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explain.go
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explain.go
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// Copyright © 2017 The Kubicorn 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 cmd
import (
"encoding/json"
"errors"
"fmt"
"os"
"github.com/kubicorn/kubicorn/apis/cluster"
"github.com/kubicorn/kubicorn/pkg"
"github.com/kubicorn/kubicorn/pkg/cli"
"github.com/kubicorn/kubicorn/pkg/initapi"
"github.com/kubicorn/kubicorn/pkg/logger"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
type OutputData struct {
Actual *cluster.Cluster
Expected *cluster.Cluster
}
// ExplainCmd represents the explain command
func ExplainCmd() *cobra.Command {
var exo = &cli.ExplainOptions{}
var cmd = &cobra.Command{
Use: "explain",
Short: "Explain cluster",
Long: `Output expected and actual state of the given cluster`,
Run: func(cmd *cobra.Command, args []string) {
switch len(args) {
case 0:
exo.Name = viper.GetString(keyKubicornName)
case 1:
exo.Name = args[0]
default:
logger.Critical("Too many arguments.")
os.Exit(1)
}
if err := runExplain(exo); err != nil {
logger.Critical(err.Error())
os.Exit(1)
}
},
}
fs := cmd.Flags()
bindCommonStateStoreFlags(&exo.StateStoreOptions, fs)
bindCommonAwsFlags(&exo.AwsOptions, fs)
fs.StringVarP(&exo.Output, keyOutput, "o", viper.GetString(keyOutput), descOutput)
fs.StringVar(&exo.GitRemote, keyGitConfig, viper.GetString(keyGitConfig), descGitConfig)
return cmd
}
func runExplain(options *cli.ExplainOptions) error {
// Ensure we have a name
name := options.Name
if name == "" {
return errors.New("Empty name. Must specify the name of the cluster to apply")
}
// Expand state store path
options.StateStorePath = cli.ExpandPath(options.StateStorePath)
// Register state store
stateStore, err := options.NewStateStore()
if err != nil {
return err
} else if !stateStore.Exists() {
return fmt.Errorf("State store [%s] does not exists, can't edit", name)
}
cluster, err := stateStore.GetCluster()
if err != nil {
return fmt.Errorf("Unable to get cluster [%s]: %v", name, err)
}
cluster, err = initapi.InitCluster(cluster)
if err != nil {
return err
}
runtimeParams := &pkg.RuntimeParameters{}
if len(options.AwsProfile) > 0 {
runtimeParams.AwsProfile = options.AwsProfile
}
reconciler, err := pkg.GetReconciler(cluster, runtimeParams)
if err != nil {
return fmt.Errorf("Unable to get reconciler: %v", err)
}
var d OutputData
d.Actual, err = reconciler.Actual(cluster)
if err != nil {
return fmt.Errorf("Unable to get actual cluster: %v", err)
}
d.Expected, err = reconciler.Expected(cluster)
if err != nil {
return fmt.Errorf("Unable to get expected cluster: %v", err)
}
if options.Output == "json" {
o, err := json.MarshalIndent(d, "", "\t")
if err != nil {
return fmt.Errorf("Unable to parse cluster: %v", err)
}
fmt.Printf("%s\n", o)
} else {
return fmt.Errorf("Unsupported output format")
}
return nil
}