discover/boot: Allow boot hooks to alter boot data

By exiting with status == 2, boot hooks can update boot data by
printing name=value to stdout.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/system/system.c b/lib/system/system.c
index 7bb4997..528e134 100644
--- a/lib/system/system.c
+++ b/lib/system/system.c
@@ -159,9 +159,9 @@ int pb_run_cmd_pipe(const char *const *cmd_argv, int wait, int dry_run,
 	int status, pipefd[2];
 	pid_t pid;
 
-	assert(!wait && stdout_buf);
-	assert(!!ctx != !!stdout_buf);
-	assert(!!stdout_buf != !!stdout_buf_len);
+	assert(!stdout_buf || wait);
+	assert(!stdout_buf || ctx);
+	assert(!stdout_buf || stdout_buf_len);
 
 	if (do_debug) {
 		const char *const *p = cmd_argv;