mirror of
https://github.com/git/git.git
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0eab8ca68a
git-relink is intended to search for packs and loose objects in common between two repositories and to replace the one set with hard links to the other. Files other than packs and loose objects should not be touched, so add the "info" sub-directory to the pattern of directory excludes. Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil> Signed-off-by: Junio C Hamano <gitster@pobox.com>
173 lines
4 KiB
Perl
Executable file
173 lines
4 KiB
Perl
Executable file
#!/usr/bin/env perl
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# Copyright 2005, Ryan Anderson <ryan@michonline.com>
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# Distribution permitted under the GPL v2, as distributed
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# by the Free Software Foundation.
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# Later versions of the GPL at the discretion of Linus Torvalds
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#
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# Scan two git object-trees, and hardlink any common objects between them.
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use 5.006;
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use strict;
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use warnings;
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use Getopt::Long;
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sub get_canonical_form($);
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sub do_scan_directory($$$);
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sub compare_two_files($$);
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sub usage();
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sub link_two_files($$);
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# stats
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my $total_linked = 0;
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my $total_already = 0;
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my ($linked,$already);
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my $fail_on_different_sizes = 0;
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my $help = 0;
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GetOptions("safe" => \$fail_on_different_sizes,
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"help" => \$help);
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usage() if $help;
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my (@dirs) = @ARGV;
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usage() if (!defined $dirs[0] || !defined $dirs[1]);
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$_ = get_canonical_form($_) foreach (@dirs);
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my $master_dir = pop @dirs;
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opendir(D,$master_dir . "objects/")
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or die "Failed to open $master_dir/objects/ : $!";
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my @hashdirs = grep { ($_ eq 'pack') || /^[0-9a-f]{2}$/ } readdir(D);
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foreach my $repo (@dirs) {
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$linked = 0;
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$already = 0;
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printf("Searching '%s' and '%s' for common objects and hardlinking them...\n",
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$master_dir,$repo);
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foreach my $hashdir (@hashdirs) {
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do_scan_directory($master_dir, $hashdir, $repo);
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}
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printf("Linked %d files, %d were already linked.\n",$linked, $already);
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$total_linked += $linked;
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$total_already += $already;
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}
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printf("Totals: Linked %d files, %d were already linked.\n",
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$total_linked, $total_already);
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sub do_scan_directory($$$) {
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my ($srcdir, $subdir, $dstdir) = @_;
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my $sfulldir = sprintf("%sobjects/%s/",$srcdir,$subdir);
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my $dfulldir = sprintf("%sobjects/%s/",$dstdir,$subdir);
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opendir(S,$sfulldir)
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or die "Failed to opendir $sfulldir: $!";
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foreach my $file (grep(!/\.{1,2}$/, readdir(S))) {
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my $sfilename = $sfulldir . $file;
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my $dfilename = $dfulldir . $file;
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compare_two_files($sfilename,$dfilename);
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}
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closedir(S);
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}
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sub compare_two_files($$) {
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my ($sfilename, $dfilename) = @_;
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# Perl's stat returns relevant information as follows:
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# 0 = dev number
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# 1 = inode number
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# 7 = size
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my @sstatinfo = stat($sfilename);
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my @dstatinfo = stat($dfilename);
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if (@sstatinfo == 0 && @dstatinfo == 0) {
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die sprintf("Stat of both %s and %s failed: %s\n",$sfilename, $dfilename, $!);
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} elsif (@dstatinfo == 0) {
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return;
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}
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if ( ($sstatinfo[0] == $dstatinfo[0]) &&
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($sstatinfo[1] != $dstatinfo[1])) {
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if ($sstatinfo[7] == $dstatinfo[7]) {
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link_two_files($sfilename, $dfilename);
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} else {
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my $err = sprintf("ERROR: File sizes are not the same, cannot relink %s to %s.\n",
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$sfilename, $dfilename);
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if ($fail_on_different_sizes) {
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die $err;
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} else {
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warn $err;
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}
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}
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} elsif ( ($sstatinfo[0] == $dstatinfo[0]) &&
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($sstatinfo[1] == $dstatinfo[1])) {
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$already++;
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}
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}
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sub get_canonical_form($) {
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my $dir = shift;
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my $original = $dir;
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die "$dir is not a directory." unless -d $dir;
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$dir .= "/" unless $dir =~ m#/$#;
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$dir .= ".git/" unless $dir =~ m#\.git/$#;
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die "$original does not have a .git/ subdirectory.\n" unless -d $dir;
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return $dir;
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}
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sub link_two_files($$) {
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my ($sfilename, $dfilename) = @_;
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my $tmpdname = sprintf("%s.old",$dfilename);
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rename($dfilename,$tmpdname)
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or die sprintf("Failure renaming %s to %s: %s",
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$dfilename, $tmpdname, $!);
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if (! link($sfilename,$dfilename)) {
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my $failtxt = "";
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unless (rename($tmpdname,$dfilename)) {
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$failtxt = sprintf(
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"Git Repository containing %s is probably corrupted, " .
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"please copy '%s' to '%s' to fix.\n",
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$tmpdname, $dfilename);
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}
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die sprintf("Failed to link %s to %s: %s\n%s" .
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$sfilename, $dfilename,
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$!, $dfilename, $failtxt);
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}
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unlink($tmpdname)
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or die sprintf("Unlink of %s failed: %s\n",
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$dfilename, $!);
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$linked++;
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}
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sub usage() {
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print("Usage: $0 [--safe] <dir> [<dir> ...] <master_dir> \n");
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print("All directories should contain a .git/objects/ subdirectory.\n");
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print("Options\n");
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print("\t--safe\t" .
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"Stops if two objects with the same hash exist but " .
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"have different sizes. Default is to warn and continue.\n");
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exit(1);
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}
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