X-Git-Url: https://git.ladys.computer/Gitweb/blobdiff_plain/379faf51f0c4e0a073f489fe1bb7f1ea03ecfbd1e153e9be2b62501fba354842..b6e8c0797a7f9937215e75665e77a6c6b87184adf7957c4c1554fd903e381d66:/gitweb.perl diff --git a/gitweb.perl b/gitweb.perl index 1c4a527..245545a 100755 --- a/gitweb.perl +++ b/gitweb.perl @@ -102,6 +102,10 @@ our %feature = ( 'sub' => \&feature_pickaxe, 'override' => 0, 'default' => [1]}, + + 'pathinfo' => { + 'override' => 0, + 'default' => [0]}, ); sub gitweb_check_feature { @@ -155,6 +159,13 @@ sub feature_snapshot { return ($ctype, $suffix, $command); } +sub gitweb_have_snapshot { + my ($ctype, $suffix, $command) = gitweb_check_feature('snapshot'); + my $have_snapshot = (defined $ctype && defined $suffix); + + return $have_snapshot; +} + # To enable system wide have in $GITWEB_CONFIG # $feature{'pickaxe'}{'default'} = [1]; # To have project specific config enable override in $GITWEB_CONFIG @@ -173,6 +184,22 @@ sub feature_pickaxe { return ($_[0]); } +# checking HEAD file with -e is fragile if the repository was +# initialized long time ago (i.e. symlink HEAD) and was pack-ref'ed +# and then pruned. +sub check_head_link { + my ($dir) = @_; + my $headfile = "$dir/HEAD"; + return ((-e $headfile) || + (-l $headfile && readlink($headfile) =~ /^refs\/heads\//)); +} + +sub check_export_ok { + my ($dir) = @_; + return (check_head_link($dir) && + (!$export_ok || -e "$dir/$export_ok")); +} + # rename detection options for git-diff and git-diff-tree # - default is '-M', with the cost proportional to # (number of removed files) * (number of new files). @@ -200,11 +227,12 @@ if (defined $action) { } } +# parameters which are pathnames our $project = $cgi->param('p'); if (defined $project) { - if (!validate_input($project) || + if (!validate_pathname($project) || !(-d "$projectroot/$project") || - !(-e "$projectroot/$project/HEAD") || + !check_head_link("$projectroot/$project") || ($export_ok && !(-e "$projectroot/$project/$export_ok")) || ($strict_export && !project_in_list($project))) { undef $project; @@ -212,38 +240,50 @@ if (defined $project) { } } -# We have to handle those containing any characters: our $file_name = $cgi->param('f'); +if (defined $file_name) { + if (!validate_pathname($file_name)) { + die_error(undef, "Invalid file parameter"); + } +} + our $file_parent = $cgi->param('fp'); +if (defined $file_parent) { + if (!validate_pathname($file_parent)) { + die_error(undef, "Invalid file parent parameter"); + } +} +# parameters which are refnames our $hash = $cgi->param('h'); if (defined $hash) { - if (!validate_input($hash)) { + if (!validate_refname($hash)) { die_error(undef, "Invalid hash parameter"); } } our $hash_parent = $cgi->param('hp'); if (defined $hash_parent) { - if (!validate_input($hash_parent)) { + if (!validate_refname($hash_parent)) { die_error(undef, "Invalid hash parent parameter"); } } our $hash_base = $cgi->param('hb'); if (defined $hash_base) { - if (!validate_input($hash_base)) { + if (!validate_refname($hash_base)) { die_error(undef, "Invalid hash base parameter"); } } our $hash_parent_base = $cgi->param('hpb'); if (defined $hash_parent_base) { - if (!validate_input($hash_parent_base)) { + if (!validate_refname($hash_parent_base)) { die_error(undef, "Invalid hash parent base parameter"); } } +# other parameters our $page = $cgi->param('pg'); if (defined $page) { if ($page =~ m/[^0-9]/) { @@ -269,11 +309,11 @@ sub evaluate_path_info { # find which part of PATH_INFO is project $project = $path_info; $project =~ s,/+$,,; - while ($project && !-e "$projectroot/$project/HEAD") { + while ($project && !check_head_link("$projectroot/$project")) { $project =~ s,/*[^/]*$,,; } # validate project - $project = validate_input($project); + $project = validate_pathname($project); if (!$project || ($export_ok && !-e "$projectroot/$project/$export_ok") || ($strict_export && !project_in_list($project))) { @@ -294,12 +334,12 @@ sub evaluate_path_info { } else { $action ||= "blob_plain"; } - $hash_base ||= validate_input($refname); - $file_name ||= $pathname; + $hash_base ||= validate_refname($refname); + $file_name ||= validate_pathname($pathname); } elsif (defined $refname) { # we got "project.git/branch" $action ||= "shortlog"; - $hash ||= validate_input($refname); + $hash ||= validate_refname($refname); } } evaluate_path_info(); @@ -355,6 +395,7 @@ exit; sub href(%) { my %params = @_; + my $href = $my_uri; my @mapping = ( project => "p", @@ -373,6 +414,19 @@ sub href(%) { $params{'project'} = $project unless exists $params{'project'}; + my ($use_pathinfo) = gitweb_check_feature('pathinfo'); + if ($use_pathinfo) { + # use PATH_INFO for project name + $href .= "/$params{'project'}" if defined $params{'project'}; + delete $params{'project'}; + + # Summary just uses the project path URL + if (defined $params{'action'} && $params{'action'} eq 'summary') { + delete $params{'action'}; + } + } + + # now encode the parameters explicitly my @result = (); for (my $i = 0; $i < @mapping; $i += 2) { my ($name, $symbol) = ($mapping[$i], $mapping[$i+1]); @@ -380,23 +434,43 @@ sub href(%) { push @result, $symbol . "=" . esc_param($params{$name}); } } - return "$my_uri?" . join(';', @result); + $href .= "?" . join(';', @result) if scalar @result; + + return $href; } ## ====================================================================== ## validation, quoting/unquoting and escaping -sub validate_input { - my $input = shift; +sub validate_pathname { + my $input = shift || return undef; - if ($input =~ m/^[0-9a-fA-F]{40}$/) { - return $input; + # no '.' or '..' as elements of path, i.e. no '.' nor '..' + # at the beginning, at the end, and between slashes. + # also this catches doubled slashes + if ($input =~ m!(^|/)(|\.|\.\.)(/|$)!) { + return undef; } - if ($input =~ m/(^|\/)(|\.|\.\.)($|\/)/) { + # no null characters + if ($input =~ m!\0!) { return undef; } - if ($input =~ m/[^a-zA-Z0-9_\x80-\xff\ \t\.\/\-\+\#\~\%]/) { + return $input; +} + +sub validate_refname { + my $input = shift || return undef; + + # textual hashes are O.K. + if ($input =~ m/^[0-9a-fA-F]{40}$/) { + return $input; + } + # it must be correct pathname + $input = validate_pathname($input) + or return undef; + # restrictions on ref name according to git-check-ref-format + if ($input =~ m!(/\.|\.\.|[\000-\040\177 ~^:?*\[]|/$)!) { return undef; } return $input; @@ -412,12 +486,22 @@ sub esc_param { return $str; } +# quote unsafe chars in whole URL, so some charactrs cannot be quoted +sub esc_url { + my $str = shift; + $str =~ s/([^A-Za-z0-9\-_.~();\/;?:@&=])/sprintf("%%%02X", ord($1))/eg; + $str =~ s/\+/%2B/g; + $str =~ s/ /\+/g; + return $str; +} + # replace invalid utf8 character with SUBSTITUTION sequence sub esc_html { my $str = shift; $str = decode("utf8", $str, Encode::FB_DEFAULT); $str = escapeHTML($str); $str =~ s/\014/^L/g; # escape FORM FEED (FF) character (e.g. in COPYING file) + $str =~ s/\033/^[/g; # "escape" ESCAPE (\e) character (e.g. commit 20a3847d8a5032ce41f90dcc68abfb36e6fee9b1) return $str; } @@ -768,8 +852,7 @@ sub git_get_projects_list { my $subdir = substr($File::Find::name, $pfxlen + 1); # we check related file in $projectroot - if (-e "$projectroot/$subdir/HEAD" && (!$export_ok || - -e "$projectroot/$subdir/$export_ok")) { + if (check_export_ok("$projectroot/$subdir")) { push @list, { path => $subdir }; $File::Find::prune = 1; } @@ -790,8 +873,7 @@ sub git_get_projects_list { if (!defined $path) { next; } - if (-e "$projectroot/$path/HEAD" && (!$export_ok || - -e "$projectroot/$path/$export_ok")) { + if (check_export_ok("$projectroot/$path")) { my $pr = { path => $path, owner => decode("utf8", $owner, Encode::FB_DEFAULT), @@ -1328,7 +1410,7 @@ EOF "" . "\"git\"" . "\n"; - print $cgi->a({-href => esc_param($home_link)}, $home_link_str) . " / "; + print $cgi->a({-href => esc_url($home_link)}, $home_link_str) . " / "; if (defined $project) { print $cgi->a({-href => href(action=>"summary")}, esc_html($project)); if (defined $action) { @@ -1625,9 +1707,9 @@ sub git_print_tree_entry { "history"); } print " | " . - $cgi->a({-href => href(action=>"blob_plain", - hash=>$t->{'hash'}, file_name=>"$basedir$t->{'name'}")}, - "raw"); + $cgi->a({-href => href(action=>"blob_plain", hash_base=>$hash_base, + file_name=>"$basedir$t->{'name'}")}, + "raw"); print "\n"; } elsif ($t->{'type'} eq "tree") { @@ -1659,7 +1741,7 @@ sub git_difftree_body { print "\n"; print "\n"; - my $alternate = 0; + my $alternate = 1; my $patchno = 0; foreach my $line (@{$difftree}) { my %diff = parse_difftree_raw_line($line); @@ -1692,47 +1774,42 @@ sub git_difftree_body { my $mode_chng = "[new $to_file_type"; $mode_chng .= " with mode: $to_mode_str" if $to_mode_str; $mode_chng .= "]"; - print "\n" . - "\n" . - "\n"; + print "\n"; + print "\n"; } elsif ($diff{'status'} eq "D") { # deleted my $mode_chng = "[deleted $from_file_type]"; - print "\n" . - "\n" . - "\n"; + print "\n"; + print "\n"; + file_name=>$diff{'file'})}, + "history"); + print "\n"; } elsif ($diff{'status'} eq "M" || $diff{'status'} eq "T") { # modified, or type changed my $mode_chnge = ""; @@ -1751,42 +1828,32 @@ sub git_difftree_body { $mode_chnge .= "]\n"; } print "\n" . - "\n" . - "\n"; + print "\n"; + print "\n"; } elsif ($diff{'status'} eq "R" || $diff{'status'} eq "C") { # renamed or copied @@ -1806,25 +1873,27 @@ sub git_difftree_body { hash=>$diff{'from_id'}, file_name=>$diff{'from_file'}), -class => "list"}, esc_html($diff{'from_file'})) . " with " . (int $diff{'similarity'}) . "% similarity$mode_chng]\n" . - "\n"; } # we should not encounter Unmerged (U) or Unknown (X) status @@ -1966,7 +2035,7 @@ sub git_shortlog_body { $to = $#{$revlist} if (!defined $to || $#{$revlist} < $to); print "
" . - $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'}, + print ""; + print $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'}, hash_base=>$hash, file_name=>$diff{'file'}), - -class => "list"}, esc_html($diff{'file'})) . - "$mode_chng" . - $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'}, - hash_base=>$hash, file_name=>$diff{'file'})}, - "blob"); + -class => "list"}, esc_html($diff{'file'})); + print "$mode_chng"; if ($action eq 'commitdiff') { # link to patch $patchno++; - print " | " . - $cgi->a({-href => "#patch$patchno"}, "patch"); + print $cgi->a({-href => "#patch$patchno"}, "patch"); } print "" . - $cgi->a({-href => href(action=>"blob", hash=>$diff{'from_id'}, + print ""; + print $cgi->a({-href => href(action=>"blob", hash=>$diff{'from_id'}, hash_base=>$parent, file_name=>$diff{'file'}), - -class => "list"}, esc_html($diff{'file'})) . - "$mode_chng" . - $cgi->a({-href => href(action=>"blob", hash=>$diff{'from_id'}, - hash_base=>$parent, file_name=>$diff{'file'})}, - "blob") . - " | "; + -class => "list"}, esc_html($diff{'file'})); + print "$mode_chng"; if ($action eq 'commitdiff') { # link to patch $patchno++; - print " | " . - $cgi->a({-href => "#patch$patchno"}, "patch"); + print $cgi->a({-href => "#patch$patchno"}, "patch"); + print " | "; } + print $cgi->a({-href => href(action=>"blame", hash_base=>$parent, + file_name=>$diff{'file'})}, + "blame") . " | "; print $cgi->a({-href => href(action=>"history", hash_base=>$parent, - file_name=>$diff{'file'})}, - "history") . - ""; - if ($diff{'to_id'} ne $diff{'from_id'}) { # modified - print $cgi->a({-href => href(action=>"blobdiff", - hash=>$diff{'to_id'}, hash_parent=>$diff{'from_id'}, - hash_base=>$hash, hash_parent_base=>$parent, - file_name=>$diff{'file'}), - -class => "list"}, esc_html($diff{'file'})); - } else { # only mode changed - print $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'}, - hash_base=>$hash, file_name=>$diff{'file'}), - -class => "list"}, esc_html($diff{'file'})); - } - print "$mode_chnge" . - $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'}, - hash_base=>$hash, file_name=>$diff{'file'})}, - "blob"); + print $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'}, + hash_base=>$hash, file_name=>$diff{'file'}), + -class => "list"}, esc_html($diff{'file'})); + print "$mode_chnge"; if ($diff{'to_id'} ne $diff{'from_id'}) { # modified if ($action eq 'commitdiff') { # link to patch $patchno++; - print " | " . - $cgi->a({-href => "#patch$patchno"}, "patch"); + print $cgi->a({-href => "#patch$patchno"}, "patch"); } else { - print " | " . - $cgi->a({-href => href(action=>"blobdiff", - hash=>$diff{'to_id'}, hash_parent=>$diff{'from_id'}, - hash_base=>$hash, hash_parent_base=>$parent, - file_name=>$diff{'file'})}, - "diff"); + print $cgi->a({-href => href(action=>"blobdiff", + hash=>$diff{'to_id'}, hash_parent=>$diff{'from_id'}, + hash_base=>$hash, hash_parent_base=>$parent, + file_name=>$diff{'file'})}, + "diff"); } + print " | "; } - print " | " . - $cgi->a({-href => href(action=>"history", - hash_base=>$hash, file_name=>$diff{'file'})}, - "history"); + print $cgi->a({-href => href(action=>"blame", hash_base=>$hash, + file_name=>$diff{'file'})}, + "blame") . " | "; + print $cgi->a({-href => href(action=>"history", hash_base=>$hash, + file_name=>$diff{'file'})}, + "history"); print "" . - $cgi->a({-href => href(action=>"blob", hash_base=>$hash, - hash=>$diff{'to_id'}, file_name=>$diff{'to_file'})}, - "blob"); + ""; if ($diff{'to_id'} ne $diff{'from_id'}) { if ($action eq 'commitdiff') { # link to patch $patchno++; - print " | " . - $cgi->a({-href => "#patch$patchno"}, "patch"); + print $cgi->a({-href => "#patch$patchno"}, "patch"); } else { - print " | " . - $cgi->a({-href => href(action=>"blobdiff", - hash=>$diff{'to_id'}, hash_parent=>$diff{'from_id'}, - hash_base=>$hash, hash_parent_base=>$parent, - file_name=>$diff{'to_file'}, file_parent=>$diff{'from_file'})}, - "diff"); + print $cgi->a({-href => href(action=>"blobdiff", + hash=>$diff{'to_id'}, hash_parent=>$diff{'from_id'}, + hash_base=>$hash, hash_parent_base=>$parent, + file_name=>$diff{'to_file'}, file_parent=>$diff{'from_file'})}, + "diff"); } + print " | "; } + print $cgi->a({-href => href(action=>"blame", hash_base=>$parent, + file_name=>$diff{'from_file'})}, + "blame") . " | "; + print $cgi->a({-href => href(action=>"history", hash_base=>$parent, + file_name=>$diff{'from_file'})}, + "history"); print "
\n"; - my $alternate = 0; + my $alternate = 1; for (my $i = $from; $i <= $to; $i++) { my $commit = $revlist->[$i]; #my $ref = defined $refs ? format_ref_marker($refs, $commit) : ''; @@ -1986,9 +2055,9 @@ sub git_shortlog_body { href(action=>"commit", hash=>$commit), $ref); print "\n" . "\n" . "\n"; } @@ -2008,7 +2077,7 @@ sub git_history_body { $to = $#{$revlist} unless (defined $to && $to <= $#{$revlist}); print "
" . - $cgi->a({-href => href(action=>"commit", hash=>$commit)}, "commit") . " | " . $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff") . " | " . - $cgi->a({-href => href(action=>"tree", hash=>$commit, hash_base=>$commit)}, "tree"); + $cgi->a({-href => href(action=>"tree", hash=>$commit, hash_base=>$commit)}, "tree") . " | " . + $cgi->a({-href => href(action=>"snapshot", hash=>$commit)}, "snapshot"); print "
\n"; - my $alternate = 0; + my $alternate = 1; for (my $i = $from; $i <= $to; $i++) { if ($revlist->[$i] !~ m/^([0-9a-fA-F]{40})/) { next; @@ -2037,9 +2106,8 @@ sub git_history_body { href(action=>"commit", hash=>$commit), $ref); print "\n" . "
" . - $cgi->a({-href => href(action=>"commit", hash=>$commit)}, "commit") . " | " . - $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff") . " | " . - $cgi->a({-href => href(action=>$ftype, hash_base=>$commit, file_name=>$file_name)}, $ftype); + $cgi->a({-href => href(action=>$ftype, hash_base=>$commit, file_name=>$file_name)}, $ftype) . " | " . + $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff"); if ($ftype eq 'blob') { my $blob_current = git_get_hash_by_path($hash_base, $file_name); @@ -2072,7 +2140,7 @@ sub git_tags_body { $to = $#{$taglist} if (!defined $to || $#{$taglist} < $to); print "\n"; - my $alternate = 0; + my $alternate = 1; for (my $i = $from; $i <= $to; $i++) { my $entry = $taglist->[$i]; my %tag = %$entry; @@ -2132,7 +2200,7 @@ sub git_heads_body { $to = $#{$headlist} if (!defined $to || $#{$headlist} < $to); print "
\n"; - my $alternate = 0; + my $alternate = 1; for (my $i = $from; $i <= $to; $i++) { my $entry = $headlist->[$i]; my %tag = %$entry; @@ -2248,7 +2316,7 @@ sub git_project_list { } print "\n" . "\n"; - my $alternate = 0; + my $alternate = 1; foreach my $pr (@projects) { if ($alternate) { print "\n"; @@ -2280,7 +2348,7 @@ sub git_project_index { print $cgi->header( -type => 'text/plain', -charset => 'utf-8', - -content_disposition => qq(inline; filename="index.aux")); + -content_disposition => 'inline; filename="index.aux"'); foreach my $pr (@projects) { if (!exists $pr->{'owner'}) { @@ -2439,7 +2507,7 @@ sub git_blame2 { print <
- + HTML while (<$fd>) { /^([0-9a-fA-F]{40}).*?(\d+)\)\s{1}(\s*.*)/; @@ -2447,8 +2515,6 @@ HTML my $rev = substr($full_rev, 0, 8); my $lineno = $2; my $data = $3; - my %pco = parse_commit($full_rev); - my $parent = $pco{'parent'}; if (!defined $last_rev) { $last_rev = $full_rev; @@ -2457,25 +2523,11 @@ HTML $current_color = ++$current_color % $num_colors; } print "\n"; - # Print the Prev link - print "\n"; - # Print the Diff (blobdiff) link - print "\n"; - # Print the Commit link print "\n"; - # Print the Line number print "\n"; - # Print the Data print "\n"; print "\n"; } @@ -2642,7 +2694,7 @@ sub git_blob_plain { print $cgi->header( -type => "$type", -expires=>$expires, - -content_disposition => "inline; filename=\"$save_as\""); + -content_disposition => 'inline; filename="' . "$save_as" . '"'); undef $/; binmode STDOUT, ':raw'; print <$fd>; @@ -2726,17 +2778,16 @@ sub git_blob { } sub git_tree { - my ($ctype, $suffix, $command) = gitweb_check_feature('snapshot'); - my $have_snapshot = (defined $ctype && defined $suffix); + my $have_snapshot = gitweb_have_snapshot(); + if (!defined $hash_base) { + $hash_base = "HEAD"; + } if (!defined $hash) { - $hash = git_get_head_hash($project); if (defined $file_name) { - my $base = $hash_base || $hash; - $hash = git_get_hash_by_path($base, $file_name, "tree"); - } - if (!defined $hash_base) { - $hash_base = $hash; + $hash = git_get_hash_by_path($hash_base, $file_name, "tree"); + } else { + $hash = $hash_base; } } $/ = "\0"; @@ -2782,7 +2833,7 @@ sub git_tree { git_print_page_path($file_name, 'tree', $hash_base); print "
\n"; print "
PrevDiffCommitLineData
CommitLineData
"; - print $cgi->a({-href => href(action=>"blame", hash_base=>$parent, file_name=>$file_name)}, - esc_html(substr($parent, 0, 8))); - print ""; - print $cgi->a({-href => href(action=>"blobdiff", file_name=>$file_name, hash_parent_base=>$parent, - hash_base=>$full_rev)}, - esc_html("Diff")); - print "" . $cgi->a({-href => href(action=>"commit", hash=>$full_rev, file_name=>$file_name)}, esc_html($rev)) . "" . esc_html($lineno) . "" . esc_html($data) . "
\n"; - my $alternate = 0; + my $alternate = 1; foreach my $line (@entries) { my %t = parse_ls_tree_line($line, -z => 1); @@ -2803,7 +2854,6 @@ sub git_tree { } sub git_snapshot { - my ($ctype, $suffix, $command) = gitweb_check_feature('snapshot'); my $have_snapshot = (defined $ctype && defined $suffix); if (!$have_snapshot) { @@ -2816,10 +2866,11 @@ sub git_snapshot { my $filename = basename($project) . "-$hash.tar.$suffix"; - print $cgi->header(-type => 'application/x-tar', - -content_encoding => $ctype, - -content_disposition => "inline; filename=\"$filename\"", - -status => '200 OK'); + print $cgi->header( + -type => 'application/x-tar', + -content_encoding => $ctype, + -content_disposition => 'inline; filename="' . "$filename" . '"', + -status => '200 OK'); my $git_command = git_cmd_str(); open my $fd, "-|", "$git_command tar-tree $hash \'$project\' | $command" or @@ -2912,12 +2963,10 @@ sub git_commit { my $refs = git_get_references(); my $ref = format_ref_marker($refs, $co{'id'}); - my ($ctype, $suffix, $command) = gitweb_check_feature('snapshot'); - my $have_snapshot = (defined $ctype && defined $suffix); + my $have_snapshot = gitweb_have_snapshot(); my @views_nav = (); if (defined $file_name && defined $co{'parent'}) { - my $parent = $co{'parent'}; push @views_nav, $cgi->a({-href => href(action=>"blame", hash_parent=>$parent, file_name=>$file_name)}, "blame"); @@ -3129,7 +3178,7 @@ sub git_blobdiff { -type => 'text/plain', -charset => 'utf-8', -expires => $expires, - -content_disposition => qq(inline; filename=") . quotemeta($file_name) . qq(.patch")); + -content_disposition => 'inline; filename="' . "$file_name" . '.patch"'); print "X-Git-Url: " . $cgi->self_url() . "\n\n"; @@ -3232,7 +3281,7 @@ sub git_commitdiff { -type => 'text/plain', -charset => 'utf-8', -expires => $expires, - -content_disposition => qq(inline; filename="$filename")); + -content_disposition => 'inline; filename="' . "$filename" . '"'); my %ad = parse_date($co{'author_epoch'}, $co{'author_tz'}); print <\n"; - my $alternate = 0; + my $alternate = 1; if ($commit_search) { $/ = "\0"; open my $fd, "-|", git_cmd(), "rev-list", "--header", "--parents", $hash or next;