fix: consider 'defaultBranch' setting when doing git clone

lib/util/git/index.spec.ts

@@ -1132,4 +1132,21 @@ describe('util/git/index', () => {
       expect(sha).toBe(git.getBranchCommit(defaultBranch));
     });
   });
+
+  describe('syncGit()', () => {
+    it('should clone a specified base branch', async () => {
+      tmpDir = await tmp.dir({ unsafeCleanup: true });
+      GlobalConfig.set({ baseBranches: ['develop'], localDir: tmpDir.path });
+      await git.initRepo({
+        url: origin.path,
+        defaultBranch: 'develop',
+      });
+      await git.syncGit();
+      const tmpGit = Git(tmpDir.path);
+      const branch = (
+        await tmpGit.raw(['rev-parse', '--abbrev-ref', 'HEAD'])
+      ).trim();
+      expect(branch).toBe('develop');
+    });
+  });
 });

lib/util/git/index.ts

@@ -412,6 +412,9 @@ export async function syncGit(): Promise<void> {
     const cloneStart = Date.now();
     try {
       const opts: string[] = [];
+      if (config.defaultBranch) {
+        opts.push('-b', config.defaultBranch);
+      }
       if (config.fullClone) {
         logger.debug('Performing full clone');
       } else {
@@ -467,7 +470,10 @@ export async function syncGit(): Promise<void> {
     }
     logger.warn({ err }, 'Cannot retrieve latest commit');
   }
-  config.currentBranch = config.currentBranch || (await getDefaultBranch(git));
+  config.currentBranch =
+    config.currentBranch ??
+    config.defaultBranch ??
+    (await getDefaultBranch(git));
   delete getCache()?.semanticCommits;
 }
 

lib/util/git/types.ts

@@ -16,6 +16,7 @@ export type LongCommitSha = string & { __longCommitSha: never };
 
 export interface StorageConfig {
   currentBranch?: string;
+  defaultBranch?: string;
   url: string;
   extraCloneOpts?: GitOptions;
   cloneSubmodules?: boolean;