uss: validate USS option features.snapshot-directory

This is a backport of http://review.gluster.org/#/c/9209

USS option features.snapshot-directory
   contains only 'alphanum, -, _, .'
   starts with dot (.)
   value cannot exceed 255 characters
and throws error for any other argument.

> Change-Id: Iad64635206ddf5599351020d99aafb3dd9d17bc1
> BUG: 1168819
> Signed-off-by: vmallika <vmallika@redhat.com>
> Reviewed-on: http://review.gluster.org/9209
> Smoke: Gluster Build System <jenkins@build.gluster.com>
> Reviewed-by: Avra Sengupta <asengupt@redhat.com>
> Reviewed-by: Manikandan Selvaganesh <mselvaga@redhat.com>
> Reviewed-by: Rajesh Joseph <rjoseph@redhat.com>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.com>

Change-Id: I1b85d6851a223b51714c0498b457c41db99f5f58
BUG: 1305868
Signed-off-by: vmallika <vmallika@redhat.com>
Reviewed-on: http://review.gluster.org/13409
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Rajesh Joseph <rjoseph@redhat.com>

3 files changed, 67 insertions, 35 deletions

diff --git a/tests/basic/uss.t b/tests/basic/uss.t
index 60fcadffd2e..7a4f043d260 100644
--- a/tests/basic/uss.t
+++ b/tests/basic/uss.t
@@ -68,6 +68,18 @@ for i in {1..10}; do
         TEST_IN_LOOP ! $CLI volume set $V0 features.uss $RANDOM_STRING
 done
 
+## Test that features.snapshot-directory:
+##   contains only '0-9a-z-_'
+#    starts with dot (.)
+#    value cannot exceed 255 characters
+## and throws error for any other argument.
+TEST ! $CLI volume set $V0 features.snapshot-directory a/b
+TEST ! $CLI volume set $V0 features.snapshot-directory snaps
+TEST ! $CLI volume set $V0 features.snapshot-directory -a
+TEST ! $CLI volume set $V0 features.snapshot-directory .
+TEST ! $CLI volume set $V0 features.snapshot-directory ..
+TEST ! $CLI volume set $V0 features.snapshot-directory .123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345
+
 TEST $CLI volume set $V0 features.uss enable;
 
 EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0
diff --git a/tests/bugs/snapshot/bug-1164613.t b/tests/bugs/snapshot/bug-1164613.t
deleted file mode 100644
index d7f956ce369..00000000000
--- a/tests/bugs/snapshot/bug-1164613.t
+++ /dev/null
@@ -1,34 +0,0 @@
-#!/bin/bash
-
-. $(dirname $0)/../../include.rc
-. $(dirname $0)/../../snapshot.rc
-
-cleanup;
-TEST verify_lvm_version;
-TEST glusterd;
-TEST pidof glusterd;
-
-TEST setup_lvm 1
-
-TEST $CLI volume create $V0 $H0:$L1
-TEST $CLI volume start $V0
-TEST glusterfs -s $H0 --volfile-id=$V0 $M0
-
-TEST touch $M0/testfile
-
-TEST $CLI snapshot create snaps $V0 no-timestamp
-TEST $CLI snapshot activate snaps
-TEST $CLI volume set $V0 features.uss enable
-TEST $CLI volume set $V0 snapshot-directory snaps
-
-EXPECT_WITHIN $PROCESS_UP_TIMEOUT "0" STAT $M0/snaps/snaps/testfile
-
-umount -f $M0
-
-#Clean up
-TEST $CLI snapshot delete snaps
-TEST $CLI volume stop $V0 force
-TEST $CLI volume delete $V0
-
-cleanup;
-
diff --git a/xlators/mgmt/glusterd/src/glusterd-volume-set.c b/xlators/mgmt/glusterd/src/glusterd-volume-set.c
index 09ee73aba66..7a81fad13ae 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volume-set.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volume-set.c
@@ -634,6 +634,57 @@ out:
 }
 
 static int
+validate_uss_dir (glusterd_volinfo_t *volinfo, dict_t *dict, char *key,
+                  char *value, char **op_errstr)
+{
+        char                 errstr[2048]  = "";
+        int                  ret           = -1;
+        int                  i             = 0;
+        xlator_t            *this          = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        i = strlen (value);
+        if (i > NAME_MAX) {
+                snprintf (errstr, sizeof (errstr), "value of %s exceedes %d "
+                          "characters", key, NAME_MAX);
+                goto out;
+        } else if (i < 2) {
+                snprintf (errstr, sizeof (errstr), "value of %s too short, "
+                          "expects atleast two characters", key);
+                goto out;
+        }
+
+        if (value[0] != '.') {
+                snprintf (errstr, sizeof (errstr), "%s expects value starting "
+                          "with '.' ", key);
+                goto out;
+        }
+
+        for (i = 1; value[i]; i++) {
+                if (isalnum (value[i]) || value[i] == '_' || value[i] == '-')
+                        continue;
+
+                snprintf (errstr, sizeof (errstr), "%s expects value to"
+                          " contain only '0-9a-z-_'", key);
+                goto out;
+        }
+
+        ret = 0;
+out:
+        if (ret) {
+                gf_msg (this->name, GF_LOG_ERROR, EINVAL,
+                        GD_MSG_INVALID_ENTRY, "%s", errstr);
+                *op_errstr = gf_strdup (errstr);
+        }
+
+        gf_msg_debug (this->name, 0, "Returning %d", ret);
+
+        return ret;
+}
+
+static int
 validate_stripe (glusterd_volinfo_t *volinfo, dict_t *dict, char *key,
                  char *value, char **op_errstr)
 {
@@ -1677,7 +1728,10 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .op_version  = GD_OP_VERSION_3_6_0,
           .value       = ".snaps",
           .flags       = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT,
-          .description = "Entry point directory for entering snapshot world"
+          .validate_fn = validate_uss_dir,
+          .description = "Entry point directory for entering snapshot world. "
+                         "Value can have only [0-9a-z-_] and starts with "
+                         "dot (.) and cannot exceed 255 character"
         },
 
         { .key         = "features.show-snapshot-directory",