move check for working dir for exec functions

kyaml/fn/runtime/container/container.go

@@ -5,6 +5,7 @@ package container
 
 import (
 	"fmt"
+	"os"
 
 	runtimeexec "sigs.k8s.io/kustomize/kyaml/fn/runtime/exec"
 	"sigs.k8s.io/kustomize/kyaml/fn/runtime/runtimeutil"
@@ -139,19 +140,27 @@ func (c Filter) GetExit() error {
 }
 
 func (c *Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
-	c.setupExec()
+	if err := c.setupExec(); err != nil {
+		return nil, err
+	}
 	return c.Exec.Filter(nodes)
 }
 
-func (c *Filter) setupExec() {
+func (c *Filter) setupExec() error {
 	// don't init 2x
 	if c.Exec.Path != "" {
-		return
+		return nil
 	}
+	wd, err := os.Getwd()
+	if err != nil {
+		return err
+	}
+	c.Exec.WorkingDir = wd
 
 	path, args := c.getCommand()
 	c.Exec.Path = path
 	c.Exec.Args = args
+	return nil
 }
 
 // getArgs returns the command + args to run to spawn the container

kyaml/fn/runtime/container/container_test.go

@@ -6,6 +6,8 @@ package container
 import (
 	"bytes"
 	"fmt"
+	"github.com/stretchr/testify/require"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -128,7 +130,7 @@ metadata:
 			instance := NewContainer(tt.containerSpec, tt.UIDGID)
 			instance.Exec.FunctionConfig = cfg
 			instance.Env = append(instance.Env, "KYAML_TEST=FOO")
-			instance.setupExec()
+			assert.NoError(t, instance.setupExec())
 
 			tt.expectedArgs = append(tt.expectedArgs,
 				runtimeutil.NewContainerEnvFromStringSlice(instance.Env).GetDockerFlags()...)
@@ -173,6 +175,8 @@ metadata:
 	instance.Exec.FunctionConfig = cfg
 	instance.Exec.Path = "sed"
 	instance.Exec.Args = []string{"s/Deployment/StatefulSet/g"}
+	instance.Exec.WorkingDir = getWorkingDir(t)
+
 	output, err := instance.Filter(input)
 	if !assert.NoError(t, err) {
 		t.FailNow()
@@ -219,6 +223,7 @@ func TestFilter_ExitCode(t *testing.T) {
 	instance := Filter{}
 	instance.Exec.Path = "/not/real/command"
 	instance.Exec.DeferFailure = true
+	instance.Exec.WorkingDir = getWorkingDir(t)
 	_, err := instance.Filter(nil)
 	if !assert.NoError(t, err) {
 		t.FailNow()
@@ -231,3 +236,9 @@ func TestFilter_ExitCode(t *testing.T) {
 		t.FailNow()
 	}
 }
+
+func getWorkingDir(t *testing.T) string {
+	wd, err := os.Getwd()
+	require.NoError(t, err)
+	return wd
+}