perf: unshallow only when necessary

src/create-or-update-branch.ts

@@ -180,9 +180,12 @@ export async function createOrUpdateBranch(
     if (branchRemoteName == 'fork') {
       // If pushing to a fork we must fetch with 'unshallow' to avoid the following error on git push
       // ! [remote rejected] HEAD -> tests/push-branch-to-fork (shallow update not allowed)
-      await git.fetch([`${workingBase}:${workingBase}`], baseRemote, [
-        '--force'
-      ])
+      await git.fetch(
+        [`${workingBase}:${workingBase}`],
+        baseRemote,
+        ['--force'],
+        true
+      )
     } else {
       // If the remote is 'origin' we can git reset
       await git.checkout(workingBase)

src/git-command-manager.ts

@@ -105,7 +105,8 @@ export class GitCommandManager {
   async fetch(
     refSpec: string[],
     remoteName?: string,
-    options?: string[]
+    options?: string[],
+    unshallow = false
   ): Promise<void> {
     const args = ['-c', 'protocol.version=2', 'fetch']
     if (!refSpec.some(x => x === tagsRefSpec)) {
@@ -113,7 +114,9 @@ export class GitCommandManager {
     }
 
     args.push('--progress', '--no-recurse-submodules')
+
     if (
+      unshallow &&
       utils.fileExistsSync(path.join(this.workingDirectory, '.git', 'shallow'))
     ) {
       args.push('--unshallow')