Merge branch 'dm-fix-api-create-file-on-empty-repo' into 'master'

Fix creating a file in an empty repo using the API

Closes #28626

See merge request !9632

8 files changed, 52 insertions, 46 deletions

diff --git a/app/controllers/concerns/creates_commit.rb b/app/controllers/concerns/creates_commit.rb
index 2fe03020d2d..f897f828cec 100644
--- a/app/controllers/concerns/creates_commit.rb
+++ b/app/controllers/concerns/creates_commit.rb
@@ -4,7 +4,7 @@ module CreatesCommit
   def create_commit(service, success_path:, failure_path:, failure_view: nil, success_notice: nil)
     set_commit_variables
 
-    start_branch = @mr_target_branch unless initial_commit?
+    start_branch = @mr_target_branch
     commit_params = @commit_params.merge(
       start_project: @mr_target_project,
       start_branch: start_branch,
@@ -117,11 +117,6 @@ module CreatesCommit
     @mr_source_branch = guess_mr_source_branch
   end
 
-  def initial_commit?
-    @mr_target_branch.nil? ||
-      !@mr_target_project.repository.branch_exists?(@mr_target_branch)
-  end
-
   def guess_mr_source_branch
     # XXX: Happens when viewing a commit without a branch. In this case,
     # @target_branch would be the default branch for @mr_source_project,
diff --git a/app/models/repository.rb b/app/models/repository.rb
index 0dbf246c3a4..d410d60dbad 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -995,6 +995,8 @@ class Repository
   end
 
   def with_repo_branch_commit(start_repository, start_branch_name)
+    return yield(nil) if start_repository.empty_repo?
+
     branch_name_or_sha =
       if start_repository == self
         start_branch_name
diff --git a/app/services/files/base_service.rb b/app/services/files/base_service.rb
index 31869c2f01e..c8a60422bf4 100644
--- a/app/services/files/base_service.rb
+++ b/app/services/files/base_service.rb
@@ -58,16 +58,12 @@ module Files
         raise_error("You are not allowed to push into this branch")
       end
 
-      unless project.empty_repo?
-        unless @start_project.repository.branch_exists?(@start_branch)
-          raise_error('You can only create or edit files when you are on a branch')
-        end
-
-        if different_branch?
-          if repository.branch_exists?(@target_branch)
-            raise_error('Branch with such name already exists. You need to switch to this branch in order to make changes')
-          end
-        end
+      if !@start_project.empty_repo? && !@start_project.repository.branch_exists?(@start_branch)
+        raise ValidationError, 'You can only create or edit files when you are on a branch'
+      end
+
+      if !project.empty_repo? && different_branch? && repository.branch_exists?(@branch_name)
+        raise ValidationError, "A branch called #{@branch_name} already exists. Switch to that branch in order to make changes"
       end
     end
 
diff --git a/app/services/git_operation_service.rb b/app/services/git_operation_service.rb
index 27bcc047601..ed6ea638235 100644
--- a/app/services/git_operation_service.rb
+++ b/app/services/git_operation_service.rb
@@ -56,12 +56,16 @@ class GitOperationService
     start_project: repository.project,
     &block)
 
-    check_with_branch_arguments!(
-      branch_name, start_branch_name, start_project)
+    start_repository = start_project.repository
+    start_branch_name = nil if start_repository.empty_repo?
+
+    if start_branch_name && !start_repository.branch_exists?(start_branch_name)
+      raise ArgumentError, "Cannot find branch #{start_branch_name} in #{start_repository.path_with_namespace}"
+    end
 
     update_branch_with_hooks(branch_name) do
       repository.with_repo_branch_commit(
-        start_project.repository,
+        start_repository,
         start_branch_name || branch_name,
         &block)
     end
@@ -149,31 +153,4 @@ class GitOperationService
       repository.raw_repository.autocrlf = :input
     end
   end
-
-  def check_with_branch_arguments!(
-    branch_name, start_branch_name, start_project)
-    return if repository.branch_exists?(branch_name)
-
-    if repository.project != start_project
-      unless start_branch_name
-        raise ArgumentError,
-          'Should also pass :start_branch_name if' +
-          ' :start_project is different from current project'
-      end
-
-      unless start_project.repository.branch_exists?(start_branch_name)
-        raise ArgumentError,
-          "Cannot find branch #{branch_name} nor" \
-          " #{start_branch_name} from" \
-          " #{start_project.path_with_namespace}"
-      end
-    elsif start_branch_name
-      unless repository.branch_exists?(start_branch_name)
-        raise ArgumentError,
-          "Cannot find branch #{branch_name} nor" \
-          " #{start_branch_name} from" \
-          " #{repository.project.path_with_namespace}"
-      end
-    end
-  end
 end
diff --git a/changelogs/unreleased/dm-fix-api-create-file-on-empty-repo.yml b/changelogs/unreleased/dm-fix-api-create-file-on-empty-repo.yml
new file mode 100644
index 00000000000..7ac25c0a83e
--- /dev/null
+++ b/changelogs/unreleased/dm-fix-api-create-file-on-empty-repo.yml
@@ -0,0 +1,4 @@
+---
+title: Fix creating a file in an empty repo using the API
+merge_request: 9632
+author:
diff --git a/spec/factories/projects.rb b/spec/factories/projects.rb
index 586efdefdb3..04de3512125 100644
--- a/spec/factories/projects.rb
+++ b/spec/factories/projects.rb
@@ -39,6 +39,10 @@ FactoryGirl.define do
     trait :empty_repo do
       after(:create) do |project|
         project.create_repository
+
+        # We delete hooks so that gitlab-shell will not try to authenticate with
+        # an API that isn't running
+        FileUtils.rm_r(File.join(project.repository_storage_path, "#{project.path_with_namespace}.git", 'hooks'))
       end
     end
 
diff --git a/spec/requests/api/files_spec.rb b/spec/requests/api/files_spec.rb
index 31b1aca6d73..91f8a35e045 100644
--- a/spec/requests/api/files_spec.rb
+++ b/spec/requests/api/files_spec.rb
@@ -147,6 +147,20 @@ describe API::Files, api: true  do
         expect(last_commit.author_name).to eq(author_name)
       end
     end
+
+    context 'when the repo is empty' do
+      let!(:project) { create(:project_empty_repo, namespace: user.namespace ) }
+
+      it "creates a new file in project repo" do
+        post api("/projects/#{project.id}/repository/files", user), valid_params
+
+        expect(response).to have_http_status(201)
+        expect(json_response['file_path']).to eq('newfile.rb')
+        last_commit = project.repository.commit.raw
+        expect(last_commit.author_email).to eq(user.email)
+        expect(last_commit.author_name).to eq(user.name)
+      end
+    end
   end
 
   describe "PUT /projects/:id/repository/files" do
diff --git a/spec/requests/api/v3/files_spec.rb b/spec/requests/api/v3/files_spec.rb
index 93637053626..3b61139a2cd 100644
--- a/spec/requests/api/v3/files_spec.rb
+++ b/spec/requests/api/v3/files_spec.rb
@@ -148,6 +148,20 @@ describe API::V3::Files, api: true  do
         expect(last_commit.author_name).to eq(author_name)
       end
     end
+
+    context 'when the repo is empty' do
+      let!(:project) { create(:project_empty_repo, namespace: user.namespace ) }
+
+      it "creates a new file in project repo" do
+        post v3_api("/projects/#{project.id}/repository/files", user), valid_params
+
+        expect(response).to have_http_status(201)
+        expect(json_response['file_path']).to eq('newfile.rb')
+        last_commit = project.repository.commit.raw
+        expect(last_commit.author_email).to eq(user.email)
+        expect(last_commit.author_name).to eq(user.name)
+      end
+    end
   end
 
   describe "PUT /projects/:id/repository/files" do