[CRIU] [PATCH 2/2] zdtm:mnt_ext_dev: output a message if ZDTM_MNT_EXT_DEV is not set

[Dmitrii Shcherbakov]

Should be easier to debug if the variable is not passed by accident.

Signed-off-by: Dmitrii Shcherbakov <dshcherbakov at virtuozzo.com>
---
 test/zdtm/static/mnt_ext_dev.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/zdtm/static/mnt_ext_dev.c b/test/zdtm/static/mnt_ext_dev.c
index 7c3bd56..a9ac013 100644
--- a/test/zdtm/static/mnt_ext_dev.c
+++ b/test/zdtm/static/mnt_ext_dev.c
@@ -29,8 +29,10 @@ int main(int argc, char **argv)
 
 	mkdir(dirname, 0777);
 	loop = getenv("ZDTM_MNT_EXT_DEV");
-	if (loop == NULL)
+	if (loop == NULL) {
+		pr_perror("ZDTM_MNT_EXT_DEV is not set");
 		return 1;
+	}
 
 	if (mount(loop, dirname, "ext4", 0, NULL) == -1) {
 		pr_perror("mount");
-- 
2.7.4