add maintainer-can-modify input

README.md

@@ -75,6 +75,7 @@ All inputs are **optional**. If not set, sensible defaults will be used.
 | `team-reviewers` | A comma or newline-separated list of GitHub teams to request a review from. Note that a `repo` scoped [PAT](https://docs.github.com/en/github/authenticating-to-github/creating-a-personal-access-token), or equivalent [GitHub App permissions](docs/concepts-guidelines.md#authenticating-with-github-app-generated-tokens), are required. | |
 | `milestone` | The number of the milestone to associate this pull request with. | |
 | `draft` | Create a [draft pull request](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/about-pull-requests#draft-pull-requests). It is not possible to change draft status after creation except through the web interface. | `false` |
+| `maintainer-can-modify` | Indicates whether [maintainers can modify](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/allowing-changes-to-a-pull-request-branch-created-from-a-fork) the pull request. | `true` |
 
 #### commit-message
 

action.yml

@@ -77,6 +77,9 @@ inputs:
   draft:
     description: 'Create a draft pull request. It is not possible to change draft status after creation except through the web interface'
     default: false
+  maintainer-can-modify:
+    description: 'Indicates whether maintainers can modify the pull request.'
+    default: true
 outputs:
   pull-request-number:
     description: 'The pull request number'

dist/index.js

@@ -1169,7 +1169,9 @@ const core = __importStar(__nccwpck_require__(2186));
 const octokit_client_1 = __nccwpck_require__(5040);
 const p_limit_1 = __importDefault(__nccwpck_require__(3783));
 const utils = __importStar(__nccwpck_require__(918));
+const ERROR_PR_ALREADY_EXISTS = 'A pull request already exists for';
 const ERROR_PR_REVIEW_TOKEN_SCOPE = 'Validation Failed: "Could not resolve to a node with the global id of';
+const ERROR_PR_FORK_COLLAB = `Fork collab can't be granted by someone without permission`;
 const blobCreationLimit = (0, p_limit_1.default)(8);
 class GitHubHelper {
     constructor(githubServerHostname, token) {
@@ -1200,7 +1202,7 @@ class GitHubHelper {
             // Try to create the pull request
             try {
                 core.info(`Attempting creation of pull request`);
-                const { data: pull } = yield this.octokit.rest.pulls.create(Object.assign(Object.assign({}, this.parseRepository(baseRepository)), { title: inputs.title, head: headBranch, head_repo: headRepository, base: inputs.base, body: inputs.body, draft: inputs.draft }));
+                const { data: pull } = yield this.octokit.rest.pulls.create(Object.assign(Object.assign({}, this.parseRepository(baseRepository)), { title: inputs.title, head: headBranch, head_repo: headRepository, base: inputs.base, body: inputs.body, draft: inputs.draft, maintainer_can_modify: inputs.maintainerCanModify }));
                 core.info(`Created pull request #${pull.number} (${headBranch} => ${inputs.base})`);
                 return {
                     number: pull.number,
@@ -1209,9 +1211,15 @@ class GitHubHelper {
                 };
             }
             catch (e) {
-                if (utils.getErrorMessage(e).includes(`A pull request already exists for`)) {
+                const errorMessage = utils.getErrorMessage(e);
+                if (errorMessage.includes(ERROR_PR_ALREADY_EXISTS)) {
                     core.info(`A pull request already exists for ${headBranch}`);
                 }
+                else if (errorMessage.includes(ERROR_PR_FORK_COLLAB)) {
+                    core.warning('An attempt was made to create a pull request using a token that does not have write access to the head branch.');
+                    core.warning(`For this case, set input 'maintainer-can-modify' to 'false' to allow pull request creation.`);
+                    throw e;
+                }
                 else {
                     throw e;
                 }
@@ -1419,7 +1427,8 @@ function run() {
                 reviewers: utils.getInputAsArray('reviewers'),
                 teamReviewers: utils.getInputAsArray('team-reviewers'),
                 milestone: Number(core.getInput('milestone')),
-                draft: core.getBooleanInput('draft')
+                draft: core.getBooleanInput('draft'),
+                maintainerCanModify: core.getBooleanInput('maintainer-can-modify')
             };
             core.debug(`Inputs: ${(0, util_1.inspect)(inputs)}`);
             if (!inputs.token) {

src/create-pull-request.ts

@@ -33,6 +33,7 @@ export interface Inputs {
   teamReviewers: string[]
   milestone: number
   draft: boolean
+  maintainerCanModify: boolean
 }
 
 export async function createPullRequest(inputs: Inputs): Promise<void> {

src/github-helper.ts

@@ -5,8 +5,10 @@ import {Octokit, OctokitOptions, throttleOptions} from './octokit-client'
 import pLimit from 'p-limit'
 import * as utils from './utils'
 
+const ERROR_PR_ALREADY_EXISTS = 'A pull request already exists for'
 const ERROR_PR_REVIEW_TOKEN_SCOPE =
   'Validation Failed: "Could not resolve to a node with the global id of'
+const ERROR_PR_FORK_COLLAB = `Fork collab can't be granted by someone without permission`
 
 const blobCreationLimit = pLimit(8)
 
@@ -76,7 +78,8 @@ export class GitHubHelper {
         head_repo: headRepository,
         base: inputs.base,
         body: inputs.body,
-        draft: inputs.draft
+        draft: inputs.draft,
+        maintainer_can_modify: inputs.maintainerCanModify
       })
       core.info(
         `Created pull request #${pull.number} (${headBranch} => ${inputs.base})`
@@ -87,10 +90,17 @@ export class GitHubHelper {
         created: true
       }
     } catch (e) {
-      if (
-        utils.getErrorMessage(e).includes(`A pull request already exists for`)
-      ) {
+      const errorMessage = utils.getErrorMessage(e)
+      if (errorMessage.includes(ERROR_PR_ALREADY_EXISTS)) {
         core.info(`A pull request already exists for ${headBranch}`)
+      } else if (errorMessage.includes(ERROR_PR_FORK_COLLAB)) {
+        core.warning(
+          'An attempt was made to create a pull request using a token that does not have write access to the head branch.'
+        )
+        core.warning(
+          `For this case, set input 'maintainer-can-modify' to 'false' to allow pull request creation.`
+        )
+        throw e
       } else {
         throw e
       }

src/main.ts

@@ -28,7 +28,8 @@ async function run(): Promise<void> {
       reviewers: utils.getInputAsArray('reviewers'),
       teamReviewers: utils.getInputAsArray('team-reviewers'),
       milestone: Number(core.getInput('milestone')),
-      draft: core.getBooleanInput('draft')
+      draft: core.getBooleanInput('draft'),
+      maintainerCanModify: core.getBooleanInput('maintainer-can-modify')
     }
     core.debug(`Inputs: ${inspect(inputs)}`)