diff options
Diffstat (limited to 'shell/hush.c')
| -rw-r--r-- | shell/hush.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/shell/hush.c b/shell/hush.c index ede8d680e..6dd6a0d03 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -3904,7 +3904,7 @@ static NOINLINE int run_pipe(struct pipe *pi) /* if someone gives us an empty string: `cmd with empty output` */ if (!argv_expanded[0]) { debug_leave(); - return 0; // or G.last_exitcode? see emptytick.tests + return G.last_exitcode; } x = find_builtin(argv_expanded[0]); @@ -6380,15 +6380,26 @@ static struct pipe *parse_stream(char **pstring, */ static void parse_and_run_stream(struct in_str *inp, int end_trigger) { + /* Why we need empty flag? + * An obscure corner case "false; ``; echo $?": + * empty command in `` should still set $? to 0. + * But we can't just set $? to 0 at the start, + * this breaks "false; echo `echo $?`" case. + */ + bool empty = 1; while (1) { struct pipe *pipe_list; pipe_list = parse_stream(NULL, inp, end_trigger); - if (!pipe_list) /* EOF */ + if (!pipe_list) { /* EOF */ + if (empty) + G.last_exitcode = 0; break; + } debug_print_tree(pipe_list, 0); debug_printf_exec("parse_and_run_stream: run_and_free_list\n"); run_and_free_list(pipe_list); + empty = 0; } } |