[ruby-core:96414] [Ruby master Misc#15843] Make "trunk" a symbolic-ref of "master" on git.ruby-lang.org

Issue #15843 has been updated by k0kubun (Takashi Kokubun).


Reminder to everyone:

> 2020 1/1: trunk branch cannot be git fetched and git pushed anymore.

The ruby.git's "trunk" branch will be deleted within 10 days.

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Misc #15843: Make "trunk" a symbolic-ref of "master" on git.ruby-lang.org
https://bugs.ruby-lang.org/issues/15843#change-83339

* Author: k0kubun (Takashi Kokubun)
* Status: Closed
* Priority: Normal
* Assignee: k0kubun (Takashi Kokubun)
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## Background

* We're using `trunk` branch as a canonical development branch because it has been mirrored to there by git-svn.
* In a usual git repository, a HEAD branch is `master` by default. Using `trunk` instead of `master` is confusing and causes typo on git operations or typing git-related URLs.
* We can make an *alias branch* by using symbolic-ref on `git.ruby-lang.org:ruby.git`. We can start using `master` branch without disturbing any `trunk` usage. Why not use it?

## Proposed schedule

* 2019
  * 5/22: Announce this schedule *(done)*
  * 5/23: Make `master` symbolic-ref pointing to `trunk` on git.ruby-lang.org *(done)*
  * 5/23~6/30: Ask maintainers of CI (or whatever integrated with the repository) to explicitly use `master` branch instead of `trunk` at ruby-core mailing list. *(asked)*
  * 7/1: Switch HEAD on git.ruby-lang.org from `trunk` to `master`, and reverse the symbolic-ref direction (change the default branch of GitHub ruby/ruby to `master` too) *(done)*
     * `sudo -u git bash -c "cd /var/git/ruby.git && mv refs/heads/trunk refs/heads/master && git symbolic-ref refs/heads/trunk refs/heads/master"`
* 2020
  * 1/1: Drop `trunk` branch on git.ruby-lang.org
     * `sudo -u git bash -c "cd /var/git/ruby.git && rm refs/heads/trunk"`

### Expected outcome

* 2019
  * 5/23:
     * `git push` to `trunk` branch of git.ruby-lang.org will be reflected to both `trunk` and `master` branches of git.ruby-lang.org immediately.
     * `git push` to `master` branch of git.ruby-lang.org will also be reflected to both `trunk` and `master` branches of git.ruby-lang.org immediately.
     * Both of `trunk` and `master` branches on GitHub will be always mirrored.
  * 7/1:
     * `git clone` checks out `master` instead of `trunk` by default.
* 2020
  * 1/1:
     * `trunk` branch cannot be `git fetch`ed and `git push`ed anymore.



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