Checking out multiple branches: fatal: ambiguous argument 'master': unknown revision or path not in the working tree

[terencedignon]

Hi Checkout team,

I'm trying to checkout both the PR branch & master so diffs can be run on the two and only modified files are linted. This returns a fatal error because master is not recognized. I think this PR (#155) addresses the issue, but I'm not sure.

Is there a way to hack around this in the meantime? Thank you!

fatal: ambiguous argument 'master': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'

Config

name: Javascript Presubmit

on: [pull_request]

jobs:
  lint:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2
      - name: Install npm packages
        run: npm install
      - name: Lint
        # Run ESLint on JS and JSX files that diff from master.
        run: git diff-index --name-only master | grep -E "(.*)\.(jsx|js)$" | xargs npx eslint

[terencedignon]

Update, changing checkout@v2 to checkout@v1 and modifying the run script works:
git diff --name-only origin/master HEAD | grep -E "(.*)\.(jsx|js)$" | xargs npx eslint

[ericsciple]

If you set fetch-depth: 0 it will fetch all history for all branches and tags.

[ericsciple]

Updating the readme with this PR

[jcopps]

If you set fetch-depth: 0 it will fetch all history for all branches and tags.

Will this still require v1 instead of v2?

[syedfaizan]

@jcopps yes, i was trying v2 and v3, it didn't work, after seeing this comment, i changed to v1 and it works!!

[sanderdg]

Why is this issue not being addressed? I cannot switch to v1 since it's not under my control so now I'm stuck.

edit: Found a solution:

git fetch origin master:refs/remotes/origin/master
git diff --name-only "feature/my-branch..origin/master"

[TomaszOrchowskiCodibly]

@sanderdg

I had similar problem with

fetch-depth: 0

i figured out that also works in v3 but i have to add origin like

git rev-list --count origin/main..$(git branch --show-current)

and this works