Add an aliases subcommand to tags. (#96)

sonar/cmd/tags_aliases.go

@@ -0,0 +1,51 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/felicianotech/sonar/sonar/docker"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	tagsAliasCmd = &cobra.Command{
+		Use:   "aliases <full-image-name>",
+		Short: "Display tags that point to the same image the given tag does",
+		Args:  cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+
+			img, err := docker.ParseImageRef(args[0])
+			if err != nil {
+				return fmt.Errorf("Failed parsing image name: %s", err)
+			}
+
+			dockerTags, err := docker.GetAllTags(img.Namespace + "/" + img.Name)
+
+			var theDigest string
+
+			for _, tag := range dockerTags {
+
+				if tag.Name == img.Tag {
+					theDigest = tag.Digest
+					break
+				}
+			}
+
+			fmt.Printf("Listing aliases for the tag %s: \n\n", img.Tag)
+
+			for _, tag := range dockerTags {
+
+				if tag.Digest == theDigest && tag.Name != img.Tag {
+					fmt.Println(tag.Name)
+				}
+			}
+
+			return nil
+		},
+	}
+)
+
+func init() {
+	tagsCmd.AddCommand(tagsAliasCmd)
+}

sonar/docker/tag.go

@@ -7,9 +7,10 @@ import (
 )
 
 type Tag struct {
-	Name string
-	Size uint64
-	Date time.Time
+	Name   string
+	Size   uint64
+	Date   time.Time
+	Digest string
 }
 
 func GetAllTags(image string) ([]Tag, error) {
@@ -41,6 +42,8 @@ func GetAllTags(image string) ([]Tag, error) {
 			aTag.Name = v.(map[string]interface{})["name"].(string)
 			aTag.Size = uint64(v.(map[string]interface{})["full_size"].(float64))
 			aTag.Date, err = time.Parse(time.RFC3339, v.(map[string]interface{})["last_updated"].(string))
+			anImage := v.(map[string]interface{})["images"].([]interface{})[0]
+			aTag.Digest = anImage.(map[string]interface{})["digest"].(string)
 			if err != nil {
 				return nil, err
 			}