Neal, thanks for the warning. I found the thread of your discussion here
actually:
http://lists.fedoraproject.org/pipermail/devel/2012-February/162496.html
It's very interesting. My feeling would be that a PyPI fedora repository
would make the most sense - much like the current Fedora TexLive2012
testing repository - but obviously this is no small job.
"python setup.py install" doesn't have similar issues, I take it?
Mat
On 20/11/12 11:40, Neal Becker wrote:
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
<mailto: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
School of Engineering
The University of Edinburgh
Faraday Building
The King’s Buildings
Edinburgh EH9 3JL
Tel: +44 (0)131 650 5570
School fax: +44 (0)131 650 6554
mathew.top...@ed.ac.uk <mailto:mathew.top...@ed.ac.uk>
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The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.
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