This is a huge commit, it does following things:

1. refactor kubesphere dependency service client creation, we can
disable dependency by config
2. dependencies can be configured by configuration file
3. refactor cmd package using cobra.Command, so we can use hypersphere
to invoke command sepearately. Later we only need to build one image to
contains all kubesphere core components. One command to rule them all!
4. live reloading configuration currently not implemented

pkg/utils/net/net.go

@@ -0,0 +1,6 @@
+package net
+
+// 0 is considered as a non valid port
+func IsValidPort(port int) bool {
+	return port > 0 && port < 65535
+}

pkg/utils/reflectutils/reflect.go

@@ -13,7 +13,9 @@ limitations under the License.
 
 package reflectutils
 
-import "reflect"
+import (
+	"reflect"
+)
 
 func In(value interface{}, container interface{}) bool {
 	containerValue := reflect.ValueOf(container)
@@ -33,3 +35,24 @@ func In(value interface{}, container interface{}) bool {
 	}
 	return false
 }
+
+func Override(left interface{}, right interface{}) {
+	if left == nil || right == nil {
+		return
+	}
+
+	if reflect.ValueOf(left).Type().Kind() != reflect.Ptr ||
+		reflect.ValueOf(right).Type().Kind() != reflect.Ptr {
+		return
+	}
+
+	old := reflect.ValueOf(left).Elem()
+	new := reflect.ValueOf(right).Elem()
+
+	for i := 0; i < old.NumField(); i++ {
+		val := new.Field(i).Interface()
+		if !reflect.DeepEqual(val, reflect.Zero(reflect.TypeOf(val)).Interface()) {
+			old.Field(i).Set(reflect.ValueOf(val))
+		}
+	}
+}

pkg/utils/signals/signal.go

@@ -0,0 +1,43 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package signals
+
+import (
+	"os"
+	"os/signal"
+)
+
+var onlyOneSignalHandler = make(chan struct{})
+
+// SetupSignalHandler registered for SIGTERM and SIGINT. A stop channel is returned
+// which is closed on one of these signals. If a second signal is caught, the program
+// is terminated with exit code 1.
+func SetupSignalHandler() (stopCh <-chan struct{}) {
+	close(onlyOneSignalHandler) // panics when called twice
+
+	stop := make(chan struct{})
+	c := make(chan os.Signal, 2)
+	signal.Notify(c, shutdownSignals...)
+	go func() {
+		<-c
+		close(stop)
+		<-c
+		os.Exit(1) // second signal. Exit directly.
+	}()
+
+	return stop
+}

pkg/utils/signals/signal_posix.go

@@ -0,0 +1,26 @@
+// +build !windows
+
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package signals
+
+import (
+	"os"
+	"syscall"
+)
+
+var shutdownSignals = []os.Signal{os.Interrupt, syscall.SIGTERM}

pkg/utils/signals/signal_windows.go

@@ -0,0 +1,23 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package signals
+
+import (
+	"os"
+)
+
+var shutdownSignals = []os.Signal{os.Interrupt}

pkg/utils/term/term.go

@@ -0,0 +1,22 @@
+package term
+
+import (
+	"fmt"
+	"github.com/docker/docker/pkg/term"
+	"io"
+)
+
+// TerminalSize returns the current width and height of the user's terminal. If it isn't a terminal,
+// nil is returned. On error, zero values are returned for width and height.
+// Usually w must be the stdout of the process. Stderr won't work.
+func TerminalSize(w io.Writer) (int, int, error) {
+	outFd, isTerminal := term.GetFdInfo(w)
+	if !isTerminal {
+		return 0, 0, fmt.Errorf("given writer is no terminal")
+	}
+	winsize, err := term.GetWinsize(outFd)
+	if err != nil {
+		return 0, 0, err
+	}
+	return int(winsize.Width), int(winsize.Height), nil
+}