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difftool: Handle compare() returning -1

Keep the temporary directory around when compare()
cannot read its input files, which is indicated by -1.

Defer tempdir creation to allow an early exit in setup_dir_diff().
Wrap the rest of the entry points in an exit_cleanup() function
to handle removing temporary files and error reporting.

Print the temporary files' location so that the user can
recover them.

Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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1 parent a4cd5be commit ceb1497a74e75a0c9bd53716b787d33ad6e2397f @davvid davvid committed with gitster Jul 26, 2012
Showing with 68 additions and 31 deletions.
  1. +68 −31 git-difftool.perl
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99 git-difftool.perl
@@ -18,7 +18,7 @@
use File::Compare;
use File::Find;
use File::stat;
-use File::Path qw(mkpath);
+use File::Path qw(mkpath rmtree);
use File::Temp qw(tempdir);
use Getopt::Long qw(:config pass_through);
use Git;
@@ -112,6 +112,18 @@ sub print_tool_help
exit(0);
}
+sub exit_cleanup
+{
+ my ($tmpdir, $status) = @_;
+ my $errno = $!;
+ rmtree($tmpdir);
+ if ($status and $errno) {
+ my ($package, $file, $line) = caller();
+ warn "$file line $line: $errno\n";
+ }
+ exit($status | ($status >> 8));
+}
+
sub setup_dir_diff
{
my ($repo, $workdir, $symlinks) = @_;
@@ -128,13 +140,6 @@ sub setup_dir_diff
my $diffrtn = $diffrepo->command_oneline(@gitargs);
exit(0) if (length($diffrtn) == 0);
- # Setup temp directories
- my $tmpdir = tempdir('git-difftool.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';
@@ -203,6 +208,13 @@ sub setup_dir_diff
}
}
+ # Setup temp directories
+ my $tmpdir = tempdir('git-difftool.XXXXX', CLEANUP => 0, TMPDIR => 1);
+ my $ldir = "$tmpdir/left";
+ my $rdir = "$tmpdir/right";
+ mkpath($ldir) or exit_cleanup($tmpdir, 1);
+ mkpath($rdir) or exit_cleanup($tmpdir, 1);
+
# 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.
@@ -219,16 +231,18 @@ sub setup_dir_diff
$repo->command_input_pipe(qw(update-index -z --index-info));
print($inpipe $lindex);
$repo->command_close_pipe($inpipe, $ctx);
+
my $rc = system('git', 'checkout-index', '--all', "--prefix=$ldir/");
- exit($rc | ($rc >> 8)) if ($rc != 0);
+ exit_cleanup($tmpdir, $rc) 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 ($rc != 0);
+ exit_cleanup($tmpdir, $rc) if $rc != 0;
# If $GIT_DIR was explicitly set just for the update/checkout
# commands, then it should be unset before continuing.
@@ -240,42 +254,55 @@ sub setup_dir_diff
for my $file (@working_tree) {
my $dir = dirname($file);
unless (-d "$rdir/$dir") {
- mkpath("$rdir/$dir") or die $!;
+ mkpath("$rdir/$dir") or
+ exit_cleanup($tmpdir, 1);
}
if ($symlinks) {
- symlink("$workdir/$file", "$rdir/$file") or die $!;
+ symlink("$workdir/$file", "$rdir/$file") or
+ exit_cleanup($tmpdir, 1);
} else {
- copy("$workdir/$file", "$rdir/$file") or die $!;
+ copy("$workdir/$file", "$rdir/$file") or
+ exit_cleanup($tmpdir, 1);
+
my $mode = stat("$workdir/$file")->mode;
- chmod($mode, "$rdir/$file") or die $!;
+ chmod($mode, "$rdir/$file") or
+ exit_cleanup($tmpdir, 1);
}
}
# 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) {
+ my $ok;
if (defined($submodule{$path}{left})) {
- write_to_file("$ldir/$path", "Subproject commit $submodule{$path}{left}");
+ $ok = write_to_file("$ldir/$path",
+ "Subproject commit $submodule{$path}{left}");
}
if (defined($submodule{$path}{right})) {
- write_to_file("$rdir/$path", "Subproject commit $submodule{$path}{right}");
+ $ok = write_to_file("$rdir/$path",
+ "Subproject commit $submodule{$path}{right}");
}
+ exit_cleanup($tmpdir, 1) if not $ok;
}
# 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) {
+ my $ok;
if (defined($symlink{$path}{left})) {
- write_to_file("$ldir/$path", $symlink{$path}{left});
+ $ok = write_to_file("$ldir/$path",
+ $symlink{$path}{left});
}
if (defined($symlink{$path}{right})) {
- write_to_file("$rdir/$path", $symlink{$path}{right});
+ $ok = write_to_file("$rdir/$path",
+ $symlink{$path}{right});
}
+ exit_cleanup($tmpdir, 1) if not $ok;
}
- return ($ldir, $rdir, @working_tree);
+ return ($ldir, $rdir, $tmpdir, @working_tree);
}
sub write_to_file
@@ -286,16 +313,18 @@ sub write_to_file
# Make sure the path to the file exists
my $dir = dirname($path);
unless (-d "$dir") {
- mkpath("$dir") or die $!;
+ mkpath("$dir") or return 0;
}
# If the file already exists in that location, delete it. This
# is required in the case of symbolic links.
- unlink("$path");
+ unlink($path);
- open(my $fh, '>', "$path") or die $!;
+ open(my $fh, '>', $path) or return 0;
print($fh $value);
close($fh);
+
+ return 1;
}
sub main
@@ -366,21 +395,19 @@ sub main
sub dir_diff
{
my ($extcmd, $symlinks) = @_;
-
my $rc;
+ my $error = 0;
my $repo = Git->repository();
-
my $workdir = find_worktree($repo);
- my ($a, $b, @worktree) = setup_dir_diff($repo, $workdir, $symlinks);
+ my ($a, $b, $tmpdir, @worktree) =
+ setup_dir_diff($repo, $workdir, $symlinks);
+
if (defined($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.
@@ -397,13 +424,23 @@ sub dir_diff
my $errmsg = "warning: Could not compare ";
$errmsg += "'$b/$file' with '$workdir/$file'\n";
warn $errmsg;
+ $error = 1;
} elsif ($diff == 1) {
- copy("$b/$file", "$workdir/$file") or die $!;
my $mode = stat("$b/$file")->mode;
- chmod($mode, "$workdir/$file") or die $!;
+ copy("$b/$file", "$workdir/$file") or
+ exit_cleanup($tmpdir, 1);
+
+ chmod($mode, "$workdir/$file") or
+ exit_cleanup($tmpdir, 1);
}
}
- exit(0);
+ if ($error) {
+ warn "warning: Temporary files exist in '$tmpdir'.\n";
+ warn "warning: You may want to cleanup or recover these.\n";
+ exit(1);
+ } else {
+ exit_cleanup($tmpdir, $rc);
+ }
}
sub file_diff

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