glusterd: Added glusterd command specific optional args for hooks scripts.

start volume: --first=yes if the volume is the first to be started
              and --first=no otherwise

stop volume: --last=yes if the volume is the last to be stopped
              and --last=no otherwise

set volume: -o key=value ... for every key, value supplied in
            volume set command

Change-Id: Ia8530771f8b9d7424fd1c736cb4c3622b5cabec2
BUG: 806996
Signed-off-by: Krishnan Parthasarathi <kp@gluster.com>
Reviewed-on: http://review.gluster.com/3260
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>

3 files changed, 116 insertions, 3 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-hooks.c b/xlators/mgmt/glusterd/src/glusterd-hooks.c
index ba73364bd..2afdb1625 100644
--- a/xlators/mgmt/glusterd/src/glusterd-hooks.c
+++ b/xlators/mgmt/glusterd/src/glusterd-hooks.c
@@ -37,6 +37,8 @@
 #include "glusterd-store.h"
 #include "glusterd-hooks.h"
 
+#include <fnmatch.h>
+
 extern int mkdir_if_missing (char *dir);
 
 #define EMPTY ""
@@ -151,7 +153,110 @@ glusterd_hooks_get_hooks_cmd_subdir (glusterd_op_t op)
 }
 
 int
-glusterd_hooks_run_hooks (char *hooks_path, dict_t *op_ctx)
+glusterd_hooks_set_volume_args (dict_t *dict, runner_t *runner)
+{
+        int     i               = 0;
+        int     count           = 0;
+        int     ret             = -1;
+        char    query[1024]     = {0,};
+        char    *key            = NULL;
+        char    *value          = NULL;
+
+        ret = dict_get_int32 (dict, "count", &count);
+        if (ret)
+                goto out;
+
+        /* This will not happen unless op_ctx
+         * is corrupted*/
+        if (!count)
+                goto out;
+
+        runner_add_arg (runner, "-o");
+        for (i = 1; (ret == 0); i++) {
+                snprintf (query, sizeof (query), "key%d", i);
+                ret = dict_get_str (dict, query, &key);
+                if (ret)
+                       continue;
+
+                snprintf (query, sizeof (query), "value%d", i);
+                ret = dict_get_str (dict, query, &value);
+                if (ret)
+                       continue;
+
+                runner_argprintf (runner, "%s=%s", key, value);
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+static int
+glusterd_hooks_add_op_args (runner_t *runner, glusterd_op_t op,
+                            dict_t *op_ctx, glusterd_commit_hook_type_t type)
+{
+        int                     vol_count        = 0;
+        gf_boolean_t            truth            = _gf_false;
+        glusterd_volinfo_t      *voliter         = NULL;
+        glusterd_conf_t         *priv            = NULL;
+        int                     ret              = -1;
+
+        priv = THIS->private;
+        list_for_each_entry (voliter, &priv->volumes,
+                             vol_list) {
+                if (glusterd_is_volume_started (voliter))
+                        vol_count++;
+        }
+
+        ret = 0;
+        switch (op) {
+                case GD_OP_START_VOLUME:
+                        if (type == GD_COMMIT_HOOK_PRE &&
+                            vol_count == 0)
+                                truth = _gf_true;
+
+                        else if (type == GD_COMMIT_HOOK_POST &&
+                                 vol_count == 1)
+                                truth = _gf_true;
+
+                        else
+                                truth = _gf_false;
+
+                        runner_argprintf (runner, "--first=%s",
+                                          truth? "yes":"no");
+                        break;
+
+                case GD_OP_STOP_VOLUME:
+                        if (type == GD_COMMIT_HOOK_PRE &&
+                            vol_count == 1)
+                                truth = _gf_true;
+
+                        else if (type == GD_COMMIT_HOOK_POST &&
+                                 vol_count == 0)
+                                truth = _gf_true;
+
+                        else
+                                truth = _gf_false;
+
+                        runner_argprintf (runner, "--last=%s",
+                                          truth? "yes":"no");
+                        break;
+
+                case GD_OP_SET_VOLUME:
+                        ret = glusterd_hooks_set_volume_args (op_ctx, runner);
+                        break;
+
+                default:
+                        break;
+
+        }
+
+        return ret;
+}
+
+int
+glusterd_hooks_run_hooks (char *hooks_path, glusterd_op_t op, dict_t *op_ctx,
+                          glusterd_commit_hook_type_t type)
 {
         xlator_t        *this                   = NULL;
         glusterd_conf_t *priv                   = NULL;
@@ -221,6 +326,13 @@ glusterd_hooks_run_hooks (char *hooks_path, dict_t *op_ctx)
                 runner_argprintf (&runner, "%s/%s", hooks_path, lines[lineno]);
                 /*Add future command line arguments to hook scripts below*/
                 runner_argprintf (&runner, "--volname=%s", volname);
+                ret = glusterd_hooks_add_op_args (&runner, op, op_ctx, type);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to add "
+                                "command specific arguments");
+                        goto out;
+                }
+
                 ret = runner_run_reuse (&runner);
                 if (ret) {
                         runner_log (&runner, this->name, GF_LOG_ERROR,
diff --git a/xlators/mgmt/glusterd/src/glusterd-hooks.h b/xlators/mgmt/glusterd/src/glusterd-hooks.h
index a57eab0fa..02d9e4331 100644
--- a/xlators/mgmt/glusterd/src/glusterd-hooks.h
+++ b/xlators/mgmt/glusterd/src/glusterd-hooks.h
@@ -45,5 +45,6 @@ char *
 glusterd_hooks_get_hooks_cmd_subdir (glusterd_op_t op);
 
 int
-glusterd_hooks_run_hooks (char *hooks_path, dict_t *op_ctx);
+glusterd_hooks_run_hooks (char *hooks_path, glusterd_op_t op, dict_t *op_ctx,
+                          glusterd_commit_hook_type_t type);
 #endif
diff --git a/xlators/mgmt/glusterd/src/glusterd-op-sm.c b/xlators/mgmt/glusterd/src/glusterd-op-sm.c
index 3b6f679ed..07f35642b 100644
--- a/xlators/mgmt/glusterd/src/glusterd-op-sm.c
+++ b/xlators/mgmt/glusterd/src/glusterd-op-sm.c
@@ -2286,7 +2286,7 @@ glusterd_op_commit_hook (glusterd_op_t op, dict_t *op_ctx,  glusterd_commit_hook
         snprintf (scriptdir, sizeof (scriptdir), "%s/%s/%s",
                   hookdir, cmd_subdir, type_subdir);
 
-        return glusterd_hooks_run_hooks (scriptdir, op_ctx);
+        return glusterd_hooks_run_hooks (scriptdir, op, op_ctx, type);
 }
 
 static int