add --as-current-user flag to fn run

cmd/config/internal/commands/run-fns.go

@@ -70,6 +70,8 @@ func GetRunFnRunner(name string) *RunFnRunner {
 	r.Command.Flags().StringArrayVarP(
 		&r.Env, "env", "e", []string{},
 		"a list of environment variables to be used by functions")
+	r.Command.Flags().BoolVar(
+		&r.AsCurrentUser, "as-current-user", false, "use the uid and gid that kpt is running with to run the function in the container")
 	return r
 }
 
@@ -97,6 +99,7 @@ type RunFnRunner struct {
 	Mounts             []string
 	LogSteps           bool
 	Env                []string
+	AsCurrentUser      bool
 }
 
 func (r *RunFnRunner) runE(c *cobra.Command, args []string) error {
@@ -312,6 +315,7 @@ func (r *RunFnRunner) preRunE(c *cobra.Command, args []string) error {
 		ResultsDir:     r.ResultsDir,
 		LogSteps:       r.LogSteps,
 		Env:            r.Env,
+		AsCurrentUser:  r.AsCurrentUser,
 	}
 
 	// don't consider args for the function

cmd/config/internal/commands/run_test.go

@@ -300,6 +300,16 @@ apiVersion: v1
 				Env:  []string{"FOO=BAR", "BAR"},
 			},
 		},
+		{
+			name: "as current user",
+			args: []string{"run", "dir", "--as-current-user"},
+			path: "dir",
+			expectedStruct: &runfn.RunFns{
+				Path:          "dir",
+				AsCurrentUser: true,
+				Env:           []string{},
+			},
+		},
 	}
 
 	for i := range tests {