netdev - [PATCH] ip netns: Show error message if mkdir failed to create /var/run/netns

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Message-Id: <1409230964-6182-1-git-send-email-vadim4j@gmail.com>
Date:	Thu, 28 Aug 2014 16:02:44 +0300
From:	vadimk <vadim4j@...il.com>
To:	netdev@...r.kernel.org
Cc:	vadimk <vadim4j@...il.com>
Subject: [PATCH] ip netns: Show error message if mkdir failed to create /var/run/netns

Currently if mkdir failed with "Permission denied" error then "mount --make-shared ..."
error message will be showed because /var/run/netns does not exist.
---
 ip/ipnetns.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/ip/ipnetns.c b/ip/ipnetns.c
index 633b5b9..7f82908 100644
--- a/ip/ipnetns.c
+++ b/ip/ipnetns.c
@@ -407,7 +407,13 @@ static int netns_add(int argc, char **argv)
 	snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, name);
 
 	/* Create the base netns directory if it doesn't exist */
-	mkdir(NETNS_RUN_DIR, S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH);
+	if (mkdir(NETNS_RUN_DIR, S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)) {
+		if (errno != EEXIST) {
+			fprintf(stderr, "mkdir %s failed: %s\n",
+				NETNS_RUN_DIR, strerror(errno));
+			return -1;
+		}
+	}
 
 	/* Make it possible for network namespace mounts to propagate between
 	 * mount namespaces.  This makes it likely that a unmounting a network
-- 
2.0.4

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