Logic for the helm env command

Signed-off-by: Vibhav Bobade <vibhav.bobde@gmail.com>

cmd/helm/env.go

@@ -0,0 +1,102 @@
+/*
+Copyright The Helm 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 main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"helm.sh/helm/pkg/helmpath"
+	"helm.sh/helm/pkg/helmpath/xdg"
+
+	"helm.sh/helm/pkg/cli"
+
+	"helm.sh/helm/pkg/plugin"
+
+	"github.com/spf13/cobra"
+
+	"helm.sh/helm/cmd/helm/require"
+)
+
+var (
+	envHelp = `
+Env prints out all the environment information in use by Helm.
+`
+)
+
+func newEnvCmd(out io.Writer) *cobra.Command {
+	o := &envOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "env",
+		Short: "environment information in use the Helm client",
+		Long:  envHelp,
+		Args:  require.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return o.run(out)
+		},
+	}
+
+	return cmd
+}
+
+type envOptions struct {
+}
+
+// run .
+func (o *envOptions) run(out io.Writer) error {
+	plugin.SetupPluginEnv(&cli.EnvSettings{}, "", "")
+	o.setXdgPaths()
+	o.setGoPaths()
+	for _, prefix := range []string{
+		"HELM_",
+		"XDG_",
+		"GO",
+	} {
+		for _, e := range os.Environ() {
+			if strings.HasPrefix(e, prefix) {
+				fmt.Println(e)
+			}
+		}
+	}
+	return nil
+}
+
+func (o *envOptions) setXdgPaths() {
+	for key, val := range map[string]string{
+		xdg.CacheHomeEnvVar:  helmpath.CachePath(),
+		xdg.ConfigHomeEnvVar: helmpath.ConfigPath(),
+		xdg.DataHomeEnvVar:   helmpath.DataPath(),
+	} {
+		if eVal := os.Getenv(key); len(eVal) <= 0 {
+			os.Setenv(key, val)
+		}
+	}
+}
+
+func (o *envOptions) setGoPaths() {
+	for key, val := range map[string]string{
+		"GOPATH": "~/go",
+		"GOBIN":  "~/go/bin",
+	} {
+		if eVal := os.Getenv(key); len(eVal) <= 0 {
+			os.Setenv(key, val)
+		}
+	}
+}

cmd/helm/root.go

@@ -172,6 +172,7 @@ func newRootCmd(actionConfig *action.Configuration, out io.Writer, args []string
 		newUpgradeCmd(actionConfig, out),
 
 		newCompletionCmd(out),
+		newEnvCmd(out),
 		newPluginCmd(out),
 		newVersionCmd(out),