fix(github): Disable autoMergeAllowed field for GHE (#12458)

lib/platform/github/__snapshots__/index.spec.ts.snap

@@ -6998,6 +6998,17 @@ Object {
 
 exports[`platform/github/index initPlatform() should support custom endpoint 2`] = `
 Array [
+  Object {
+    "headers": Object {
+      "accept": "application/vnd.github.v3+json",
+      "accept-encoding": "gzip, deflate, br",
+      "authorization": "token 123test",
+      "host": "ghe.renovatebot.com",
+      "user-agent": "RenovateBot/0.0.0-semantic-release (https://github.com/renovatebot/renovate)",
+    },
+    "method": "HEAD",
+    "url": "https://ghe.renovatebot.com/",
+  },
   Object {
     "headers": Object {
       "accept": "application/vnd.github.v3+json",
@@ -7837,6 +7848,17 @@ Array [
 
 exports[`platform/github/index massageMarkdown(input) returns not-updated pr body for GHE 1`] = `
 Array [
+  Object {
+    "headers": Object {
+      "accept": "application/vnd.github.v3+json",
+      "accept-encoding": "gzip, deflate, br",
+      "authorization": "token 123test",
+      "host": "github.company.com",
+      "user-agent": "RenovateBot/0.0.0-semantic-release (https://github.com/renovatebot/renovate)",
+    },
+    "method": "HEAD",
+    "url": "https://github.company.com/",
+  },
   Object {
     "headers": Object {
       "accept": "application/vnd.github.v3+json",
@@ -7871,7 +7893,6 @@ Array [
             "name": "$name",
             "owner": "$owner",
           },
-          "autoMergeAllowed": null,
           "defaultBranchRef": Object {
             "name": null,
             "target": Object {
@@ -7896,7 +7917,7 @@ Array [
       "accept": "application/vnd.github.v3+json",
       "accept-encoding": "gzip, deflate, br",
       "authorization": "token 123test",
-      "content-length": "395",
+      "content-length": "373",
       "content-type": "application/json",
       "host": "github.company.com",
       "user-agent": "RenovateBot/0.0.0-semantic-release (https://github.com/renovatebot/renovate)",

lib/platform/github/index.spec.ts

@@ -111,6 +111,9 @@ describe('platform/github/index', () => {
     it('should support custom endpoint', async () => {
       httpMock
         .scope('https://ghe.renovatebot.com')
+        .head('/')
+        .reply(200, '', { 'x-github-enterprise-version': '3.0.15' })
+
         .get('/user')
         .reply(200, {
           login: 'renovate-bot',
@@ -2220,6 +2223,8 @@ describe('platform/github/index', () => {
     it('returns not-updated pr body for GHE', async () => {
       const scope = httpMock
         .scope('https://github.company.com')
+        .head('/')
+        .reply(200, '', { 'x-github-enterprise-version': '3.1.7' })
         .get('/user')
         .reply(200, {
           login: 'renovate-bot',
@@ -2407,9 +2412,9 @@ describe('platform/github/index', () => {
     });
     it('returns file content in json5 format', async () => {
       const json5Data = `
-        { 
+        {
           // json5 comment
-          foo: 'bar' 
+          foo: 'bar'
         }
       `;
       const scope = httpMock.scope(githubApiHost);

lib/platform/github/index.ts

@@ -3,6 +3,7 @@ import is from '@sindresorhus/is';
 import delay from 'delay';
 import JSON5 from 'json5';
 import { DateTime } from 'luxon';
+import { valid as semverValid } from 'semver';
 import { PlatformId } from '../../constants';
 import {
   PLATFORM_INTEGRATION_UNAUTHORIZED,
@@ -97,6 +98,19 @@ export async function initPlatform({
   } else {
     logger.debug('Using default github endpoint: ' + defaults.endpoint);
   }
+
+  config.isGhe = URL.parse(defaults.endpoint).host !== 'api.github.com';
+  if (config.isGhe) {
+    const gheHeaderKey = 'x-github-enterprise-version';
+    const gheQueryRes = await githubApi.head('/', { throwHttpErrors: false });
+    const gheHeaders: Record<string, string> = gheQueryRes?.headers || {};
+    const [, gheVersion] =
+      Object.entries(gheHeaders).find(
+        ([k]) => k.toLowerCase() === gheHeaderKey
+      ) ?? [];
+    config.gheVersion = semverValid(gheVersion) ?? null;
+  }
+
   let userDetails: UserDetails;
   let renovateUsername: string;
   if (username) {
@@ -187,7 +201,13 @@ export async function initRepo({
 }: RepoParams): Promise<RepoResult> {
   logger.debug(`initRepo("${repository}")`);
   // config is used by the platform api itself, not necessary for the app layer to know
-  config = { repository, cloneSubmodules, ignorePrAuthor } as any;
+  config = {
+    repository,
+    cloneSubmodules,
+    ignorePrAuthor,
+    isGhe: config.isGhe,
+    gheVersion: config.gheVersion,
+  } as any;
   // istanbul ignore if
   if (endpoint) {
     // Necessary for Renovate Pro - do not remove
@@ -199,14 +219,19 @@ export async function initRepo({
     hostType: PlatformId.Github,
     url: defaults.endpoint,
   });
-  config.isGhe = URL.parse(defaults.endpoint).host !== 'api.github.com';
   config.renovateUsername = renovateUsername;
   [config.repositoryOwner, config.repositoryName] = repository.split('/');
   let repo: GhRepo;
   try {
+    let infoQuery = repoInfoQuery;
+
+    if (config.isGhe) {
+      infoQuery = infoQuery.replace(/\n\s*autoMergeAllowed\s*\n/, '\n');
+    }
+
     const res = await githubApi.requestGraphql<{
       repository: GhRepo;
-    }>(repoInfoQuery, {
+    }>(infoQuery, {
       variables: {
         owner: config.repositoryOwner,
         name: config.repositoryName,
@@ -1418,7 +1443,7 @@ async function tryPrAutomerge(
     return;
   }
 
-  if (!config.autoMergeAllowed) {
+  if (config.autoMergeAllowed === false) {
     logger.debug(
       { prNumber },
       'GitHub-native automerge: not enabled in repo settings'

lib/platform/github/types.ts

@@ -71,6 +71,7 @@ export interface LocalRepoConfig {
   repositoryOwner: string;
   repository: string | null;
   isGhe: boolean;
+  gheVersion?: string | null;
   renovateUsername: string;
   productLinks: any;
   ignorePrAuthor: boolean;