WIP: abra recipe upgrade on the way

catalogue/catalogue.go

@@ -219,3 +219,27 @@ func readAppsCatalogueWeb(target interface{}) error {
 
 	return nil
 }
+
+func VersionsOfService(recipe, serviceName string) ([]string, error) {
+	catl, err := ReadAppsCatalogue()
+	if err != nil {
+		return nil, err
+	}
+
+	app, ok := catl[recipe]
+	if !ok {
+		return nil, fmt.Errorf("recipe '%s' does not exist?", recipe)
+	}
+
+	versions := []string{}
+	alreadySeen := make(map[string]bool)
+	for version := range app.Versions {
+		appVersion := app.Versions[version][serviceName].Tag
+		if _, ok := alreadySeen[appVersion]; !ok {
+			alreadySeen[appVersion] = true
+			versions = append(versions, appVersion)
+		}
+	}
+
+	return versions, nil
+}

cli/recipe/recipe.go

@@ -158,7 +158,32 @@ var recipeUpgradeCommand = &cli.Command{
 		if recipe == "" {
 			internal.ShowSubcommandHelpAndError(c, errors.New("no recipe provided"))
 		}
-		// TODO: part 1 of https://git.coopcloud.tech/coop-cloud/go-abra/issues/39#issuecomment-8066
+
+		type existingTags struct {
+			AppCatalogueTags map[string]string
+			RegistryTags     map[string]string
+			RecipeSkipTags   map[string]string
+		}
+
+		pattern := fmt.Sprintf("%s/%s/compose**yml", config.APPS_DIR, recipe)
+		composeFiles, err := filepath.Glob(pattern)
+		if err != nil {
+			logrus.Fatal(err)
+		}
+
+		opts := options.Deploy{Composefiles: composeFiles}
+		compose, err := loader.LoadComposefile(opts)
+		if err != nil {
+			logrus.Fatal(err)
+		}
+
+		for _, service := range compose.Services {
+			_, err := catalogue.VersionsOfService(recipe, service.Name)
+			if err != nil {
+				logrus.Fatal(err)
+			}
+		}
+		// TODO
 		return nil
 	},
 }

client/registry.go

@@ -0,0 +1,19 @@
+package client
+
+import (
+	"github.com/docker/distribution/reference"
+)
+
+type Tag struct {
+	Layer string
+	Name  string
+}
+
+type Tags []Tag
+
+var registryURL = "https://registry.hub.docker.com/v1/repositories/%s/tags"
+
+func ReadRegistryTags(image reference.Named, target interface{}) ([]string, error) {
+	// tagsUrl := fmt.Sprintf(registryURL, image.Name())
+	return nil, nil
+}