logs commands: validate backup/restore exists & is finished processing

Signed-off-by: Steve Kriss <krisss@vmware.com>

changelogs/unreleased/1337-skriss

@@ -0,0 +1 @@
+velero backup logs & velero restore logs: show helpful error message if backup/restore does not exist or is not finished processing

pkg/cmd/cli/backup/logs.go

@@ -21,6 +21,8 @@ import (
 	"time"
 
 	"github.com/spf13/cobra"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
 	v1 "github.com/heptio/velero/pkg/apis/velero/v1"
 	"github.com/heptio/velero/pkg/client"
@@ -36,10 +38,24 @@ func NewLogsCommand(f client.Factory) *cobra.Command {
 		Short: "Get backup logs",
 		Args:  cobra.ExactArgs(1),
 		Run: func(c *cobra.Command, args []string) {
+			backupName := args[0]
+
 			veleroClient, err := f.Client()
 			cmd.CheckError(err)
 
-			err = downloadrequest.Stream(veleroClient.VeleroV1(), f.Namespace(), args[0], v1.DownloadTargetKindBackupLog, os.Stdout, timeout)
+			backup, err := veleroClient.VeleroV1().Backups(f.Namespace()).Get(backupName, metav1.GetOptions{})
+			if apierrors.IsNotFound(err) {
+				cmd.Exit("Backup %q does not exist.", backupName)
+			} else if err != nil {
+				cmd.Exit("Error checking for backup %q: %v", backupName, err)
+			}
+
+			if backup.Status.Phase != v1.BackupPhaseCompleted && backup.Status.Phase != v1.BackupPhaseFailed {
+				cmd.Exit("Logs for backup %q are not available until it's finished processing. Please wait "+
+					"until the backup has a phase of Completed or Failed and try again.", backupName)
+			}
+
+			err = downloadrequest.Stream(veleroClient.VeleroV1(), f.Namespace(), backupName, v1.DownloadTargetKindBackupLog, os.Stdout, timeout)
 			cmd.CheckError(err)
 		},
 	}

pkg/cmd/cli/restore/logs.go

@@ -20,15 +20,14 @@ import (
 	"os"
 	"time"
 
-	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
 	v1 "github.com/heptio/velero/pkg/apis/velero/v1"
 	"github.com/heptio/velero/pkg/client"
 	"github.com/heptio/velero/pkg/cmd"
 	"github.com/heptio/velero/pkg/cmd/util/downloadrequest"
-	veleroclient "github.com/heptio/velero/pkg/generated/clientset/versioned"
 )
 
 func NewLogsCommand(f client.Factory) *cobra.Command {
@@ -39,12 +38,24 @@ func NewLogsCommand(f client.Factory) *cobra.Command {
 		Short: "Get restore logs",
 		Args:  cobra.ExactArgs(1),
 		Run: func(c *cobra.Command, args []string) {
-			l := NewLogsOptions()
-			cmd.CheckError(l.Complete(args))
-			cmd.CheckError(l.Validate(f))
+			restoreName := args[0]
+
 			veleroClient, err := f.Client()
 			cmd.CheckError(err)
-			err = downloadrequest.Stream(veleroClient.VeleroV1(), f.Namespace(), args[0], v1.DownloadTargetKindRestoreLog, os.Stdout, timeout)
+
+			restore, err := veleroClient.VeleroV1().Restores(f.Namespace()).Get(restoreName, metav1.GetOptions{})
+			if apierrors.IsNotFound(err) {
+				cmd.Exit("Restore %q does not exist.", restoreName)
+			} else if err != nil {
+				cmd.Exit("Error checking for restore %q: %v", restoreName, err)
+			}
+
+			if restore.Status.Phase != v1.RestorePhaseCompleted && restore.Status.Phase != v1.RestorePhaseFailed {
+				cmd.Exit("Logs for restore %q are not available until it's finished processing. Please wait "+
+					"until the restore has a phase of Completed or Failed and try again.", restoreName)
+			}
+
+			err = downloadrequest.Stream(veleroClient.VeleroV1(), f.Namespace(), restoreName, v1.DownloadTargetKindRestoreLog, os.Stdout, timeout)
 			cmd.CheckError(err)
 		},
 	}
@@ -53,41 +64,3 @@ func NewLogsCommand(f client.Factory) *cobra.Command {
 
 	return c
 }
-
-// LogsOptions contains the fields required to retrieve logs of a restore
-type LogsOptions struct {
-	RestoreName string
-
-	client veleroclient.Interface
-}
-
-// NewLogsOptions returns a new instance of LogsOptions
-func NewLogsOptions() *LogsOptions {
-	return &LogsOptions{}
-}
-
-// Complete fills in LogsOptions with the given parameters, like populating the
-// restore name from the input args
-func (l *LogsOptions) Complete(args []string) error {
-	l.RestoreName = args[0]
-	return nil
-}
-
-// Validate validates the LogsOptions against the cluster, like validating if
-// the given restore exists in the cluster or not
-func (l *LogsOptions) Validate(f client.Factory) error {
-	c, err := f.Client()
-	if err != nil {
-		return err
-	}
-	l.client = c
-
-	r, err := l.client.VeleroV1().Restores(f.Namespace()).Get(l.RestoreName, metav1.GetOptions{})
-	if err != nil {
-		return err
-	}
-	if r.Status.Phase != v1.RestorePhaseCompleted {
-		return errors.Errorf("unable to retrieve logs because restore is not complete")
-	}
-	return nil
-}

pkg/cmd/errors.go

@@ -32,3 +32,9 @@ func CheckError(err error) {
 		os.Exit(1)
 	}
 }
+
+// Exit prints msg (with optional args), plus a newline, to stderr and exits with code 1.
+func Exit(msg string, args ...interface{}) {
+	fmt.Fprintf(os.Stderr, msg+"\n", args...)
+	os.Exit(1)
+}