On 12/07/2016 02:47 PM, Konstantin Zemlyak wrote:
Michal Cyprian wrote:
there is a long-standing problem that `sudo pip install` cannot be
safely used in Fedora. Many users don't know about this and break
python packages on theirs systems. Packages installed using this
command can conflict and overwrite Python rpm packages.
This is a major problem and we have seen several systems broken by
people using "sudo pip". Unfortunately, telling people to not use it
will not work: "sudo pip" appears in documentation of too many
projects online.
The default install location of pip/distutils-installed packages
depends on the value of the
sys.prefix variable [4].
But this default can be trivially changed by distro.
There were several discussions on Bugzilla [1] and the pypa-dev
mailing list [2].
Interesting solutions were conceived at the CPython level:
- addition of sys.local_prefix [2]
- simplification of CPython startup sequence [4]
Unfortunately none of them were realized and both solutions require
many changes of Python and Python Standard Library.
But you don't need to do either.
One can probably either modify python package itself or create another
one with two files with following contents:
/usr/lib64/pythonX.Y/distutils/distutils.cfg:
[install]
install-lib = /usr/local/lib/pythonX.Y
/usr/lib64/pythonX.Y/sitecustomize.py:
import site
site.addsitedir('/usr/local/lib/pythonX.Y')
Or whatever custom-packages directory you want to redirect it to.
That's it. First file will change default location of installed
packages. Second one will add it to site dirs to support imports from
those local packages. Maybe sitecustomize.py will need few tweaks to
sitedirs order to make it work better.
This is documented in "legacy" section of python docs on distutils:
https://docs.python.org/3.5/install/#custom-installation
I'm not sure this would produce the desired effect, that is:
- system-python: installs to and imports only from /usr/lib*/pythonX.Y
- python3: installs to /usr/local/lib*/pythonX.Y but loads from both
/usr/... and /usr/local/...
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