Sync snippet after git action

app/models/snippet.rb

@@ -197,6 +197,8 @@ class Snippet < ApplicationRecord
   end
 
   def blobs
+    return [] unless repository_exists?
+
     repository.ls_files(repository.root_ref).map { |file| Blob.lazy(self, repository.root_ref, file) }
   end
 

app/workers/post_receive.rb

@@ -77,6 +77,11 @@ class PostReceive # rubocop:disable Scalability/IdempotentWorker
 
     return false unless user
 
+    # We can remove once we implement multi-file snippets
+    # https://gitlab.com/gitlab-org/gitlab/-/issues/39269
+    blob = snippet.blobs.first
+    snippet.update(file_name: blob.path, content: blob.data) if blob
+
     # At the moment, we only expires the repository caches.
     # In the future we might need to call ProjectCacheWorker
     # (or the custom class we create) to update the snippet

changelogs/unreleased/fj-update-snippet-from-git-action.yml

+---
+title: Sync snippet after Git action
+merge_request: 26565
+author:
+type: changed

spec/models/snippet_spec.rb

@@ -511,6 +511,32 @@ describe Snippet do
     end
   end
 
+  describe '#blobs' do
+    let(:snippet) { create(:snippet) }
+
+    context 'when repository does not exist' do
+      it 'returns empty array' do
+        expect(snippet.blobs).to be_empty
+      end
+    end
+
+    context 'when repository exists' do
+      let(:snippet) { create(:snippet, :repository) }
+
+      it 'returns array of blobs' do
+        expect(snippet.blobs).to all(be_a(Blob))
+      end
+    end
+
+    it 'returns a blob representing the snippet data' do
+      blob = snippet.blob
+
+      expect(blob).to be_a(Blob)
+      expect(blob.path).to eq(snippet.file_name)
+      expect(blob.data).to eq(snippet.content)
+    end
+  end
+
   describe '#to_json' do
     let(:snippet) { build(:snippet) }
 

spec/workers/post_receive_spec.rb

@@ -421,17 +421,35 @@ describe PostReceive do
             perform
           end
         end
+
+        it 'updates the snippet db information' do
+          blob = snippet.blobs.first
+
+          expect(snippet).to receive(:update).with(file_name: blob.path, content: blob.data)
+
+          perform
+        end
+
+        context 'when snippet does not have any blob' do
+          it 'does not update snippet db information' do
+            allow(snippet).to receive(:blobs).and_return([])
+
+            expect(snippet).not_to receive(:update)
+
+            perform
+          end
+        end
       end
     end
 
     context 'with PersonalSnippet' do
-      let!(:snippet) { create(:personal_snippet, author: project.owner) }
+      let!(:snippet) { create(:personal_snippet, :repository, author: project.owner) }
 
       it_behaves_like 'snippet changes actions'
     end
 
     context 'with ProjectSnippet' do
-      let!(:snippet) { create(:project_snippet, project: project, author: project.owner) }
+      let!(:snippet) { create(:project_snippet, :repository, project: project, author: project.owner) }
 
       it_behaves_like 'snippet changes actions'
     end