glusterd: initialize the daemon services on demand

Backport of http://review.gluster.org/#/c/11488/

As of now all the daemon services are initialized at glusterD init path. Since
socket file path of per node daemon demands the uuid of the node, MY_UUID macro
is invoked as part of the initialization.

The above flow breaks the usecases where a gluster image is built following a
template could be Dockerfile, Vagrantfile or any kind of virtualization
environment. This means bringing instances of this image would have same UUIDs
for the node resulting in peer probe failure.

Solution is to lazily initialize the services on demand.

Change-Id: If7caa533026c83e98c7c7678bded67085d0bbc1e
BUG: 1247012
Signed-off-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-on: http://review.gluster.org/11488
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Gaurav Kumar Garg <ggarg@redhat.com>
Reviewed-by: Kaushal M <kaushal@redhat.com>
Reviewed-on: http://review.gluster.org/11766

1 files changed, 22 insertions, 4 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-shd-svc.c b/xlators/mgmt/glusterd/src/glusterd-shd-svc.c
index 49454cc5875..f9f41898b39 100644
--- a/xlators/mgmt/glusterd/src/glusterd-shd-svc.c
+++ b/xlators/mgmt/glusterd/src/glusterd-shd-svc.c
@@ -18,13 +18,18 @@
 
 char *shd_svc_name = "glustershd";
 
+void
+glusterd_shdsvc_build (glusterd_svc_t *svc)
+{
+        svc->manager = glusterd_shdsvc_manager;
+        svc->start = glusterd_shdsvc_start;
+        svc->stop = glusterd_svc_stop;
+}
+
 int
 glusterd_shdsvc_init (glusterd_svc_t *svc)
 {
-        return glusterd_svc_init (svc, shd_svc_name,
-                                  glusterd_shdsvc_manager,
-                                  glusterd_shdsvc_start,
-                                  glusterd_svc_stop);
+        return glusterd_svc_init (svc, shd_svc_name);
 }
 
 static int
@@ -80,6 +85,19 @@ glusterd_shdsvc_manager (glusterd_svc_t *svc, void *data, int flags)
         int                 ret     = 0;
         glusterd_volinfo_t *volinfo = NULL;
 
+        if (!svc->inited) {
+                ret = glusterd_shdsvc_init (svc);
+                if (ret) {
+                        gf_msg (THIS->name, GF_LOG_ERROR, 0,
+                                GD_MSG_FAILED_INIT_SHDSVC, "Failed to init shd "
+                                "service");
+                        goto out;
+                } else {
+                        svc->inited = _gf_true;
+                        gf_msg_debug (THIS->name, 0, "shd service initialized");
+                }
+        }
+
         volinfo = data;
 
         /* If all the volumes are stopped or all shd compatible volumes