diff options
author | Martin Langhoff <martin@catalyst.net.nz> | 2005-10-13 21:47:42 +0400 |
---|---|---|
committer | Junio C Hamano <junkio@cox.net> | 2005-10-13 21:47:42 +0400 |
commit | 8af12741ee0e35f43b3180b435cd33642c183e97 (patch) | |
tree | 4f8cd585074c7c36e084ada622952f5e9aa6a2b5 /git-findtags.perl | |
parent | 35613ba4ba967ff408f1b32275f4ebcd51c98097 (diff) |
Add findtags - reworked
A short perl script that will walk the tag refs, tag objects, and even commit
objects in its quest to figure out whether the given SHA1 (for a commit or
tree) was ever tagged.
This version is reworked incorporating sanity, feature and style fixes from
Junio.
Usage: git-findtags.perl [ -t ] <commit-or-tree-sha1>
Signed-off-by: Martin Langhoff <martin@catalyst.net.nz>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Diffstat (limited to 'git-findtags.perl')
-rwxr-xr-x | git-findtags.perl | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/git-findtags.perl b/git-findtags.perl new file mode 100755 index 0000000000..745affe3a6 --- /dev/null +++ b/git-findtags.perl @@ -0,0 +1,94 @@ +#!/usr/bin/perl -w +# +# Copyright (c) 2005 Martin Langhoff +# +# Walk the tags and find if they match a commit +# expects a SHA1 of a commit. Option -t enables +# searching trees too. +# + +use strict; +use File::Basename; +use File::Find; +use Getopt::Std; + +my $git_dir = $ENV{GIT_DIR} || '.git'; +$git_dir =~ s|/$||; # chomp trailing slash + +# options +our $opt_t; +getopts("t") || usage(); + +my @tagfiles = `find $git_dir/refs/tags -follow -type f`; # haystack +my $target = shift @ARGV; # needle +unless ($target) { + usage(); +} + +# drive the processing from the find hook +# slower, safer (?) than the find utility +find( { wanted => \&process, + no_chdir => 1, + follow => 1, + }, "$git_dir/refs/tags"); + + +sub process { + my ($dev,$ino,$mode,$nlink,$uid,$gid); + + # process only regular files + unless ((($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) && -f _) { + return 1; # ignored anyway + } + + my $tagfile = $_; + chomp $tagfile; + my $tagname = substr($tagfile, length($git_dir.'/refs/tags/')); + + my $tagid = quickread($tagfile); + chomp $tagid; + + # is it just a soft tag? + if ($tagid eq $target) { + print "$tagname\n"; + return 1; # done with this tag + } + + # grab the first 2 lines (the whole tag could be large) + my $tagobj = `git-cat-file tag $tagid | head -n2 `; + if ($tagobj =~ m/^type commit$/m) { # only deal with commits + + if ($tagobj =~ m/^object $target$/m) { # match on the commit + print "$tagname\n"; + + } elsif ( $opt_t && # follow the commit + $tagobj =~ m/^object (\S+)$/m) { # and try to match trees + my $commitid = $1; + my $commitobj = `git-cat-file commit $commitid | head -n1`; + chomp $commitobj; + $commitobj =~ m/^tree (\S+)$/; + my $treeid = $1; + if ($target eq $treeid) { + print "$tagname\n"; + } + } + } +} + +sub quickread { + my $file = shift; + local $/; # undef: slurp mode + open FILE, "<$file" + or die "Cannot open $file : $!"; + my $content = <FILE>; + close FILE; + return $content; +} + +sub usage { + print STDERR <<END; +Usage: ${\basename $0} # find tags for a commit or tree + [ -t ] <commit-or-tree-sha1> +END + exit(1); +} |