* Many changes to make ikiwiki very resistant to write failures

  including out of disk space situations. ikiwiki should never leave
  truncated files, and if the error occurs during a web-based file edit,
  the user will be given an opportunity to retry.
  Inspired by the many ways Moin Moin destroys itself when out of disk. :-)
* Fix syslogging of errors.

1 files changed, 9 insertions, 2 deletions

diff --git a/IkiWiki/UserInfo.pm b/IkiWiki/UserInfo.pm
index 115a263ce..02c27991c 100644
--- a/IkiWiki/UserInfo.pm
+++ b/IkiWiki/UserInfo.pm
@@ -15,12 +15,19 @@ sub userinfo_retrieve () { #{{{
 sub userinfo_store ($) { #{{{
 	my $userinfo=shift;
 	
+	my $newfile="$config{wikistatedir}/userdb.new";
 	my $oldmask=umask(077);
-	my $ret=Storable::lock_store($userinfo, "$config{wikistatedir}/userdb");
+	my $ret=Storable::lock_store($userinfo, $newfile);
 	umask($oldmask);
+	if (defined $ret && $ret) {
+		if (! rename($newfile, "$config{wikistatedir}/userdb")) {
+			unlink($newfile);
+			$ret=undef;
+		}
+	}
 	return $ret;
 } #}}}
-	
+
 sub userinfo_get ($$) { #{{{
 	my $user=shift;
 	my $field=shift;