cli: check if gsyncd is present in the configured place, enable geo-replication if present

Signed-off-by: Kaushik BV <kaushikbv@gluster.com>
Signed-off-by: Anand Avati <avati@gluster.com>

BUG: 2744 (make geo-replication package friendly)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2744

2 files changed, 122 insertions, 1 deletions

diff --git a/cli/src/cli-cmd-volume.c b/cli/src/cli-cmd-volume.c
index e49b8f23011..bb549589be6 100644
--- a/cli/src/cli-cmd-volume.c
+++ b/cli/src/cli-cmd-volume.c
@@ -1049,6 +1049,76 @@ out:
         return ret;
 }
 
+#if (SYNCDAEMON_COMPILE)
+static int
+cli_check_gsync_present ()
+{
+        FILE                *in = NULL;
+        char                buff[PATH_MAX] = {0, };
+        char                cmd[PATH_MAX + 256] = {0, };
+        char                *ptr = NULL;
+        int                 ret = 0;
+        struct stat         stat_buff;
+
+        if (strlen (GSYNCD_PREFIX)+1 > PATH_MAX-strlen("/gsyncd")) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = snprintf (cmd, sizeof(cmd), GSYNCD_PREFIX "/gsyncd");
+        if (ret < 0)
+                return 0;
+        ret = lstat (cmd, &stat_buff);
+
+        if (ret || !(stat_buff.st_mode & S_IXUSR)) {
+                gf_log ("", GF_LOG_INFO, "geo-replication not installed");
+                return -1;
+        }
+
+        ret = setenv ("_GLUSTERD_CALLED_", "1", 1);
+        if (-1 == ret) {
+                gf_log ("", GF_LOG_WARNING, "setenv syscall failed, hence could"
+                        "not assert if geo-replication is installed");
+                goto out;
+        }
+
+        memset (cmd, 0, sizeof (cmd));
+        ret = snprintf (cmd, sizeof(cmd), GSYNCD_PREFIX"/gsyncd --version");
+
+        if (!(in = popen(cmd, "r"))) {
+                gf_log ("", GF_LOG_INFO, "geo-replication not installed");
+                return -1;
+        }
+
+        ptr = fgets(buff, sizeof(buff), in);
+        if (ptr)
+                if (!strstr (buff, "gsyncd"))
+                        return -1;
+
+        ret = pclose (in);
+
+        if (ret)
+                gf_log ("", GF_LOG_ERROR, "geo-replication not installed");
+
+out:
+        gf_log ("cli", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret ? -1 : 0;
+
+}
+
+void
+cli_cmd_check_gsync_exists_cbk (struct cli_cmd *this)
+{
+
+        int             ret = 0;
+
+        ret = cli_check_gsync_present ();
+        if (ret)
+                this->disable = _gf_true;
+
+}
+#endif
+
 int
 cli_cmd_volume_gsync_set_cbk (struct cli_state *state, struct cli_cmd_word *word,
                               const char **words, int wordcount)
@@ -1167,7 +1237,8 @@ struct cli_cmd volume_cmds[] = {
 #if (SYNCDAEMON_COMPILE)
         {"volume "GEOREP" [<VOLNAME>] [<SLAVE-URL>] {start|stop|config|status} [options...]",
          cli_cmd_volume_gsync_set_cbk,
-         "Geo-sync operations"},
+         "Geo-sync operations",
+         cli_cmd_check_gsync_exists_cbk},
 #endif
 
          { "volume profile <VOLNAME> {start|info|stop}",
diff --git a/xlators/mgmt/glusterd/src/glusterd.c b/xlators/mgmt/glusterd/src/glusterd.c
index f72f058134a..b2cf345c714 100644
--- a/xlators/mgmt/glusterd/src/glusterd.c
+++ b/xlators/mgmt/glusterd/src/glusterd.c
@@ -242,6 +242,50 @@ out:
 extern int mkdir_if_missing (char *path);
 
 static int
+glusterd_check_gsync_present ()
+{
+        FILE               *in = NULL;
+        char                buff[PATH_MAX] = {0, };
+        char                cmd[PATH_MAX + 256] = {0, };
+        char               *ptr = NULL;
+        int                 ret = 0;
+
+        if (strlen (GSYNCD_PREFIX)+1 > PATH_MAX-strlen("/gsyncd")) {
+                ret = -1;
+                goto out;
+        }
+
+        snprintf (cmd, PATH_MAX, GSYNCD_PREFIX"/gsyncd --version");
+
+        if (!(in = popen(cmd, "r"))) {
+                gf_log ("", GF_LOG_INFO, "geo-replication module not installed"
+                        " in the system");
+                ret = -1;
+                goto out;
+        }
+
+        ptr = fgets(buff, sizeof(buff), in);
+        if (ptr) {
+                if (!strstr (buff, "gsyncd")) {
+                        ret = -1;
+                        goto out;
+                }
+        }
+        ret = 0;
+ out:
+        if (in)
+                if (-1 == pclose (in)) {
+                        ret = -1;
+                        gf_log ("", GF_LOG_INFO, "geo-replication module not"
+                                " installed in the system");
+                }
+
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+
+}
+
+int
 configure_syncaemon (glusterd_conf_t *conf)
 {
         int ret = 0;
@@ -273,6 +317,12 @@ configure_syncaemon (glusterd_conf_t *conf)
                         "Unable to create "GEOREP" slave log directory");
                 return -1;
         }
+        ret = glusterd_check_gsync_present ();
+        if (-1 == ret) {
+                ret = 0;
+                goto out;
+        }
+
 
         blen = snprintf (cmd, PATH_MAX, GSYNCD_PREFIX"/gsyncd -c %s/"GSYNC_CONF
                          " --config-set-rx ", conf->workdir);