diff options
Diffstat (limited to 'contrib/examples/git-rerere.perl')
| -rwxr-xr-x | contrib/examples/git-rerere.perl | 284 |
1 files changed, 0 insertions, 284 deletions
diff --git a/contrib/examples/git-rerere.perl b/contrib/examples/git-rerere.perl deleted file mode 100755 index 4f69209..0000000 --- a/contrib/examples/git-rerere.perl +++ /dev/null @@ -1,284 +0,0 @@ -#!/usr/bin/perl -# -# REuse REcorded REsolve. This tool records a conflicted automerge -# result and its hand resolution, and helps to resolve future -# automerge that results in the same conflict. -# -# To enable this feature, create a directory 'rr-cache' under your -# .git/ directory. - -use Digest; -use File::Path; -use File::Copy; - -my $git_dir = $::ENV{GIT_DIR} || ".git"; -my $rr_dir = "$git_dir/rr-cache"; -my $merge_rr = "$git_dir/rr-cache/MERGE_RR"; - -my %merge_rr = (); - -sub read_rr { - if (!-f $merge_rr) { - %merge_rr = (); - return; - } - my $in; - local $/ = "\0"; - open $in, "<$merge_rr" or die "$!: $merge_rr"; - while (<$in>) { - chomp; - my ($name, $path) = /^([0-9a-f]{40})\t(.*)$/s; - $merge_rr{$path} = $name; - } - close $in; -} - -sub write_rr { - my $out; - open $out, ">$merge_rr" or die "$!: $merge_rr"; - for my $path (sort keys %merge_rr) { - my $name = $merge_rr{$path}; - print $out "$name\t$path\0"; - } - close $out; -} - -sub compute_conflict_name { - my ($path) = @_; - my @side = (); - my $in; - open $in, "<$path" or die "$!: $path"; - - my $sha1 = Digest->new("SHA-1"); - my $hunk = 0; - while (<$in>) { - if (/^<<<<<<< .*/) { - $hunk++; - @side = ([], undef); - } - elsif (/^=======$/) { - $side[1] = []; - } - elsif (/^>>>>>>> .*/) { - my ($one, $two); - $one = join('', @{$side[0]}); - $two = join('', @{$side[1]}); - if ($two le $one) { - ($one, $two) = ($two, $one); - } - $sha1->add($one); - $sha1->add("\0"); - $sha1->add($two); - $sha1->add("\0"); - @side = (); - } - elsif (@side == 0) { - next; - } - elsif (defined $side[1]) { - push @{$side[1]}, $_; - } - else { - push @{$side[0]}, $_; - } - } - close $in; - return ($sha1->hexdigest, $hunk); -} - -sub record_preimage { - my ($path, $name) = @_; - my @side = (); - my ($in, $out); - open $in, "<$path" or die "$!: $path"; - open $out, ">$name" or die "$!: $name"; - - while (<$in>) { - if (/^<<<<<<< .*/) { - @side = ([], undef); - } - elsif (/^=======$/) { - $side[1] = []; - } - elsif (/^>>>>>>> .*/) { - my ($one, $two); - $one = join('', @{$side[0]}); - $two = join('', @{$side[1]}); - if ($two le $one) { - ($one, $two) = ($two, $one); - } - print $out "<<<<<<<\n"; - print $out $one; - print $out "=======\n"; - print $out $two; - print $out ">>>>>>>\n"; - @side = (); - } - elsif (@side == 0) { - print $out $_; - } - elsif (defined $side[1]) { - push @{$side[1]}, $_; - } - else { - push @{$side[0]}, $_; - } - } - close $out; - close $in; -} - -sub find_conflict { - my $in; - local $/ = "\0"; - my $pid = open($in, '-|'); - die "$!" unless defined $pid; - if (!$pid) { - exec(qw(git ls-files -z -u)) or die "$!: ls-files"; - } - my %path = (); - my @path = (); - while (<$in>) { - chomp; - my ($mode, $sha1, $stage, $path) = - /^([0-7]+) ([0-9a-f]{40}) ([123])\t(.*)$/s; - $path{$path} |= (1 << $stage); - } - close $in; - while (my ($path, $status) = each %path) { - if ($status == 14) { push @path, $path; } - } - return @path; -} - -sub merge { - my ($name, $path) = @_; - record_preimage($path, "$rr_dir/$name/thisimage"); - unless (system('git', 'merge-file', map { "$rr_dir/$name/${_}image" } - qw(this pre post))) { - my $in; - open $in, "<$rr_dir/$name/thisimage" or - die "$!: $name/thisimage"; - my $out; - open $out, ">$path" or die "$!: $path"; - while (<$in>) { print $out $_; } - close $in; - close $out; - return 1; - } - return 0; -} - -sub garbage_collect_rerere { - # We should allow specifying these from the command line and - # that is why the caller gives @ARGV to us, but I am lazy. - - my $cutoff_noresolve = 15; # two weeks - my $cutoff_resolve = 60; # two months - my @to_remove; - while (<$rr_dir/*/preimage>) { - my ($dir) = /^(.*)\/preimage$/; - my $cutoff = ((-f "$dir/postimage") - ? $cutoff_resolve - : $cutoff_noresolve); - my $age = -M "$_"; - if ($cutoff <= $age) { - push @to_remove, $dir; - } - } - if (@to_remove) { - rmtree(\@to_remove); - } -} - --d "$rr_dir" || exit(0); - -read_rr(); - -if (@ARGV) { - my $arg = shift @ARGV; - if ($arg eq 'clear') { - for my $path (keys %merge_rr) { - my $name = $merge_rr{$path}; - if (-d "$rr_dir/$name" && - ! -f "$rr_dir/$name/postimage") { - rmtree(["$rr_dir/$name"]); - } - } - unlink $merge_rr; - } - elsif ($arg eq 'status') { - for my $path (keys %merge_rr) { - print $path, "\n"; - } - } - elsif ($arg eq 'diff') { - for my $path (keys %merge_rr) { - my $name = $merge_rr{$path}; - system('diff', ((@ARGV == 0) ? ('-u') : @ARGV), - '-L', "a/$path", '-L', "b/$path", - "$rr_dir/$name/preimage", $path); - } - } - elsif ($arg eq 'gc') { - garbage_collect_rerere(@ARGV); - } - else { - die "$0 unknown command: $arg\n"; - } - exit 0; -} - -my %conflict = map { $_ => 1 } find_conflict(); - -# MERGE_RR records paths with conflicts immediately after merge -# failed. Some of the conflicted paths might have been hand resolved -# in the working tree since then, but the initial run would catch all -# and register their preimages. - -for my $path (keys %conflict) { - # This path has conflict. If it is not recorded yet, - # record the pre-image. - if (!exists $merge_rr{$path}) { - my ($name, $hunk) = compute_conflict_name($path); - next unless ($hunk); - $merge_rr{$path} = $name; - if (! -d "$rr_dir/$name") { - mkpath("$rr_dir/$name", 0, 0777); - print STDERR "Recorded preimage for '$path'\n"; - record_preimage($path, "$rr_dir/$name/preimage"); - } - } -} - -# Now some of the paths that had conflicts earlier might have been -# hand resolved. Others may be similar to a conflict already that -# was resolved before. - -for my $path (keys %merge_rr) { - my $name = $merge_rr{$path}; - - # We could resolve this automatically if we have images. - if (-f "$rr_dir/$name/preimage" && - -f "$rr_dir/$name/postimage") { - if (merge($name, $path)) { - print STDERR "Resolved '$path' using previous resolution.\n"; - # Then we do not have to worry about this path - # anymore. - delete $merge_rr{$path}; - next; - } - } - - # Let's see if we have resolved it. - (undef, my $hunk) = compute_conflict_name($path); - next if ($hunk); - - print STDERR "Recorded resolution for '$path'.\n"; - copy($path, "$rr_dir/$name/postimage"); - # And we do not have to worry about this path anymore. - delete $merge_rr{$path}; -} - -# Write out the rest. -write_rr(); |