Fix kube.Exec to not include passed cmd two times (kanisterio#789)

* Fix kube.Exec to not include passed cmd two times

Per current implementation if we pass a command to
kube.Exec it is being passed twice in query parameter
to exec subresource to pod.
This PR tries to change that and we will now just have
the command once.

* Add test for kopia command

* Apply suggestions from code review

* Add nolint

Co-authored-by: Pavan Navarathna <pavan@kasten.io>

pkg/kube/exec.go

@@ -70,9 +70,7 @@ func ExecWithOptions(kubeCli kubernetes.Interface, options ExecOptions) (string,
 	if len(options.ContainerName) != 0 {
 		req.Param("container", options.ContainerName)
 	}
-	for _, c := range options.Command {
-		req.Param("command", c)
-	}
+
 	req.VersionedParams(&v1.PodExecOptions{
 		Container: options.ContainerName,
 		Command:   options.Command,

pkg/kube/exec_test.go

@@ -19,6 +19,7 @@ package kube
 import (
 	"bytes"
 	"context"
+	"strings"
 	"time"
 
 	. "gopkg.in/check.v1"
@@ -36,6 +37,7 @@ type ExecSuite struct {
 var _ = Suite(&ExecSuite{})
 
 func (s *ExecSuite) SetUpSuite(c *C) {
+	ctx := context.Background()
 	var err error
 	s.cli, err = NewClient()
 	c.Assert(err, IsNil)
@@ -44,7 +46,7 @@ func (s *ExecSuite) SetUpSuite(c *C) {
 			GenerateName: "exectest-",
 		},
 	}
-	ns, err = s.cli.CoreV1().Namespaces().Create(context.TODO(), ns, metav1.CreateOptions{})
+	ns, err = s.cli.CoreV1().Namespaces().Create(ctx, ns, metav1.CreateOptions{})
 	c.Assert(err, IsNil)
 	s.namespace = ns.Name
 	pod := &v1.Pod{
@@ -59,11 +61,11 @@ func (s *ExecSuite) SetUpSuite(c *C) {
 			},
 		},
 	}
-	s.pod, err = s.cli.CoreV1().Pods(s.namespace).Create(context.TODO(), pod, metav1.CreateOptions{})
+	s.pod, err = s.cli.CoreV1().Pods(s.namespace).Create(ctx, pod, metav1.CreateOptions{})
 	c.Assert(err, IsNil)
-	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
+	ctxTimeout, cancel := context.WithTimeout(ctx, 5*time.Minute)
 	defer cancel()
-	c.Assert(WaitForPodReady(ctx, s.cli, s.namespace, s.pod.Name), IsNil)
+	c.Assert(WaitForPodReady(ctxTimeout, s.cli, s.namespace, s.pod.Name), IsNil)
 	s.pod, err = s.cli.CoreV1().Pods(s.namespace).Get(ctx, s.pod.Name, metav1.GetOptions{})
 	c.Assert(err, IsNil)
 }
@@ -96,3 +98,45 @@ func (s *ExecSuite) TestExecEchoDefaultContainer(c *C) {
 	c.Assert(stdout, Equals, "badabing")
 	c.Assert(stderr, Equals, "")
 }
+
+func (s *ExecSuite) TestLSWithoutStdIn(c *C) {
+	cmd := []string{"ls", "-l", "/home"}
+	c.Assert(s.pod.Status.Phase, Equals, v1.PodRunning)
+	c.Assert(len(s.pod.Status.ContainerStatuses) > 0, Equals, true)
+	stdout, stderr, err := Exec(s.cli, s.pod.Namespace, s.pod.Name, "", cmd, nil)
+	c.Assert(err, IsNil)
+	c.Assert(stdout, Equals, "total 0")
+	c.Assert(stderr, Equals, "")
+}
+
+func (s *ExecSuite) TestKopiaCommand(c *C) {
+	ctx := context.Background()
+	pod := &v1.Pod{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "kopia-pod",
+			Namespace: s.namespace,
+		},
+		Spec: v1.PodSpec{
+			Containers: []v1.Container{
+				v1.Container{
+					Name:  "kanister-sidecar",
+					Image: "kanisterio/kanister-tools:0.37.0",
+				},
+			},
+		},
+	}
+	p, err := s.cli.CoreV1().Pods(s.namespace).Create(ctx, pod, metav1.CreateOptions{})
+	c.Assert(err, IsNil)
+	defer s.cli.CoreV1().Pods(s.namespace).Delete(ctx, pod.Name, metav1.DeleteOptions{}) // nolint: errcheck
+	ctxT, cancel := context.WithTimeout(ctx, 5*time.Minute)
+	defer cancel()
+	c.Assert(WaitForPodReady(ctxT, s.cli, s.namespace, p.Name), IsNil)
+	// up until now below is how we were used to run kopia commands
+	// "bash" "-c" "kopia repository create filesystem --path=$HOME/kopia_repo --password=newpass"
+	// but now we don't want `bash -c`
+	cmd := []string{"kopia", "repository", "create", "filesystem", "--path=$HOME/kopia_repo", "--password=newpass"}
+	stdout, stderr, err := Exec(s.cli, pod.Namespace, pod.Name, "", cmd, nil)
+	c.Assert(err, IsNil)
+	c.Assert(strings.Contains(stdout, "Policy for (global):"), Equals, true)
+	c.Assert(strings.Contains(stderr, "Initializing repository with:"), Equals, true)
+}