[git commit] hush: do not print killing signal name in `cmd_whihc_dies_on_signal`

[Denys Vlasenko]

commit: https://git.busybox.net/busybox/commit/?id=b65d6cb00fa0ea51bac4c4e62b576b43ae2c996b
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

function                                             old     new   delta
process_wait_result                                  438     449     +11

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 shell/hush.c                            | 8 +++++++-
 shell/hush_test/hush-psubst/tick6.right | 1 +
 shell/hush_test/hush-psubst/tick6.tests | 1 +
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/shell/hush.c b/shell/hush.c
index e9cec1cc9..2b34b7da5 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -8698,9 +8698,15 @@ static int process_wait_result(struct pipe *fg_pipe, pid_t childpid, int status)
 				 */
 				if (WIFSIGNALED(status)) {
 					int sig = WTERMSIG(status);
-					if (i == fg_pipe->num_cmds-1)
+					if (G.run_list_level == 1
+					/* ^^^^^ Do not print in nested contexts, example:
+					 * echo `sleep 1; sh -c 'kill -9 $$'` - prints "137", NOT "Killed 137"
+					 */
+					 && i == fg_pipe->num_cmds-1
+					) {
 						/* TODO: use strsignal() instead for bash compat? but that's bloat... */
 						puts(sig == SIGINT || sig == SIGPIPE ? "" : get_signame(sig));
+					}
 					/* TODO: if (WCOREDUMP(status)) + " (core dumped)"; */
 					/* TODO: MIPS has 128 sigs (1..128), what if sig==128 here?
 					 * Maybe we need to use sig | 128? */
diff --git a/shell/hush_test/hush-psubst/tick6.right b/shell/hush_test/hush-psubst/tick6.right
new file mode 100644
index 000000000..065fd3e79
--- /dev/null
+++ b/shell/hush_test/hush-psubst/tick6.right
@@ -0,0 +1 @@
+137
diff --git a/shell/hush_test/hush-psubst/tick6.tests b/shell/hush_test/hush-psubst/tick6.tests
new file mode 100755
index 000000000..33dd3630d
--- /dev/null
+++ b/shell/hush_test/hush-psubst/tick6.tests
@@ -0,0 +1 @@
+true; echo `sh -c 'kill -9 $$'` $?