my $sha1_pattern = qr/[0-9a-fA-F]{40}/; # pattern to validate Git sha1sums
my $dummy_commit_msg = 'dummy commit'; # message to skip in recent changes
-my $no_chdir=0;
+my $git_dir=undef;
-sub import { #{{{
+sub import {
hook(type => "checkconfig", id => "git", call => \&checkconfig);
hook(type => "getsetup", id => "git", call => \&getsetup);
+ hook(type => "genwrapper", id => "git", call => \&genwrapper);
hook(type => "rcs", id => "rcs_update", call => \&rcs_update);
hook(type => "rcs", id => "rcs_prepedit", call => \&rcs_prepedit);
hook(type => "rcs", id => "rcs_commit", call => \&rcs_commit);
hook(type => "rcs", id => "rcs_recentchanges", call => \&rcs_recentchanges);
hook(type => "rcs", id => "rcs_diff", call => \&rcs_diff);
hook(type => "rcs", id => "rcs_getctime", call => \&rcs_getctime);
+ hook(type => "rcs", id => "rcs_getmtime", call => \&rcs_getmtime);
hook(type => "rcs", id => "rcs_receive", call => \&rcs_receive);
-} #}}}
+ hook(type => "rcs", id => "rcs_preprevert", call => \&rcs_preprevert);
+ hook(type => "rcs", id => "rcs_revert", call => \&rcs_revert);
+}
-sub checkconfig () { #{{{
+sub checkconfig () {
if (! defined $config{gitorigin_branch}) {
$config{gitorigin_branch}="origin";
}
push @{$config{wrappers}}, {
wrapper => $config{git_wrapper},
wrappermode => (defined $config{git_wrappermode} ? $config{git_wrappermode} : "06755"),
+ wrapper_background_command => $config{git_wrapper_background_command},
};
}
+
if (defined $config{git_test_receive_wrapper} &&
- length $config{git_test_receive_wrapper}) {
+ length $config{git_test_receive_wrapper} &&
+ defined $config{untrusted_committers} &&
+ @{$config{untrusted_committers}}) {
push @{$config{wrappers}}, {
test_receive => 1,
wrapper => $config{git_test_receive_wrapper},
- wrappermode => "0755",
+ wrappermode => (defined $config{git_wrappermode} ? $config{git_wrappermode} : "06755"),
};
}
-} #}}}
-sub getsetup () { #{{{
+ # Avoid notes, parser does not handle and they only slow things down.
+ $ENV{GIT_NOTES_REF}="";
+
+ # Run receive test only if being called by the wrapper, and not
+ # when generating same.
+ if ($config{test_receive} && ! exists $config{wrapper}) {
+ require IkiWiki::Receive;
+ IkiWiki::Receive::test();
+ }
+}
+
+sub getsetup () {
return
plugin => {
safe => 0, # rcs plugin
rebuild => undef,
+ section => "rcs",
},
git_wrapper => {
type => "string",
safe => 0, # file
rebuild => 0,
},
+ git_wrapper_background_command => {
+ type => "string",
+ example => "git push github",
+ description => "shell command for git_wrapper to run, in the background",
+ safe => 0, # command
+ rebuild => 0,
+ },
git_wrappermode => {
type => "string",
example => '06755',
},
historyurl => {
type => "string",
- example => "http://git.example.com/gitweb.cgi?p=wiki.git;a=history;f=[[file]]",
+ example => "http://git.example.com/gitweb.cgi?p=wiki.git;a=history;f=[[file]];hb=HEAD",
description => "gitweb url to show file history ([[file]] substituted)",
safe => 1,
rebuild => 1,
},
diffurl => {
type => "string",
- example => "http://git.example.com/gitweb.cgi?p=wiki.git;a=blobdiff;h=[[sha1_to]];hp=[[sha1_from]];hb=[[sha1_parent]];f=[[file]]",
- description => "gitweb url to show a diff ([[sha1_to]], [[sha1_from]], [[sha1_parent]], and [[file]] substituted)",
+ example => "http://git.example.com/gitweb.cgi?p=wiki.git;a=blobdiff;f=[[file]];h=[[sha1_to]];hp=[[sha1_from]];hb=[[sha1_commit]];hpb=[[sha1_parent]]",
+ description => "gitweb url to show a diff ([[file]], [[sha1_to]], [[sha1_from]], [[sha1_commit]], and [[sha1_parent]] substituted)",
safe => 1,
rebuild => 1,
},
safe => 0, # paranoia
rebuild => 0,
},
-} #}}}
+}
-sub safe_git (&@) { #{{{
- # Start a child process safely without resorting /bin/sh.
- # Return command output or success state (in scalar context).
+sub genwrapper {
+ if ($config{test_receive}) {
+ require IkiWiki::Receive;
+ return IkiWiki::Receive::genwrapper();
+ }
+ else {
+ return "";
+ }
+}
- my ($error_handler, @cmdline) = @_;
+sub safe_git (&@) {
+ # Start a child process safely without resorting to /bin/sh.
+ # Returns command output (in list content) or success state
+ # (in scalar context), or runs the specified data handler.
+
+ my ($error_handler, $data_handler, @cmdline) = @_;
my $pid = open my $OUT, "-|";
if (!$pid) {
# In child.
# Git commands want to be in wc.
- if (! $no_chdir) {
+ if (! defined $git_dir) {
chdir $config{srcdir}
- or error("Cannot chdir to $config{srcdir}: $!");
+ or error("cannot chdir to $config{srcdir}: $!");
+ }
+ else {
+ chdir $git_dir
+ or error("cannot chdir to $git_dir: $!");
}
exec @cmdline or error("Cannot exec '@cmdline': $!");
}
# In parent.
+ # git output is probably utf-8 encoded, but may contain
+ # other encodings or invalidly encoded stuff. So do not rely
+ # on the normal utf-8 IO layer, decode it by hand.
+ binmode($OUT);
+
my @lines;
while (<$OUT>) {
+ $_=decode_utf8($_, 0);
+
chomp;
- push @lines, $_;
+
+ if (! defined $data_handler) {
+ push @lines, $_;
+ }
+ else {
+ last unless $data_handler->($_);
+ }
}
close $OUT;
return wantarray ? @lines : ($? == 0);
}
# Convenient wrappers.
-sub run_or_die ($@) { safe_git(\&error, @_) }
-sub run_or_cry ($@) { safe_git(sub { warn @_ }, @_) }
-sub run_or_non ($@) { safe_git(undef, @_) }
-#}}}
+sub run_or_die ($@) { safe_git(\&error, undef, @_) }
+sub run_or_cry ($@) { safe_git(sub { warn @_ }, undef, @_) }
+sub run_or_non ($@) { safe_git(undef, undef, @_) }
-sub merge_past ($$$) { #{{{
+
+sub merge_past ($$$) {
# Unlike with Subversion, Git cannot make a 'svn merge -rN:M file'.
# Git merge commands work with the committed changes, except in the
# implicit case of '-m' of git checkout(1). So we should invent a
error("Git merge failed!\n$failure\n") if $failure;
return $conflict;
-} #}}}
+}
-sub parse_diff_tree ($@) { #{{{
+{
+my $prefix;
+sub decode_git_file ($) {
+ my $file=shift;
+
+ # git does not output utf-8 filenames, but instead
+ # double-quotes them with the utf-8 characters
+ # escaped as \nnn\nnn.
+ if ($file =~ m/^"(.*)"$/) {
+ ($file=$1) =~ s/\\([0-7]{1,3})/chr(oct($1))/eg;
+ }
+
+ # strip prefix if in a subdir
+ if (! defined $prefix) {
+ ($prefix) = run_or_die('git', 'rev-parse', '--show-prefix');
+ if (! defined $prefix) {
+ $prefix="";
+ }
+ }
+ $file =~ s/^\Q$prefix\E//;
+
+ return decode("utf8", $file);
+}
+}
+
+sub parse_diff_tree ($) {
# Parse the raw diff tree chunk and return the info hash.
# See git-diff-tree(1) for the syntax.
-
- my ($prefix, $dt_ref) = @_;
+ my $dt_ref = shift;
# End of stream?
return if !defined @{ $dt_ref } ||
$ci{ "${who}_epoch" } = $epoch;
$ci{ "${who}_tz" } = $tz;
- if ($name =~ m/^[^<]+\s+<([^@>]+)/) {
- $ci{"${who}_username"} = $1;
+ if ($name =~ m/^([^<]+)\s+<([^@>]+)/) {
+ $ci{"${who}_name"} = $1;
+ $ci{"${who}_username"} = $2;
}
elsif ($name =~ m/^([^<]+)\s+<>$/) {
$ci{"${who}_username"} = $1;
my $sha1_to = shift(@tmp);
my $status = shift(@tmp);
- # git does not output utf-8 filenames, but instead
- # double-quotes them with the utf-8 characters
- # escaped as \nnn\nnn.
- if ($file =~ m/^"(.*)"$/) {
- ($file=$1) =~ s/\\([0-7]{1,3})/chr(oct($1))/eg;
- }
- $file =~ s/^\Q$prefix\E//;
if (length $file) {
push @{ $ci{'details'} }, {
- 'file' => decode("utf8", $file),
+ 'file' => decode_git_file($file),
'sha1_from' => $sha1_from[0],
'sha1_to' => $sha1_to,
'mode_from' => $mode_from[0],
}
return \%ci;
-} #}}}
+}
-sub git_commit_info ($;$) { #{{{
+sub git_commit_info ($;$) {
# Return an array of commit info hashes of num commits
# starting from the given sha1sum.
my ($sha1, $num) = @_;
my @raw_lines = run_or_die('git', 'log', @opts,
'--pretty=raw', '--raw', '--abbrev=40', '--always', '-c',
'-r', $sha1, '--', '.');
- my ($prefix) = run_or_die('git', 'rev-parse', '--show-prefix');
my @ci;
- while (my $parsed = parse_diff_tree(($prefix or ""), \@raw_lines)) {
+ while (my $parsed = parse_diff_tree(\@raw_lines)) {
push @ci, $parsed;
}
warn "Cannot parse commit info for '$sha1' commit" if !@ci;
return wantarray ? @ci : $ci[0];
-} #}}}
+}
-sub git_sha1 (;$) { #{{{
+sub git_sha1 (;$) {
# Return head sha1sum (of given file).
my $file = shift || q{--};
'--', $file);
if ($sha1) {
($sha1) = $sha1 =~ m/($sha1_pattern)/; # sha1 is untainted now
- } else { debug("Empty sha1sum for '$file'.") }
+ }
+ else {
+ debug("Empty sha1sum for '$file'.");
+ }
return defined $sha1 ? $sha1 : q{};
-} #}}}
+}
-sub rcs_update () { #{{{
+sub rcs_update () {
# Update working directory.
if (length $config{gitorigin_branch}) {
- run_or_cry('git', 'pull', $config{gitorigin_branch});
+ run_or_cry('git', 'pull', '--prune', $config{gitorigin_branch});
}
-} #}}}
+}
-sub rcs_prepedit ($) { #{{{
+sub rcs_prepedit ($) {
# Return the commit sha1sum of the file when editing begins.
# This will be later used in rcs_commit if a merge is required.
my ($file) = @_;
return git_sha1($file);
-} #}}}
+}
-sub rcs_commit ($$$;$$) { #{{{
+sub rcs_commit (@) {
# Try to commit the page; returns undef on _success_ and
# a version of the page with the rcs's conflict markers on
# failure.
-
- my ($file, $message, $rcstoken, $user, $ipaddr) = @_;
+ my %params=@_;
# Check to see if the page has been changed by someone else since
# rcs_prepedit was called.
- my $cur = git_sha1($file);
- my ($prev) = $rcstoken =~ /^($sha1_pattern)$/; # untaint
+ my $cur = git_sha1($params{file});
+ my ($prev) = $params{token} =~ /^($sha1_pattern)$/; # untaint
if (defined $cur && defined $prev && $cur ne $prev) {
- my $conflict = merge_past($prev, $file, $dummy_commit_msg);
+ my $conflict = merge_past($prev, $params{file}, $dummy_commit_msg);
return $conflict if defined $conflict;
}
- rcs_add($file);
- return rcs_commit_staged($message, $user, $ipaddr);
-} #}}}
+ return rcs_commit_helper(@_);
+}
-sub rcs_commit_staged ($$$) {
+sub rcs_commit_staged (@) {
# Commits all staged changes. Changes can be staged using rcs_add,
# rcs_remove, and rcs_rename.
- my ($message, $user, $ipaddr)=@_;
+ return rcs_commit_helper(@_);
+}
- # Set the commit author and email to the web committer.
+sub rcs_commit_helper (@) {
+ my %params=@_;
+
my %env=%ENV;
- if (defined $user || defined $ipaddr) {
- my $u=defined $user ? $user : $ipaddr;
- $ENV{GIT_AUTHOR_NAME}=$u;
- $ENV{GIT_AUTHOR_EMAIL}="$u\@web";
+
+ if (defined $params{session}) {
+ # Set the commit author and email based on web session info.
+ my $u;
+ if (defined $params{session}->param("name")) {
+ $u=$params{session}->param("name");
+ }
+ elsif (defined $params{session}->remote_addr()) {
+ $u=$params{session}->remote_addr();
+ }
+ if (defined $u) {
+ $u=encode_utf8($u);
+ $ENV{GIT_AUTHOR_NAME}=$u;
+ }
+ if (defined $params{session}->param("nickname")) {
+ $u=encode_utf8($params{session}->param("nickname"));
+ $u=~s/\s+/_/g;
+ $u=~s/[^-_0-9[:alnum:]]+//g;
+ }
+ if (defined $u) {
+ $ENV{GIT_AUTHOR_EMAIL}="$u\@web";
+ }
}
- $message = IkiWiki::possibly_foolish_untaint($message);
+ $params{message} = IkiWiki::possibly_foolish_untaint($params{message});
my @opts;
- if ($message !~ /\S/) {
+ if ($params{message} !~ /\S/) {
# Force git to allow empty commit messages.
# (If this version of git supports it.)
my ($version)=`git --version` =~ /git version (.*)/;
push @opts, '--cleanup=verbatim';
}
else {
- $message.=".";
+ $params{message}.=".";
}
}
- push @opts, '-q';
- # git commit returns non-zero if file has not been really changed.
- # so we should ignore its exit status (hence run_or_non).
- if (run_or_non('git', 'commit', @opts, '-m', $message)) {
+ if (exists $params{file}) {
+ push @opts, '--', $params{file};
+ }
+ # git commit returns non-zero if nothing really changed.
+ # So we should ignore its exit status (hence run_or_non).
+ if (run_or_non('git', 'commit', '-m', $params{message}, '-q', @opts)) {
if (length $config{gitorigin_branch}) {
run_or_cry('git', 'push', $config{gitorigin_branch});
}
return undef; # success
}
-sub rcs_add ($) { # {{{
+sub rcs_add ($) {
# Add file to archive.
my ($file) = @_;
run_or_cry('git', 'add', $file);
-} #}}}
+}
-sub rcs_remove ($) { # {{{
+sub rcs_remove ($) {
# Remove file from archive.
my ($file) = @_;
run_or_cry('git', 'rm', '-f', $file);
-} #}}}
+}
-sub rcs_rename ($$) { # {{{
+sub rcs_rename ($$) {
my ($src, $dest) = @_;
run_or_cry('git', 'mv', '-f', $src, $dest);
-} #}}}
+}
-sub rcs_recentchanges ($) { #{{{
+sub rcs_recentchanges ($) {
# List of recent changes.
my ($num) = @_;
$diffurl =~ s/\[\[sha1_parent\]\]/$ci->{'parent'}/go;
$diffurl =~ s/\[\[sha1_from\]\]/$detail->{'sha1_from'}/go;
$diffurl =~ s/\[\[sha1_to\]\]/$detail->{'sha1_to'}/go;
+ $diffurl =~ s/\[\[sha1_commit\]\]/$sha1/go;
push @pages, {
page => pagename($file),
my $user=$ci->{'author_username'};
my $web_commit = ($ci->{'author'} =~ /\@web>/);
-
+ my $nickname;
+
+ # Set nickname only if a non-url author_username is available,
+ # and author_name is an url.
+ if ($user !~ /:\/\// && defined $ci->{'author_name'} &&
+ $ci->{'author_name'} =~ /:\/\//) {
+ $nickname=$user;
+ $user=$ci->{'author_name'};
+ }
+
# compatability code for old web commit messages
if (! $web_commit &&
defined $messages[0] &&
push @rets, {
rev => $sha1,
user => $user,
+ nickname => $nickname,
committype => $web_commit ? "web" : "git",
when => $when,
message => [@messages],
}
return @rets;
-} #}}}
+}
-sub rcs_diff ($) { #{{{
+sub rcs_diff ($;$) {
my $rev=shift;
+ my $maxlines=shift;
my ($sha1) = $rev =~ /^($sha1_pattern)$/; # untaint
my @lines;
- foreach my $line (run_or_non("git", "show", $sha1)) {
- if (@lines || $line=~/^diff --git/) {
- push @lines, $line."\n";
- }
- }
+ my $addlines=sub {
+ my $line=shift;
+ return if defined $maxlines && @lines == $maxlines;
+ push @lines, $line."\n"
+ if (@lines || $line=~/^diff --git/);
+ return 1;
+ };
+ safe_git(undef, $addlines, "git", "show", $sha1);
if (wantarray) {
return @lines;
}
else {
return join("", @lines);
}
-} #}}}
+}
+
+{
+my %time_cache;
-sub rcs_getctime ($) { #{{{
+sub findtimes ($$) {
my $file=shift;
- # Remove srcdir prefix
- $file =~ s/^\Q$config{srcdir}\E\/?//;
+ my $id=shift; # 0 = mtime ; 1 = ctime
+
+ if (! keys %time_cache) {
+ my $date;
+ foreach my $line (run_or_die('git', 'log',
+ '--pretty=format:%at',
+ '--name-only', '--relative')) {
+ if (! defined $date && $line =~ /^(\d+)$/) {
+ $date=$line;
+ }
+ elsif (! length $line) {
+ $date=undef;
+ }
+ else {
+ my $f=decode_git_file($line);
- my $sha1 = git_sha1($file);
- my $ci = git_commit_info($sha1, 1);
- my $ctime = $ci->{'author_epoch'};
- debug("ctime for '$file': ". localtime($ctime));
+ if (! $time_cache{$f}) {
+ $time_cache{$f}[0]=$date; # mtime
+ }
+ $time_cache{$f}[1]=$date; # ctime
+ }
+ }
+ }
- return $ctime;
-} #}}}
+ return exists $time_cache{$file} ? $time_cache{$file}[$id] : 0;
+}
+
+}
+
+sub rcs_getctime ($) {
+ my $file=shift;
-sub rcs_receive () { #{{{
+ return findtimes($file, 1);
+}
+
+sub rcs_getmtime ($) {
+ my $file=shift;
+
+ return findtimes($file, 0);
+}
+
+{
+my $ret;
+sub git_find_root {
# The wiki may not be the only thing in the git repo.
# Determine if it is in a subdirectory by examining the srcdir,
# and its parents, looking for the .git directory.
+
+ return @$ret if defined $ret;
+
my $subdir="";
my $dir=$config{srcdir};
while (! -d "$dir/.git") {
}
}
+ $ret=[$subdir, $dir];
+ return @$ret;
+}
+
+}
+
+sub git_parse_changes {
+ my $reverted = shift;
+ my @changes = @_;
+
+ my ($subdir, $rootdir) = git_find_root();
+ my @rets;
+ foreach my $ci (@changes) {
+ foreach my $detail (@{ $ci->{'details'} }) {
+ my $file = $detail->{'file'};
+
+ # check that all changed files are in the subdir
+ if (length $subdir &&
+ ! ($file =~ s/^\Q$subdir\E//)) {
+ error sprintf(gettext("you are not allowed to change %s"), $file);
+ }
+
+ my ($action, $mode, $path);
+ if ($detail->{'status'} =~ /^[M]+\d*$/) {
+ $action="change";
+ $mode=$detail->{'mode_to'};
+ }
+ elsif ($detail->{'status'} =~ /^[AM]+\d*$/) {
+ $action= $reverted ? "remove" : "add";
+ $mode=$detail->{'mode_to'};
+ }
+ elsif ($detail->{'status'} =~ /^[DAM]+\d*/) {
+ $action= $reverted ? "add" : "remove";
+ $mode=$detail->{'mode_from'};
+ }
+ else {
+ error "unknown status ".$detail->{'status'};
+ }
+
+ # test that the file mode is ok
+ if ($mode !~ /^100[64][64][64]$/) {
+ error sprintf(gettext("you cannot act on a file with mode %s"), $mode);
+ }
+ if ($action eq "change") {
+ if ($detail->{'mode_from'} ne $detail->{'mode_to'}) {
+ error gettext("you are not allowed to change file modes");
+ }
+ }
+
+ # extract attachment to temp file
+ if (($action eq 'add' || $action eq 'change') &&
+ ! pagetype($file)) {
+ eval q{use File::Temp};
+ die $@ if $@;
+ my $fh;
+ ($fh, $path)=File::Temp::tempfile(undef, UNLINK => 1);
+ my $cmd = "cd $git_dir && ".
+ "git show $detail->{sha1_to} > '$path'";
+ if (system($cmd) != 0) {
+ error("failed writing temp file '$path'.");
+ }
+ }
+
+ push @rets, {
+ file => $file,
+ action => $action,
+ path => $path,
+ };
+ }
+ }
+
+ return @rets;
+}
+
+sub rcs_receive () {
my @rets;
while (<>) {
chomp;
my ($oldrev, $newrev, $refname) = split(' ', $_, 3);
-
+
# only allow changes to gitmaster_branch
if ($refname !~ /^refs\/heads\/\Q$config{gitmaster_branch}\E$/) {
error sprintf(gettext("you are not allowed to change %s"), $refname);
}
-
+
# Avoid chdir when running git here, because the changes
# are in the master git repo, not the srcdir repo.
+ # (Also, if a subdir is involved, we don't want to chdir to
+ # it and only see changes in it.)
# The pre-receive hook already puts us in the right place.
- $no_chdir=1;
- my @changes=git_commit_info($oldrev."..".$newrev);
- $no_chdir=0;
-
- foreach my $ci (@changes) {
- foreach my $detail (@{ $ci->{'details'} }) {
- my $file = $detail->{'file'};
-
- # check that all changed files are in the
- # subdir
- if (length $subdir &&
- ! ($file =~ s/^\Q$subdir\E//)) {
- error sprintf(gettext("you are not allowed to change %s"), $file);
- }
+ $git_dir=".";
+ push @rets, git_parse_changes(0, git_commit_info($oldrev."..".$newrev));
+ $git_dir=undef;
+ }
- my ($action, $mode, $path);
- if ($detail->{'status'} =~ /^[M]+\d*$/) {
- $action="change";
- $mode=$detail->{'mode_to'};
- }
- elsif ($detail->{'status'} =~ /^[AM]+\d*$/) {
- $action="add";
- $mode=$detail->{'mode_to'};
- if (! pagetype($file)) {
- eval q{use File::Temp};
- die $@ if $@;
- my $fh;
- ($fh, $path)=File::Temp::tempfile("XXXXXXXXXX", UNLINK => 1);
- if (system("git show ".$detail->{sha1_to}." > '$path'") != 0) {
- error("failed writing temp file");
- }
- }
- }
- elsif ($detail->{'status'} =~ /^[DAM]+\d*/) {
- $action="remove";
- $mode=$detail->{'mode_from'};
- }
- else {
- error "unknown status ".$detail->{'status'};
- }
-
- # test that the file mode is ok
- if ($mode !~ /^100[64][64][64]$/) {
- error sprintf(gettext("you cannot act on a file with mode %s"), $mode);
- }
- if ($action eq "change") {
- if ($detail->{'mode_from'} ne $detail->{'mode_to'}) {
- error gettext("you are not allowed to change file modes");
- }
- }
+ return reverse @rets;
+}
- push @rets, {
- file => $file,
- action => $action,
- path => $path,
- };
- }
- }
+sub rcs_preprevert ($) {
+ my $rev=shift;
+ my ($sha1) = $rev =~ /^($sha1_pattern)$/; # untaint
+
+ # Examine changes from root of git repo, not from any subdir,
+ # in order to see all changes.
+ my ($subdir, $rootdir) = git_find_root();
+ $git_dir=$rootdir;
+
+ my @commits=git_commit_info($sha1, 1);
+ if (! @commits) {
+ error "unknown commit"; # just in case
}
- return reverse @rets;
-} #}}}
+ # git revert will fail on merge commits. Add a nice message.
+ if (exists $commits[0]->{parents} &&
+ @{$commits[0]->{parents}} > 1) {
+ error gettext("you are not allowed to revert a merge");
+ }
+
+ my @ret=git_parse_changes(1, @commits);
+
+ $git_dir=undef;
+ return @ret;
+}
+
+sub rcs_revert ($) {
+ # Try to revert the given rev; returns undef on _success_.
+ my $rev = shift;
+ my ($sha1) = $rev =~ /^($sha1_pattern)$/; # untaint
+
+ if (run_or_non('git', 'revert', '--no-commit', $sha1)) {
+ return undef;
+ }
+ else {
+ run_or_die('git', 'reset', '--hard');
+ return sprintf(gettext("Failed to revert commit %s"), $sha1);
+ }
+}
1