From 4f872b563300e4a277cac3d7ea2a999bcf75d1ff Mon Sep 17 00:00:00 2001
From: Joey Hess <joey@kodama.kitenet.net>
Date: Thu, 24 Jan 2008 17:22:39 -0500
Subject: [PATCH] * aggregate: Fork a child process to handle the aggregation.
 This simplifies   the code, since that process can change internal state as
 needed, and   it will automatically be cleaned up for the parent process,
 which proceeds   to render the changes.

---
 IkiWiki/Plugin/aggregate.pm | 33 +++++++++++++++++++--------------
 debian/changelog            |  4 ++++
 2 files changed, 23 insertions(+), 14 deletions(-)

diff --git a/IkiWiki/Plugin/aggregate.pm b/IkiWiki/Plugin/aggregate.pm
index 0da527f25..09ea59029 100644
--- a/IkiWiki/Plugin/aggregate.pm
+++ b/IkiWiki/Plugin/aggregate.pm
@@ -37,14 +37,25 @@ sub checkconfig () { #{{{
 			debug("wiki is locked by another process, not aggregating");
 			exit 1;
 		}
-	
-		loadstate();
-		IkiWiki::loadindex();
-		aggregate();
-		expire();
-		savestate();
-		clearstate();
-
+		
+		# 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();
 	}
 } #}}}
@@ -211,12 +222,6 @@ sub savestate () { #{{{
 		error("rename $newfile: $!", $cleanup);
 } #}}}
 
-sub clearstate () { #{{{
-	%feeds=();
-	%guids=();
-	$state_loaded=0;
-} #}}}
-
 sub expire () { #{{{
 	foreach my $feed (values %feeds) {
 		next unless $feed->{expireage} || $feed->{expirecount};
diff --git a/debian/changelog b/debian/changelog
index f5e0b242e..d2fed8767 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -5,6 +5,10 @@ ikiwiki (2.21) UNRELEASED; urgency=low
     those older versions too.
   * aggregate: Don't let feeds set creation times for pages in the future.
   * Add full parser for git diff-tree output (Brian Downing)
+  * aggregate: Fork a child process to handle the aggregation. This simplifies
+    the code, since that process can change internal state as needed, and 
+    it will automatically be cleaned up for the parent process, which proceeds
+    to render the changes.
 
  -- Joey Hess <joeyh@debian.org>  Fri, 11 Jan 2008 15:09:37 -0500
 
-- 
2.39.5