diff options
| -rw-r--r-- | shell/hush.c | 15 | ||||
| -rw-r--r-- | shell/hush_test/hush-psubst/emptytick.right | 8 | ||||
| -rwxr-xr-x | shell/hush_test/hush-psubst/emptytick.tests | 4 |
3 files changed, 17 insertions, 10 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; } } diff --git a/shell/hush_test/hush-psubst/emptytick.right b/shell/hush_test/hush-psubst/emptytick.right index 1f60ecfda..2500caba5 100644 --- a/shell/hush_test/hush-psubst/emptytick.right +++ b/shell/hush_test/hush-psubst/emptytick.right @@ -1,17 +1,17 @@ 0 0 hush: can't execute '': No such file or directory -0 +127 hush: can't execute '': No such file or directory -0 +127 0 0 0 0 hush: can't execute '': No such file or directory -0 +127 hush: can't execute '': No such file or directory -0 +127 0 0 hush: can't execute '': No such file or directory diff --git a/shell/hush_test/hush-psubst/emptytick.tests b/shell/hush_test/hush-psubst/emptytick.tests index a269f025a..eaffafb22 100755 --- a/shell/hush_test/hush-psubst/emptytick.tests +++ b/shell/hush_test/hush-psubst/emptytick.tests @@ -1,17 +1,13 @@ true; ``; echo $? false; ``; echo $? -# UNFIXED BUG. bash sets $? to 127: true; `""`; echo $? -# bash sets $? to 127: false; `""`; echo $? true; ` `; echo $? false; ` `; echo $? true; $(); echo $? false; $(); echo $? -# bash sets $? to 127: true; $(""); echo $? -# bash sets $? to 127: false; $(""); echo $? true; $( ); echo $? false; $( ); echo $? |