The problem is that pip packages something as a dir where easy_install
packages as a file, or vice-versa. Then when you update, cpio will fail
(doesn't know how to replace a dir with a file, or vice-versa). Next, the
entire installation will abort!!!! Leaving you with a mess.
I understand it's possible to manually then fix this mess using (some
obscure) yum incantations, but I don't recall what. Usually at this point
I wipe the disc.
This has happened to me multiple times on multiple machines, and was
discussed at some length on fedora-dev list maybe 1 year ago. The basic
message was that I shouldn't use pip to install into the system dirs. But
even using pip --user is not answer, because pip will see that e.g.,
matplotlib wants a newer version of pytz, and will attempt to remove the
system pytz (and fail and abort).
The only reliable approach is virtualenv. Not really very satisfactory.
On Tue, Nov 20, 2012 at 6:02 AM, Mathew Topper <mathew.top...@ed.ac.uk>wrote:
> Hi Neal,
>
> Is that due to conflicting package versions? I haven't suffered any
> particular issues like this yet, but it seems to me that pip would be
> improved if it interacted better with the environment it was in. How hard
> would it be to get pip to interact with yum and apt, for instance, to get
> valid binaries and/or devel files?
>
> I can't help thinking that Latex packaging is very similar, in that linux
> distributions often struggle to keep up, which I guess is why TexLive
> started.
>
> And then to complicate matters further, our sys admin said he didn't like
> pip as he would rather generate RPMs, in order that there is not a lot of
> work to do for system rebuilds in our labs. I found pypi2rpm, but that
> looks pretty bleeding edge and I think I'm getting out of my depth as a
> humble scientist.
>
> Mat
>
> On 19/11/12 12:59, Neal Becker wrote:
>
> Mathew Topper wrote:
>
>
> Hi,
>
> I'm interested to know why the pip package manager is not more widely
> supported for installation of python packages like matplotlib?
> Matplotlib seems to be particularly slowly updated in the Fedora
> repositories, for example, so I often find that a source installation is
> necessary. I know this isn't especially difficult for the experienced
> user, but surely using something like pip would make this process for
> accessible for all users of python packages, particularly those that do
> not receive much attention from the big distribution maintainers? Yet,
> pip doesn't get a mention on the installation documentation of
> matplotlib or many other python packs.
>
> I would love to hear anyone's thoughts on this matter.
>
> Many Thanks,
>
> Mat
>
> It is dangerous to use pip on fedora, it may result in your next attempt to
> update the system failing horribly.
>
> If you use it, try to install with --user. Unfortunately, this often won't
> work
> because pip will then complain when attempting to remove a system version of
> some dep.
>
>
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> --
> Dr. Mathew Topper
> Institute for Energy Systems
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> The University of Edinburgh
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> School fax: +44 (0)131 650 6554
> mathew.top...@ed.ac.uk
> http://www.see.ed.ac.uk
>
> The University of Edinburgh is a charitable body, registered in
> Scotland, with registration number SC005336.
>
>
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