CatalogJob: update the digests of tags

Enable the CatalogJob to update the digest of existing tags.

Resolves #828

Signed-off-by: Thomas Hipp <thipp@suse.de>

app/models/repository.rb

@@ -193,11 +193,38 @@ def self.create_or_update!(repo)
     repository = Repository.find_or_create_by!(name: name, namespace: namespace)
     tags = repository.tags.pluck(:name)
 
-    to_be_created_tags = repo["tags"] - tags
     to_be_deleted_tags = tags - repo["tags"]
 
     client = Registry.get.client
-    to_be_created_tags.each do |tag|
+
+    update_tags client, repository, repo["tags"] & tags
+    create_tags client, repository, portus, repo["tags"] - tags
+
+    # Finally remove the tags that are left and return the repo.
+    repository.tags.where(name: to_be_deleted_tags).find_each { |t| t.delete_and_update!(portus) }
+    repository.reload
+  end
+
+  # Update digest of already existing tags.
+  def self.update_tags(client, repository, tags)
+    tags.each do |tag|
+      # Try to fetch the manifest digest of the tag.
+      begin
+        _, digest, = client.manifest(repository.full_name, tag)
+      rescue StandardError => e
+        logger.tagged("catalog") do
+          logger.warn "Could not fetch manifest for '#{repository.full_name}' " \
+            "with tag '#{tag}': " + e.message
+        end
+        next
+      end
+      repository.tags.find_by(name: tag).update!(digest: digest)
+    end
+  end
+
+  # Create new tags.
+  def self.create_tags(client, repository, author, tags)
+    tags.each do |tag|
       # Try to fetch the manifest digest of the tag.
       begin
         id, digest, = client.manifest(repository.full_name, tag)
@@ -206,12 +233,8 @@ def self.create_or_update!(repo)
         digest = ""
       end
 
-      Tag.create!(name: tag, repository: repository, author: portus, digest: digest, image_id: id)
+      Tag.create!(name: tag, repository: repository, author: author, digest: digest, image_id: id)
       logger.tagged("catalog") { logger.info "Created the tag '#{tag}'." }
     end
-
-    # Finally remove the tags that are left and return the repo.
-    repository.tags.where(name: to_be_deleted_tags).find_each { |t| t.delete_and_update!(portus) }
-    repository.reload
   end
 end

spec/models/repository_spec.rb

@@ -419,7 +419,7 @@ def get_url(repo, tag)
     let!(:namespace)   { create(:namespace, team: team) }
     let!(:repo1)       { create(:repository, name: "repo1", namespace: namespace) }
     let!(:repo2)       { create(:repository, name: "repo2", namespace: namespace) }
-    let!(:tag1)        { create(:tag, name: "tag1", repository: repo1) }
+    let!(:tag1)        { create(:tag, name: "tag1", repository: repo1, digest: "foo") }
     let!(:tag2)        { create(:tag, name: "tag2", repository: repo2) }
     let!(:tag3)        { create(:tag, name: "tag3", repository: repo2) }
 
@@ -432,7 +432,7 @@ def get_url(repo, tag)
         if args.first != "busybox" && !args.first.include?("/")
           raise "Should be included inside of a namespace"
         end
-        if args.last != "latest" && args.last != "0.1"
+        if args.last != "latest" && args.last != "0.1" && args.last != "tag1"
           raise "Using an unknown tag"
         end
 
@@ -443,6 +443,12 @@ def get_url(repo, tag)
     end
 
     it "adds and deletes tags accordingly" do
+      # Update existing tag's digest
+      repo = { "name" => "#{namespace.name}/repo1", "tags" => ["tag1"] }
+      repo = Repository.create_or_update!(repo)
+      expect(repo.id).to eq repo1.id
+      expect(repo.tags.find_by(name: "tag1").digest).to match("digest")
+
       # Removes the existing tag and adds two.
       repo = { "name" => "#{namespace.name}/repo1", "tags" => ["latest", "0.1"] }
       repo = Repository.create_or_update!(repo)