odo logs: Do not panic when no access to cluster/podman (#6561)

* odo logs: Do not panic when no access to cluster/podman

* Integration tests

* Remove unnecessary code

* Use defined errors

pkg/odo/cli/logs/logs.go

@@ -13,12 +13,15 @@ import (
 
 	"github.com/fatih/color"
 
+	"github.com/redhat-developer/odo/pkg/kclient"
 	odolabels "github.com/redhat-developer/odo/pkg/labels"
+	"github.com/redhat-developer/odo/pkg/podman"
 
 	"github.com/redhat-developer/odo/pkg/log"
 
 	"github.com/redhat-developer/odo/pkg/devfile/location"
 	"github.com/redhat-developer/odo/pkg/odo/commonflags"
+	fcontext "github.com/redhat-developer/odo/pkg/odo/commonflags/context"
 	"github.com/redhat-developer/odo/pkg/odo/util"
 	odoutil "github.com/redhat-developer/odo/pkg/odo/util"
 
@@ -89,6 +92,18 @@ func (o *LogsOptions) Complete(ctx context.Context, cmdline cmdline.Cmdline, _ [
 }
 
 func (o *LogsOptions) Validate(ctx context.Context) error {
+
+	switch fcontext.GetPlatform(ctx, commonflags.PlatformCluster) {
+	case commonflags.PlatformCluster:
+		if o.clientset.KubernetesClient == nil {
+			return kclient.NewNoConnectionError()
+		}
+	case commonflags.PlatformPodman:
+		if o.clientset.PodmanClient == nil {
+			return podman.NewPodmanNotFoundError(nil)
+		}
+	}
+
 	if o.devMode && o.deployMode {
 		return errors.New("pass only one of --dev or --deploy flags; pass no flag to see logs for both modes")
 	}

tests/integration/cmd_logs_test.go

@@ -1,6 +1,7 @@
 package integration
 
 import (
+	"os"
 	"path/filepath"
 	"strings"
 	"time"
@@ -54,6 +55,29 @@ var _ = Describe("odo logs command tests", func() {
 		helper.CommonAfterEach(commonVar)
 	})
 
+	When("in a devfile directory", func() {
+		BeforeEach(func() {
+			helper.CopyExample(filepath.Join("source", "nodejs"), commonVar.Context)
+			helper.Cmd("odo", "init", "--name", componentName, "--devfile-path", helper.GetExamplePath("source", "devfiles", "nodejs", "devfile.yaml")).ShouldPass()
+		})
+		When("not connected to any cluster or podman", Label(helper.LabelNoCluster), func() {
+			It("odo logs should fail with an error message", func() {
+				cmd := helper.Cmd("odo", "logs")
+				stderr := cmd.ShouldFail().Err()
+				Expect(stderr).To(ContainSubstring("unable to access the cluster"))
+			})
+
+			It("odo logs --platform podman should fail with an error message", func() {
+				os.Setenv("PODMAN_CMD", "false")
+				defer os.Unsetenv("PODMAN_CMD")
+				cmd := getLogCommand(true)
+				stderr := cmd.ShouldFail().Err()
+				Expect(stderr).To(ContainSubstring("unable to access podman"))
+			})
+		})
+
+	})
+
 	for _, podman := range []bool{false, true} {
 		podman := podman
 		When("directory is empty", helper.LabelPodmanIf(podman, func() {