Try cloning without actions/checkout

README.md

@@ -27,17 +27,6 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      # Perform a minimal checkout to set up this repository for the rest of the
-      # workflow.
-      #
-      # This step must be configured exactly as below: using different
-      # actions/checkout arguments is not supported.
-      - name: Checkout this repository
-        uses: actions/checkout@v4
-        with:
-          filter: tree:0
-
-      # Run the estimation tool
       - name: Run sizeup
         # TODO: Replace the version below with your desired version.
         uses: lerebear/[email protected]

src/initializer.ts

@@ -72,32 +72,20 @@ export async function fetchDiff(
 ): Promise<string | undefined> {
   const git = simpleGit('.', { trimmed: true })
 
-  // let baseRefExists = false
-  // try {
-  //   baseRefExists = !!(await git.raw('rev-parse', '--verify', pull.base.ref))
-  // } catch (e) {
-  //   core.error(
-  //     `Error from 'git rev-parse --verfy ${pull.base.ref}': ${
-  //       (e as Error).message
-  //     }`
-  //   )
-  // }
-
-  // if (!baseRefExists) {
-  //   core.setFailed(
-  //     `Could not find pull request base branch ${pull.base.ref}. ` +
-  //       `Please make sure actions/checkout was used beforehand to fetch ${pull.base.ref}.`
-  //   )
-  //   return
-  // }
-
-  core.debug(
-    `Fetching base ref "${pull.base.ref}" and head ref "${pull.head.ref}"`
-  )
+  core.debug(`Cloning just the base ref "${pull.base.ref}"`)
+  const cloneUrl = `https://${core.getInput('token')}@github.com/${
+    github.context.repo.owner
+  }/${github.context.repo.repo}`
+  await git.clone(cloneUrl, '.', [
+    `--branch=${pull.base.ref}`,
+    '--filter=tree:0',
+    '--no-tags',
+    '--single-branch'
+  ])
 
+  core.debug(`Fetching head ref "${pull.head.ref}"`)
   await git.fetch([
     'origin',
-    `+${pull.base.ref}:${pull.base.ref}`,
     `+${pull.head.ref}:${pull.head.ref}`,
     `--filter=tree:0`,
     '--no-tags',