+}
+
+sub rcs_receive () {
+ # 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.
+ my $subdir="";
+ my $dir=$config{srcdir};
+ while (! -d "$dir/.git") {
+ $subdir=IkiWiki::basename($dir)."/".$subdir;
+ $dir=IkiWiki::dirname($dir);
+ if (! length $dir) {
+ error("cannot determine root of git repo");
+ }
+ }
+
+ my @rets;
+ while (<>) {
+ chomp;
+ my ($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.
+ # The pre-recieve 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"), $file);
+ }
+
+ my ($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'};
+ }
+ 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 $detail->{'mode_to'}) {
+ error gettext("you are not allowed to change file modes");
+ }
+ }
+
+ # extract attachment to temp file
+ if (($action eq 'add' || $action eq 'change') &&
+ ! pagetype($file)) {
+ eval q{use File::Temp};
+ die $@ if $@;
+ my $fh;
+ ($fh, $path)=File::Temp::tempfile("XXXXXXXXXX", UNLINK => 1);
+ if (system("git show ".$detail->{sha1_to}." > '$path'") != 0) {
+ error("failed writing temp file");
+ }
+ }
+
+ push @rets, {
+ file => $file,
+ action => $action,
+ path => $path,
+ };
+ }
+ }
+ }
+
+ return reverse @rets;
+}