feat: add a kubeconfig flag to specify kubeconfig file location (#133)

Signed-off-by: Liang Deng <[email protected]>

Author: YTGhost

README.md

@@ -61,13 +61,14 @@ This above command will:
 
 ### `print` command
 
-| Flag           | Default Value           | Required | Description                                                                                                                                                                             |
-| -------------- | ----------------------- | -------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| namespace      |                         | No       | If present, the namespace scope for the invocation                                                                                                                                      |
-| all-namespaces | False                   | No       | If present, list the requested object(s) across all namespaces. Namespace in the current context is ignored even if specified with --namespace                                          |
-| output         | yaml                    | No       | The output format, either yaml or json                                                                                                                                                  |
-| input_file     |                         | No       | Path to the manifest file. When set, the tool will read ingresses from the file instead of reading from the cluster. Supported files are yaml and json                                  |
+| Flag           | Default Value           | Required | Description                                                  |
+| -------------- | ----------------------- | -------- | ------------------------------------------------------------ |
+| namespace      |                         | No       | If present, the namespace scope for the invocation           |
+| all-namespaces | False                   | No       | If present, list the requested object(s) across all namespaces. Namespace in the current context is ignored even if specified with --namespace |
+| output         | yaml                    | No       | The output format, either yaml or json                       |
+| input_file     |                         | No       | Path to the manifest file. When set, the tool will read ingresses from the file instead of reading from the cluster. Supported files are yaml and json |
 | providers      | all supported providers | No       | Comma-separated list of providers. If present, the tool will try to convert only resources related to the specified providers. Otherwise it will default to all the supported providers |
+| kubeconfig     |                         | No       | The kubeconfig file to use when talking to the cluster. If the flag is not set, a set of standard locations can be searched for an existing kubeconfig file. |
 
 ## Conversion of Ingress resources to Gateway API
 

cmd/print.go

@@ -261,7 +261,3 @@ func getNamespaceInCurrentContext() (string, error) {
 
 	return currentNamespace, err
 }
-
-func init() {
-	rootCmd.AddCommand(newPrintCommand())
-}

cmd/root.go

@@ -22,12 +22,32 @@ import (
 	"github.com/spf13/cobra"
 )
 
-var rootCmd = &cobra.Command{
-	Use:   "ingress2gateway",
-	Short: "Convert Ingress manifests to Gateway API manifests",
+// kubeconfig indicates kubeconfig file location.
+var kubeconfig string
+
+func newRootCmd() *cobra.Command {
+	rootCmd := &cobra.Command{
+		Use:   "ingress2gateway",
+		Short: "Convert Ingress manifests to Gateway API manifests",
+		PersistentPreRun: func(cmd *cobra.Command, args []string) {
+			getKubeconfig()
+		},
+	}
+
+	rootCmd.PersistentFlags().StringVar(&kubeconfig, "kubeconfig", "",
+		`The kubeconfig file to use when talking to the cluster. If the flag is not set, a set of standard locations can be searched for an existing kubeconfig file.`)
+	return rootCmd
+}
+
+func getKubeconfig() {
+	if kubeconfig != "" {
+		os.Setenv("KUBECONFIG", kubeconfig)
+	}
 }
 
 func Execute() {
+	rootCmd := newRootCmd()
+	rootCmd.AddCommand(newPrintCommand())
 	err := rootCmd.Execute()
 	if err != nil {
 		os.Exit(1)