On 27 April 2017 at 23:04, Daniel P. Berrange <berra...@redhat.com> wrote:
> On Thu, Apr 27, 2017 at 04:32:09PM +1000, Nick Coghlan wrote:
>> Their approach means that any harm caused by "sudo pip install X" can
>> subsequently be fully reversed by doing "sudo pip uninstall X".
>>
>> At this moment, this is NOT true for Fedora and derivatives. Instead,
>> the remediation step here is "sudo pip uninstall X && sudo dnf
>> reinstall <something>" where you have to:
>>
>> 1. Figure out what "<something>" needs to be
>> 2. Hope that whatever you broke didn't affect your ability to run
>> "sudo dnf reinstall"
>
> Yep, recovering the system python install to a pristine state after
> 'devstack' has done its stuff is very painful right now :-(
>
> devstack was originally written for Ubuntu systems, so I guess they
> don't suffer as much due to the Debian specific change you describe
> above.
>
> Which location takes priority in Debian if the same module is installed
> in both places ? The DPKG location, or the Pip location ? Presumably it
> would have to be the pip version that takes priority if you want it to
> be usable for updating the (likely older) distro provided versions.
Aye, /usr/local/lib has priority:
$ docker run --rm ncoghlan/debian-python python3 -m site
sys.path = [
'/',
'/usr/lib/python3.4',
'/usr/lib/python3.4/plat-x86_64-linux-gnu',
'/usr/lib/python3.4/lib-dynload',
'/usr/local/lib/python3.4/dist-packages',
'/usr/lib/python3/dist-packages',
]
USER_BASE: '/root/.local' (doesn't exist)
USER_SITE: '/root/.local/lib/python3.4/site-packages' (doesn't exist)
ENABLE_USER_SITE: True
User level package installs take priority over system level ones
(regardless of distro), so the current container build use case for
root level pip installations can typically be met equally well by
running as a non-root user inside the container and doing "pip install
--user ...". Unfortunately, as with the venv option, there are a *lot*
of container build scripts out there that don't do that :(
Cheers,
Nick.
--
Nick Coghlan | ncogh...@gmail.com | Brisbane, Australia
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