[issue22269] Resolve distutils option conflicts with priorities

[Steve Dower]

Steve Dower  added the comment:

Distutils is now deprecated (see PEP 632) and all tagged issues are being 
closed. From now until removal, only release blocking issues will be considered 
for distutils.

If this issue does not relate to distutils, please remove the component and 
reopen it. If you believe it still requires a fix, most likely the issue should 
be re-reported at https://github.com/pypa/setuptools

--
nosy: +steve.dower
resolution:  -> out of date
stage: patch review -> resolved
status: open -> closed

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[issue22269] Resolve distutils option conflicts with priorities

[László Kiss Kollár]

Change by László Kiss Kollár :


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nosy: +lkollar

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[issue22269] Resolve distutils option conflicts with priorities

[Nicholas Chammas]

Change by Nicholas Chammas :


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[issue22269] Resolve distutils option conflicts with priorities

[Piotr Dobrogost]

Changes by Piotr Dobrogost p...@bugs.python.dobrogost.net:


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nosy: +piotr.dobrogost

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[issue22269] Resolve distutils option conflicts with priorities

[Antoine Pitrou]

Antoine Pitrou added the comment:

I do think this needs fixing. It's just that the patch is non-trivial and 
someone must take the time to review it.
Also, the patch should add a unit test to avoid regressions.

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[issue22269] Resolve distutils option conflicts with priorities

[sorin]

sorin added the comment:

Can't we do something about this bug? I think that most python devs are 
ignoring the severity of this one, especially because it does break 
distribution of packages (or at least their testing)

On OS X the experience is awful as --user doesn't work at all and as a 
maintainer of many python packages I end-up with a case where installing 
packages for the current user doesn't work. It works well on all other 
platforms but not on OS X (when you have the brew python). 

We cannot really expect all the package developers to spend a lot of time 
creating new scenarios only for trying to bypass this bug.

For the sake of our Python users let's fix this and make the Python experience 
a good one, especially for people that do not have much experience with python.

Maybe Santa will get my message ;) Wish you happy holidays!

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nosy: +sorin

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[issue22269] Resolve distutils option conflicts with priorities

[Tim Smith]

Tim Smith added the comment:

Ping! Any chance for feedback here? This behavior took me by surprise again 
today. :)

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[issue22269] Resolve distutils option conflicts with priorities

[Terry J. Reedy]

Changes by Terry J. Reedy tjre...@udel.edu:


--
stage:  - patch review
versions:  -Python 3.1, Python 3.2, Python 3.3

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[issue22269] Resolve distutils option conflicts with priorities

[Min RK]

Min RK added the comment:

`--prefix` vs `--user` is the only conflict I have encountered, but based on 
the way it works, it could just as easily happen with any of the various other 
conflicting options in install (install_base, exec_prefix, etc.), though that 
might not be very common.

There is a general question: If a Python distributor wants sys.prefix and 
default install_prefix to differ, what's the right way to do it? Setting it in 
distutils.cfg makes sense other than the conflicting option issues. Could there 
be a special `default_prefix` key that gets used as the final fallback (end of 
install.finalize_unix)?

I would really like to avoid having a warning on every install, since warning 
suggests that something has been done incorrectly, which in turn suggests that 
`distutils.cfg` is the wrong place to set the install prefix.

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[issue22269] Resolve distutils option conflicts with priorities

[Tim Smith]

Changes by Tim Smith pythonb...@tim-smith.us:


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[issue22269] Resolve distutils option conflicts with priorities

[Antoine Pitrou]

Antoine Pitrou added the comment:

Hmm... if it's only about --prefix vs. --user, we could let --user take 
precedence and issue a warning instead of an error.

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[issue22269] Resolve distutils option conflicts with priorities

[Min RK]

New submission from Min RK:

Background:

Some Python distros (OS X, Debian, Homebrew, others) want the default 
installation prefix for packages to differ from sys.prefix. OS X and Debian 
accomplish this by patching distutils itself, with special cases like `if 
sys.prefix == '/System/Library/...': actually_do_something_else()`. Homebrew 
accomplishes this by writing a `distutils.cfg` with:

[install]
prefix = /usr/local

The distutils.cfg approach is certainly simpler than shipping a patch, but has 
its own problems, because distutils doesn't differentiate the *source* of 
configuration options when resolving conflicts. That means that you can't do 
`python setup.py install --user` because it fails with the error can't combine 
user with prefix, ... without also specifying `--prefix=''` to eliminate the 
conflict.

Proposal:

I've included a patch for discussion, which uses the fact that the option_dict 
tracks the source of each option, and keeps track of the load order of each. In 
the case of an option conflict, the option that came from the lower priority 
source is unset back to None. If they come from the same source, then the same 
conflict error message is displayed as before.

Even if this patch is rejected as madness, as I expect it might be, official  
recommendations on how to address the root question of `sys.prefix != 
install_prefix` would be appreciated.

--
components: Distutils
files: distutils_conflict.patch
keywords: patch
messages: 225843
nosy: dstufft, eric.araujo, minrk
priority: normal
severity: normal
status: open
title: Resolve distutils option conflicts with priorities
versions: Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5
Added file: http://bugs.python.org/file36459/distutils_conflict.patch

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