Tool for doing Avalonia backports

Description:
  Avalonia Backport

Usage:
  backport [command] [options]

Options:
  --version       Show version information
  -?, -h, --help  Show help and usage information

Commands:
  cherry-pick, cherrypick  Cherry-pick merged PRs
  label                    Label backported PRs
  changelog                Generate changelog

To create a personal access token, go to:

• GitHub.com -> Click on your Avatar -> Settings -> Developer settings -> Personal access tokens -> Fine-grained tokens
• Click "Generate new token"
• Set the expiration to a suitable value
• Give the token a name e.g. "avalonia-backport"
• Select "AvaloniaUI" under "Resource owner"
• Select "Only select repositories" and then "AvaloniaUI/Avalonia"
• Under "Permissions" give the "Pull Requests" permission "Read and write" access
• Click "Generate token"

This token should be passed with the --token option to all commands.

Running the following where a release branch is checked out in the Avalonia repository:

backport cherrypick --token [token] --repository d:\projects\AvaloniaUI\Avalonia

Will first display the PRs that it has identified for backporting. These are PRs that have a backport-candidate-MAJ-MIN-x label but not the wont-backport or backported-MAJ-MIN-x where MAJ-MIN is the current release branch version:

4 PRs to backport:

#6456 Revert "Fix skia OpacityMask push and pop methods"
#6457 Don't display warning when WinUICompositorConnection succeeds.
#6226 ContentPresenter should create child without content, if template was set
#6392 [Menu] [Interaction] Allow end user to change menu show delay globally

4 PRs will be merged into branch 'stable/0.10.x' of 'd:\projects\AvaloniaUI\Avalonia'
Signature: Steven Kirk <[email protected]>.
Press Y to continue, any other key to abort.

Pressing y will cherry pick the merge commits for each of these PRs into the currently checked-out branch in the repository. If a conflict is encountered, the following will be displayed:

Merging #6576 Add GeometryGroup and CombinedGeometry - f51efd3318ae6413fa83c78248b8afd860e5ab7b
CONFLICT. Fix the conflict and press Y to continue, any other key to abort

In this case, fix the conflict and run git cherry-pick --continue in another terminal to commit. You can then press y at the prompt to continue.

If you want to continue from a previously merged PR, you can supply the --after option. For example if running git log shows:

commit 1193af3689bf6f243c44d2778b449cd11fd45fd9
Author: Dan Walmsley <[email protected]>
Date:   Tue Sep 28 12:05:58 2021 +0100

    Merge pull request #6652 from AvaloniaUI/feature/fbdev-customization

    Add a few customization points to Linux Framebuffer backend.

You can run:

backport --token [token] --repository d:\projects\AvaloniaUI\Avalonia --after 6552

To merge all PRs subsequent to 6552.

Once all PRs have been merged to the branch, you need to:

• Test!
• Push the branch
• Run the label command to label the PRs as backported

Running the following where a release branch is checked out in the Avalonia repository:

backport label --token [token] --repository d:\projects\AvaloniaUI\Avalonia

Will first display PRs that are tagged with a backport-candidate label for the current release branch, and already appear on the current release branch.

After displaying a list of PRs, press Y to label these PRs with backported-MAJ-MIN-x where MAJ-MIN is the current release branch.

A release branch is a branch with the format release/MAJ.MIN, for example release/11.0 in which case MAJ=11 and MIN=0. On such branches the backport candidate and backported labels can be calculated automatically. If they cannot be calculated, they can be supplied as arguments to the cherrypick and label commands.

Running the following where a release tag is checked out in the Avalonia repository will generate release notes:

backport changelog --token [token] --repository d:\projects\AvaloniaUI\Avalonia