X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/e7bf599ee027b0f35618fe6bc504d8137d404520..e566e9b20ef914e128dd783cd1a5f807f701636c:/IkiWiki/Plugin/git.pm?ds=sidebyside

diff --git a/IkiWiki/Plugin/git.pm b/IkiWiki/Plugin/git.pm
index 0c0e27521..021ee726c 100644
--- a/IkiWiki/Plugin/git.pm
+++ b/IkiWiki/Plugin/git.pm
@@ -29,6 +29,8 @@ sub import {
 	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 () {
@@ -218,6 +220,21 @@ 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 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 ($$$) {
 	# Unlike with Subversion, Git cannot make a 'svn merge -rN:M file'.
@@ -256,6 +273,8 @@ sub merge_past ($$$) {
 	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.
@@ -341,8 +360,8 @@ sub parse_diff_tree ($) {
 	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.
@@ -406,6 +425,16 @@ sub parse_diff_tree ($) {
 	}
 	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{^
@@ -423,7 +452,7 @@ sub parse_diff_tree ($) {
 			my $status = shift(@tmp);
 
 			if (length $file) {
-				push @{ $ci{'details'} }, {
+				push @files, {
 					'file'      => decode_git_file($file),
 					'sha1_from' => $sha1_from[0],
 					'sha1_to'   => $sha1_to,
@@ -437,7 +466,7 @@ sub parse_diff_tree ($) {
 		last;
 	}
 
-	return \%ci;
+	return @files;
 }
 
 sub git_commit_info ($;$) {
@@ -450,7 +479,7 @@ 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 $parsed = parse_diff_tree(\@raw_lines)) {
@@ -462,22 +491,70 @@ sub git_commit_info ($;$) {
 	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 (defined $sha1) {
 		($sha1) = $sha1 =~ m/($sha1_pattern)/; # sha1 is untainted now
 	}
 	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', $config{gitorigin_branch});
 	}
@@ -488,7 +565,7 @@ sub rcs_prepedit ($) {
 	# 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 (@) {
@@ -499,8 +576,11 @@ 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);
@@ -530,27 +610,41 @@ sub rcs_commit_helper (@) {
 		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 {
@@ -564,7 +658,7 @@ sub rcs_commit_helper (@) {
 	# 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});
 		}
 	}
 	
@@ -577,7 +671,9 @@ sub rcs_add ($) {
 
 	my ($file) = @_;
 
-	run_or_cry('git', 'add', $file);
+	ensure_committer();
+
+	run_or_cry('git', 'add', '--', $file);
 }
 
 sub rcs_remove ($) {
@@ -585,13 +681,17 @@ sub rcs_remove ($) {
 
 	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 ($) {
@@ -615,7 +715,9 @@ sub rcs_recentchanges ($) {
 		my @pages;
 		foreach my $detail (@{ $ci->{'details'} }) {
 			my $file = $detail->{'file'};
-			my $efile = uri_escape_utf8($file);
+			my $efile = join('/',
+				map { uri_escape_utf8($_) } split('/', $file)
+			);
 
 			my $diffurl = defined $config{'diffurl'} ? $config{'diffurl'} : "";
 			$diffurl =~ s/\[\[file\]\]/$efile/go;
@@ -863,10 +965,14 @@ sub rcs_preprevert ($) {
 	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) {
@@ -879,7 +985,68 @@ sub rcs_preprevert ($) {
 			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;
+		# If it looks OK, do it for real, on a branch.
+		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});
+
+			push @undo, sub {
+				if (!run_or_cry('git', 'checkout', '--quiet', $config{gitmaster_branch})) {
+					run_or_cry('git', 'checkout','-f', '--quiet', $config{gitmaster_branch});
+				}
+			};
+			run_or_die('git', 'checkout', '--quiet', $branch);
+
+			run_or_die('git', 'revert', '--no-commit', $sha1);
+			run_or_non('git', 'commit', '-m', "revert $sha1", '-a');
+
+			# Re-switch to master.
+			run_or_die('git', 'checkout', '--quiet', $config{gitmaster_branch});
+
+			my @raw_lines;
+			@raw_lines = run_or_die('git', 'diff', '--pretty=raw',
+				'--raw', '--abbrev=40', '--always', '--no-renames',
+				"ikiwiki_revert_${sha1}..");
+
+			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;
 	});
 }
 
@@ -888,11 +1055,13 @@ 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);
 	}
 }