fix: issue with headless installation

cmd/argocd/commands/headless/headless.go

@@ -27,6 +27,8 @@ import (
 	"github.com/argoproj/argo-cd/v2/util/cli"
 	"github.com/argoproj/argo-cd/v2/util/io"
 	"github.com/argoproj/argo-cd/v2/util/localconfig"
+
+	flag "github.com/spf13/pflag"
 )
 
 func testAPI(clientOpts *argoapi.ClientOptions) error {
@@ -43,6 +45,13 @@ func testAPI(clientOpts *argoapi.ClientOptions) error {
 	return err
 }
 
+func retrieveContextIfChanged(contextFlag *flag.Flag) string {
+	if contextFlag != nil && contextFlag.Changed {
+		return contextFlag.Value.String()
+	}
+	return ""
+}
+
 // InitCommand allows executing command in a headless mode: on the fly starts Argo CD API server and
 // changes provided client options to use started API server port
 func InitCommand(cmd *cobra.Command, clientOpts *argoapi.ClientOptions, port *int) *cobra.Command {
@@ -108,10 +117,7 @@ func InitCommand(cmd *cobra.Command, clientOpts *argoapi.ClientOptions, port *in
 			return err
 		}
 
-		var context string
-		if cmd.Flag("context").Changed {
-			context = cmd.Flag("context").Value.String()
-		}
+		context := retrieveContextIfChanged(cmd.Flag("context"))
 
 		mr, err := miniredis.Run()
 		if err != nil {

cmd/argocd/commands/headless/headless_test.go

@@ -0,0 +1,80 @@
+package headless
+
+import (
+	"testing"
+
+	flag "github.com/spf13/pflag"
+	"github.com/stretchr/testify/assert"
+)
+
+type StringFlag struct {
+	// The exact value provided on the flag
+	value string
+}
+
+func (f StringFlag) String() string {
+	return f.value
+}
+
+func (f *StringFlag) Set(value string) error {
+	f.value = value
+	return nil
+}
+
+func (f *StringFlag) Type() string {
+	return "string"
+}
+
+func Test_FlagContextNotChanged(t *testing.T) {
+	res := retrieveContextIfChanged(&flag.Flag{
+		Name:                "",
+		Shorthand:           "",
+		Usage:               "",
+		Value:               &StringFlag{value: "test"},
+		DefValue:            "",
+		Changed:             false,
+		NoOptDefVal:         "",
+		Deprecated:          "",
+		Hidden:              false,
+		ShorthandDeprecated: "",
+		Annotations:         nil,
+	})
+
+	assert.Equal(t, "", res)
+}
+
+func Test_FlagContextChanged(t *testing.T) {
+	res := retrieveContextIfChanged(&flag.Flag{
+		Name:                "",
+		Shorthand:           "",
+		Usage:               "",
+		Value:               &StringFlag{value: "test"},
+		DefValue:            "",
+		Changed:             true,
+		NoOptDefVal:         "",
+		Deprecated:          "",
+		Hidden:              false,
+		ShorthandDeprecated: "",
+		Annotations:         nil,
+	})
+
+	assert.Equal(t, "test", res)
+}
+
+func Test_FlagContextNil(t *testing.T) {
+	res := retrieveContextIfChanged(&flag.Flag{
+		Name:                "",
+		Shorthand:           "",
+		Usage:               "",
+		Value:               nil,
+		DefValue:            "",
+		Changed:             false,
+		NoOptDefVal:         "",
+		Deprecated:          "",
+		Hidden:              false,
+		ShorthandDeprecated: "",
+		Annotations:         nil,
+	})
+
+	assert.Equal(t, "", res)
+}