diff --git a/GITALY_SERVER_VERSION b/GITALY_SERVER_VERSION
index 62df9f538d8..4a7076db09a 100644
--- a/GITALY_SERVER_VERSION
+++ b/GITALY_SERVER_VERSION
@@ -1 +1 @@
-0.76.0
+0.77.0
diff --git a/lib/gitlab/git.rb b/lib/gitlab/git.rb
index 71647099f83..9e8caa259d2 100644
--- a/lib/gitlab/git.rb
+++ b/lib/gitlab/git.rb
@@ -6,6 +6,7 @@ module Gitlab
 
     CommandError = Class.new(StandardError)
     CommitError = Class.new(StandardError)
+    OSError = Class.new(StandardError)
 
     class << self
       include Gitlab::EncodingHelper
diff --git a/lib/gitlab/git/repository.rb b/lib/gitlab/git/repository.rb
index 8137c582c0f..8ba12808c10 100644
--- a/lib/gitlab/git/repository.rb
+++ b/lib/gitlab/git/repository.rb
@@ -1311,7 +1311,15 @@ module Gitlab
       # rubocop:enable Metrics/ParameterLists
 
       def write_config(full_path:)
-        rugged.config['gitlab.fullpath'] = full_path if full_path.present?
+        return unless full_path.present?
+
+        gitaly_migrate(:write_config) do |is_enabled|
+          if is_enabled
+            gitaly_repository_client.write_config(full_path: full_path)
+          else
+            rugged_write_config(full_path: full_path)
+          end
+        end
       end
 
       def gitaly_repository
@@ -1451,6 +1459,10 @@ module Gitlab
         end
       end
 
+      def rugged_write_config(full_path:)
+        rugged.config['gitlab.fullpath'] = full_path
+      end
+
       def shell_write_ref(ref_path, ref, old_ref)
         raise ArgumentError, "invalid ref_path #{ref_path.inspect}" if ref_path.include?(' ')
         raise ArgumentError, "invalid ref #{ref.inspect}" if ref.include?("\x00")
diff --git a/lib/gitlab/gitaly_client/repository_service.rb b/lib/gitlab/gitaly_client/repository_service.rb
index 7adf32af209..60706b4f0d8 100644
--- a/lib/gitlab/gitaly_client/repository_service.rb
+++ b/lib/gitlab/gitaly_client/repository_service.rb
@@ -219,6 +219,19 @@ module Gitlab
 
         true
       end
+
+      def write_config(full_path:)
+        request = Gitaly::WriteConfigRequest.new(repository: @gitaly_repo, full_path: full_path)
+        response = GitalyClient.call(
+          @storage,
+          :repository_service,
+          :write_config,
+          request,
+          timeout: GitalyClient.fast_timeout
+        )
+
+        raise Gitlab::Git::OSError.new(response.error) unless response.error.empty?
+      end
     end
   end
 end
diff --git a/spec/lib/gitlab/git/repository_spec.rb b/spec/lib/gitlab/git/repository_spec.rb
index bf01e6ef8e8..6206e9bb0fb 100644
--- a/spec/lib/gitlab/git/repository_spec.rb
+++ b/spec/lib/gitlab/git/repository_spec.rb
@@ -1790,6 +1790,44 @@ describe Gitlab::Git::Repository, seed_helper: true do
     end
   end
 
+  describe '#write_config' do
+    before do
+      repository.rugged.config["gitlab.fullpath"] = repository.path
+    end
+
+    shared_examples 'writing repo config' do
+      context 'is given a path' do
+        it 'writes it to disk' do
+          repository.write_config(full_path: "not-the/real-path.git")
+
+          config = File.read(File.join(repository.path, "config"))
+
+          expect(config).to include("[gitlab]")
+          expect(config).to include("fullpath = not-the/real-path.git")
+        end
+      end
+
+      context 'it is given an empty path' do
+        it 'does not write it to disk' do
+          repository.write_config(full_path: "")
+
+          config = File.read(File.join(repository.path, "config"))
+
+          expect(config).to include("[gitlab]")
+          expect(config).to include("fullpath = #{repository.path}")
+        end
+      end
+    end
+
+    context "when gitaly_write_config is enabled" do
+      it_behaves_like "writing repo config"
+    end
+
+    context "when gitaly_write_config is disabled", :disable_gitaly do
+      it_behaves_like "writing repo config"
+    end
+  end
+
   describe '#merge' do
     let(:repository) do
       Gitlab::Git::Repository.new('default', TEST_MUTABLE_REPO_PATH, '')