glusterd: glusterd fails to start if peers file has blank line

Problem:
On start of glusterd service, glusterd fetch data from store, while
parsing data from store if peers file consists of blank line glusterd
fails to start.

Fix:
With this fix while parsing peers file glusterd will skip blank lines
if it contains any.

>Reviewed-on: https://review.gluster.org/18066
>Tested-by: Gaurav Yadav <gyadav@redhat.com>
>Smoke: Gluster Build System <jenkins@build.gluster.org>
>Reviewed-by: Prashanth Pai <ppai@redhat.com>
>CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
>Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
>Reviewed-by: Niels de Vos <ndevos@redhat.com>

Change-Id: I53cd65a54de5f57baef292b2118b70ffb7f99388
BUG: 1486107
Signed-off-by: Gaurav Yadav <gyadav@redhat.com>
Reviewed-on: https://review.gluster.org/18124
Reviewed-by: Prashanth Pai <ppai@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>

2 files changed, 33 insertions, 0 deletions

diff --git a/libglusterfs/src/store.c b/libglusterfs/src/store.c
index 199ba2960d1..e805f20bb4c 100644
--- a/libglusterfs/src/store.c
+++ b/libglusterfs/src/store.c
@@ -195,6 +195,7 @@ gf_store_read_and_tokenize (FILE *file, char *str, int size, char **iter_key,
         GF_ASSERT (iter_val);
         GF_ASSERT (store_errno);
 
+retry:
         temp = fgets (str, size, file);
         if (temp == NULL || feof (file)) {
                 ret = -1;
@@ -202,6 +203,9 @@ gf_store_read_and_tokenize (FILE *file, char *str, int size, char **iter_key,
                 goto out;
         }
 
+        if (strcmp (str, "\n") == 0)
+                goto retry;
+
         str_len = strlen(str);
         str[str_len - 1] = '\0';
         /* Truncate the "\n", as fgets stores "\n" in str */
diff --git a/tests/bugs/glusterd/bug-1482906-peer-file-blank-line.t b/tests/bugs/glusterd/bug-1482906-peer-file-blank-line.t
new file mode 100644
index 00000000000..967595e4dbb
--- /dev/null
+++ b/tests/bugs/glusterd/bug-1482906-peer-file-blank-line.t
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../cluster.rc
+
+#Tests for add new line in peers file
+function add_new_line_to_peer_file  {
+	UUID_NAME=$($CLI_1 peer status  | grep Uuid)
+	PEER_ID=$(echo $UUID_NAME | cut -c 7-)
+	GD_WD=$($CLI_1 system getwd)
+	GD_WD+=/peers/
+	PATH_TO_PEER_FILE=$GD_WD$PEER_ID
+	sed -i '1s/^/\n/gm; $s/$/\n/gm' $PATH_TO_PEER_FILE
+}
+
+cleanup;
+
+TEST launch_cluster 2;
+
+TEST $CLI_1 peer probe $H2;
+
+EXPECT_WITHIN $PROBE_TIMEOUT 1 peer_count
+
+add_new_line_to_peer_file
+
+TEST kill_glusterd 1
+TEST  $glusterd_1
+
+cleanup;