281 lines
7.2 KiB
Prolog
Executable file
281 lines
7.2 KiB
Prolog
Executable file
#! /usr/bin/perl -w -I/home/eelco/nix/scripts
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use strict;
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use POSIX qw(tmpnam);
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use readmanifest;
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die unless scalar @ARGV == 5;
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my $cacheDir = $ARGV[0];
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my $patchesDir = $ARGV[1];
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my $patchesURL = $ARGV[2];
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my $srcDir = $ARGV[3];
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my $dstDir = $ARGV[4];
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my $tmpdir;
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do { $tmpdir = tmpnam(); }
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until mkdir $tmpdir, 0777;
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print "TEMP = $tmpdir\n";
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#END { rmdir $tmpdir; }
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my %srcNarFiles;
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my %srcPatches;
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my %srcSuccessors;
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my %dstNarFiles;
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my %dstPatches;
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my %dstSuccessors;
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readManifest "$srcDir/MANIFEST",
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\%srcNarFiles, \%srcPatches, \%srcSuccessors;
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readManifest "$dstDir/MANIFEST",
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\%dstNarFiles, \%dstPatches, \%dstSuccessors;
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sub findOutputPaths {
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my $narFiles = shift;
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my $successors = shift;
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my %outPaths;
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foreach my $p (keys %{$narFiles}) {
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# Ignore store expressions.
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next if ($p =~ /\.store$/);
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# Ignore builders (too much ambiguity -- they're all called
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# `builder.sh').
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next if ($p =~ /\.sh$/);
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next if ($p =~ /\.patch$/);
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# Don't bother including tar files etc.
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next if ($p =~ /\.tar\.(gz|bz2)$/ || $p =~ /\.zip$/ || $p =~ /\.bin$/);
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$outPaths{$p} = 1;
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}
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return %outPaths;
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}
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print "finding src output paths...\n";
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my %srcOutPaths = findOutputPaths \%srcNarFiles, \%srcSuccessors;
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print "finding dst output paths...\n";
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my %dstOutPaths = findOutputPaths \%dstNarFiles, \%dstSuccessors;
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sub getNameVersion {
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my $p = shift;
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$p =~ /\/[0-9a-f]+((?:-[a-zA-Z][^\/-]*)+)([^\/]*)$/;
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my $name = $1;
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my $version = $2;
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$name =~ s/^-//;
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$version =~ s/^-//;
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return ($name, $version);
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}
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# A quick hack to get a measure of the `distance' between two
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# versions: it's just the position of the first character that differs
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# (or 999 if they are the same).
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sub versionDiff {
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my $s = shift;
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my $t = shift;
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my $i;
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return 999 if $s eq $t;
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for ($i = 0; $i < length $s; $i++) {
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return $i if $i >= length $t or
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substr($s, $i, 1) ne substr($t, $i, 1);
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}
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return $i;
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}
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sub getNarBz2 {
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my $narFiles = shift;
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my $storePath = shift;
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my $narFileList = $$narFiles{$storePath};
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die "missing store expression $storePath" unless defined $narFileList;
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my $narFile = @{$narFileList}[0];
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die unless defined $narFile;
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$narFile->{url} =~ /\/([^\/]+)$/;
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die unless defined $1;
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return "$cacheDir/$1";
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}
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sub containsPatch {
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my $patches = shift;
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my $storePath = shift;
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my $basePath = shift;
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my $patchList = $$patches{$storePath};
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return 0 if !defined $patchList;
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my $found = 0;
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foreach my $patch (@{$patchList}) {
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# !!! baseHash might differ
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return 1 if $patch->{basePath} eq $basePath;
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}
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return 0;
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}
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# For each output path in the destination, see if we need to / can
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# create a patch.
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print "creating patches...\n";
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foreach my $p (keys %dstOutPaths) {
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# If exactly the same path already exists in the source, skip it.
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next if defined $srcOutPaths{$p};
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# print " $p\n";
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# If not, then we should find the path in the source that is
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# `most' likely to be present on a system that wants to install
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# this path.
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(my $name, my $version) = getNameVersion $p;
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my @closest = ();
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my $closestVersion;
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my $minDist = -1; # actually, larger means closer
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# Find all source paths with the same name.
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foreach my $q (keys %srcOutPaths) {
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(my $name2, my $version2) = getNameVersion $q;
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if ($name eq $name2) {
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my $dist = versionDiff $version, $version2;
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if ($dist > $minDist) {
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$minDist = $dist;
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@closest = ($q);
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$closestVersion = $version2;
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} elsif ($dist == $minDist) {
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push @closest, $q;
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}
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}
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}
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if (scalar(@closest) == 0) {
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print " NO BASE: $p\n";
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next;
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}
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foreach my $closest (@closest) {
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# Generate a patch between $closest and $p.
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print " $p <- $closest\n";
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# If the patch already exists, skip it.
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if (containsPatch(\%srcPatches, $p, $closest) ||
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containsPatch(\%dstPatches, $p, $closest))
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{
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print " skipping, already exists\n";
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next;
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}
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# next;
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my $srcNarBz2 = getNarBz2 \%srcNarFiles, $closest;
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my $dstNarBz2 = getNarBz2 \%dstNarFiles, $p;
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system("bunzip2 < $srcNarBz2 > $tmpdir/A") == 0
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or die "cannot unpack $srcNarBz2";
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system("bunzip2 < $dstNarBz2 > $tmpdir/B") == 0
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or die "cannot unpack $dstNarBz2";
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system("bsdiff $tmpdir/A $tmpdir/B $tmpdir/DIFF") == 0
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or die "cannot compute binary diff";
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my $baseHash = `nix-hash --flat $tmpdir/A` or die;
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chomp $baseHash;
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my $narHash = `nix-hash --flat $tmpdir/B` or die;
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chomp $narHash;
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my $narDiffHash = `nix-hash --flat $tmpdir/DIFF` or die;
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chomp $narDiffHash;
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my $narDiffSize = (stat "$tmpdir/DIFF")[7];
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my $dstNarBz2Size = (stat $dstNarBz2)[7];
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if ($narDiffSize >= $dstNarBz2Size) {
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print " rejecting; patch bigger than full archive\n";
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next;
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}
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my $finalName =
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"$narDiffHash-$name-$closestVersion-to-$version.nar-bsdiff";
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if (-e "$patchesDir/$finalName") {
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print " not copying, already exists\n";
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next;
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}
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system("cp '$tmpdir/DIFF' '$patchesDir/$finalName.tmp'") == 0
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or die "cannot copy diff";
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rename("$patchesDir/$finalName.tmp", "$patchesDir/$finalName")
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or die "cannot rename $patchesDir/$finalName.tmp";
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# Add the patch to the manifest.
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addPatch \%dstPatches, $p,
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{ url => "$patchesURL/$finalName", hash => $narDiffHash
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, size => $narDiffSize
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, basePath => $closest, baseHash => $baseHash
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, narHash => $narHash, patchType => "nar-bsdiff"
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};
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}
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}
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# Add in any potentially useful patches in the source (namely, those
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# patches that produce either paths in the destination or paths that
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# can be used as the base for other useful patches).
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my $changed;
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do {
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# !!! we repeat this to reach the transitive closure; inefficient
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$changed = 0;
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foreach my $p (keys %srcPatches) {
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my $patchList = $srcPatches{$p};
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my $include = 0;
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# Is path $p included in the destination? If so, include
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# patches that produce it.
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$include = 1 if (defined $dstNarFiles{$p});
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# Is path $p a path that serves as a base for paths in the
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# destination? If so, include patches that produce it.
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foreach my $q (keys %dstPatches) {
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foreach my $patch (@{$dstPatches{$q}}) {
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# !!! check baseHash
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$include = 1 if ($p eq $patch->{basePath});
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}
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}
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if ($include) {
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foreach my $patch (@{$patchList}) {
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$changed = 1 if addPatch \%dstPatches, $p, $patch;
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}
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}
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}
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} while $changed;
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# Rewrite the manifest of the destination (with the new patches).
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writeManifest "$dstDir/MANIFEST",
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\%dstNarFiles, \%dstPatches, \%dstSuccessors;
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