Use start_comand() in builtin-fetch-pack.c instead of explicit fork/exec.

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

builtin-fetch-pack.c

@@ -7,6 +7,7 @@
 #include "pack.h"
 #include "sideband.h"
 #include "fetch-pack.h"
+#include "run-command.h"
 
 static int transfer_unpack_limit = -1;
 static int fetch_unpack_limit = -1;
@@ -491,18 +492,19 @@ static pid_t setup_sideband(int fd[2], int xd[2])
 
 static int get_pack(int xd[2], char **pack_lockfile)
 {
-	int status;
-	pid_t pid, side_pid;
+	pid_t side_pid;
 	int fd[2];
 	const char *argv[20];
 	char keep_arg[256];
 	char hdr_arg[256];
 	const char **av;
 	int do_keep = args.keep_pack;
-	int keep_pipe[2];
+	struct child_process cmd;
 
 	side_pid = setup_sideband(fd, xd);
 
+	memset(&cmd, 0, sizeof(cmd));
+	cmd.argv = argv;
 	av = argv;
 	*hdr_arg = 0;
 	if (!args.keep_pack && unpack_limit) {
@@ -519,8 +521,8 @@ static int get_pack(int xd[2], char **pack_lockfile)
 	}
 
 	if (do_keep) {
-		if (pack_lockfile && pipe(keep_pipe))
-			die("fetch-pack: pipe setup failure: %s", strerror(errno));
+		if (pack_lockfile)
+			cmd.out = -1;
 		*av++ = "index-pack";
 		*av++ = "--stdin";
 		if (!args.quiet && !args.no_progress)
@@ -544,43 +546,17 @@ static int get_pack(int xd[2], char **pack_lockfile)
 		*av++ = hdr_arg;
 	*av++ = NULL;
 
-	pid = fork();
-	if (pid < 0)
+	cmd.in = fd[0];
+	cmd.git_cmd = 1;
+	if (start_command(&cmd))
 		die("fetch-pack: unable to fork off %s", argv[0]);
-	if (!pid) {
-		dup2(fd[0], 0);
-		if (do_keep && pack_lockfile) {
-			dup2(keep_pipe[1], 1);
-			close(keep_pipe[0]);
-			close(keep_pipe[1]);
-		}
-		close(fd[0]);
-		close(fd[1]);
-		execv_git_cmd(argv);
-		die("%s exec failed", argv[0]);
-	}
-	close(fd[0]);
 	close(fd[1]);
-	if (do_keep && pack_lockfile) {
-		close(keep_pipe[1]);
-		*pack_lockfile = index_pack_lockfile(keep_pipe[0]);
-		close(keep_pipe[0]);
-	}
-	while (waitpid(pid, &status, 0) < 0) {
-		if (errno != EINTR)
-			die("waiting for %s: %s", argv[0], strerror(errno));
-	}
-	if (WIFEXITED(status)) {
-		int code = WEXITSTATUS(status);
-		if (code)
-			die("%s died with error code %d", argv[0], code);
-		return 0;
-	}
-	if (WIFSIGNALED(status)) {
-		int sig = WTERMSIG(status);
-		die("%s died of signal %d", argv[0], sig);
-	}
-	die("%s died of unnatural causes %d", argv[0], status);
+	if (do_keep && pack_lockfile)
+		*pack_lockfile = index_pack_lockfile(cmd.out);
+
+	if (finish_command(&cmd))
+		die("%s failed", argv[0]);
+	return 0;
 }
 
 static struct ref *do_fetch_pack(int fd[2],