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-rw-r--r--shell/hush.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/shell/hush.c b/shell/hush.c
index ede8d68..6dd6a0d 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;
}
}