f64bd1231d
git-svn-id: https://nixos.org/repos/nix/release/trunk/channels@34639 70bd8c7a-acb8-0310-9f0d-9cc1c95dcdbb
121 lines
4 KiB
Perl
121 lines
4 KiB
Perl
# This script mirrors a remote Nix channel in the local filesystem.
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# It downloads the remote manifest, then any NAR files that are not
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# already available in the target directory.
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use strict;
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use Nix::Manifest;
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use Nix::GeneratePatches;
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use File::Basename;
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use File::stat;
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if (scalar @ARGV < 4 || scalar @ARGV > 6) {
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print STDERR "Syntax: perl mirror-channel.pl <src-channel-url> <dst-channel-dir> <nar-dir> <nar-url> [<all-patches-manifest [<nix-exprs-url>]]\n";
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exit 1;
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}
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my $curl = "curl --location --no-progress-bar --show-error --fail";
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my $srcChannelURL = $ARGV[0];
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my $dstChannelPath = $ARGV[1];
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my $narPath = $ARGV[2];
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my $narURL = $ARGV[3];
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my $allPatchesManifest = $ARGV[4] || "";
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my $nixexprsURL = $ARGV[5] || "$srcChannelURL/nixexprs.tar.bz2";
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die "$dstChannelPath doesn't exist\n" unless -d $dstChannelPath;
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die "$narPath doesn't exist\n" unless -d $narPath;
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my $manifestPath = "$dstChannelPath/MANIFEST";
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# Fetch the manifest.
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system("$curl '$srcChannelURL/MANIFEST' > $dstChannelPath/MANIFEST") == 0 or die;
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# Mirror nixexprs.tar.bz2.
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system("$curl '$nixexprsURL' > $dstChannelPath/nixexprs.tar.bz2") == 0 or die "cannot download `$nixexprsURL'";
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# Advertise a binary cache.
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open FILE, ">$dstChannelPath/binary-cache-url" or die;
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print FILE "http://nixos.org/binary-cache/" or die;
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close FILE or die;
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# Read the manifest.
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my (%narFiles, %patches);
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readManifest("$dstChannelPath/MANIFEST", \%narFiles, \%patches);
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%patches = (); # not supported yet
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my $size = scalar (keys %narFiles);
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print "$size store paths in manifest\n";
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# Protect against Hydra problems that leave the channel empty.
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die "cowardly refusing to mirror an empty channel" if $size == 0;
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# Download every file that we don't already have, and update every URL
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# to point to the mirror. Also fill in the size and hash fields in
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# the manifest in order to be compatible with Nix < 0.13.
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while (my ($storePath, $files) = each %narFiles) {
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foreach my $file (@{$files}) {
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my $narHash = $file->{narHash};
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my $srcURL = $file->{url};
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my $dstName = $narHash;
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$dstName =~ s/:/_/; # `:' in filenames might cause problems
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my $dstFile = "$narPath/$dstName";
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my $dstURL = "$narURL/$dstName";
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$file->{url} = $dstURL;
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if (! -e $dstFile) {
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print "downloading $srcURL\n";
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my $dstFileTmp = "$narPath/.tmp.$$.nar.$dstName";
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system("$curl '$srcURL' > $dstFileTmp") == 0 or die "failed to download `$srcURL'";
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# Verify whether the downloaded file is a bzipped NAR file
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# that matches the NAR hash given in the manifest.
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my $hash = `bunzip2 < $dstFileTmp | nix-hash --type sha256 --flat /dev/stdin` or die;
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chomp $hash;
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die "hash mismatch in downloaded file `$srcURL'" if "sha256:$hash" ne $file->{narHash};
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rename($dstFileTmp, $dstFile) or die "cannot rename $dstFileTmp";
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}
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$file->{size} = stat($dstFile)->size or die "cannot get size of $dstFile";
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my $hashFile = "$narPath/.hash.$dstName";
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my $hash;
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if (-e $hashFile) {
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open HASH, "<$hashFile" or die;
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$hash = <HASH>;
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close HASH;
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} else {
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$hash = `nix-hash --flat --type sha256 --base32 '$dstFile'` or die;
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chomp $hash;
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open HASH, ">$hashFile" or die;
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print HASH $hash;
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close HASH;
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}
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$file->{hash} = "sha256:$hash";
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}
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}
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# Read all the old patches and propagate the useful ones. We use the
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# file "all-patches" to keep track of all patches that have been
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# generated in the past, so that patches are not lost if (for
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# instance) a package temporarily disappears from the source channel,
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# or if multiple instances of this script are running concurrently.
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my (%dummy, %allPatches);
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readManifest($allPatchesManifest, \%dummy, \%allPatches)
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if $allPatchesManifest ne "" && -f $allPatchesManifest;
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propagatePatches \%allPatches, \%narFiles, \%patches;
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# Make the temporary manifest available.
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writeManifest("$dstChannelPath/MANIFEST", \%narFiles, \%patches);
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