Add option to suppress archive commit sha

Repository archives are always named `<project>-<ref>-<sha>` even if
the ref is a commit. A consequence of always including the sha even
for tags is that packaging a release is more difficult because both
the ref and sha must be known by the packager.

- add append_sha option (defaults true) to provide a method for
toggling this feature.

Support added to GitLab Workhorse by gitlab-org/gitlab-workhorse!232

app/helpers/workhorse_helper.rb

@@ -24,8 +24,8 @@ module WorkhorseHelper
   end
   # Archive a Git repository and send it through Workhorse
-  def send_git_archive(repository, ref:, format:)
-    headers.store(*Gitlab::Workhorse.send_git_archive(repository, ref: ref, format: format))
+  def send_git_archive(repository, **kwargs)
+    headers.store(*Gitlab::Workhorse.send_git_archive(repository, **kwargs))
     head :ok
   end

lib/api/helpers.rb

@@ -489,8 +489,8 @@ module API
       header(*Gitlab::Workhorse.send_git_blob(repository, blob))
     end
-    def send_git_archive(repository, ref:, format:)
-      header(*Gitlab::Workhorse.send_git_archive(repository, ref: ref, format: format))
+    def send_git_archive(repository, **kwargs)
+      header(*Gitlab::Workhorse.send_git_archive(repository, **kwargs))
     end
     def send_artifacts_entry(build, entry)

lib/api/repositories.rb

@@ -88,7 +88,7 @@ module API
       end
       get ':id/repository/archive', requirements: { format: Gitlab::PathRegex.archive_formats_regex } do
         begin
-          send_git_archive user_project.repository, ref: params[:sha], format: params[:format]
+          send_git_archive user_project.repository, ref: params[:sha], format: params[:format], append_sha: true
         rescue
           not_found!('File')
         end

lib/api/v3/repositories.rb

@@ -75,7 +75,7 @@ module API
         end
         get ':id/repository/archive', requirements: { format: Gitlab::PathRegex.archive_formats_regex } do
           begin
-            send_git_archive user_project.repository, ref: params[:sha], format: params[:format]
+            send_git_archive user_project.repository, ref: params[:sha], format: params[:format], append_sha: true
           rescue
             not_found!('File')
           end

lib/gitlab/git/repository.rb

@@ -394,17 +394,24 @@ module Gitlab
         nil
       end
-      def archive_prefix(ref, sha)
+      def archive_prefix(ref, sha, append_sha:)
+        append_sha = (ref != sha) if append_sha.nil?
+
         project_name = self.name.chomp('.git')
-        "#{project_name}-#{ref.tr('/', '-')}-#{sha}"
+        formatted_ref = ref.tr('/', '-')
+
+        prefix_segments = [project_name, formatted_ref]
+        prefix_segments << sha if append_sha
+
+        prefix_segments.join('-')
       end
-      def archive_metadata(ref, storage_path, format = "tar.gz")
+      def archive_metadata(ref, storage_path, format = "tar.gz", append_sha: true)
         ref ||= root_ref
         commit = Gitlab::Git::Commit.find(self, ref)
         return {} if commit.nil?
-        prefix = archive_prefix(ref, commit.id)
+        prefix = archive_prefix(ref, commit.id, append_sha: append_sha)
         {
           'RepoPath' => path,

lib/gitlab/workhorse.rb

@@ -63,10 +63,10 @@ module Gitlab
         ]
       end
-      def send_git_archive(repository, ref:, format:)
+      def send_git_archive(repository, ref:, format:, append_sha: true)
         format ||= 'tar.gz'
         format.downcase!
-        params = repository.archive_metadata(ref, Gitlab.config.gitlab.repository_downloads_path, format)
+        params = repository.archive_metadata(ref, Gitlab.config.gitlab.repository_downloads_path, format, append_sha)
         raise "Repository or ref not found" if params.empty?
         if Gitlab::GitalyClient.feature_enabled?(:workhorse_archive, status: Gitlab::GitalyClient::MigrationStatus::OPT_OUT)

spec/lib/gitlab/git/repository_spec.rb

@@ -247,16 +247,22 @@ describe Gitlab::Git::Repository, seed_helper: true do
     end
     it 'returns parameterised string for a ref containing slashes' do
-      prefix = repository.archive_prefix('test/branch', 'SHA')
+      prefix = repository.archive_prefix('test/branch', 'SHA', append_sha: true)
       expect(prefix).to eq("#{project_name}-test-branch-SHA")
     end
     it 'returns correct string for a ref containing dots' do
-      prefix = repository.archive_prefix('test.branch', 'SHA')
+      prefix = repository.archive_prefix('test.branch', 'SHA', append_sha: true)
       expect(prefix).to eq("#{project_name}-test.branch-SHA")
     end
+
+    it 'returns string with sha when append_sha is false' do
+      prefix = repository.archive_prefix('test.branch', 'SHA', append_sha: false)
+
+      expect(prefix).to eq("#{project_name}-test.branch")
+    end
   end
   describe '#archive' do