merge-recursive: don't segfault while handling rename clashes

diff --git a/run-command.c b/run-command.c
index c90cdc50e3165bcdb798c85b2dc7b929a9b0a144..44fccc9d5ef4d01eb3c73d6ce8cfbb0cfff0362b 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;
+               }
        }
 }