How to reopen a pull-request after a force-push?

README.md

How to reopen a pull-request after a force-push?

Precodinitions

• You need the rights to reopen pull requests on the repository.
• The pull request hasn't been merged, just closed.

Instructions

1. Write down the current commit hash of your PR-branch git log --oneline -1 <PR-BRANCH>
2. Write down the latest commit hash on github before the PR has been closed.
3. git push -f origin <GITHUB-HASH-FROM-STEP-2>:<PR-BRANCH>
4. Reopen the PR.
5. git push -f origin <HASH-FROM-STEP-1>:<PR-BRANCH>

Example

You've a PR branch my-feature currently at 1234567. Looking at the the PRs page, we see that the PR was closed when my-feature pointed at 0abcdef.

• git push -f origin 0abcdef:my-feature #pushing the old commit the PR has been closed with
• Reopen the PR.
• git push -f origin 1234567:my-feature #pushing the latest commit

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How come that devs at github fucked up so hard, so we have to push/pull forth and back just to make PR working?

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This issue essentially is due to your PR and your origin branches having mismatching histories (caused by a force push after that PR closed). If your PR has multiple commits, you may need to reset the entire branch. For example

If your PR commit history is:

sha-0123 <- head
sha-1234
sha-2345

But your origin branch history is

sha-3210 <- head
sha-4321
sha-5432

You need to do reset your origin head to sha-0123, then force push your new history head to sha-3210:

# if you don't have commit `sha-0123`;
git fetch sha-0123
git co FEATURE-BRANCH
git reset sha-0123 --hard
git push --force
# **You should be able to reopen your PR at this point**
# reset to `sha-3210` on the same branch
git reset sha-3210 --hard
git push --force

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