From 0eabe6f79498e3339205aeff2c79ae1e85498ab4 Mon Sep 17 00:00:00 2001
From: Joey Hess <joey@kitenet.net>
Date: Thu, 1 Jul 2010 16:20:03 -0400
Subject: [PATCH] git: Added git_wrapper_background_command option. Can be used
 to eg,  make the git wrapper push to github in the background after ikiwiki
 runs.

---
 IkiWiki.pm            |  7 ++++++
 IkiWiki/Plugin/git.pm |  8 +++++++
 IkiWiki/Wrapper.pm    | 52 +++++++++++++++++++++++++++++++++++++------
 debian/changelog      |  3 +++
 4 files changed, 63 insertions(+), 7 deletions(-)

diff --git a/IkiWiki.pm b/IkiWiki.pm
index 35b38df46..701f7137d 100644
--- a/IkiWiki.pm
+++ b/IkiWiki.pm
@@ -441,6 +441,13 @@ sub getsetup () {
 		safe => 0,
 		rebuild => 0,
 	},
+	wrapper_background_command => {
+		type => "internal",
+		default => '',
+		description => "background shell command to run",
+		safe => 0,
+		rebuild => 0,
+	},
 	gettime => {
 		type => "internal",
 		description => "running in gettime mode",
diff --git a/IkiWiki/Plugin/git.pm b/IkiWiki/Plugin/git.pm
index 992c6226b..0f92476c9 100644
--- a/IkiWiki/Plugin/git.pm
+++ b/IkiWiki/Plugin/git.pm
@@ -41,6 +41,7 @@ sub checkconfig () {
 		push @{$config{wrappers}}, {
 			wrapper => $config{git_wrapper},
 			wrappermode => (defined $config{git_wrappermode} ? $config{git_wrappermode} : "06755"),
+			wrapper_background_command => $config{git_wrapper_background_command},
 		};
 	}
 
@@ -78,6 +79,13 @@ sub getsetup () {
 			safe => 0, # file
 			rebuild => 0,
 		},
+		git_wrapper_background_command => {
+			type => "string",
+			example => "git push github",
+			description => "shell command for git_wrapper to run, in the background",
+			safe => 0, # command
+			rebuild => 0,
+		},
 		git_wrappermode => {
 			type => "string",
 			example => '06755',
diff --git a/IkiWiki/Wrapper.pm b/IkiWiki/Wrapper.pm
index 73f0896e8..bd134c9a3 100644
--- a/IkiWiki/Wrapper.pm
+++ b/IkiWiki/Wrapper.pm
@@ -73,17 +73,23 @@ EOF
 		# otherwise. The fd of the lock is stored in
 		# IKIWIKI_CGILOCK_FD so unlockwiki can close it.
 		$pre_exec=<<"EOF";
-	{
-		int fd=open("$config{wikistatedir}/cgilock", O_CREAT | O_RDWR, 0666);
-		if (fd != -1 && flock(fd, LOCK_EX) == 0) {
-			char *fd_s=malloc(8);
-			sprintf(fd_s, "%i", fd);
-			setenv("IKIWIKI_CGILOCK_FD", fd_s, 1);
-		}
+	lockfd=open("$config{wikistatedir}/cgilock", O_CREAT | O_RDWR, 0666);
+	if (lockfd != -1 && flock(lockfd, LOCK_EX) == 0) {
+		char *fd_s=malloc(8);
+		sprintf(fd_s, "%i", lockfd);
+		setenv("IKIWIKI_CGILOCK_FD", fd_s, 1);
 	}
 EOF
 	}
 
+	my $set_background_command='';
+	if (defined $config{wrapper_background_command} &&
+	    length $config{wrapper_background_command}) {
+	    	my $background_command=delete $config{wrapper_background_command};
+		$set_background_command=~s/"/\\"/g;
+		$set_background_command='#define BACKGROUND_COMMAND "'.$background_command.'"';
+	}
+
 	$Data::Dumper::Indent=0; # no newlines
 	my $configstring=Data::Dumper->Dump([\%config], ['*config']);
 	$configstring=~s/\\/\\\\/g;
@@ -114,6 +120,7 @@ void addenv(char *var, char *val) {
 }
 
 int main (int argc, char **argv) {
+	int lockfd=-1;
 	char *s;
 
 $check_commit_hook
@@ -147,9 +154,40 @@ $envsave
 	}
 
 $pre_exec
+
+$set_background_command
+#ifdef BACKGROUND_COMMAND
+	if (lockfd != -1) {
+		close(lockfd);
+	}
+
+	pid_t pid=fork();
+	if (pid == -1) {
+		perror("fork");
+		exit(1);
+	}
+	else if (pid == 0) {
+		execl("$this", "$this", NULL);
+		perror("exec $this");
+		exit(1);		
+	}
+	else {
+		waitpid(pid, NULL, 0);
+
+		if (daemon(1, 0) == 0) {
+			system(BACKGROUND_COMMAND);
+			exit(0);
+		}
+		else {
+			perror("daemon");
+			exit(1);
+		}
+	}
+#else
 	execl("$this", "$this", NULL);
 	perror("exec $this");
 	exit(1);
+#endif
 }
 EOF
 
diff --git a/debian/changelog b/debian/changelog
index 4ce720ab6..7d857d9c0 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -17,6 +17,9 @@ ikiwiki (3.20100624) UNRELEASED; urgency=low
   * Use comment template on comments page of example blog.
   * comment.tmpl: Fix up display when inline uses it to display a non-comment
     page. (Such as a discussion page.)
+  * git: Added git_wrapper_background_command option. Can be used to eg, 
+    make the git wrapper push to github in the background after ikiwiki
+    runs.
 
  -- Joey Hess <joeyh@debian.org>  Wed, 23 Jun 2010 15:30:04 -0400
 
-- 
2.26.2