Rename "master" branch to "main"?

[Joseph Myers]

On Tue, 30 Jun 2020, Carlos O'Donell via Libc-alpha wrote:

> I see only 1 reference in the hooks to "master" and it's for computing a 
> short name for email subjects that eschews the branch name 
> (updates/branches/update.py).

That hardcoding is still present in the latest version of the hooks so 
that should be reported as an issue at 
https://github.com/AdaCore/git-hooks/issues (I think it's reasonably 
different from my existing https://github.com/AdaCore/git-hooks/issues/8 
for customization of commit messages and hooks - a better upstream default 
would probably be for the hooks to determine automatically what the 
default branch for new clones is, and treat that branch specially, rather 
than needing a separate hooks configuration option to identify that 
branch).  Note that glibc uses a symlink to a shared installation of the 
hooks used by other sourceware projects (but not by GCC which has its own 
copy with further local changes).

In hooks-bin, email-to-bugzilla-filtered checks for master (and for 
release branches) to determine whether to report a commit to Bugzilla.  
Likewise post-receive for irker (although that seems to have been broken 
for some time anyway, I think because of freenode configuration changes).  
So the above reference is not the only one.

refs/meta/config:project.config has

        allow-non-fast-forward = (?!master|release.*)

so that would also need updating.

I don't know if there might be other places.

-- 
Joseph S. Myers
joseph@codesourcery.com