Minor amendments for the tag info page to account the cache type of sub-image.

CHANGELOG.md

@@ -1,5 +1,9 @@
 ## Changelog
 
+### 0.9.1 (2020-02-20)
+
+* Minor amendments for the tag info page to account the cache type of sub-image.
+
 ### 0.9.0 (2020-02-19)
 
 * Upgrade Go version to 1.13.7, alpine to 3.11 and other dependencies.

README.md

@@ -119,7 +119,7 @@ Docker image formats and their confusing combinations as supported by this UI:
 * Manifest v2 schema 1 + Manifest v2 schema 2: current format of a single image, the image history are coming from schema 1, should be referenced by repo:tag name.
 * Manifest v2 schema 1 + Manifest List v2 schema 2: multi-arch image format containing digests of sub-images, the image history are coming from schema 1 (no idea from what sub-image it was picked up when created), should be referenced by repo:tag name.
 * Manifest v2 schema 2: current image format referenced by its digest sha256, no image history.
-* Manifest List v2 schema 2: multi-arch image format referenced by its digest sha256, no image history.
+* Manifest List v2 schema 2: multi-arch image referenced by its digest sha256 or cache image referenced by tag name, no image history.
 
 ### Screenshots
 

main.go

@@ -263,21 +263,26 @@ func (a *apiClient) viewTagInfo(c echo.Context) error {
 		layersCount = len(gjson.Get(infoV1, "fsLayers").Array())
 	}
 
-	// Gather sub-image info of multi-arch image
+	// Gather sub-image info of multi-arch or cache image
 	var digestList []map[string]interface{}
 	for _, s := range manifests {
 		r, _ := gjson.Parse(s.String()).Value().(map[string]interface{})
 		if s.Get("mediaType").String() == "application/vnd.docker.distribution.manifest.v2+json" {
+			// Sub-image of the specific arch.
 			_, dInfoV1, _ := a.client.TagInfo(repoPath, s.Get("digest").String(), true)
 			var dSize int64
 			for _, d := range gjson.Get(dInfoV1, "layers.#.size").Array() {
 				dSize = dSize + d.Int()
 			}
 			r["size"] = dSize
+			// Create link here because there is a bug with jet template when referencing a value by map key in the "if" condition under "range".
+			if r["mediaType"] == "application/vnd.docker.distribution.manifest.v2+json" {
+				r["digest"] = fmt.Sprintf(`<a href="%s/%s/%s/%s">%s</a>`, a.config.BasePath, namespace, repo, r["digest"], r["digest"])
+			}
 		} else {
+			// Sub-image of the cache type.
 			r["size"] = s.Get("size").Int()
 		}
-		delete(r, "mediaType")
 		r["ordered_keys"] = registry.SortedMapKeys(r)
 		digestList = append(digestList, r)
 	}

templates/tag_info.html

@@ -20,12 +20,12 @@
         </tr>
     </thead>
     <tr>
-        <td width="20%"><b>Image URL</b></td><td>{{ registryHost }}/{{ repoPath }}{{if isDigest}}@{{else}}:{{end}}{{ tag }}</td>
+        <td width="20%"><b>Image URL</b></td><td>{{ registryHost }}/{{ repoPath }}{{ isDigest ? "@" : ":" }}{{ tag }}</td>
     </tr>
     <tr>
         <td><b>Digest</b></td><td>sha256:{{ sha256 }}</td>
     </tr>
-    {{if not isDigest}}
+    {{if created}}
     <tr>
         <td><b>Created On</b></td><td>{{ created|pretty_time }}</td>
     </tr>
@@ -48,7 +48,7 @@
 </table>
 
 {{if digestList}}
-<h4>Multi-arch Sub-images <!-- Manifest List v2 schema 2 --></h4>
+<h4>Sub-images <!-- Manifest List v2 schema 2: multi-arch or cache image --></h4>
 {{range index, manifest := digestList}}
 <table class="table table-striped table-bordered">
     <thead bgcolor="#ddd">
@@ -68,10 +68,8 @@
         </td>
         {{else if key == "size"}}
         <td>{{ manifest[key]|pretty_size }}</td>
-        {{else if key == "digest"}}
-        <td><a href="{{ basePath }}/{{ namespace }}/{{ repo }}/{{ manifest["digest"] }}">{{ manifest["digest"] }}</a></td>
         {{else}}
-        <td>{{ manifest[key] }}</td>
+        <td>{{ manifest[key]|raw }}</td>
         {{end}}
     </tr>
     {{end}}

version.go

@@ -1,3 +1,3 @@
 package main
 
-const version = "0.9.0"
+const version = "0.9.1"