use strict;
use IkiWiki;
use Encode;
+use File::Path qw{remove_tree};
use URI::Escape q{uri_escape_utf8};
use open qw{:utf8 :std};
}
}
-my $git_dir=undef;
-my $prefix=undef;
+my @git_dir_stack;
+my $prefix;
sub in_git_dir ($$) {
- $git_dir=shift;
+ unshift @git_dir_stack, shift;
my @ret=shift->();
- $git_dir=undef;
+ shift @git_dir_stack;
$prefix=undef;
return @ret;
}
-sub safe_git (&@) {
+# Loosely based on git-new-workdir from git contrib.
+sub create_temp_working_dir ($$) {
+ my $rootdir = shift;
+ my $branch = shift;
+ my $working = "$rootdir/.git/ikiwiki-temp-working";
+ remove_tree($working);
+
+ foreach my $dir ("", ".git") {
+ if (!mkdir("$working/$dir")) {
+ error("Unable to create $working/$dir: $!");
+ }
+ }
+
+ # Hooks are deliberately not included: we will commit to the temporary
+ # branch that is used in the temporary working tree, and we don't want
+ # to run the post-commit hook there.
+ #
+ # logs/refs is not included because we don't use the reflog.
+ # remotes, rr-cache, svn are similarly excluded.
+ foreach my $link ("config", "refs", "objects", "info", "packed-refs") {
+ if (!symlink("../../$link", "$working/.git/$link")) {
+ error("Unable to create symlink $working/.git/$link: $!");
+ }
+ }
+
+ open (my $out, '>', "$working/.git/HEAD") or
+ error("failed to write $working.git/HEAD: $!");
+ print $out "ref: refs/heads/$branch\n" or
+ error("failed to write $working.git/HEAD: $!");
+ close $out or
+ error("failed to write $working.git/HEAD: $!");
+ return $working;
+}
+
+sub safe_git {
# Start a child process safely without resorting to /bin/sh.
# Returns command output (in list content) or success state
# (in scalar context), or runs the specified data handler.
- my ($error_handler, $data_handler, @cmdline) = @_;
+ my %params = @_;
my $pid = open my $OUT, "-|";
if (!$pid) {
# In child.
# Git commands want to be in wc.
- if (! defined $git_dir) {
+ if (! @git_dir_stack) {
chdir $config{srcdir}
or error("cannot chdir to $config{srcdir}: $!");
}
else {
- chdir $git_dir
- or error("cannot chdir to $git_dir: $!");
+ chdir $git_dir_stack[0]
+ or error("cannot chdir to $git_dir_stack[0]: $!");
}
- exec @cmdline or error("Cannot exec '@cmdline': $!");
+
+ if ($params{stdout}) {
+ open(STDOUT, '>&', $params{stdout}) or error("Cannot reopen stdout: $!");
+ }
+
+ exec @{$params{cmdline}} or error("Cannot exec '@{$params{cmdline}}': $!");
}
# In parent.
chomp;
- if (! defined $data_handler) {
+ if (! defined $params{data_handler}) {
push @lines, $_;
}
else {
- last unless $data_handler->($_);
+ last unless $params{data_handler}->($_);
}
}
close $OUT;
- $error_handler->("'@cmdline' failed: $!") if $? && $error_handler;
+ $params{error_handler}->("'@{$params{cmdline}}' failed: $!") if $? && $params{error_handler};
return wantarray ? @lines : ($? == 0);
}
# Convenient wrappers.
-sub run_or_die ($@) { safe_git(\&error, undef, @_) }
-sub run_or_cry ($@) { safe_git(sub { warn @_ }, undef, @_) }
-sub run_or_non ($@) { safe_git(undef, undef, @_) }
+sub run_or_die ($@) { safe_git(error_handler => \&error, cmdline => \@_) }
+sub run_or_cry ($@) { safe_git(error_handler => sub { warn @_ }, cmdline => \@_) }
+sub run_or_non ($@) { safe_git(cmdline => \@_) }
sub ensure_committer {
if (! length $ENV{GIT_AUTHOR_NAME} || ! length $ENV{GIT_COMMITTER_NAME}) {
}
shift @{ $dt_ref } if $dt_ref->[0] =~ /^$/;
+ $ci{details} = [parse_changed_files($dt_ref)];
+
+ return \%ci;
+}
+
+sub parse_changed_files {
+ my $dt_ref = shift;
+
+ my @files;
+
# Modified files.
while (my $line = shift @{ $dt_ref }) {
if ($line =~ m{^
my $status = shift(@tmp);
if (length $file) {
- push @{ $ci{'details'} }, {
+ push @files, {
'file' => decode_git_file($file),
'sha1_from' => $sha1_from[0],
'sha1_to' => $sha1_to,
last;
}
- return \%ci;
+ return @files;
}
sub git_commit_info ($;$) {
elsif (defined $params{session}->remote_addr()) {
$u=$params{session}->remote_addr();
}
- if (defined $u) {
+ if (length $u) {
$u=encode_utf8($u);
$ENV{GIT_AUTHOR_NAME}=$u;
}
+ else {
+ $u = 'anonymous';
+ }
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) {
+ if (length $u) {
$ENV{GIT_AUTHOR_EMAIL}="$u\@web";
}
+ else {
+ $ENV{GIT_AUTHOR_EMAIL}='anonymous@web';
+ }
}
ensure_committer();
if (@lines || $line=~/^diff --git/);
return 1;
};
- safe_git(undef, $addlines, "git", "show", $sha1);
+ safe_git(
+ error_handler => undef,
+ data_handler => $addlines,
+ cmdline => ["git", "show", $sha1],
+ );
if (wantarray) {
return @lines;
}
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'.");
- }
+ safe_git(
+ error_handler => sub { error("failed writing temp file '$path': ".shift."."); },
+ stdout => $fh,
+ cmdline => ['git', 'show', $detail->{sha1_to}],
+ );
}
push @rets, {
my $rev=shift;
my ($sha1) = $rev =~ /^($sha1_pattern)$/; # untaint
+ my @undo; # undo stack for cleanup in case of an error
+
+ ensure_committer();
+
# Examine changes from root of git repo, not from any subdir,
# in order to see all changes.
my ($subdir, $rootdir) = git_find_root();
- in_git_dir($rootdir, sub {
+ return in_git_dir($rootdir, sub {
my @commits=git_commit_info($sha1, 1);
if (! @commits) {
error gettext("you are not allowed to revert a merge");
}
+ # Due to the presence of rename-detection, we cannot actually
+ # see what will happen in a revert without trying it.
+ # But we can guess, which is enough to rule out most changes
+ # that we won't allow reverting.
git_parse_changes(1, @commits);
+
+ my $failure;
+ my @ret;
+ eval {
+ IkiWiki::disable_commit_hook();
+ push @undo, sub {
+ IkiWiki::enable_commit_hook();
+ };
+ my $branch = "ikiwiki_revert_${sha1}"; # supposed to be unique
+
+ push @undo, sub {
+ run_or_cry('git', 'branch', '-D', $branch) if $failure;
+ };
+ if (run_or_non('git', 'rev-parse', '--quiet', '--verify', $branch)) {
+ run_or_non('git', 'branch', '-D', $branch);
+ }
+ run_or_die('git', 'branch', $branch, $config{gitmaster_branch});
+
+ my $working = create_temp_working_dir($rootdir, $branch);
+
+ push @undo, sub {
+ remove_tree($working);
+ };
+
+ in_git_dir($working, sub {
+ run_or_die('git', 'checkout', '--quiet', '--force', $branch);
+ run_or_die('git', 'revert', '--no-commit', $sha1);
+ run_or_die('git', 'commit', '-m', "revert $sha1", '-a');
+ });
+
+ my @raw_lines;
+ @raw_lines = run_or_die('git', 'diff', '--pretty=raw',
+ '--raw', '--abbrev=40', '--always', '--no-renames',
+ "..${branch}");
+
+ my $ci = {
+ details => [parse_changed_files(\@raw_lines)],
+ };
+
+ @ret = git_parse_changes(0, $ci);
+ };
+ $failure = $@;
+
+ # Process undo stack (in reverse order). By policy cleanup
+ # actions should normally print a warning on failure.
+ while (my $handle = pop @undo) {
+ $handle->();
+ }
+
+ if ($failure) {
+ my $message = sprintf(gettext("Failed to revert commit %s"), $sha1);
+ error("$message\n$failure\n");
+ }
+
+ return @ret;
});
}
ensure_committer();
- if (run_or_non('git', 'revert', '--no-commit', $sha1)) {
+ if (run_or_non('git', 'merge', '--ff-only', "ikiwiki_revert_$sha1")) {
return undef;
}
else {
- run_or_die('git', 'reset', '--hard');
+ run_or_non('git', 'branch', '-D', "ikiwiki_revert_$sha1");
return sprintf(gettext("Failed to revert commit %s"), $sha1);
}
}