releaseInfo = decode_json(fetch($releaseUrl, 'application/json'));
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my $releaseId = $releaseInfo->{id} or die;
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my $releaseName = $releaseInfo->{nixname} or die;
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my $evalId = $releaseInfo->{jobsetevals}->[0] or die;
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my $evalUrl = "https://hydra.nixos.org/eval/$evalId";
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my $evalInfo = decode_json(fetch($evalUrl, 'application/json'));
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my $releasePrefix = "$channelDirRel/$releaseName";
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my $rev = $evalInfo->{jobsetevalinputs}->{nixpkgs}->{revision} or die;
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print STDERR "release is ‘$releaseName’ (build $releaseId), eval is $evalId, prefix is $releasePrefix, Git commit is $rev\n";
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# Guard against the channel going back in time.
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my @curReleaseUrl = split(/\//, read_file("$channelsDir/$channelName", err_mode => 'quiet') // "");
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my $curRelease = pop @curReleaseUrl;
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my $d = `NIX_PATH= nix-instantiate --eval -E "builtins.compareVersions (builtins.parseDrvName \\"$curRelease\\").version (builtins.parseDrvName \\"$releaseName\\").version"`;
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chomp $d;
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if ($d == 1) {
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warn("channel would go back in time from $curRelease to $releaseName, bailing out\n");
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exit;
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}
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exit if $d == 0;
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if ($bucket->head_key("$releasePrefix")) {
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print STDERR "release already exists\n";
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} else {
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my $tmpDir = "$TMPDIR/release-$channelName/$releaseName";
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File::Path::make_path($tmpDir);
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write_file("$tmpDir/src-url", $evalUrl);
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write_file("$tmpDir/git-revision", $rev);
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write_file("$tmpDir/binary-cache-url", "https://cache.nixos.org");
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if (! -e "$tmpDir/store-paths.xz") {
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my $storePaths = decode_json(fetch("$evalUrl/store-paths", 'application/json'));
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write_file("$tmpDir/store-paths", join("\n", uniq(@{$storePaths})) . "\n");
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}
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sub downloadFile {
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my ($jobName, $dstName) = @_;
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my $buildInfo = decode_json(fetch("$evalUrl/job/$jobName", 'application/json'));
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my $srcFile = $buildInfo->{buildproducts}->{1}->{path} or die "job '$jobName' lacks a store path";
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$dstName //= basename($srcFile);
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my $dstFile = "$tmpDir/" . $dstName;
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my $sha256_expected = $buildInfo->{buildproducts}->{1}->{sha256hash} or die;
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if (! -e $dstFile) {
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print STDERR "downloading $srcFile to $dstFile...\n";
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write_file("$dstFile.sha256", "$sha256_expected $dstName");
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system("NIX_REMOTE=https://cache.nixos.org/ nix cat-store '$srcFile' > '$dstFile.tmp'") == 0
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or die "unable to fetch $srcFile\n";
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rename("$dstFile.tmp", $dstFile) or die;
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}
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if (-e "$dstFile.sha256") {
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my $sha256_actual = `nix hash-file --base16 --type sha256 '$dstFile'`;
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chomp $sha256_actual;
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if ($sha256_expected ne $sha256_actual) {
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print STDERR "file $dstFile is corrupt $sha256_expected $sha256_actual\n";
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exit 1;
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}
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}
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}
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if ($channelName =~ /nixos/) {
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downloadFile("nixos.channel", "nixexprs.tar.xz");
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downloadFile("nixos.iso_minimal.x86_64-linux");
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if ($channelName !~ /-small/) {
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downloadFile("nixos.iso_minimal.i686-linux");
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downloadFile("nixos.iso_graphical.x86_64-linux");
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#downloadFile("nixos.iso_graphical.i686-linux");
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downloadFile("nixos.ova.x86_64-linux");
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#downloadFile("nixos.ova.i686-linux");
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}
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} else {
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downloadFile("tarball", "nixexprs.tar.xz");
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}
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# Generate the programs.sqlite database and put it in
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# nixexprs.tar.xz. Also maintain the debug info repository at
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# https://cache.nixos.org/debuginfo.
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if ($channelName =~ /nixos/ && -e "$tmpDir/store-paths") {
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File::Path::make_path("$tmpDir/unpack");
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system("tar", "xfJ", "$tmpDir/nixexprs.tar.xz", "-C", "$tmpDir/unpack") == 0 or die;
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my $exprDir = glob("$tmpDir/unpack/*");
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system("generate-programs-index $filesCache $exprDir/programs.sqlite http://nix-cache.s3.amazonaws.com/ $tmpDir/store-paths $exprDir/nixpkgs") == 0 or die;
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system("index-debuginfo $filesCache s3://nix-cache $tmpDir/store-paths") == 0 or die;
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system("rm -f $tmpDir/nixexprs.tar.xz $exprDir/programs.sqlite-journal") == 0 or die;
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unlink("$tmpDir/nixexprs.tar.xz.sha256");
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system("tar", "cfJ", "$tmpDir/nixexprs.tar.xz", "-C", "$tmpDir/unpack", basename($exprDir)) == 0 or die;
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system("rm -rf $tmpDir/unpack") == 0 or die;
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}
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if (-e "$tmpDir/store-paths") {
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system("xz", "$tmpDir/store-paths") == 0 or die;
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}
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my $now = strftime("%F %T", localtime);
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my $title = "$channelName release $releaseName";
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my $githubLink = "https://github.com/NixOS/nixpkgs-channels/commits/$rev";
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my $html = "<html><head>";
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$html .= "<title>$title</title></head>";
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$html .= "<body><h1>$title</h1>";
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$html .= "<p>Released on $now from <a href='$githubLink'>Git commit <tt>$rev</tt></a> ";
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$html .= "via <a href='$evalUrl'>Hydra evaluation $evalId</a>.</p>";
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$html .= "<table><thead><tr><th>File name</th><th>Size</th><th>SHA-256 hash</th></tr></thead><tbody>";
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# Upload the release to S3.
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for my $fn (sort glob("$tmpDir/*")) {
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my $basename = basename $fn;
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my $key = "$releasePrefix/" . $basename;
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unless (defined $bucket->head_key($key)) {
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print STDERR "mirroring $fn to s3://$bucketName/$key...\n";
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$bucket->add_key_filename(
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$key, $fn,
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{ content_type => $fn =~ /.sha256|src-url|binary-cache-url|git-revision/ ? "text/plain" : "application/octet-stream" })
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or die $bucket->err . ": " . $bucket->errstr;
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}
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next if $basename =~ /.sha256$/;
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my $size = stat($fn)->size;
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my $sha256 = Digest::SHA::sha256_hex(read_file($fn));
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$html .= "<tr>";
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$html .= "<td><a href='/$key'>$basename</a></td>";
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$html .= "<td align='right'>$size</td>";
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$html .= "<td><tt>$sha256</tt></td>";
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$html .= "</tr>";
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}
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$html .= "</tbody></table></body></html>";
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$bucket->add_key($releasePrefix, $html,
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{ content_type => "text/html" })
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or die $bucket->err . ": " . $bucket->errstr;
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File::Path::remove_tree($tmpDir);
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}
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# Prevent concurrent writes to the channels directory.
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open(my $lockfile, ">>", "$channelsDir/.htaccess.lock");
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flock($lockfile, LOCK_EX) or die "cannot acquire channels lock\n";
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# Update the channel.
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my $htaccess = "$channelsDir/.htaccess-$channelName";
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my $target = "https://releases.nixos.org/$releasePrefix";
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write_file($htaccess,
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"Redirect /channels/$channelName $target\n" .
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"Redirect /releases/nixos/channels/$channelName $target\n");
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my $channelLink = "$channelsDir/$channelName";
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if ((read_file($channelLink, err_mode => 'quiet') // "") ne $target) {
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write_file("$channelLink.tmp", "$target");
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rename("$channelLink.tmp", $channelLink) or die;
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}
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system("cat $channelsDir/.htaccess-nix* > $channelsDir/.htaccess.tmp") == 0 or die;
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rename("$channelsDir/.htaccess.tmp", "$channelsDir/.htaccess") or die;
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# Update the nixos-* branch in the nixpkgs repo. Also update the
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# nixpkgs-channels repo for compatibility.
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system("git remote update origin >&2") == 0 or die;
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system("git push origin $rev:refs/heads/$channelName >&2") == 0 or die;
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system("git push channels $rev:refs/heads/$channelName >&2") == 0 or die;
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flock($lockfile, LOCK_UN) or die "cannot release channels lock\n";
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# Upload to nixos.org.
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system("rsync -avx $channelsDir/ hydra-mirror\@nixos.org:/releases/channels/") == 0 or die;
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