- my $nolock=($config{post_commit} && ! IkiWiki::commit_hook_enabled());
- IkiWiki::lockwiki() unless $nolock;
- loadstate();
- if ($config{aggregate} && ! $nolock) {
- IkiWiki::loadindex();
- aggregate();
- expire();
- savestate();
+ if ($config{aggregate} && ! ($config{post_commit} &&
+ IkiWiki::commit_hook_enabled())) {
+ if (! IkiWiki::lockwiki(0)) {
+ debug("wiki is locked by another process, not aggregating");
+ exit 1;
+ }
+
+ # Fork a child process to handle the aggregation.
+ # The parent process will then handle building the result.
+ # This avoids messy code to clear state accumulated while
+ # aggregating.
+ defined(my $pid = fork) or error("Can't fork: $!");
+ if (! $pid) {
+ loadstate();
+ IkiWiki::loadindex();
+ aggregate();
+ expire();
+ savestate();
+ exit 0;
+ }
+ waitpid($pid,0);
+ if ($?) {
+ error "aggregation failed with code $?";
+ }
+
+ IkiWiki::unlockwiki();