diff options
Diffstat (limited to 'git-difftool.perl')
| -rwxr-xr-x | git-difftool.perl | 101 |
1 files changed, 88 insertions, 13 deletions
diff --git a/git-difftool.perl b/git-difftool.perl index 0a90de4146..e57d3d1295 100755 --- a/git-difftool.perl +++ b/git-difftool.perl @@ -13,9 +13,9 @@ use 5.008; use strict; use warnings; +use Error qw(:try); use File::Basename qw(dirname); use File::Copy; -use File::Compare; use File::Find; use File::stat; use File::Path qw(mkpath rmtree); @@ -83,6 +83,54 @@ sub exit_cleanup exit($status | ($status >> 8)); } +sub use_wt_file +{ + my ($repo, $workdir, $file, $sha1) = @_; + my $null_sha1 = '0' x 40; + + if (! -e "$workdir/$file") { + # If the file doesn't exist in the working tree, we cannot + # use it. + return (0, $null_sha1); + } + + my $wt_sha1 = $repo->command_oneline('hash-object', "$workdir/$file"); + my $use = ($sha1 eq $null_sha1) || ($sha1 eq $wt_sha1); + return ($use, $wt_sha1); +} + +sub changed_files +{ + my ($repo_path, $index, $worktree) = @_; + $ENV{GIT_INDEX_FILE} = $index; + $ENV{GIT_WORK_TREE} = $worktree; + my $must_unset_git_dir = 0; + if (not defined($ENV{GIT_DIR})) { + $must_unset_git_dir = 1; + $ENV{GIT_DIR} = $repo_path; + } + + my @refreshargs = qw/update-index --really-refresh -q --unmerged/; + my @gitargs = qw/diff-files --name-only -z/; + try { + Git::command_oneline(@refreshargs); + } catch Git::Error::Command with {}; + + my $line = Git::command_oneline(@gitargs); + my @files; + if (defined $line) { + @files = split('\0', $line); + } else { + @files = (); + } + + delete($ENV{GIT_INDEX_FILE}); + delete($ENV{GIT_WORK_TREE}); + delete($ENV{GIT_DIR}) if ($must_unset_git_dir); + + return map { $_ => 1 } @files; +} + sub setup_dir_diff { my ($repo, $workdir, $symlinks) = @_; @@ -106,6 +154,7 @@ sub setup_dir_diff my $null_sha1 = '0' x 40; my $lindex = ''; my $rindex = ''; + my $wtindex = ''; my %submodule; my %symlink; my @working_tree = (); @@ -159,10 +208,13 @@ EOF } if ($rmode ne $null_mode) { - if ($rsha1 ne $null_sha1) { - $rindex .= "$rmode $rsha1\t$dst_path\0"; + my ($use, $wt_sha1) = use_wt_file($repo, $workdir, + $dst_path, $rsha1); + if ($use) { + push @working_tree, $dst_path; + $wtindex .= "$rmode $wt_sha1\t$dst_path\0"; } else { - push(@working_tree, $dst_path); + $rindex .= "$rmode $rsha1\t$dst_path\0"; } } } @@ -203,13 +255,21 @@ EOF $rc = system('git', 'checkout-index', '--all', "--prefix=$rdir/"); exit_cleanup($tmpdir, $rc) if $rc != 0; + $ENV{GIT_INDEX_FILE} = "$tmpdir/wtindex"; + ($inpipe, $ctx) = + $repo->command_input_pipe(qw(update-index --info-only -z --index-info)); + print($inpipe $wtindex); + $repo->command_close_pipe($inpipe, $ctx); + # 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 + # not part of the index. Remove any trailing slash from $workdir + # before starting to avoid double slashes in symlink targets. + $workdir =~ s|/$||; for my $file (@working_tree) { my $dir = dirname($file); unless (-d "$rdir/$dir") { @@ -336,7 +396,7 @@ sub main } if ($opts{gui}) { my $guitool = Git::config('diff.guitool'); - if (length($guitool) > 0) { + if (defined($guitool) && length($guitool) > 0) { $ENV{GIT_DIFF_TOOL} = $guitool; } } @@ -373,19 +433,34 @@ sub dir_diff # should be copied back to the working tree. # Do not copy back files when symlinks are used and the # external tool did not replace the original link with a file. + # + # These hashes are loaded lazily since they aren't needed + # in the common case of --symlinks and the difftool updating + # files through the symlink. + my %wt_modified; + my %tmp_modified; + my $indices_loaded = 0; + for my $file (@worktree) { next if $symlinks && -l "$b/$file"; next if ! -f "$b/$file"; - my $diff = compare("$b/$file", "$workdir/$file"); - if ($diff == 0) { - next; - } elsif ($diff == -1) { - my $errmsg = "warning: Could not compare "; - $errmsg += "'$b/$file' with '$workdir/$file'\n"; + if (!$indices_loaded) { + %wt_modified = changed_files($repo->repo_path(), + "$tmpdir/wtindex", "$workdir"); + %tmp_modified = changed_files($repo->repo_path(), + "$tmpdir/wtindex", "$b"); + $indices_loaded = 1; + } + + if (exists $wt_modified{$file} and exists $tmp_modified{$file}) { + my $errmsg = "warning: Both files modified: "; + $errmsg .= "'$workdir/$file' and '$b/$file'.\n"; + $errmsg .= "warning: Working tree file has been left.\n"; + $errmsg .= "warning:\n"; warn $errmsg; $error = 1; - } elsif ($diff == 1) { + } elsif (exists $tmp_modified{$file}) { my $mode = stat("$b/$file")->mode; copy("$b/$file", "$workdir/$file") or exit_cleanup($tmpdir, 1); |