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hush: fix exit code propagation from cmd. +45 bytes

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-11-16 02:00:03 +01:00
parent a7ccdeef39
commit 00243b0a1a
3 changed files with 17 additions and 10 deletions
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15
shell/hush.c
View File

@ -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;
}
}

8
shell/hush_test/hush-psubst/emptytick.right
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@ -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

4
shell/hush_test/hush-psubst/emptytick.tests
View File

@ -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 $?