Merge branch 'js/forkexec'

* js/forkexec:
  Use the asyncronous function infrastructure to run the content filter.
  Avoid a dup2(2) in apply_filter() - start_command() can do it for us.
  t0021-conversion.sh: Test that the clean filter really cleans content.
  upload-pack: Run rev-list in an asynchronous function.
  upload-pack: Move the revision walker into a separate function.
  Use the asyncronous function infrastructure in builtin-fetch-pack.c.
  Add infrastructure to run a function asynchronously.
  upload-pack: Use start_command() to run pack-objects in create_pack_file().
  Have start_command() create a pipe to read the stderr of the child.
  Use start_comand() in builtin-fetch-pack.c instead of explicit fork/exec.
  Use run_command() to spawn external diff programs instead of fork/exec.
  Use start_command() to run content filters instead of explicit fork/exec.
  Use start_command() in git_connect() instead of explicit fork/exec.
  Change git_connect() to return a struct child_process instead of a pid_t.

Conflicts:

	builtin-fetch-pack.c

send-pack.c

@@ -384,7 +384,7 @@ int main(int argc, char **argv)
 	char *dest = NULL;
 	char **heads = NULL;
 	int fd[2], ret;
-	pid_t pid;
+	struct child_process *conn;
 	char *remote_name = NULL;
 	struct remote *remote = NULL;
 
@@ -452,12 +452,10 @@ int main(int argc, char **argv)
 		}
 	}
 
-	pid = git_connect(fd, dest, receivepack, verbose ? CONNECT_VERBOSE : 0);
-	if (pid < 0)
-		return 1;
+	conn = git_connect(fd, dest, receivepack, verbose ? CONNECT_VERBOSE : 0);
 	ret = send_pack(fd[0], fd[1], remote, nr_heads, heads);
 	close(fd[0]);
 	close(fd[1]);
-	ret |= finish_connect(pid);
+	ret |= finish_connect(conn);
 	return !!ret;
 }