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 $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 $git_dir=undef;
sub import {
hook(type => "checkconfig", id => "git", call => \&checkconfig);
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);
+ hook(type => "rcs", id => "rcs_find_changes", call => \&rcs_find_changes);
+ hook(type => "rcs", id => "rcs_get_current_rev", call => \&rcs_get_current_rev);
}
sub checkconfig () {
}
}
+my @git_dir_stack;
+my $prefix;
+
+sub in_git_dir ($$) {
+ unshift @git_dir_stack, shift;
+ my @ret=shift->();
+ shift @git_dir_stack;
+ $prefix=undef;
+ return @ret;
+}
+
+# Loosely based on git-new-workdir from git contrib.
+sub create_temp_working_dir ($$) {
+ 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 $working;
+}
+
sub safe_git (&@) {
# Start a child process safely without resorting to /bin/sh.
# Returns command output (in list content) or success state
if (!$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': $!");
}
sub run_or_cry ($@) { safe_git(sub { warn @_ }, undef, @_) }
sub run_or_non ($@) { safe_git(undef, undef, @_) }
+sub ensure_committer {
+ if (! length $ENV{GIT_AUTHOR_NAME} || ! length $ENV{GIT_COMMITTER_NAME}) {
+ my $name = join('', run_or_non("git", "config", "user.name"));
+ if (! length $name) {
+ run_or_die("git", "config", "user.name", "IkiWiki");
+ }
+ }
+
+ if (! length $ENV{GIT_AUTHOR_EMAIL} || ! length $ENV{GIT_COMMITTER_EMAIL}) {
+ my $email = join('', run_or_non("git", "config", "user.email"));
+ if (! length $email) {
+ run_or_die("git", "config", "user.email", "ikiwiki.info");
+ }
+ }
+}
sub merge_past ($$$) {
# Unlike with Subversion, Git cannot make a 'svn merge -rN:M file'.
my @undo; # undo stack for cleanup in case of an error
my $conflict; # file content with conflict markers
+ ensure_committer();
+
eval {
# Hide local changes from Git by renaming the modified file.
# Relative paths must be converted to absolute for renaming.
return $conflict;
}
-{
-my $prefix;
sub decode_git_file ($) {
my $file=shift;
return decode("utf8", $file);
}
-}
sub parse_diff_tree ($) {
# Parse the raw diff tree chunk and return the info hash.
my $dt_ref = shift;
# End of stream?
- return if !defined @{ $dt_ref } ||
- !defined @{ $dt_ref }[0] || !length @{ $dt_ref }[0];
+ return if ! @{ $dt_ref } ||
+ !defined $dt_ref->[0] || !length $dt_ref->[0];
my %ci;
# Header line.
}
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 ($;$) {
my @raw_lines = run_or_die('git', 'log', @opts,
'--pretty=raw', '--raw', '--abbrev=40', '--always', '-c',
- '-r', $sha1, '--', '.');
+ '-r', $sha1, '--no-renames', '--', '.');
my @ci;
while (my $parsed = parse_diff_tree(\@raw_lines)) {
return wantarray ? @ci : $ci[0];
}
-sub git_sha1 (;$) {
- # Return head sha1sum (of given file).
- my $file = shift || q{--};
+sub rcs_find_changes ($) {
+ my $oldrev=shift;
+
+ # Note that git log will sometimes show files being added that
+ # don't exist. Particularly, git merge -s ours can result in a
+ # merge commit where some files were not really added.
+ # This is why the code below verifies that the files really
+ # exist.
+ my @raw_lines = run_or_die('git', 'log',
+ '--pretty=raw', '--raw', '--abbrev=40', '--always', '-c',
+ '--no-renames', , '--reverse',
+ '-r', "$oldrev..HEAD", '--', '.');
+
+ # Due to --reverse, we see changes in chronological order.
+ my %changed;
+ my %deleted;
+ my $nullsha = 0 x 40;
+ my $newrev=$oldrev;
+ while (my $ci = parse_diff_tree(\@raw_lines)) {
+ $newrev=$ci->{sha1};
+ foreach my $i (@{$ci->{details}}) {
+ my $file=$i->{file};
+ if ($i->{sha1_to} eq $nullsha) {
+ if (! -e "$config{srcdir}/$file") {
+ delete $changed{$file};
+ $deleted{$file}=1;
+ }
+ }
+ else {
+ if (-e "$config{srcdir}/$file") {
+ delete $deleted{$file};
+ $changed{$file}=1;
+ }
+ }
+ }
+ }
+ return (\%changed, \%deleted, $newrev);
+}
+
+sub git_sha1_file ($) {
+ my $file=shift;
+ git_sha1("--", $file);
+}
+
+sub git_sha1 (@) {
# Ignore error since a non-existing file might be given.
my ($sha1) = run_or_non('git', 'rev-list', '--max-count=1', 'HEAD',
- '--', $file);
- if ($sha1) {
+ '--', @_);
+ if (defined $sha1) {
($sha1) = $sha1 =~ m/($sha1_pattern)/; # sha1 is untainted now
}
- else {
- debug("Empty sha1sum for '$file'.");
- }
- return defined $sha1 ? $sha1 : q{};
+ return defined $sha1 ? $sha1 : '';
+}
+
+sub rcs_get_current_rev () {
+ git_sha1();
}
sub rcs_update () {
# Update working directory.
+ ensure_committer();
+
if (length $config{gitorigin_branch}) {
run_or_cry('git', 'pull', '--prune', $config{gitorigin_branch});
}
# This will be later used in rcs_commit if a merge is required.
my ($file) = @_;
- return git_sha1($file);
+ return git_sha1_file($file);
}
sub rcs_commit (@) {
# Check to see if the page has been changed by someone else since
# rcs_prepedit was called.
- my $cur = git_sha1($params{file});
- my ($prev) = $params{token} =~ /^($sha1_pattern)$/; # untaint
+ my $cur = git_sha1_file($params{file});
+ my $prev;
+ if (defined $params{token}) {
+ ($prev) = $params{token} =~ /^($sha1_pattern)$/; # untaint
+ }
if (defined $cur && defined $prev && $cur ne $prev) {
my $conflict = merge_past($prev, $params{file}, $dummy_commit_msg);
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();
+
$params{message} = IkiWiki::possibly_foolish_untaint($params{message});
my @opts;
if ($params{message} !~ /\S/) {
# Force git to allow empty commit messages.
# (If this version of git supports it.)
my ($version)=`git --version` =~ /git version (.*)/;
- if ($version ge "1.5.4") {
+ if ($version ge "1.7.8") {
+ push @opts, "--allow-empty-message", "--no-edit";
+ }
+ if ($version ge "1.7.2") {
+ push @opts, "--allow-empty-message";
+ }
+ elsif ($version ge "1.5.4") {
push @opts, '--cleanup=verbatim';
}
else {
# 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});
+ run_or_cry('git', 'push', $config{gitorigin_branch}, $config{gitmaster_branch});
}
}
my ($file) = @_;
- run_or_cry('git', 'add', $file);
+ ensure_committer();
+
+ run_or_cry('git', 'add', '--', $file);
}
sub rcs_remove ($) {
my ($file) = @_;
- run_or_cry('git', 'rm', '-f', $file);
+ ensure_committer();
+
+ run_or_cry('git', 'rm', '-f', '--', $file);
}
sub rcs_rename ($$) {
my ($src, $dest) = @_;
- run_or_cry('git', 'mv', '-f', $src, $dest);
+ ensure_committer();
+
+ run_or_cry('git', 'mv', '-f', '--', $src, $dest);
}
sub rcs_recentchanges ($) {
my @pages;
foreach my $detail (@{ $ci->{'details'} }) {
my $file = $detail->{'file'};
+ my $efile = join('/',
+ map { uri_escape_utf8($_) } split('/', $file)
+ );
my $diffurl = defined $config{'diffurl'} ? $config{'diffurl'} : "";
- $diffurl =~ s/\[\[file\]\]/$file/go;
+ $diffurl =~ s/\[\[file\]\]/$efile/go;
$diffurl =~ s/\[\[sha1_parent\]\]/$ci->{'parent'}/go;
$diffurl =~ s/\[\[sha1_from\]\]/$detail->{'sha1_from'}/go;
$diffurl =~ s/\[\[sha1_to\]\]/$detail->{'sha1_to'}/go;
}
sub git_parse_changes {
+ my $reverted = shift;
my @changes = @_;
my ($subdir, $rootdir) = git_find_root();
$mode=$detail->{'mode_to'};
}
elsif ($detail->{'status'} =~ /^[AM]+\d*$/) {
- $action="add";
+ $action= $reverted ? "remove" : "add";
$mode=$detail->{'mode_to'};
}
elsif ($detail->{'status'} =~ /^[DAM]+\d*/) {
- $action="remove";
+ $action= $reverted ? "add" : "remove";
$mode=$detail->{'mode_from'};
}
else {
die $@ if $@;
my $fh;
($fh, $path)=File::Temp::tempfile(undef, UNLINK => 1);
- my $cmd = "cd $git_dir && ".
+ my $cmd = "cd $git_dir_stack[0] && ".
"git show $detail->{sha1_to} > '$path'";
if (system($cmd) != 0) {
error("failed writing temp file '$path'.");
# (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.
- $git_dir=".";
- push @rets, git_parse_changes(git_commit_info($oldrev."..".$newrev));
- $git_dir=undef;
+ in_git_dir(".", sub {
+ push @rets, git_parse_changes(0, git_commit_info($oldrev."..".$newrev));
+ });
}
return reverse @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();
- $git_dir=$rootdir;
+ return in_git_dir($rootdir, sub {
+ my @commits=git_commit_info($sha1, 1);
+
+ if (! @commits) {
+ error "unknown commit"; # just in case
+ }
- my @commits=git_commit_info($sha1, 1);
- if (! @commits) {
- error "unknown commit"; # just in case
- }
+ # 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");
+ }
- # 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");
- }
+ # 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
- my @ret=git_parse_changes(@commits);
+ 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});
- $git_dir=undef;
- return @ret;
+ 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$failure\n");
+ }
+
+ return @ret;
+ });
}
sub rcs_revert ($) {
my $rev = shift;
my ($sha1) = $rev =~ /^($sha1_pattern)$/; # untaint
- if (run_or_non('git', 'revert', '--no-commit', $sha1)) {
+ ensure_committer();
+
+ if (run_or_non('git', 'merge', '--ff-only', "ikiwiki_revert_$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);
}
}