[PATCHv2] nilfs2-utils: change the error message of nilfs-tune properlyx

[Jiro SEKIBA <jir-hfpbi5WX9J54Eiagz67IpQ@public.gmane.org>]

Hi,

Change the error message of nilfs-tune when user doesn't have
a permission to access the device to show the cause of error clearly.

differences from v1
- moved the error string behind the primary message.

Signed-off-by: Jiro SEKIBA <jir-hfpbi5WX9J54Eiagz67IpQ@public.gmane.org>
---
 sbin/nilfs-tune/nilfs-tune.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/sbin/nilfs-tune/nilfs-tune.c b/sbin/nilfs-tune/nilfs-tune.c
index d99ce46..e80caa4 100644
--- a/sbin/nilfs-tune/nilfs-tune.c
+++ b/sbin/nilfs-tune/nilfs-tune.c
@@ -399,10 +399,12 @@ int modify_nilfs(char *device, struct nilfs_tune_options *opts)
 	struct nilfs_super_block *sbp;
 	__u64 features;
 
+	errno = 0;
 	devfd = open(device, opts->flags);
 
 	if (devfd == -1) {
-		fprintf(stderr, "%s: cannot open NILFS\n", device);
+		fprintf(stderr, "cannot open device %s: %s\n",
+			device, strerror(errno));
 		ret = EXIT_FAILURE;
 		goto out;
 	}
-- 
1.5.6.5

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