diff --git a/lib/gitlab/git/commit.rb b/lib/gitlab/git/commit.rb
index 8ab3b0498ff..d0f04d25db2 100644
--- a/lib/gitlab/git/commit.rb
+++ b/lib/gitlab/git/commit.rb
@@ -38,7 +38,7 @@ module Gitlab
           repo = options.delete(:repo)
           raise 'Gitlab::Git::Repository is required' unless repo.respond_to?(:log)
 
-          repo.log(options).map { |c| decorate(c) }
+          repo.log(options)
         end
 
         # Get single commit
diff --git a/lib/gitlab/git/repository.rb b/lib/gitlab/git/repository.rb
index bd9993f275d..32a462ee7dd 100644
--- a/lib/gitlab/git/repository.rb
+++ b/lib/gitlab/git/repository.rb
@@ -331,83 +331,7 @@ module Gitlab
       #   )
       #
       def log(options)
-        default_options = {
-          limit: 10,
-          offset: 0,
-          path: nil,
-          follow: false,
-          skip_merges: false,
-          disable_walk: false,
-          after: nil,
-          before: nil
-        }
-
-        options = default_options.merge(options)
-        options[:limit] ||= 0
-        options[:offset] ||= 0
-        actual_ref = options[:ref] || root_ref
-        begin
-          sha = sha_from_ref(actual_ref)
-        rescue Rugged::OdbError, Rugged::InvalidError, Rugged::ReferenceError
-          # Return an empty array if the ref wasn't found
-          return []
-        end
-
-        if log_using_shell?(options)
-          log_by_shell(sha, options)
-        else
-          log_by_walk(sha, options)
-        end
-      end
-
-      def log_using_shell?(options)
-        options[:path].present? ||
-          options[:disable_walk] ||
-          options[:skip_merges] ||
-          options[:after] ||
-          options[:before]
-      end
-
-      def log_by_walk(sha, options)
-        walk_options = {
-          show: sha,
-          sort: Rugged::SORT_NONE,
-          limit: options[:limit],
-          offset: options[:offset]
-        }
-        Rugged::Walker.walk(rugged, walk_options).to_a
-      end
-
-      def log_by_shell(sha, options)
-        limit = options[:limit].to_i
-        offset = options[:offset].to_i
-        use_follow_flag = options[:follow] && options[:path].present?
-
-        # We will perform the offset in Ruby because --follow doesn't play well with --skip.
-        # See: https://gitlab.com/gitlab-org/gitlab-ce/issues/3574#note_3040520
-        offset_in_ruby = use_follow_flag && options[:offset].present?
-        limit += offset if offset_in_ruby
-
-        cmd = %W[#{Gitlab.config.git.bin_path} --git-dir=#{path} log]
-        cmd << "--max-count=#{limit}"
-        cmd << '--format=%H'
-        cmd << "--skip=#{offset}" unless offset_in_ruby
-        cmd << '--follow' if use_follow_flag
-        cmd << '--no-merges' if options[:skip_merges]
-        cmd << "--after=#{options[:after].iso8601}" if options[:after]
-        cmd << "--before=#{options[:before].iso8601}" if options[:before]
-        cmd << sha
-
-        # :path can be a string or an array of strings
-        if options[:path].present?
-          cmd << '--'
-          cmd += Array(options[:path])
-        end
-
-        raw_output = IO.popen(cmd) { |io| io.read }
-        lines = offset_in_ruby ? raw_output.lines.drop(offset) : raw_output.lines
-
-        lines.map! { |c| Rugged::Commit.new(rugged, c.strip) }
+        raw_log(options).map { |c| Commit.decorate(c) }
       end
 
       def count_commits(options)
@@ -912,6 +836,86 @@ module Gitlab
 
       private
 
+      def raw_log(options)
+        default_options = {
+          limit: 10,
+          offset: 0,
+          path: nil,
+          follow: false,
+          skip_merges: false,
+          disable_walk: false,
+          after: nil,
+          before: nil
+        }
+
+        options = default_options.merge(options)
+        options[:limit] ||= 0
+        options[:offset] ||= 0
+        actual_ref = options[:ref] || root_ref
+        begin
+          sha = sha_from_ref(actual_ref)
+        rescue Rugged::OdbError, Rugged::InvalidError, Rugged::ReferenceError
+          # Return an empty array if the ref wasn't found
+          return []
+        end
+
+        if log_using_shell?(options)
+          log_by_shell(sha, options)
+        else
+          log_by_walk(sha, options)
+        end
+      end
+
+      def log_using_shell?(options)
+        options[:path].present? ||
+          options[:disable_walk] ||
+          options[:skip_merges] ||
+          options[:after] ||
+          options[:before]
+      end
+
+      def log_by_walk(sha, options)
+        walk_options = {
+          show: sha,
+          sort: Rugged::SORT_NONE,
+          limit: options[:limit],
+          offset: options[:offset]
+        }
+        Rugged::Walker.walk(rugged, walk_options).to_a
+      end
+
+      def log_by_shell(sha, options)
+        limit = options[:limit].to_i
+        offset = options[:offset].to_i
+        use_follow_flag = options[:follow] && options[:path].present?
+
+        # We will perform the offset in Ruby because --follow doesn't play well with --skip.
+        # See: https://gitlab.com/gitlab-org/gitlab-ce/issues/3574#note_3040520
+        offset_in_ruby = use_follow_flag && options[:offset].present?
+        limit += offset if offset_in_ruby
+
+        cmd = %W[#{Gitlab.config.git.bin_path} --git-dir=#{path} log]
+        cmd << "--max-count=#{limit}"
+        cmd << '--format=%H'
+        cmd << "--skip=#{offset}" unless offset_in_ruby
+        cmd << '--follow' if use_follow_flag
+        cmd << '--no-merges' if options[:skip_merges]
+        cmd << "--after=#{options[:after].iso8601}" if options[:after]
+        cmd << "--before=#{options[:before].iso8601}" if options[:before]
+        cmd << sha
+
+        # :path can be a string or an array of strings
+        if options[:path].present?
+          cmd << '--'
+          cmd += Array(options[:path])
+        end
+
+        raw_output = IO.popen(cmd) { |io| io.read }
+        lines = offset_in_ruby ? raw_output.lines.drop(offset) : raw_output.lines
+
+        lines.map! { |c| Rugged::Commit.new(rugged, c.strip) }
+      end
+
       # We are trying to deprecate this method because it does a lot of work
       # but it seems to be used only to look up submodule URL's.
       # https://gitlab.com/gitlab-org/gitaly/issues/329
diff --git a/spec/lib/gitlab/git/repository_spec.rb b/spec/lib/gitlab/git/repository_spec.rb
index acffd335e43..10fa5f4044b 100644
--- a/spec/lib/gitlab/git/repository_spec.rb
+++ b/spec/lib/gitlab/git/repository_spec.rb
@@ -705,9 +705,9 @@ describe Gitlab::Git::Repository, seed_helper: true do
       # Add new commits so that there's a renamed file in the commit history
       repo = Gitlab::Git::Repository.new('default', TEST_REPO_PATH).rugged
 
-      commit_with_old_name = new_commit_edit_old_file(repo)
-      rename_commit = new_commit_move_file(repo)
-      commit_with_new_name = new_commit_edit_new_file(repo)
+      commit_with_old_name = Gitlab::Git::Commit.decorate(new_commit_edit_old_file(repo))
+      rename_commit = Gitlab::Git::Commit.decorate(new_commit_move_file(repo))
+      commit_with_new_name = Gitlab::Git::Commit.decorate(new_commit_edit_new_file(repo))
     end
 
     after(:context) do
@@ -880,8 +880,8 @@ describe Gitlab::Git::Repository, seed_helper: true do
 
     context "compare results between log_by_walk and log_by_shell" do
       let(:options) { { ref: "master" } }
-      let(:commits_by_walk) { repository.log(options).map(&:oid) }
-      let(:commits_by_shell) { repository.log(options.merge({ disable_walk: true })).map(&:oid) }
+      let(:commits_by_walk) { repository.log(options).map(&:id) }
+      let(:commits_by_shell) { repository.log(options.merge({ disable_walk: true })).map(&:id) }
 
       it { expect(commits_by_walk).to eq(commits_by_shell) }
 
@@ -924,7 +924,7 @@ describe Gitlab::Git::Repository, seed_helper: true do
 
         expect(commits.size).to be > 0
         expect(commits).to satisfy do |commits|
-          commits.all? { |commit| commit.time >= options[:after] }
+          commits.all? { |commit| commit.committed_date >= options[:after] }
         end
       end
     end
@@ -937,7 +937,7 @@ describe Gitlab::Git::Repository, seed_helper: true do
 
         expect(commits.size).to be > 0
         expect(commits).to satisfy do |commits|
-          commits.all? { |commit| commit.time <= options[:before] }
+          commits.all? { |commit| commit.committed_date <= options[:before] }
         end
       end
     end
@@ -946,7 +946,7 @@ describe Gitlab::Git::Repository, seed_helper: true do
       let(:options) { { ref: 'master', path: ['PROCESS.md', 'README.md'] } }
 
       def commit_files(commit)
-        commit.diff(commit.parent_ids.first).deltas.flat_map do |delta|
+        commit.diff_from_parent.deltas.flat_map do |delta|
           [delta.old_file[:path], delta.new_file[:path]].uniq.compact
         end
       end