Fix edge case of children for images that are FROM a SharedTag

cmd/bashbrew/cmd-deps.go

@@ -100,63 +100,75 @@ func cmdFamily(parents bool, c *cli.Context) error {
 	// now the real work
 	seen := map[string]bool{}
 	for _, repo := range depsRepos {
-		r, err := fetch(repo)
-		if err != nil {
-			return cli.NewMultiError(fmt.Errorf(`failed fetching repo %q`, repo), err)
-		}
+		tagsToConsider := []string{}
 
-		for _, entry := range r.Entries() {
-			if applyConstraints && r.SkipConstraints(entry) {
-				continue
+		if r, err := fetch(repo); err == nil {
+			// fetch succeeded, must be an object we know about so let's do a proper listing/search
+			for _, entry := range r.Entries() {
+				if applyConstraints && r.SkipConstraints(entry) {
+					continue
+				}
+				if archFilter && !entry.HasArchitecture(arch) {
+					continue
+				}
+
+				if len(r.TagEntries) == 1 {
+					// we can't include SharedTags here or else they'll make "bashbrew parents something:simple" show the parents of the shared tags too ("nats:scratch" leading to both "nats:alpine" *and* "nats:windowsservercore" instead of just "nats:alpine" like it should), so we have to reimplement bits of "r.Tags" to exclude them
+					tagRepo := path.Join(namespace, r.RepoName)
+					for _, rawTag := range entry.Tags {
+						tag := tagRepo + ":" + rawTag
+						tagsToConsider = append(tagsToConsider, tag)
+					}
+				} else {
+					// if we're doing something like "bashbrew children full-repo" (or "bashbrew children full-repo:shared-tag"), we *need* to include the SharedTags or else things that are "FROM full-repo:shared-tag" won't show up 😅 ("bashbrew children adoptopenjdk" was just "cassandra" instead of the full list)
+					tagsToConsider = append(tagsToConsider, r.Tags(namespace, false, entry)...)
+				}
 			}
-			if archFilter && !entry.HasArchitecture(arch) {
-				continue
+		} else {
+			if err != nil {
+				return cli.NewMultiError(fmt.Errorf(`failed fetching repo %q`, repo), err)
 			}
+		}
 
-			// we can't include SharedTags here or else they'll make "bashbrew parents something:simple" show the parents of the shared tags too ("nats:scratch" leading to both "nats:alpine" *and* "nats:windowsservercore" instead of just "nats:alpine" like it should), so we have to reimplement bits of "r.Tags" to exclude them
-			tagRepo := path.Join(namespace, r.RepoName)
-			for _, rawTag := range entry.Tags {
-				tag := tagRepo + ":" + rawTag
-
-				nodes := []topsortDepthNodes{}
-				if parents {
-					nodes = append(nodes, topsortDepthNodes{
-						depth: 1,
-						nodes: network.Get(tag).InboundEdges,
-					})
-				} else {
-					nodes = append(nodes, topsortDepthNodes{
-						depth: 1,
-						nodes: network.Get(tag).OutboundEdges,
-					})
+		for _, tag := range tagsToConsider {
+			nodes := []topsortDepthNodes{}
+			if parents {
+				nodes = append(nodes, topsortDepthNodes{
+					depth: 1,
+					nodes: network.Get(tag).InboundEdges,
+				})
+			} else {
+				nodes = append(nodes, topsortDepthNodes{
+					depth: 1,
+					nodes: network.Get(tag).OutboundEdges,
+				})
+			}
+			for len(nodes) > 0 {
+				depthNodes := nodes[0]
+				nodes = nodes[1:]
+				if depth > 0 && depthNodes.depth > depth {
+					continue
 				}
-				for len(nodes) > 0 {
-					depthNodes := nodes[0]
-					nodes = nodes[1:]
-					if depth > 0 && depthNodes.depth > depth {
+				for _, node := range depthNodes.nodes {
+					seenKey := node.Name
+					if uniq {
+						seenKey = seenKey[:strings.Index(seenKey, ":")+1] + node.Value.(*manifest.Manifest2822Entry).Tags[0]
+					}
+					if seen[seenKey] {
 						continue
 					}
-					for _, node := range depthNodes.nodes {
-						seenKey := node.Name
-						if uniq {
-							seenKey = seenKey[:strings.Index(seenKey, ":")+1] + node.Value.(*manifest.Manifest2822Entry).Tags[0]
-						}
-						if seen[seenKey] {
-							continue
-						}
-						seen[seenKey] = true
-						fmt.Printf("%s\n", seenKey)
-						if parents {
-							nodes = append(nodes, topsortDepthNodes{
-								depth: depthNodes.depth + 1,
-								nodes: node.InboundEdges,
-							})
-						} else {
-							nodes = append(nodes, topsortDepthNodes{
-								depth: depthNodes.depth + 1,
-								nodes: node.OutboundEdges,
-							})
-						}
+					seen[seenKey] = true
+					fmt.Printf("%s\n", seenKey)
+					if parents {
+						nodes = append(nodes, topsortDepthNodes{
+							depth: depthNodes.depth + 1,
+							nodes: node.InboundEdges,
+						})
+					} else {
+						nodes = append(nodes, topsortDepthNodes{
+							depth: depthNodes.depth + 1,
+							nodes: node.OutboundEdges,
+						})
 					}
 				}
 			}