[PATCH/RFC 07/11] run-command: support input-fd

This patch adds the possibility to supply a non-0
file descriptor for communucation, instead of the
default-created pipe. The pipe gets duplicated, so
the caller can free it's handles.

This is usefull for async communication over sockets.

Signed-off-by: Erik Faye-Lund <redacted>
---
 run-command.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/run-command.c b/run-command.c
index e5a0e06..98771ef 100644
--- a/run-command.c
+++ b/run-command.c

@@ -327,7 +327,10 @@ int start_async(struct async *async)
 {
 	int pipe_out[2];
 
-	if (pipe(pipe_out) < 0)
+	if (async->out) {
+		pipe_out[0] = dup(async->out);
+		pipe_out[1] = dup(async->out);
+	} else if (pipe(pipe_out) < 0)
 		return error("cannot create pipe: %s", strerror(errno));
 	async->out = pipe_out[0];
 

-- 
1.6.5.rc2.7.g4f8d3