Allow overriding branch name.

bin/git/getCommitAndBranch.js

@@ -6,17 +6,12 @@ import missingTravisInfo from '../ui/messages/errors/missingTravisInfo';
 import travisInternalBuild from '../ui/messages/warnings/travisInternalBuild';
 import { getBranch, getCommit, hasPreviousCommit } from './git';
 
-const notHead = (b) => {
-  if (!b || b === 'HEAD') {
-    return false;
-  }
-  return b;
-};
+const notHead = (branch) => (branch && branch !== 'HEAD' ? branch : false);
 
-export async function getCommitAndBranch({ patchBaseRef, inputFromCI, log } = {}) {
+export async function getCommitAndBranch({ branchName, patchBaseRef, ci, log } = {}) {
   // eslint-disable-next-line prefer-const
   let { commit, committedAt, committerEmail, committerName } = await getCommit();
-  let branch = patchBaseRef || (await getBranch());
+  let branch = notHead(branchName) || notHead(patchBaseRef) || (await getBranch());
 
   const {
     TRAVIS_EVENT_TYPE,
@@ -88,15 +83,13 @@ export async function getCommitAndBranch({ patchBaseRef, inputFromCI, log } = {}
       notHead(process.env.GERRIT_BRANCH) ||
       notHead(process.env.CI_BRANCH) ||
       notHead(process.env.GITHUB_REF) ||
-      notHead(branch) ||
       'HEAD';
   }
+
   // REPOSITORY_URL is for netlify: https://www.netlify.com/docs/continuous-deployment/
   const fromCI =
-    !!inputFromCI ||
-    !!process.env.CI ||
-    !!process.env.REPOSITORY_URL ||
-    !!process.env.GITHUB_REPOSITORY;
+    !!ci || !!process.env.CI || !!process.env.REPOSITORY_URL || !!process.env.GITHUB_REPOSITORY;
+
   log.debug(
     `git info: ${JSON.stringify({
       commit,

bin/lib/getOptions.js

@@ -64,6 +64,7 @@ export default async function getOptions({ argv, env, flags, log, packageJson })
       : undefined,
     createTunnel: !flags.storybookUrl && env.CHROMATIC_CREATE_TUNNEL !== 'false',
 
+    branchName: flags.branchName,
     patchHeadRef,
     patchBaseRef,
   };

bin/lib/getOptions.test.js

@@ -195,6 +195,12 @@ describe('await getOptions', () => {
       createTunnel: false,
     });
   });
+
+  it('allows you to specify the branch name', async () => {
+    expect(await getOptions(getContext(['--branch-name', 'my/branch']))).toMatchObject({
+      branchName: 'my/branch',
+    });
+  });
 });
 
 describe('getStorybookConfiguration', () => {

bin/lib/parseArgs.js

@@ -17,6 +17,7 @@ export default function parseArgs(argv) {
     Chromatic options
       --allow-console-errors  Continue running Chromatic even if there are errors logged to console in your Storybook.
       --auto-accept-changes [branch]  If there are any changes to the build, automatically accept them. Only for [branch], if specified. Globs are supported via picomatch.
+      --branch-name <branch>  Override the branch name. Only meant to be used for unsupported CI integrations and fixing cross-fork PR comparisons.
       --exit-once-uploaded [branch]  Exit with 0 once the built version has been published to Chromatic. Only for [branch], if specified. Globs are supported via picomatch.
       --exit-zero-on-changes [branch]  If all snapshots render but there are visual changes, exit with code 0 rather than the usual exit code 1. Only for [branch], if specified. Globs are supported via picomatch.
       --ignore-last-build-on-branch <branch>  Do not use the last build on this branch as a baseline if it is no longer in history (i.e. branch was rebased). Globs are supported via picomatch.
@@ -52,6 +53,7 @@ export default function parseArgs(argv) {
         'exit-zero-on-changes': { type: 'string' },
         'ignore-last-build-on-branch': { type: 'string' },
         only: { type: 'string' },
+        'branch-name': { type: 'string' },
         'patch-build': { type: 'string' },
         'preserve-missing': { type: 'boolean' },
         skip: { type: 'string' },

bin/tasks/gitInfo.js

@@ -19,9 +19,9 @@ const TesterSkipBuildMutation = `
 `;
 
 export const setGitInfo = async (ctx, task) => {
-  const { patchBaseRef, fromCI, ignoreLastBuildOnBranch, skip } = ctx.options;
+  const { branchName, patchBaseRef, fromCI, ignoreLastBuildOnBranch, skip } = ctx.options;
 
-  ctx.git = await getCommitAndBranch({ patchBaseRef, inputFromCI: fromCI, log: ctx.log });
+  ctx.git = await getCommitAndBranch({ branchName, patchBaseRef, ci: fromCI, log: ctx.log });
   ctx.git.version = await getVersion();
   const { branch, commit } = ctx.git;