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

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`
-  query cmsBranches($owner: String!, $name: String!) {
+export const openAuthoringBranches = gql`
+  query openAuthoringBranches($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
         }