Use the asyncronous function infrastructure in builtin-fetch-pack.c.

We run the sideband demultiplexer in an asynchronous function.

Note that earlier there was a check in the child process that closed
xd[1] only if it was different from xd[0]; this test is no longer needed
because git_connect() always returns two different file descriptors
(see ec587fde0a76780931c7ac32474c8c000aa45134).

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

diff --git a/builtin-fetch-pack.c b/builtin-fetch-pack.c
index 871b7042e74837b5dfd26f17f4317d4341c01100..51d8a32791df1c5fe04e0e69fbfe91887e026536 100644 (file)
--- a/builtin-fetch-pack.c
+++ b/builtin-fetch-pack.c
@@ -457,42 +457,37 @@ static int everything_local(struct ref **refs, int nr_match, char **match)
        return retval;
 }
 
-static pid_t setup_sideband(int fd[2], int xd[2])
+static int sideband_demux(int fd, void *data)
 {
-       pid_t side_pid;
+       int *xd = data;
 
+       close(xd[1]);
+       return recv_sideband("fetch-pack", xd[0], fd, 2);
+}
+
+static void setup_sideband(int fd[2], int xd[2], struct async *demux)
+{
        if (!use_sideband) {
                fd[0] = xd[0];
                fd[1] = xd[1];
-               return 0;
+               return;
        }
        /* xd[] is talking with upload-pack; subprocess reads from
         * xd[0], spits out band#2 to stderr, and feeds us band#1
-        * through our fd[0].
+        * through demux->out.
         */
-       if (pipe(fd) < 0)
-               die("fetch-pack: unable to set up pipe");
-       side_pid = fork();
-       if (side_pid < 0)
+       demux->proc = sideband_demux;
+       demux->data = xd;
+       if (start_async(demux))
                die("fetch-pack: unable to fork off sideband demultiplexer");
-       if (!side_pid) {
-               /* subprocess */
-               close(fd[0]);
-               if (xd[0] != xd[1])
-                       close(xd[1]);
-               if (recv_sideband("fetch-pack", xd[0], fd[1], 2))
-                       exit(1);
-               exit(0);
-       }
        close(xd[0]);
-       close(fd[1]);
+       fd[0] = demux->out;
        fd[1] = xd[1];
-       return side_pid;
 }
 
 static int get_pack(int xd[2], char **pack_lockfile)
 {
-       pid_t side_pid;
+       struct async demux;
        int fd[2];
        const char *argv[20];
        char keep_arg[256];
@@ -501,7 +496,7 @@ static int get_pack(int xd[2], char **pack_lockfile)
        int do_keep = args.keep_pack;
        struct child_process cmd;
 
-       side_pid = setup_sideband(fd, xd);
+       setup_sideband(fd, xd, &demux);
 
        memset(&cmd, 0, sizeof(cmd));
        cmd.argv = argv;
@@ -556,6 +551,8 @@ static int get_pack(int xd[2], char **pack_lockfile)
 
        if (finish_command(&cmd))
                die("%s failed", argv[0]);
+       if (use_sideband && finish_async(&demux))
+               die("error in sideband demultiplexer");
        return 0;
 }