git remote update: Fallback to remote if group does not exist

diff --git a/run-command.c b/run-command.c
index c90cdc50e3165bcdb798c85b2dc7b929a9b0a144..b05c734d05e99cd009a0df26f0fc95fa13ae6f25 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -118,7 +118,9 @@ int start_command(struct child_process *cmd)
                } else {
                        execvp(cmd->argv[0], (char *const*) cmd->argv);
                }
-               die("exec %s failed.", cmd->argv[0]);
+               trace_printf("trace: exec '%s' failed: %s\n", cmd->argv[0],
+                               strerror(errno));
+               exit(127);
        }
 #else
        int s0 = -1, s1 = -1, s2 = -1;  /* backups of stdin, stdout, stderr */
@@ -187,6 +189,7 @@ int start_command(struct child_process *cmd)
 #endif
 
        if (cmd->pid < 0) {
+               int err = errno;
                if (need_in)
                        close_pair(fdin);
                else if (cmd->in)
@@ -197,7 +200,9 @@ int start_command(struct child_process *cmd)
                        close(cmd->out);
                if (need_err)
                        close_pair(fderr);
-               return -ERR_RUN_COMMAND_FORK;
+               return err == ENOENT ?
+                       -ERR_RUN_COMMAND_EXEC :
+                       -ERR_RUN_COMMAND_FORK;
        }
 
        if (need_in)
@@ -236,9 +241,14 @@ static int wait_or_whine(pid_t pid)
                if (!WIFEXITED(status))
                        return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
                code = WEXITSTATUS(status);
-               if (code)
+               switch (code) {
+               case 127:
+                       return -ERR_RUN_COMMAND_EXEC;
+               case 0:
+                       return 0;
+               default:
                        return -code;
-               return 0;
+               }
        }
 }
 
@@ -342,3 +352,48 @@ int finish_async(struct async *async)
 #endif
        return ret;
 }
+
+int run_hook(const char *index_file, const char *name, ...)
+{
+       struct child_process hook;
+       const char **argv = NULL, *env[2];
+       char index[PATH_MAX];
+       va_list args;
+       int ret;
+       size_t i = 0, alloc = 0;
+
+       if (access(git_path("hooks/%s", name), X_OK) < 0)
+               return 0;
+
+       va_start(args, name);
+       ALLOC_GROW(argv, i + 1, alloc);
+       argv[i++] = git_path("hooks/%s", name);
+       while (argv[i-1]) {
+               ALLOC_GROW(argv, i + 1, alloc);
+               argv[i++] = va_arg(args, const char *);
+       }
+       va_end(args);
+
+       memset(&hook, 0, sizeof(hook));
+       hook.argv = argv;
+       hook.no_stdin = 1;
+       hook.stdout_to_stderr = 1;
+       if (index_file) {
+               snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
+               env[0] = index;
+               env[1] = NULL;
+               hook.env = env;
+       }
+
+       ret = start_command(&hook);
+       free(argv);
+       if (ret) {
+               warning("Could not spawn %s", argv[0]);
+               return ret;
+       }
+       ret = finish_command(&hook);
+       if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL)
+               warning("%s exited due to uncaught signal", argv[0]);
+
+       return ret;
+}