Remove Gitlab::Git::Repository#rugged and Gollum code

Cleanup code, and refactor tests that still use Rugged. After this, there should
be no Rugged code that access the instance's repositories on non-test
environments. There is still some rugged code for other tasks like the
repository import task, but since it doesn't access any repository storage path
it can stay.

7 files changed, 26 insertions, 113 deletions

diff --git a/lib/gitlab/git/commit.rb b/lib/gitlab/git/commit.rb
index 5b264868af0..74cdabfed9d 100644
--- a/lib/gitlab/git/commit.rb
+++ b/lib/gitlab/git/commit.rb
@@ -53,9 +53,6 @@ module Gitlab
           # Already a commit?
           return commit_id if commit_id.is_a?(Gitlab::Git::Commit)
 
-          # A rugged reference?
-          commit_id = Gitlab::Git::Ref.dereference_object(commit_id)
-
           # Some weird thing?
           return nil unless commit_id.is_a?(String)
 
@@ -127,8 +124,6 @@ module Gitlab
         #        :topo, or any combination of them (in an array). Commit ordering types
         #        are documented here:
         #        http://www.rubydoc.info/github/libgit2/rugged/Rugged#SORT_NONE-constant)
-        #
-        # Gitaly migration: https://gitlab.com/gitlab-org/gitaly/issues/326
         def find_all(repo, options = {})
           repo.wrapped_gitaly_errors do
             Gitlab::GitalyClient::CommitService.new(repo).find_all_commits(options)
@@ -328,7 +323,6 @@ module Gitlab
         entry = @repository.gitaly_commit_client.tree_entry(id, path, 1)
         return unless entry
 
-        # To be compatible with the rugged format
         entry = entry.to_h
         entry.delete(:data)
         entry[:name] = File.basename(path)
@@ -346,8 +340,8 @@ module Gitlab
           subject: message_split[0] ? message_split[0].chomp.b : "",
           body: raw_commit.message.b,
           parent_ids: raw_commit.parent_ids,
-          author: gitaly_commit_author_from_rugged(raw_commit.author),
-          committer: gitaly_commit_author_from_rugged(raw_commit.committer)
+          author: gitaly_commit_author_from_raw(raw_commit.author),
+          committer: gitaly_commit_author_from_raw(raw_commit.committer)
         )
       end
 
@@ -381,7 +375,7 @@ module Gitlab
         SERIALIZE_KEYS
       end
 
-      def gitaly_commit_author_from_rugged(author_or_committer)
+      def gitaly_commit_author_from_raw(author_or_committer)
         Gitaly::CommitAuthor.new(
           name: author_or_committer[:name].b,
           email: author_or_committer[:email].b,
diff --git a/lib/gitlab/git/ref.rb b/lib/gitlab/git/ref.rb
index fa71a4e7ea7..31a280155bd 100644
--- a/lib/gitlab/git/ref.rb
+++ b/lib/gitlab/git/ref.rb
@@ -1,5 +1,3 @@
-# Gitaly note: JV: probably no RPC's here (just one interaction with Rugged).
-
 module Gitlab
   module Git
     class Ref
@@ -26,13 +24,6 @@ module Gitlab
         str.gsub(%r{\Arefs/heads/}, '')
       end
 
-      # Gitaly: this method will probably be migrated indirectly via its call sites.
-      def self.dereference_object(object)
-        object = object.target while object.is_a?(Rugged::Tag::Annotation)
-
-        object
-      end
-
       def initialize(repository, name, target, dereferenced_target)
         @name = Gitlab::Git.ref_name(name)
         @dereferenced_target = dereferenced_target
diff --git a/lib/gitlab/git/repository.rb b/lib/gitlab/git/repository.rb
index 45d42c7078f..7732049b69b 100644
--- a/lib/gitlab/git/repository.rb
+++ b/lib/gitlab/git/repository.rb
@@ -9,14 +9,6 @@ module Gitlab
       include Gitlab::EncodingHelper
       include Gitlab::Utils::StrongMemoize
 
-      ALLOWED_OBJECT_DIRECTORIES_VARIABLES = %w[
-        GIT_OBJECT_DIRECTORY
-        GIT_ALTERNATE_OBJECT_DIRECTORIES
-      ].freeze
-      ALLOWED_OBJECT_RELATIVE_DIRECTORIES_VARIABLES = %w[
-        GIT_OBJECT_DIRECTORY_RELATIVE
-        GIT_ALTERNATE_OBJECT_DIRECTORIES_RELATIVE
-      ].freeze
       SEARCH_CONTEXT_LINES = 3
       REV_LIST_COMMIT_LIMIT = 2_000
       # In https://gitlab.com/gitlab-org/gitaly/merge_requests/698
@@ -104,15 +96,6 @@ module Gitlab
         raise Gitlab::Git::CommandError.new(e.message)
       end
 
-      # This method will be removed when Gitaly reaches v1.1.
-      def rugged
-        circuit_breaker.perform do
-          Rugged::Repository.new(path, alternates: alternate_object_directories)
-        end
-      rescue Rugged::RepositoryError, Rugged::OSError
-        raise NoRepository.new('no repository for such path')
-      end
-
       def circuit_breaker
         @circuit_breaker ||= Gitlab::Git::Storage::CircuitBreaker.for_storage(storage)
       end
@@ -638,20 +621,6 @@ module Gitlab
         end
       end
 
-      AUTOCRLF_VALUES = {
-        "true" => true,
-        "false" => false,
-        "input" => :input
-      }.freeze
-
-      def autocrlf
-        AUTOCRLF_VALUES[rugged.config['core.autocrlf']]
-      end
-
-      def autocrlf=(value)
-        rugged.config['core.autocrlf'] = AUTOCRLF_VALUES.invert[value]
-      end
-
       # Returns result like "git ls-files" , recursive and full file path
       #
       # Ex.
@@ -1024,14 +993,6 @@ module Gitlab
         found_module && found_module['url']
       end
 
-      def alternate_object_directories
-        relative_object_directories.map { |d| File.join(path, d) }
-      end
-
-      def relative_object_directories
-        Gitlab::Git::HookEnv.all(gl_repository).values_at(*ALLOWED_OBJECT_RELATIVE_DIRECTORIES_VARIABLES).flatten.compact
-      end
-
       # Returns true if the given ref name exists
       #
       # Ref names must start with `refs/`.
diff --git a/lib/gitlab/git/wiki.rb b/lib/gitlab/git/wiki.rb
index d2dc4f2e688..072019dfb0a 100644
--- a/lib/gitlab/git/wiki.rb
+++ b/lib/gitlab/git/wiki.rb
@@ -1,9 +1,16 @@
+# We only need Gollum::Page so let's not load all of gollum-lib.
+require 'gollum-lib/pagination'
+require 'gollum-lib/wiki'
+require 'gollum-lib/page'
+
 module Gitlab
   module Git
     class Wiki
       DuplicatePageError = Class.new(StandardError)
       OperationError = Class.new(StandardError)
 
+      DEFAULT_PAGINATION = Kaminari.config.default_per_page
+
       CommitDetails = Struct.new(:user_id, :username, :name, :email, :message) do
         def to_h
           { user_id: user_id, username: username, name: name, email: email, message: message }
@@ -74,7 +81,7 @@ module Gitlab
         # Gitaly uses gollum-lib to get the versions. Gollum defaults to 20
         # per page, but also fetches 20 if `limit` or `per_page` < 20.
         # Slicing returns an array with the expected number of items.
-        slice_bound = options[:limit] || options[:per_page] || Gollum::Page.per_page
+        slice_bound = options[:limit] || options[:per_page] || DEFAULT_PAGINATION
         versions[0..slice_bound]
       end
 
@@ -104,26 +111,6 @@ module Gitlab
 
       private
 
-      def new_page(gollum_page)
-        Gitlab::Git::WikiPage.new(gollum_page, new_version(gollum_page, gollum_page.version.id))
-      end
-
-      def new_version(gollum_page, commit_id)
-        Gitlab::Git::WikiPageVersion.new(version(commit_id), gollum_page&.format)
-      end
-
-      def version(commit_id)
-        commit_find_proc = -> { Gitlab::Git::Commit.find(@repository, commit_id) }
-
-        Gitlab::SafeRequestStore.fetch([:wiki_version_commit, commit_id]) { commit_find_proc.call }
-      end
-
-      def assert_type!(object, klass)
-        unless object.is_a?(klass)
-          raise ArgumentError, "expected a #{klass}, got #{object.inspect}"
-        end
-      end
-
       def gitaly_wiki_client
         @gitaly_wiki_client ||= Gitlab::GitalyClient::WikiService.new(@repository)
       end
diff --git a/lib/gitlab/git/wiki_file.rb b/lib/gitlab/git/wiki_file.rb
index 84335aca4bc..64313bb04e8 100644
--- a/lib/gitlab/git/wiki_file.rb
+++ b/lib/gitlab/git/wiki_file.rb
@@ -3,17 +3,12 @@ module Gitlab
     class WikiFile
       attr_reader :mime_type, :raw_data, :name, :path
 
-      # This class is meant to be serializable so that it can be constructed
-      # by Gitaly and sent over the network to GitLab.
-      #
-      # Because Gollum::File is not serializable we must get all the data from
-      # 'gollum_file' during initialization, and NOT store it in an instance
-      # variable.
-      def initialize(gollum_file)
-        @mime_type = gollum_file.mime_type
-        @raw_data = gollum_file.raw_data
-        @name = gollum_file.name
-        @path = gollum_file.path
+      # This class wraps Gitlab::GitalyClient::WikiFile
+      def initialize(gitaly_file)
+        @mime_type = gitaly_file.mime_type
+        @raw_data = gitaly_file.raw_data
+        @name = gitaly_file.name
+        @path = gitaly_file.path
       end
     end
   end
diff --git a/lib/gitlab/git/wiki_page.rb b/lib/gitlab/git/wiki_page.rb
index 669ae11a423..c4087c9ebdc 100644
--- a/lib/gitlab/git/wiki_page.rb
+++ b/lib/gitlab/git/wiki_page.rb
@@ -3,25 +3,15 @@ module Gitlab
     class WikiPage
       attr_reader :url_path, :title, :format, :path, :version, :raw_data, :name, :text_data, :historical, :formatted_data
 
-      # This class is meant to be serializable so that it can be constructed
-      # by Gitaly and sent over the network to GitLab.
-      #
-      # Because Gollum::Page is not serializable we must get all the data from
-      # 'gollum_page' during initialization, and NOT store it in an instance
-      # variable.
-      #
-      # Note that 'version' is a WikiPageVersion instance which it itself
-      # serializable. That means it's OK to store 'version' in an instance
-      # variable.
-      def initialize(gollum_page, version)
-        @url_path = gollum_page.url_path
-        @title = gollum_page.title
-        @format = gollum_page.format
-        @path = gollum_page.path
-        @raw_data = gollum_page.raw_data
-        @name = gollum_page.name
-        @historical = gollum_page.historical?
-        @formatted_data = gollum_page.formatted_data if gollum_page.is_a?(Gollum::Page)
+      # This class abstracts away Gitlab::GitalyClient::WikiPage
+      def initialize(gitaly_page, version)
+        @url_path = gitaly_page.url_path
+        @title = gitaly_page.title
+        @format = gitaly_page.format
+        @path = gitaly_page.path
+        @raw_data = gitaly_page.raw_data
+        @name = gitaly_page.name
+        @historical = gitaly_page.historical?
 
         @version = version
       end
diff --git a/lib/gitlab/git/wiki_page_version.rb b/lib/gitlab/git/wiki_page_version.rb
index 55f1afedcab..d5e7e70fd31 100644
--- a/lib/gitlab/git/wiki_page_version.rb
+++ b/lib/gitlab/git/wiki_page_version.rb
@@ -3,11 +3,6 @@ module Gitlab
     class WikiPageVersion
       attr_reader :commit, :format
 
-      # This class is meant to be serializable so that it can be constructed
-      # by Gitaly and sent over the network to GitLab.
-      #
-      # Both 'commit' (a Gitlab::Git::Commit) and 'format' (a string) are
-      # serializable.
       def initialize(commit, format)
         @commit = commit
         @format = format