[PATCH 2/2] nilfs-tune: catch and handle missing device argument

[Dan McGee <dan-fd97jBR+K/6hPH1hqNUYSQ@public.gmane.org>]

Before:
    $ nilfs-tune -l
    nilfs-tune 2.1.0
    cannot open device -l: No such file or directory

After:
    $ ./sbin/nilfs-tune/nilfs-tune -l
    nilfs-tune 2.1.0
    Usage: nilfs-tune [-h] [-l] [-i interval] [-L volume_name]
                      [-m block_max] [-O [^]feature[,...]]
                      [-U UUID] device

Signed-off-by: Dan McGee <dan-fd97jBR+K/6hPH1hqNUYSQ@public.gmane.org>
---
 sbin/nilfs-tune/nilfs-tune.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/sbin/nilfs-tune/nilfs-tune.c b/sbin/nilfs-tune/nilfs-tune.c
index cd5ef24..6655029 100644
--- a/sbin/nilfs-tune/nilfs-tune.c
+++ b/sbin/nilfs-tune/nilfs-tune.c
@@ -187,6 +187,12 @@ static void parse_options(int argc, char *argv[],
 			exit(EXIT_FAILURE);
 		}
 	}
+
+	if (optind == argc)
+	{
+		nilfs_tune_usage();
+		exit(EXIT_FAILURE);
+	}
 }
 
 #define MINUTE	(60)
-- 
1.7.8.1

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