Merge branch 'sb/run-command-fd-error-reporting'

* sb/run-command-fd-error-reporting:
  run-command: be more informative about what failed

run-command.c

@@ -274,6 +274,7 @@ int start_command(struct child_process *cmd)
 	int need_in, need_out, need_err;
 	int fdin[2], fdout[2], fderr[2];
 	int failed_errno = failed_errno;
+	char *str;
 
 	/*
 	 * In case of errors we must keep the promise to close FDs
@@ -286,6 +287,7 @@ int start_command(struct child_process *cmd)
 			failed_errno = errno;
 			if (cmd->out > 0)
 				close(cmd->out);
+			str = "standard input";
 			goto fail_pipe;
 		}
 		cmd->in = fdin[1];
@@ -301,6 +303,7 @@ int start_command(struct child_process *cmd)
 				close_pair(fdin);
 			else if (cmd->in)
 				close(cmd->in);
+			str = "standard output";
 			goto fail_pipe;
 		}
 		cmd->out = fdout[0];
@@ -318,9 +321,10 @@ int start_command(struct child_process *cmd)
 				close_pair(fdout);
 			else if (cmd->out)
 				close(cmd->out);
+			str = "standard error";
 fail_pipe:
-			error("cannot create pipe for %s: %s",
-				cmd->argv[0], strerror(failed_errno));
+			error("cannot create %s pipe for %s: %s",
+				str, cmd->argv[0], strerror(failed_errno));
 			errno = failed_errno;
 			return -1;
 		}