[cain/restore] add user-group to specify files ownership

Author: maorfr

README.md

@@ -113,6 +113,7 @@ Flags:
   -l, --selector string     selector to filter on
       --src string          source to restore from. Example: s3://bucket/cassandra/namespace/cluster-name
   -t, --tag string          tag to restore
+      --user-group string   user and group who should own restored files (default "cassandra:cassandra")
 ```
 
 #### Examples

cmd/cain.go

@@ -108,6 +108,7 @@ type restoreCmd struct {
 	container  string
 	parallel   int
 	bufferSize float64
+	userGroup  string
 
 	out io.Writer
 }
@@ -146,6 +147,7 @@ func NewRestoreCmd(out io.Writer) *cobra.Command {
 				Container:  r.container,
 				Parallel:   r.parallel,
 				BufferSize: r.bufferSize,
+				UserGroup:  r.userGroup,
 			}
 			if err := cain.Restore(options); err != nil {
 				log.Fatal(err)
@@ -163,6 +165,7 @@ func NewRestoreCmd(out io.Writer) *cobra.Command {
 	f.StringVarP(&r.container, "container", "c", "cassandra", "container name to act on")
 	f.IntVarP(&r.parallel, "parallel", "p", 1, "number of files to copy in parallel. set this flag to 0 for full parallelism")
 	f.Float64VarP(&r.bufferSize, "buffer-size", "b", 6.75, "in memory buffer size (MB) to use for files copy (buffer per file)")
+	f.StringVar(&r.userGroup, "user-group", "cassandra:cassandra", "user and group who should own restored files")
 
 	return cmd
 }

pkg/cain/cain.go

@@ -79,6 +79,7 @@ type RestoreOptions struct {
 	Container  string
 	Parallel   int
 	BufferSize float64
+	UserGroup  string
 }
 
 // Restore performs restore
@@ -144,6 +145,11 @@ func Restore(o RestoreOptions) error {
 		return err
 	}
 
+	log.Println("Changing files ownership")
+	if err := utils.ChangeFilesOwnership(k8sClient, existingPods, o.Namespace, o.Container, o.UserGroup); err != nil {
+		return err
+	}
+
 	log.Println("Refreshing tables")
 	RefreshTables(k8sClient, o.Namespace, o.Container, o.Keyspace, podsToBeRestored, tablesToRefresh)
 

pkg/utils/path.go

@@ -144,3 +144,19 @@ func PathFromSrcToK8s(k8sClient interface{}, fromPath, cassandraDataDir, srcBase
 
 	return toPath, nil
 }
+
+// ChangeFilesOwnership changes the ownership of files after restoring them
+func ChangeFilesOwnership(iK8sClient interface{}, pods []string, namespace, container, userGroup string) error {
+	k8sClient := iK8sClient.(*skbn.K8sClient)
+	command := []string{"chown", "-R", userGroup, cassandraDataDir}
+	for _, pod := range pods {
+		stderr, err := skbn.Exec(*k8sClient, namespace, pod, container, command, nil, nil)
+		if len(stderr) != 0 {
+			return fmt.Errorf("STDERR: " + (string)(stderr))
+		}
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}