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

[Daniel P. Berrangé]

On Thu, Mar 15, 2018 at 02:58:56PM +0100, Andrea Bolognani wrote:
> 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?

I don't think this is really intentional - it just seems like part of the
giant python disaster the packagers have created for themselves...

> 
> Anyway, this seems to work, so
> 
>   Reviewed-by: Andrea Bolognani <abologna at redhat.com>
> 
> -- 
> Andrea Bolognani / Red Hat / Virtualization

Regards,
Daniel
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