Checkout base branch for PR and successively checkout merge branch

[frabert]

I would like to do something like

• checkout base branch
• do stuff on it
• checkout merge branch in the same local repo
• do other stuff on it

is it possible to do so using the action directly?

[hackedbad]

Ha

[chennareddy143]

haa

[henrygriffiths]

Hi @frabert,

Does this match what you'd like to do?

on: pull_request
...
- uses: actions/checkout@v3
    ref: ${{ github.event.pull_request.base.ref }}
- name: Do stuff on base branch
- uses: actions/checkout@v3
    ref: ${{ github.event.pull_request.head.ref }}
- name: Do stuff on merge branch

[frabert]

Unfortunately this has the effect of wiping the repo directory, which nullifies the advantages I would get from only updating the files changed between base and HEAD

[henrygriffiths]

Would just running a git checkout then resolve your issue?

on: pull_request
...
- uses: actions/checkout@v3
    ref: ${{ github.event.pull_request.base.ref }}
    fetch-depth: 0
- name: Do stuff on base branch
- run: git checkout ${{ github.event.pull_request.head.ref }}
- name: Do stuff on merge branch

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