diff --git a/README.md b/README.md
index 7bb5acc..03847a7 100644
--- a/README.md
+++ b/README.md
@@ -40,14 +40,14 @@ Pre-built binary for Linux x86_64 is available at [Github releases](https://gith
 # Job Run Process
 
 
-PreSyncing           Syncing                               Success
-+-----------+     +-----------+    +-------------+     +--------------+
-|  pre-job  +--+->|  job run  +--->|  post-exec  +-+-->| post-success |
-+-----------+  ^  +-----------+    +-------------+ |   +--------------+
-               |                                   |
-               |      +-----------------+          | Failed
-               +------+    post-fail    |<---------+
-                      +-----------------+
+PreSyncing                           Syncing                               Success
++-----------+     +----------+    +-----------+    +-------------+     +--------------+
+|  pre-job  +--+->| pre-exec +--->|  job run  +--->|  post-exec  +-+-->| post-success |
++-----------+  ^  +----------+    +-----------+    +-------------+ |   +--------------+
+               |                                                   |
+               |                +-----------------+                | Failed
+               +----------------+    post-fail    |<---------------+
+                                +-----------------+
 ```
 
 
diff --git a/manager/server_test.go b/manager/server_test.go
index 7f4b0ea..e0ece22 100644
--- a/manager/server_test.go
+++ b/manager/server_test.go
@@ -109,7 +109,7 @@ func TestHTTPServer(t *testing.T) {
 				So(res[_errorKey], ShouldEqual, "invalid workerID "+invalidWorker)
 			})
 
-			Convey("flush  disabled jobs", func(ctx C) {
+			Convey("flush disabled jobs", func(ctx C) {
 				req, err := http.NewRequest("DELETE", baseURL+"/jobs/disabled", nil)
 				So(err, ShouldBeNil)
 				clt := &http.Client{}
diff --git a/worker/cgroup.go b/worker/cgroup.go
index f25cdd3..cf2b572 100644
--- a/worker/cgroup.go
+++ b/worker/cgroup.go
@@ -17,7 +17,6 @@ import (
 
 type cgroupHook struct {
 	emptyHook
-	provider  mirrorProvider
 	basePath  string
 	baseGroup string
 	created   bool
@@ -36,7 +35,9 @@ func newCgroupHook(p mirrorProvider, basePath, baseGroup, subsystem, memLimit st
 		subsystem = "cpu"
 	}
 	return &cgroupHook{
-		provider:  p,
+		emptyHook: emptyHook{
+			provider: p,
+		},
 		basePath:  basePath,
 		baseGroup: baseGroup,
 		subsystem: subsystem,
diff --git a/worker/docker.go b/worker/docker.go
index 852e67e..0993417 100644
--- a/worker/docker.go
+++ b/worker/docker.go
@@ -7,10 +7,9 @@ import (
 
 type dockerHook struct {
 	emptyHook
-	provider mirrorProvider
-	image    string
-	volumes  []string
-	options  []string
+	image   string
+	volumes []string
+	options []string
 }
 
 func newDockerHook(p mirrorProvider, gCfg dockerConfig, mCfg mirrorConfig) *dockerHook {
@@ -23,10 +22,12 @@ func newDockerHook(p mirrorProvider, gCfg dockerConfig, mCfg mirrorConfig) *dock
 	options = append(options, mCfg.DockerOptions...)
 
 	return &dockerHook{
-		provider: p,
-		image:    mCfg.DockerImage,
-		volumes:  volumes,
-		options:  options,
+		emptyHook: emptyHook{
+			provider: p,
+		},
+		image:   mCfg.DockerImage,
+		volumes: volumes,
+		options: options,
 	}
 }
 
diff --git a/worker/docker_test.go b/worker/docker_test.go
index 29526c2..a3bd5ac 100644
--- a/worker/docker_test.go
+++ b/worker/docker_test.go
@@ -55,8 +55,10 @@ sleep 10
 		So(err, ShouldBeNil)
 
 		d := &dockerHook{
-			provider: provider,
-			image:    "alpine",
+			emptyHook: emptyHook{
+				provider: provider,
+			},
+			image: "alpine",
 			volumes: []string{
 				fmt.Sprintf("%s:%s", cmdScript, "/bin/cmd.sh"),
 			},
diff --git a/worker/exec_post_hook.go b/worker/exec_post_hook.go
index 22a9ec6..a2c564c 100644
--- a/worker/exec_post_hook.go
+++ b/worker/exec_post_hook.go
@@ -18,7 +18,6 @@ const (
 
 type execPostHook struct {
 	emptyHook
-	provider mirrorProvider
 
 	// exec on success or on failure
 	execOn uint8
@@ -37,9 +36,11 @@ func newExecPostHook(provider mirrorProvider, execOn uint8, command string) (*ex
 	}
 
 	return &execPostHook{
-		provider: provider,
-		execOn:   execOn,
-		command:  cmd,
+		emptyHook: emptyHook{
+			provider: provider,
+		},
+		execOn:  execOn,
+		command: cmd,
 	}, nil
 }
 
diff --git a/worker/loglimit_hook.go b/worker/loglimit_hook.go
index b3ddffb..57b78fa 100644
--- a/worker/loglimit_hook.go
+++ b/worker/loglimit_hook.go
@@ -14,12 +14,13 @@ import (
 
 type logLimiter struct {
 	emptyHook
-	provider mirrorProvider
 }
 
 func newLogLimiter(provider mirrorProvider) *logLimiter {
 	return &logLimiter{
-		provider: provider,
+		emptyHook: emptyHook{
+			provider: provider,
+		},
 	}
 }
 
diff --git a/worker/provider.go b/worker/provider.go
index 90c9c0e..7ea6b60 100644
--- a/worker/provider.go
+++ b/worker/provider.go
@@ -141,10 +141,10 @@ func newMirrorProvider(mirror mirrorConfig, cfg *Config) mirrorProvider {
 			retry:       mirror.Retry,
 		}
 		p, err := newRsyncProvider(rc)
-		p.isMaster = isMaster
 		if err != nil {
 			panic(err)
 		}
+		p.isMaster = isMaster
 		provider = p
 	case provTwoStageRsync:
 		rc := twoStageRsyncConfig{
diff --git a/worker/zfs_hook.go b/worker/zfs_hook.go
index 36f3e50..35c3cdb 100644
--- a/worker/zfs_hook.go
+++ b/worker/zfs_hook.go
@@ -11,14 +11,15 @@ import (
 
 type zfsHook struct {
 	emptyHook
-	provider mirrorProvider
-	zpool    string
+	zpool string
 }
 
 func newZfsHook(provider mirrorProvider, zpool string) *zfsHook {
 	return &zfsHook{
-		provider: provider,
-		zpool:    zpool,
+		emptyHook: emptyHook{
+			provider: provider,
+		},
+		zpool: zpool,
 	}
 }
 
@@ -40,12 +41,12 @@ func (z *zfsHook) printHelpMessage() {
 func (z *zfsHook) preJob() error {
 	workingDir := z.provider.WorkingDir()
 	if _, err := os.Stat(workingDir); os.IsNotExist(err) {
-		logger.Errorf("Directory %s doesn't exist", workingDir);
+		logger.Errorf("Directory %s doesn't exist", workingDir)
 		z.printHelpMessage()
 		return err
 	}
 	if err := sh.Command("mountpoint", "-q", workingDir).Run(); err != nil {
-		logger.Errorf("%s is not a mount point", workingDir);
+		logger.Errorf("%s is not a mount point", workingDir)
 		z.printHelpMessage()
 		return err
 	}