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git/git-difftool.perl
Tim Henigan 05df532655 difftool: only copy back files modified during directory diff
When 'difftool --dir-diff' is used to compare working tree files,
it always copies files from the tmp dir back to the working tree
when the diff tool is closed, even if the files were not modified
by the diff tool.

This causes the file timestamp to change. Files should only be
copied from the tmp dir back to the working copy if they were
actually modified.

Signed-off-by: Tim Henigan <tim.henigan@gmail.com>
Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-07-19 10:33:44 -07:00

365 lines
9.9 KiB
Perl
Executable File

#!/usr/bin/perl
# Copyright (c) 2009, 2010 David Aguilar
# Copyright (c) 2012 Tim Henigan
#
# This is a wrapper around the GIT_EXTERNAL_DIFF-compatible
# git-difftool--helper script.
#
# This script exports GIT_EXTERNAL_DIFF and GIT_PAGER for use by git.
# The GIT_DIFF* variables are exported for use by git-difftool--helper.
#
# Any arguments that are unknown to this script are forwarded to 'git diff'.
use 5.008;
use strict;
use warnings;
use File::Basename qw(dirname);
use File::Copy;
use File::Compare;
use File::Find;
use File::stat;
use File::Path qw(mkpath);
use File::Temp qw(tempdir);
use Getopt::Long qw(:config pass_through);
use Git;
my @tools;
my @working_tree;
my $rc;
my $repo = Git->repository();
my $repo_path = $repo->repo_path();
sub usage
{
my $exitcode = shift;
print << 'USAGE';
usage: git difftool [-t|--tool=<tool>] [--tool-help]
[-x|--extcmd=<cmd>]
[-g|--gui] [--no-gui]
[--prompt] [-y|--no-prompt]
[-d|--dir-diff]
['git diff' options]
USAGE
exit($exitcode);
}
sub find_worktree
{
# Git->repository->wc_path() does not honor changes to the working
# tree location made by $ENV{GIT_WORK_TREE} or the 'core.worktree'
# config variable.
my $worktree;
my $env_worktree = $ENV{GIT_WORK_TREE};
my $core_worktree = Git::config('core.worktree');
if (defined($env_worktree) and (length($env_worktree) > 0)) {
$worktree = $env_worktree;
} elsif (defined($core_worktree) and (length($core_worktree) > 0)) {
$worktree = $core_worktree;
} else {
$worktree = $repo->wc_path();
}
return $worktree;
}
my $workdir = find_worktree();
sub filter_tool_scripts
{
if (-d $_) {
if ($_ ne ".") {
# Ignore files in subdirectories
$File::Find::prune = 1;
}
} else {
if ((-f $_) && ($_ ne "defaults")) {
push(@tools, $_);
}
}
}
sub print_tool_help
{
my ($cmd, @found, @notfound);
my $gitpath = Git::exec_path();
find(\&filter_tool_scripts, "$gitpath/mergetools");
foreach my $tool (@tools) {
$cmd = "TOOL_MODE=diff";
$cmd .= ' && . "$(git --exec-path)/git-mergetool--lib"';
$cmd .= " && get_merge_tool_path $tool >/dev/null 2>&1";
$cmd .= " && can_diff >/dev/null 2>&1";
if (system('sh', '-c', $cmd) == 0) {
push(@found, $tool);
} else {
push(@notfound, $tool);
}
}
print "'git difftool --tool=<tool>' may be set to one of the following:\n";
print "\t$_\n" for (sort(@found));
print "\nThe following tools are valid, but not currently available:\n";
print "\t$_\n" for (sort(@notfound));
print "\nNOTE: Some of the tools listed above only work in a windowed\n";
print "environment. If run in a terminal-only session, they will fail.\n";
exit(0);
}
sub setup_dir_diff
{
# Run the diff; exit immediately if no diff found
# 'Repository' and 'WorkingCopy' must be explicitly set to insure that
# if $GIT_DIR and $GIT_WORK_TREE are set in ENV, they are actually used
# by Git->repository->command*.
my $diffrepo = Git->repository(Repository => $repo_path, WorkingCopy => $workdir);
my $diffrtn = $diffrepo->command_oneline('diff', '--raw', '--no-abbrev', '-z', @ARGV);
exit(0) if (length($diffrtn) == 0);
# Setup temp directories
my $tmpdir = tempdir('git-diffall.XXXXX', CLEANUP => 1, TMPDIR => 1);
my $ldir = "$tmpdir/left";
my $rdir = "$tmpdir/right";
mkpath($ldir) or die $!;
mkpath($rdir) or die $!;
# Build index info for left and right sides of the diff
my $submodule_mode = '160000';
my $symlink_mode = '120000';
my $null_mode = '0' x 6;
my $null_sha1 = '0' x 40;
my $lindex = '';
my $rindex = '';
my %submodule;
my %symlink;
my @rawdiff = split('\0', $diffrtn);
my $i = 0;
while ($i < $#rawdiff) {
if ($rawdiff[$i] =~ /^::/) {
print "Combined diff formats ('-c' and '--cc') are not supported in directory diff mode.\n";
exit(1);
}
my ($lmode, $rmode, $lsha1, $rsha1, $status) = split(' ', substr($rawdiff[$i], 1));
my $src_path = $rawdiff[$i + 1];
my $dst_path;
if ($status =~ /^[CR]/) {
$dst_path = $rawdiff[$i + 2];
$i += 3;
} else {
$dst_path = $src_path;
$i += 2;
}
if (($lmode eq $submodule_mode) or ($rmode eq $submodule_mode)) {
$submodule{$src_path}{left} = $lsha1;
if ($lsha1 ne $rsha1) {
$submodule{$dst_path}{right} = $rsha1;
} else {
$submodule{$dst_path}{right} = "$rsha1-dirty";
}
next;
}
if ($lmode eq $symlink_mode) {
$symlink{$src_path}{left} = $diffrepo->command_oneline('show', "$lsha1");
}
if ($rmode eq $symlink_mode) {
$symlink{$dst_path}{right} = $diffrepo->command_oneline('show', "$rsha1");
}
if (($lmode ne $null_mode) and ($status !~ /^C/)) {
$lindex .= "$lmode $lsha1\t$src_path\0";
}
if ($rmode ne $null_mode) {
if ($rsha1 ne $null_sha1) {
$rindex .= "$rmode $rsha1\t$dst_path\0";
} else {
push(@working_tree, $dst_path);
}
}
}
# If $GIT_DIR is not set prior to calling 'git update-index' and
# 'git checkout-index', then those commands will fail if difftool
# is called from a directory other than the repo root.
my $must_unset_git_dir = 0;
if (not defined($ENV{GIT_DIR})) {
$must_unset_git_dir = 1;
$ENV{GIT_DIR} = $repo_path;
}
# Populate the left and right directories based on each index file
my ($inpipe, $ctx);
$ENV{GIT_INDEX_FILE} = "$tmpdir/lindex";
($inpipe, $ctx) = $repo->command_input_pipe(qw/update-index -z --index-info/);
print($inpipe $lindex);
$repo->command_close_pipe($inpipe, $ctx);
$rc = system('git', 'checkout-index', '--all', "--prefix=$ldir/");
exit($rc | ($rc >> 8)) if ($rc != 0);
$ENV{GIT_INDEX_FILE} = "$tmpdir/rindex";
($inpipe, $ctx) = $repo->command_input_pipe(qw/update-index -z --index-info/);
print($inpipe $rindex);
$repo->command_close_pipe($inpipe, $ctx);
$rc = system('git', 'checkout-index', '--all', "--prefix=$rdir/");
exit($rc | ($rc >> 8)) if ($rc != 0);
# If $GIT_DIR was explicitly set just for the update/checkout
# commands, then it should be unset before continuing.
delete($ENV{GIT_DIR}) if ($must_unset_git_dir);
delete($ENV{GIT_INDEX_FILE});
# Changes in the working tree need special treatment since they are
# not part of the index
for my $file (@working_tree) {
my $dir = dirname($file);
unless (-d "$rdir/$dir") {
mkpath("$rdir/$dir") or die $!;
}
copy("$workdir/$file", "$rdir/$file") or die $!;
chmod(stat("$workdir/$file")->mode, "$rdir/$file") or die $!;
}
# Changes to submodules require special treatment. This loop writes a
# temporary file to both the left and right directories to show the
# change in the recorded SHA1 for the submodule.
for my $path (keys %submodule) {
if (defined($submodule{$path}{left})) {
write_to_file("$ldir/$path", "Subproject commit $submodule{$path}{left}");
}
if (defined($submodule{$path}{right})) {
write_to_file("$rdir/$path", "Subproject commit $submodule{$path}{right}");
}
}
# Symbolic links require special treatment. The standard "git diff"
# shows only the link itself, not the contents of the link target.
# This loop replicates that behavior.
for my $path (keys %symlink) {
if (defined($symlink{$path}{left})) {
write_to_file("$ldir/$path", $symlink{$path}{left});
}
if (defined($symlink{$path}{right})) {
write_to_file("$rdir/$path", $symlink{$path}{right});
}
}
return ($ldir, $rdir);
}
sub write_to_file
{
my $path = shift;
my $value = shift;
# Make sure the path to the file exists
my $dir = dirname($path);
unless (-d "$dir") {
mkpath("$dir") or die $!;
}
# If the file already exists in that location, delete it. This
# is required in the case of symbolic links.
unlink("$path");
open(my $fh, '>', "$path") or die $!;
print($fh $value);
close($fh);
}
# parse command-line options. all unrecognized options and arguments
# are passed through to the 'git diff' command.
my ($difftool_cmd, $dirdiff, $extcmd, $gui, $help, $prompt, $tool_help);
GetOptions('g|gui!' => \$gui,
'd|dir-diff' => \$dirdiff,
'h' => \$help,
'prompt!' => \$prompt,
'y' => sub { $prompt = 0; },
't|tool:s' => \$difftool_cmd,
'tool-help' => \$tool_help,
'x|extcmd:s' => \$extcmd);
if (defined($help)) {
usage(0);
}
if (defined($tool_help)) {
print_tool_help();
}
if (defined($difftool_cmd)) {
if (length($difftool_cmd) > 0) {
$ENV{GIT_DIFF_TOOL} = $difftool_cmd;
} else {
print "No <tool> given for --tool=<tool>\n";
usage(1);
}
}
if (defined($extcmd)) {
if (length($extcmd) > 0) {
$ENV{GIT_DIFFTOOL_EXTCMD} = $extcmd;
} else {
print "No <cmd> given for --extcmd=<cmd>\n";
usage(1);
}
}
if ($gui) {
my $guitool = '';
$guitool = Git::config('diff.guitool');
if (length($guitool) > 0) {
$ENV{GIT_DIFF_TOOL} = $guitool;
}
}
# In directory diff mode, 'git-difftool--helper' is called once
# to compare the a/b directories. In file diff mode, 'git diff'
# will invoke a separate instance of 'git-difftool--helper' for
# each file that changed.
if (defined($dirdiff)) {
my ($a, $b) = setup_dir_diff();
if (defined($extcmd)) {
$rc = system($extcmd, $a, $b);
} else {
$ENV{GIT_DIFFTOOL_DIRDIFF} = 'true';
$rc = system('git', 'difftool--helper', $a, $b);
}
exit($rc | ($rc >> 8)) if ($rc != 0);
# If the diff including working copy files and those
# files were modified during the diff, then the changes
# should be copied back to the working tree
for my $file (@working_tree) {
if (-e "$b/$file" && compare("$b/$file", "$workdir/$file")) {
copy("$b/$file", "$workdir/$file") or die $!;
chmod(stat("$b/$file")->mode, "$workdir/$file") or die $!;
}
}
} else {
if (defined($prompt)) {
if ($prompt) {
$ENV{GIT_DIFFTOOL_PROMPT} = 'true';
} else {
$ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
}
}
$ENV{GIT_PAGER} = '';
$ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper';
# ActiveState Perl for Win32 does not implement POSIX semantics of
# exec* system call. It just spawns the given executable and finishes
# the starting program, exiting with code 0.
# system will at least catch the errors returned by git diff,
# allowing the caller of git difftool better handling of failures.
my $rc = system('git', 'diff', @ARGV);
exit($rc | ($rc >> 8));
}