Fix: don't try to migrate cms prs from forks (#3331)

cypress/fixtures/Github Backend Editorial Workflow - REST API - Open Authoring__can change entry status from fork.json

@@ -361,7 +361,7 @@
   },
   {
     "method": "GET",
-    "url": "/repos/forkOwner/repo/git/refs/heads/cms?ts=300",
+    "url": "/repos/forkOwner/repo/git/refs/heads/cms/forkOwner/repo?ts=300",
     "headers": {
       "Content-Type": "application/json; charset=utf-8",
       "Server": "GitHub.com",
@@ -992,4 +992,4 @@
     "response": "{\n  \"state\": \"pending\",\n  \"statuses\": [\n\n  ],\n  \"sha\": \"89cd642999af7e9da352bdfdd792703160d01f5a\",\n  \"total_count\": 0,\n  \"repository\": {\n    \"id\": 242194325,\n    \"node_id\": \"MDEwOlJlcG9zaXRvcnkyNDIxOTQzMjU=\",\n    \"name\": \"repo\",\n    \"full_name\": \"owner/repo\",\n    \"private\": false,\n    \"owner\": {\n      \"login\": \"owner\",\n      \"id\": 26760571,\n      \"node_id\": \"MDQ6VXNlcjI2NzYwNTcx\",\n      \"avatar_url\": \"https://avatars1.githubusercontent.com/u/7892489?v=4\",\n      \"gravatar_id\": \"\",\n      \"url\": \"https://api.github.com/users/owner\",\n      \"html_url\": \"https://github.com/owner\",\n      \"followers_url\": \"https://api.github.com/users/owner/followers\",\n      \"following_url\": \"https://api.github.com/users/owner/following{/other_user}\",\n      \"gists_url\": \"https://api.github.com/users/owner/gists{/gist_id}\",\n      \"starred_url\": \"https://api.github.com/users/owner/starred{/owner}{/repo}\",\n      \"subscriptions_url\": \"https://api.github.com/users/owner/subscriptions\",\n      \"organizations_url\": \"https://api.github.com/users/owner/orgs\",\n      \"repos_url\": \"https://api.github.com/users/owner/repos\",\n      \"events_url\": \"https://api.github.com/users/owner/events{/privacy}\",\n      \"received_events_url\": \"https://api.github.com/users/owner/received_events\",\n      \"type\": \"User\",\n      \"site_admin\": false\n    },\n    \"html_url\": \"https://github.com/owner/repo\",\n    \"description\": null,\n    \"fork\": false,\n    \"url\": \"https://api.github.com/repos/owner/repo\",\n    \"forks_url\": \"https://api.github.com/repos/owner/repo/forks\",\n    \"keys_url\": \"https://api.github.com/repos/owner/repo/keys{/key_id}\",\n    \"collaborators_url\": \"https://api.github.com/repos/owner/repo/collaborators{/collaborator}\",\n    \"teams_url\": \"https://api.github.com/repos/owner/repo/teams\",\n    \"hooks_url\": \"https://api.github.com/repos/owner/repo/hooks\",\n    \"issue_events_url\": \"https://api.github.com/repos/owner/repo/issues/events{/number}\",\n    \"events_url\": \"https://api.github.com/repos/owner/repo/events\",\n    \"assignees_url\": \"https://api.github.com/repos/owner/repo/assignees{/user}\",\n    \"branches_url\": \"https://api.github.com/repos/owner/repo/branches{/branch}\",\n    \"tags_url\": \"https://api.github.com/repos/owner/repo/tags\",\n    \"blobs_url\": \"https://api.github.com/repos/owner/repo/git/blobs{/sha}\",\n    \"git_tags_url\": \"https://api.github.com/repos/owner/repo/git/tags{/sha}\",\n    \"git_refs_url\": \"https://api.github.com/repos/owner/repo/git/refs{/sha}\",\n    \"trees_url\": \"https://api.github.com/repos/owner/repo/git/trees{/sha}\",\n    \"statuses_url\": \"https://api.github.com/repos/owner/repo/statuses/{sha}\",\n    \"languages_url\": \"https://api.github.com/repos/owner/repo/languages\",\n    \"stargazers_url\": \"https://api.github.com/repos/owner/repo/stargazers\",\n    \"contributors_url\": \"https://api.github.com/repos/owner/repo/contributors\",\n    \"subscribers_url\": \"https://api.github.com/repos/owner/repo/subscribers\",\n    \"subscription_url\": \"https://api.github.com/repos/owner/repo/subscription\",\n    \"commits_url\": \"https://api.github.com/repos/owner/repo/commits{/sha}\",\n    \"git_commits_url\": \"https://api.github.com/repos/owner/repo/git/commits{/sha}\",\n    \"comments_url\": \"https://api.github.com/repos/owner/repo/comments{/number}\",\n    \"issue_comment_url\": \"https://api.github.com/repos/owner/repo/issues/comments{/number}\",\n    \"contents_url\": \"https://api.github.com/repos/owner/repo/contents/{+path}\",\n    \"compare_url\": \"https://api.github.com/repos/owner/repo/compare/{base}...{head}\",\n    \"merges_url\": \"https://api.github.com/repos/owner/repo/merges\",\n    \"archive_url\": \"https://api.github.com/repos/owner/repo/{archive_format}{/ref}\",\n    \"downloads_url\": \"https://api.github.com/repos/owner/repo/downloads\",\n    \"issues_url\": \"https://api.github.com/repos/owner/repo/issues{/number}\",\n    \"pulls_url\": \"https://api.github.com/repos/owner/repo/pulls{/number}\",\n    \"milestones_url\": \"https://api.github.com/repos/owner/repo/milestones{/number}\",\n    \"notifications_url\": \"https://api.github.com/repos/owner/repo/notifications{?since,all,participating}\",\n    \"labels_url\": \"https://api.github.com/repos/owner/repo/labels{/name}\",\n    \"releases_url\": \"https://api.github.com/repos/owner/repo/releases{/id}\",\n    \"deployments_url\": \"https://api.github.com/repos/owner/repo/deployments\"\n  },\n  \"commit_url\": \"https://api.github.com/repos/owner/repo/commits/89cd642999af7e9da352bdfdd792703160d01f5a\",\n  \"url\": \"https://api.github.com/repos/owner/repo/commits/89cd642999af7e9da352bdfdd792703160d01f5a/status\"\n}\n",
     "status": 200
   }
-]
+]

cypress/fixtures/Github Backend Editorial Workflow - REST API - Open Authoring__can create an entry on fork.json

@@ -388,7 +388,7 @@
   },
   {
     "method": "GET",
-    "url": "/repos/forkOwner/repo/git/refs/heads/cms?ts=300",
+    "url": "/repos/forkOwner/repo/git/refs/heads/cms/forkOwner/repo?ts=300",
     "headers": {
       "Content-Type": "application/json; charset=utf-8",
       "Server": "GitHub.com",
@@ -809,4 +809,4 @@
     "response": "{\n  \"state\": \"pending\",\n  \"statuses\": [\n\n  ],\n  \"sha\": \"dccdcb397cda0c05b4467c9c438d26a11a84081f\",\n  \"total_count\": 0,\n  \"repository\": {\n    \"id\": 242187005,\n    \"node_id\": \"MDEwOlJlcG9zaXRvcnkyNDIxODcwMDU=\",\n    \"name\": \"repo\",\n    \"full_name\": \"owner/repo\",\n    \"private\": false,\n    \"owner\": {\n      \"login\": \"owner\",\n      \"id\": 26760571,\n      \"node_id\": \"MDQ6VXNlcjI2NzYwNTcx\",\n      \"avatar_url\": \"https://avatars1.githubusercontent.com/u/7892489?v=4\",\n      \"gravatar_id\": \"\",\n      \"url\": \"https://api.github.com/users/owner\",\n      \"html_url\": \"https://github.com/owner\",\n      \"followers_url\": \"https://api.github.com/users/owner/followers\",\n      \"following_url\": \"https://api.github.com/users/owner/following{/other_user}\",\n      \"gists_url\": \"https://api.github.com/users/owner/gists{/gist_id}\",\n      \"starred_url\": \"https://api.github.com/users/owner/starred{/owner}{/repo}\",\n      \"subscriptions_url\": \"https://api.github.com/users/owner/subscriptions\",\n      \"organizations_url\": \"https://api.github.com/users/owner/orgs\",\n      \"repos_url\": \"https://api.github.com/users/owner/repos\",\n      \"events_url\": \"https://api.github.com/users/owner/events{/privacy}\",\n      \"received_events_url\": \"https://api.github.com/users/owner/received_events\",\n      \"type\": \"User\",\n      \"site_admin\": false\n    },\n    \"html_url\": \"https://github.com/owner/repo\",\n    \"description\": null,\n    \"fork\": false,\n    \"url\": \"https://api.github.com/repos/owner/repo\",\n    \"forks_url\": \"https://api.github.com/repos/owner/repo/forks\",\n    \"keys_url\": \"https://api.github.com/repos/owner/repo/keys{/key_id}\",\n    \"collaborators_url\": \"https://api.github.com/repos/owner/repo/collaborators{/collaborator}\",\n    \"teams_url\": \"https://api.github.com/repos/owner/repo/teams\",\n    \"hooks_url\": \"https://api.github.com/repos/owner/repo/hooks\",\n    \"issue_events_url\": \"https://api.github.com/repos/owner/repo/issues/events{/number}\",\n    \"events_url\": \"https://api.github.com/repos/owner/repo/events\",\n    \"assignees_url\": \"https://api.github.com/repos/owner/repo/assignees{/user}\",\n    \"branches_url\": \"https://api.github.com/repos/owner/repo/branches{/branch}\",\n    \"tags_url\": \"https://api.github.com/repos/owner/repo/tags\",\n    \"blobs_url\": \"https://api.github.com/repos/owner/repo/git/blobs{/sha}\",\n    \"git_tags_url\": \"https://api.github.com/repos/owner/repo/git/tags{/sha}\",\n    \"git_refs_url\": \"https://api.github.com/repos/owner/repo/git/refs{/sha}\",\n    \"trees_url\": \"https://api.github.com/repos/owner/repo/git/trees{/sha}\",\n    \"statuses_url\": \"https://api.github.com/repos/owner/repo/statuses/{sha}\",\n    \"languages_url\": \"https://api.github.com/repos/owner/repo/languages\",\n    \"stargazers_url\": \"https://api.github.com/repos/owner/repo/stargazers\",\n    \"contributors_url\": \"https://api.github.com/repos/owner/repo/contributors\",\n    \"subscribers_url\": \"https://api.github.com/repos/owner/repo/subscribers\",\n    \"subscription_url\": \"https://api.github.com/repos/owner/repo/subscription\",\n    \"commits_url\": \"https://api.github.com/repos/owner/repo/commits{/sha}\",\n    \"git_commits_url\": \"https://api.github.com/repos/owner/repo/git/commits{/sha}\",\n    \"comments_url\": \"https://api.github.com/repos/owner/repo/comments{/number}\",\n    \"issue_comment_url\": \"https://api.github.com/repos/owner/repo/issues/comments{/number}\",\n    \"contents_url\": \"https://api.github.com/repos/owner/repo/contents/{+path}\",\n    \"compare_url\": \"https://api.github.com/repos/owner/repo/compare/{base}...{head}\",\n    \"merges_url\": \"https://api.github.com/repos/owner/repo/merges\",\n    \"archive_url\": \"https://api.github.com/repos/owner/repo/{archive_format}{/ref}\",\n    \"downloads_url\": \"https://api.github.com/repos/owner/repo/downloads\",\n    \"issues_url\": \"https://api.github.com/repos/owner/repo/issues{/number}\",\n    \"pulls_url\": \"https://api.github.com/repos/owner/repo/pulls{/number}\",\n    \"milestones_url\": \"https://api.github.com/repos/owner/repo/milestones{/number}\",\n    \"notifications_url\": \"https://api.github.com/repos/owner/repo/notifications{?since,all,participating}\",\n    \"labels_url\": \"https://api.github.com/repos/owner/repo/labels{/name}\",\n    \"releases_url\": \"https://api.github.com/repos/owner/repo/releases{/id}\",\n    \"deployments_url\": \"https://api.github.com/repos/owner/repo/deployments\"\n  },\n  \"commit_url\": \"https://api.github.com/repos/owner/repo/commits/dccdcb397cda0c05b4467c9c438d26a11a84081f\",\n  \"url\": \"https://api.github.com/repos/owner/repo/commits/dccdcb397cda0c05b4467c9c438d26a11a84081f/status\"\n}\n",
     "status": 200
   }
-]
+]

cypress/fixtures/Github Backend Editorial Workflow - REST API - Open Authoring__can delete review entry from fork.json

@@ -362,7 +362,7 @@
   },
   {
     "method": "GET",
-    "url": "/repos/forkOwner/repo/git/refs/heads/cms?ts=300",
+    "url": "/repos/forkOwner/repo/git/refs/heads/cms/forkOwner/repo?ts=300",
     "headers": {
       "Content-Type": "application/json; charset=utf-8",
       "Server": "GitHub.com",
@@ -1069,4 +1069,4 @@
     "response": "{\n  \"message\": \"Branch not found\",\n  \"documentation_url\": \"https://developer.github.com/v3/repos/branches/#get-branch\"\n}\n",
     "status": 404
   }
-]
+]

cypress/fixtures/Github Backend Editorial Workflow - REST API - Open Authoring__can return entry to draft and delete it.json

@@ -388,7 +388,7 @@
   },
   {
     "method": "GET",
-    "url": "/repos/forkOwner/repo/git/refs/heads/cms?ts=300",
+    "url": "/repos/forkOwner/repo/git/refs/heads/cms/forkOwner/repo?ts=300",
     "headers": {
       "Content-Type": "application/json; charset=utf-8",
       "Server": "GitHub.com",
@@ -1201,4 +1201,4 @@
     "response": null,
     "status": 204
   }
-]
+]

cypress/fixtures/Github Backend Editorial Workflow - REST API - Open Authoring__can update a draft entry on fork.json

@@ -388,7 +388,7 @@
   },
   {
     "method": "GET",
-    "url": "/repos/forkOwner/repo/git/refs/heads/cms?ts=300",
+    "url": "/repos/forkOwner/repo/git/refs/heads/cms/forkOwner/repo?ts=300",
     "headers": {
       "Content-Type": "application/json; charset=utf-8",
       "Server": "GitHub.com",
@@ -1700,4 +1700,4 @@
     "response": "{\n  \"state\": \"pending\",\n  \"statuses\": [\n\n  ],\n  \"sha\": \"7df12929d6ead77820cc3f4b07d4aef810390774\",\n  \"total_count\": 0,\n  \"repository\": {\n    \"id\": 242187005,\n    \"node_id\": \"MDEwOlJlcG9zaXRvcnkyNDIxODcwMDU=\",\n    \"name\": \"repo\",\n    \"full_name\": \"owner/repo\",\n    \"private\": false,\n    \"owner\": {\n      \"login\": \"owner\",\n      \"id\": 26760571,\n      \"node_id\": \"MDQ6VXNlcjI2NzYwNTcx\",\n      \"avatar_url\": \"https://avatars1.githubusercontent.com/u/7892489?v=4\",\n      \"gravatar_id\": \"\",\n      \"url\": \"https://api.github.com/users/owner\",\n      \"html_url\": \"https://github.com/owner\",\n      \"followers_url\": \"https://api.github.com/users/owner/followers\",\n      \"following_url\": \"https://api.github.com/users/owner/following{/other_user}\",\n      \"gists_url\": \"https://api.github.com/users/owner/gists{/gist_id}\",\n      \"starred_url\": \"https://api.github.com/users/owner/starred{/owner}{/repo}\",\n      \"subscriptions_url\": \"https://api.github.com/users/owner/subscriptions\",\n      \"organizations_url\": \"https://api.github.com/users/owner/orgs\",\n      \"repos_url\": \"https://api.github.com/users/owner/repos\",\n      \"events_url\": \"https://api.github.com/users/owner/events{/privacy}\",\n      \"received_events_url\": \"https://api.github.com/users/owner/received_events\",\n      \"type\": \"User\",\n      \"site_admin\": false\n    },\n    \"html_url\": \"https://github.com/owner/repo\",\n    \"description\": null,\n    \"fork\": false,\n    \"url\": \"https://api.github.com/repos/owner/repo\",\n    \"forks_url\": \"https://api.github.com/repos/owner/repo/forks\",\n    \"keys_url\": \"https://api.github.com/repos/owner/repo/keys{/key_id}\",\n    \"collaborators_url\": \"https://api.github.com/repos/owner/repo/collaborators{/collaborator}\",\n    \"teams_url\": \"https://api.github.com/repos/owner/repo/teams\",\n    \"hooks_url\": \"https://api.github.com/repos/owner/repo/hooks\",\n    \"issue_events_url\": \"https://api.github.com/repos/owner/repo/issues/events{/number}\",\n    \"events_url\": \"https://api.github.com/repos/owner/repo/events\",\n    \"assignees_url\": \"https://api.github.com/repos/owner/repo/assignees{/user}\",\n    \"branches_url\": \"https://api.github.com/repos/owner/repo/branches{/branch}\",\n    \"tags_url\": \"https://api.github.com/repos/owner/repo/tags\",\n    \"blobs_url\": \"https://api.github.com/repos/owner/repo/git/blobs{/sha}\",\n    \"git_tags_url\": \"https://api.github.com/repos/owner/repo/git/tags{/sha}\",\n    \"git_refs_url\": \"https://api.github.com/repos/owner/repo/git/refs{/sha}\",\n    \"trees_url\": \"https://api.github.com/repos/owner/repo/git/trees{/sha}\",\n    \"statuses_url\": \"https://api.github.com/repos/owner/repo/statuses/{sha}\",\n    \"languages_url\": \"https://api.github.com/repos/owner/repo/languages\",\n    \"stargazers_url\": \"https://api.github.com/repos/owner/repo/stargazers\",\n    \"contributors_url\": \"https://api.github.com/repos/owner/repo/contributors\",\n    \"subscribers_url\": \"https://api.github.com/repos/owner/repo/subscribers\",\n    \"subscription_url\": \"https://api.github.com/repos/owner/repo/subscription\",\n    \"commits_url\": \"https://api.github.com/repos/owner/repo/commits{/sha}\",\n    \"git_commits_url\": \"https://api.github.com/repos/owner/repo/git/commits{/sha}\",\n    \"comments_url\": \"https://api.github.com/repos/owner/repo/comments{/number}\",\n    \"issue_comment_url\": \"https://api.github.com/repos/owner/repo/issues/comments{/number}\",\n    \"contents_url\": \"https://api.github.com/repos/owner/repo/contents/{+path}\",\n    \"compare_url\": \"https://api.github.com/repos/owner/repo/compare/{base}...{head}\",\n    \"merges_url\": \"https://api.github.com/repos/owner/repo/merges\",\n    \"archive_url\": \"https://api.github.com/repos/owner/repo/{archive_format}{/ref}\",\n    \"downloads_url\": \"https://api.github.com/repos/owner/repo/downloads\",\n    \"issues_url\": \"https://api.github.com/repos/owner/repo/issues{/number}\",\n    \"pulls_url\": \"https://api.github.com/repos/owner/repo/pulls{/number}\",\n    \"milestones_url\": \"https://api.github.com/repos/owner/repo/milestones{/number}\",\n    \"notifications_url\": \"https://api.github.com/repos/owner/repo/notifications{?since,all,participating}\",\n    \"labels_url\": \"https://api.github.com/repos/owner/repo/labels{/name}\",\n    \"releases_url\": \"https://api.github.com/repos/owner/repo/releases{/id}\",\n    \"deployments_url\": \"https://api.github.com/repos/owner/repo/deployments\"\n  },\n  \"commit_url\": \"https://api.github.com/repos/owner/repo/commits/7df12929d6ead77820cc3f4b07d4aef810390774\",\n  \"url\": \"https://api.github.com/repos/owner/repo/commits/7df12929d6ead77820cc3f4b07d4aef810390774/status\"\n}\n",
     "status": 200
   }
-]
+]

cypress/integration/editorial_workflow_spec_github_backend_graphql.js

@@ -5,7 +5,7 @@ import { entry1, entry2, entry3 } from './common/entries';
 const backend = 'github';
 
 describe('Github Backend Editorial Workflow - GraphQL API', () => {
-  let taskResult = { data: {} };
+  const taskResult = { data: {} };
 
   before(() => {
     specUtils.before(

cypress/integration/editorial_workflow_spec_github_backend_graphql_open_authoring.js

@@ -5,7 +5,7 @@ import { entry1, entry2, entry3 } from './common/entries';
 const backend = 'github';
 
 describe('Github Backend Editorial Workflow - GraphQL API - Open Authoring', () => {
-  let taskResult = { data: {} };
+  const taskResult = { data: {} };
 
   before(() => {
     specUtils.before(

cypress/integration/media_library_spec_github_backend_graphql.js

@@ -5,7 +5,7 @@ import * as specUtils from './common/spec_utils';
 const backend = 'github';
 
 describe('GitHub Backend Media Library - GraphQL API', () => {
-  let taskResult = { data: {} };
+  const taskResult = { data: {} };
 
   before(() => {
     specUtils.before(

cypress/integration/simple_workflow_spec_github_backend_graphql.js

@@ -5,7 +5,7 @@ import { entry1, entry2, entry3 } from './common/entries';
 const backend = 'github';
 
 describe('GitHub Backend Simple Workflow - GraphQL API', () => {
-  let taskResult = { data: {} };
+  const taskResult = { data: {} };
 
   before(() => {
     specUtils.before(

cypress/plugins/github.js

@@ -287,7 +287,10 @@ const sanitizeString = (
     .replace(new RegExp(escapeRegExp(owner), 'g'), GITHUB_REPO_OWNER_SANITIZED_VALUE)
     .replace(new RegExp(escapeRegExp(repo), 'g'), GITHUB_REPO_NAME_SANITIZED_VALUE)
     .replace(new RegExp(escapeRegExp(token), 'g'), GITHUB_REPO_TOKEN_SANITIZED_VALUE)
-    .replace(new RegExp('https://avatars.+?/u/.+?v=\\d', 'g'), `${FAKE_OWNER_USER.avatar_url}`);
+    .replace(
+      new RegExp('https://avatars\\d+\\.githubusercontent\\.com/u/\\d+?\\?v=\\d', 'g'),
+      `${FAKE_OWNER_USER.avatar_url}`,
+    );
 
   if (ownerName) {
     replaced = replaced.replace(new RegExp(escapeRegExp(ownerName), 'g'), FAKE_OWNER_USER.name);

packages/netlify-cms-backend-github/src/API.ts

@@ -719,6 +719,7 @@ export default class API {
     let metadata = await this.retrieveMetadataOld(contentKey).catch(() => undefined);
 
     if (!metadata) {
+      console.log(`Skipped migrating Pull Request '${number}' (${countMessage})`);
       return;
     }
 
@@ -753,9 +754,9 @@ export default class API {
     );
   }
 
-  async getCmsBranches() {
+  async getOpenAuthoringBranches() {
     const cmsBranches = await this.requestAllPages<Octokit.GitListMatchingRefsResponseItem>(
-      `${this.repoURL}/git/refs/heads/cms`,
+      `${this.repoURL}/git/refs/heads/cms/${this.repo}`,
     ).catch(() => [] as Octokit.GitListMatchingRefsResponseItem[]);
     return cmsBranches;
   }
@@ -769,7 +770,7 @@ export default class API {
     let branches: string[];
     if (this.useOpenAuthoring) {
       // open authoring branches can exist without a pr
-      const cmsBranches: Octokit.GitListMatchingRefsResponse = await this.getCmsBranches();
+      const cmsBranches: Octokit.GitListMatchingRefsResponse = await this.getOpenAuthoringBranches();
       branches = cmsBranches.map(b => b.ref.substring('refs/heads/'.length));
       // filter irrelevant branches
       const branchesWithFilter = await Promise.all(
@@ -781,7 +782,7 @@ export default class API {
       const pullRequests = await this.getPullRequests(
         undefined,
         PullRequestState.Open,
-        withoutCmsLabel,
+        pr => !pr.head.repo.fork && withoutCmsLabel(pr),
       );
       let prCount = 0;
       for (const pr of pullRequests) {

packages/netlify-cms-backend-github/src/GraphQLAPI.ts

@@ -62,13 +62,17 @@ type GraphQLPullRequest = {
   title: string;
   mergedAt: string | null;
   labels: { nodes: { name: string }[] };
+  repository: {
+    id: string;
+    isFork: boolean;
+  };
 };
 
 const transformPullRequest = (pr: GraphQLPullRequest) => {
   return {
     ...pr,
     labels: pr.labels.nodes,
-    head: { ref: pr.headRefName, sha: pr.headRefOid },
+    head: { ref: pr.headRefName, sha: pr.headRefOid, repo: { fork: pr.repository.isFork } },
     base: { ref: pr.baseRefName, sha: pr.baseRefOid },
   };
 };
@@ -266,13 +270,14 @@ export default class GraphQLAPI extends API {
     );
   }
 
-  async getCmsBranches() {
+  async getOpenAuthoringBranches() {
     const { repoOwner: owner, repoName: name } = this;
     const { data } = await this.query({
-      query: queries.cmsBranches,
+      query: queries.openAuthoringBranches,
       variables: {
         owner,
         name,
+        refPrefix: `refs/heads/cms/${this.repo}/`,
       },
     });
 

packages/netlify-cms-backend-github/src/fragments.ts

@@ -3,6 +3,7 @@ import gql from 'graphql-tag';
 export const repository = gql`
   fragment RepositoryParts on Repository {
     id
+    isFork
   }
 `;
 

packages/netlify-cms-backend-github/src/queries.ts

@@ -126,11 +126,11 @@ export const branch = gql`
   ${fragments.branch}
 `;
 
-export const cmsBranches = gql`
+export const openAuthoringBranches = gql`
-  query cmsBranches($owner: String!, $name: String!) {
+  query openAuthoringBranches($owner: String!, $name: String!, $refPrefix: String!) {
     repository(owner: $owner, name: $name) {
       ...RepositoryParts
-      refs(refPrefix: "refs/heads/cms/", last: 100) {
+      refs(refPrefix: $refPrefix, last: 100) {
         nodes {
           ...BranchParts
         }