edgesite support --minconfig subcommand

Signed-off-by: zhangjie <iamkadisi@163.com>

2 files changed, 108 insertions, 0 deletions

diff --git a/edgesite/cmd/app/flags/flags.go b/edgesite/cmd/app/flags/flags.go
new file mode 100644
index 000000000..cac238e93
--- /dev/null
+++ b/edgesite/cmd/app/flags/flags.go
@@ -0,0 +1,105 @@
+/*
+Copyright 2020 The KubeEdge 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 flags
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+
+	flag "github.com/spf13/pflag"
+	"sigs.k8s.io/yaml"
+
+	"github.com/kubeedge/kubeedge/pkg/apis/edgesite/v1alpha1"
+)
+
+type minConfigValue int
+
+const (
+	MinConfigFalse minConfigValue = 0
+	MinConfigTrue  minConfigValue = 1
+	// TODO support json output (default yaml ) @kadisi
+)
+
+func (m *minConfigValue) IsBoolFlag() bool {
+	return true
+}
+
+func (m *minConfigValue) Get() interface{} {
+	return minConfigValue(*m)
+}
+
+func (m *minConfigValue) Set(s string) error {
+	boolVal, err := strconv.ParseBool(s)
+	if boolVal {
+		*m = MinConfigTrue
+	} else {
+		*m = MinConfigFalse
+	}
+	return err
+}
+
+func (m *minConfigValue) String() string {
+	return fmt.Sprintf("%v", bool(*m == MinConfigTrue))
+}
+
+// The type of the flag as required by the pflag.Value interface
+func (m *minConfigValue) Type() string {
+	return "minconfig"
+}
+
+func MinConfigVar(p *minConfigValue, name string, value minConfigValue, usage string) {
+	*p = value
+	flag.Var(p, name, usage)
+	// "--minconfig" will be treated as "--minconfig=true"
+	flag.Lookup(name).NoOptDefVal = "true"
+}
+
+func minConfig(name string, value minConfigValue, usage string) *minConfigValue {
+	p := new(minConfigValue)
+	MinConfigVar(p, name, value, usage)
+	return p
+}
+
+const minConfigFlagName = "minconfig"
+
+var (
+	minConfigFlag = minConfig(minConfigFlagName, MinConfigFalse, "Print min configuration for reference, users can refer to it to create their own configuration files")
+)
+
+// AddFlags registers this package's flags on arbitrary FlagSets, such that they point to the
+// same value as the global flags.
+func AddFlags(fs *flag.FlagSet) {
+	fs.AddFlag(flag.Lookup(minConfigFlagName))
+}
+
+// PrintMinConfigAndExitIfRequested will check if the -minconfig flag was passed
+// and, if so, print the min config and exit.
+func PrintMinConfigAndExitIfRequested() {
+	if *minConfigFlag == MinConfigTrue {
+		config := v1alpha1.NewMinEdgeSiteConfig()
+		data, err := yaml.Marshal(config)
+		if err != nil {
+			fmt.Printf("Marshal edgesite min config to yaml error %v\n", err)
+			os.Exit(1)
+		}
+		fmt.Println("# With --minconfig , you can easily used this configurations as reference.")
+		fmt.Println("# It's useful to users who are new to KubeEdge, and you can modify/create your own configs accordingly. ")
+		fmt.Println("# This configuration is suitable for beginners.")
+		fmt.Printf("\n%v\n\n", string(data))
+		os.Exit(0)
+	}
+}
diff --git a/edgesite/cmd/app/server.go b/edgesite/cmd/app/server.go
index cba70d91e..25832273d 100644
--- a/edgesite/cmd/app/server.go
+++ b/edgesite/cmd/app/server.go
@@ -14,6 +14,7 @@ import (
 	"github.com/kubeedge/kubeedge/edge/pkg/common/dbm"
 	"github.com/kubeedge/kubeedge/edge/pkg/edged"
 	"github.com/kubeedge/kubeedge/edge/pkg/metamanager"
+	"github.com/kubeedge/kubeedge/edgesite/cmd/app/flags"
 	"github.com/kubeedge/kubeedge/edgesite/cmd/app/options"
 	"github.com/kubeedge/kubeedge/pkg/util/flag"
 	"github.com/kubeedge/kubeedge/pkg/version"
@@ -31,6 +32,7 @@ It is also responsible for storing/retrieving metadata to/from a lightweight dat
 runs on edge nodes and manages containerized applications.`,
 		Run: func(cmd *cobra.Command, args []string) {
 			verflag.PrintAndExitIfRequested()
+			flags.PrintMinConfigAndExitIfRequested()
 			flag.PrintFlags(cmd.Flags())
 
 			// To help debugging, immediately log version
@@ -44,6 +46,7 @@ runs on edge nodes and manages containerized applications.`,
 	fs := cmd.Flags()
 	namedFs := opts.Flags()
 	verflag.AddFlags(namedFs.FlagSet("global"))
+	flags.AddFlags(namedFs.FlagSet("global"))
 	globalflag.AddGlobalFlags(namedFs.FlagSet("global"), cmd.Name())
 	for _, f := range namedFs.FlagSets {
 		fs.AddFlagSet(f)