[libvirt] [PATCH 2/2] travis: unlink python package before upgrading brew packages

[Andrea Bolognani]

On Thu, 2018-03-15 at 13:33 +0000, Daniel P. Berrangé wrote:
> The 'brew upgrade' command is pulling in the python2 package which
> promptly fails due to clashing symlinks installed by the new python
> package (which is python3 based):
> 
> ==> Pouring python at 2-2.7.14_3.sierra.bottle.tar.gz
> Error: The `brew link` step did not complete successfully
> The formula built, but is not symlinked into /usr/local
> Could not symlink bin/2to3-2
> Target /usr/local/bin/2to3-2
> is a symlink belonging to python. You can unlink it:
>   brew unlink python
> To force the link and overwrite all conflicting files:
>   brew link --overwrite python at 2
> To list all files that would be deleted:
>   brew link --overwrite --dry-run python at 2
> 
> By running 'brew unlink python' we can get rid of the python3 links that
> we didn't want in the first place and avoid this error.

The behavior of homebrew with respect to linking seems completely
insane to me. Why would you need to manually apply a workaround in
order to upgrade an existing system?

Anyway, this seems to work, so

  Reviewed-by: Andrea Bolognani <abologna at redhat.com>

-- 
Andrea Bolognani / Red Hat / Virtualization