fix checking hook script exit code

pclose returns the exit status from wait, we need to check that to see if the script itself failed or not. Tested a script that returned 0, 1, and also one that did a sleep and then was killed by a signal. Signed-off-by: Dwight Engen <dwight.engen@oracle.com> Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>

fix checking hook script exit code
8e7da691 · Dwight Engen · Stéphane Graber · 2796cf79 · 8e7da691
Commit 8e7da691 authored Apr 15, 2013 by Dwight Engen Committed by Stéphane Graber Apr 16, 2013
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conf.c src/lxc/conf.c +10 -1

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--- a/src/lxc/conf.c
+++ b/src/lxc/conf.c
@@ -299,6 +299,7 @@ static int run_buffer(char *buffer)
 {
 	FILE *f;
 	char *output;
+	int ret;
 	f = popen(buffer, "r");
 	if (!f) {
@@ -318,9 +319,17 @@ static int run_buffer(char *buffer)
 	free(output);
-	if (pclose(f) == -1) {
+	ret = pclose(f);
+	if (ret == -1) {
 		SYSERROR("Script exited on error");
 		return -1;
+	} else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) {
+		ERROR("Script exited with status %d", WEXITSTATUS(ret));
+		return -1;
+	} else if (WIFSIGNALED(ret)) {
+		ERROR("Script terminated by signal %d (%s)", WTERMSIG(ret),
+		      strsignal(WTERMSIG(ret)));
+		return -1;
 	}
 	return 0;