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Cross-platform way to get default directory for binary files like console scripts?

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  Cross-platform way to get default directory for binary files like console scripts? Piotr Dobrogost <p@google-groups-2014.dobrogost.net> - 2014-02-20 06:27 -0800
    Re: Cross-platform way to get default directory for binary files like console scripts? Ned Batchelder <ned@nedbatchelder.com> - 2014-02-20 10:11 -0500
    Re: Cross-platform way to get default directory for binary files like console scripts? Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-02-20 15:22 +0000
      Re: Cross-platform way to get default directory for binary files like console scripts? Piotr Dobrogost <p@google-groups-2014.dobrogost.net> - 2014-02-20 07:34 -0800
        Re: Cross-platform way to get default directory for binary files like console scripts? Ned Batchelder <ned@nedbatchelder.com> - 2014-02-20 10:42 -0500
          Re: Cross-platform way to get default directory for binary files like console scripts? Piotr Dobrogost <p@google-groups-2014.dobrogost.net> - 2014-02-20 07:55 -0800
        Re: Cross-platform way to get default directory for binary files like console scripts? Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-02-20 15:44 +0000
        Re: Cross-platform way to get default directory for binary files like console scripts? Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-02-20 15:55 +0000
        Re: Cross-platform way to get default directory for binary files like console scripts? Ned Batchelder <ned@nedbatchelder.com> - 2014-02-20 11:26 -0500
        Re: Cross-platform way to get default directory for binary files like console scripts? Piotr Dobrogost <p@google-groups-2014.dobrogost.net> - 2014-02-21 06:12 -0800

#66756 — Cross-platform way to get default directory for binary files like console scripts?

Hi!

Is there cross-platform way to get default directory for binary files (console scripts for instance) the same way one can use sys.executable to get path to the Python's interpreter in cross-platform way?

Context:
There's Python script which runs various tools like pip using subprocess and we would like to make sure we run tools that accompany Python's interpreter used to run this script. Please note that the script may be run from within virtualenv which had not been activated - ./venv/bin/python our_script.py


Regards,
Piotr Dobrogost

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#66758

On 2/20/14 9:27 AM, Piotr Dobrogost wrote:
> Hi!
>
> Is there cross-platform way to get default directory for binary files (console scripts for instance) the same way one can use sys.executable to get path to the Python's interpreter in cross-platform way?
>
> Context:
> There's Python script which runs various tools like pip using subprocess and we would like to make sure we run tools that accompany Python's interpreter used to run this script. Please note that the script may be run from within virtualenv which had not been activated - ./venv/bin/python our_script.py
>
>
> Regards,
> Piotr Dobrogost
>

Hi Piotr, we talked about this briefly in #python this morning.  I still 
don't quite understand why you are averse to activating the virtualenv. 
  It is designed to solve precisely this problem: create an environment 
that uses the natural OS tools (including PATH) to produce a consistent 
environment that works the way tools expect.

If you don't activate the virtualenv, then you can look for your Python 
executable using sys.executable, and see if the file you want to run is 
in that same directory.  I have no idea under what conditions that is 
the right or wrong answer, and I don't know what to do if the file 
you're looking for isn't in that directory.

Perhaps the shorter answer is, look in the Python executable directory, 
then look in the directories on PATH.

-- 
Ned Batchelder, http://nedbatchelder.com

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#66760

On 20 February 2014 14:27, Piotr Dobrogost
<p@google-groups-2014.dobrogost.net> wrote:
> Is there cross-platform way to get default directory for binary files (console scripts for instance) the same way one can use sys.executable to get path to the Python's interpreter in cross-platform way?
>
> Context:
> There's Python script which runs various tools like pip using subprocess and we would like to make sure we run tools that accompany Python's interpreter used to run this script. Please note that the script may be run from within virtualenv which had not been activated - ./venv/bin/python our_script.py

I'm not sure if I understand the question. Are you trying to find
where a script would go if it had been installed as a result of
'python setup.py install' or 'pip install ...'? If so there are
different places it could go depending not only on the system but also
how the packages were installed (e.g. --user).

You can find the default location in this roundabout way:

In [1]: from distutils.command.install import install

In [2]: from distutils.dist import Distribution

In [3]: c = install(Distribution())

In [4]: c.finalize_
c.finalize_options  c.finalize_other    c.finalize_unix

In [4]: c.finalize_options()

In [5]: c.insta
c.install_base       c.install_headers    c.install_lib
c.install_path_file  c.install_platlib    c.install_scripts
c.install_usersite
c.install_data       c.install_layout     c.install_libbase
c.install_platbase   c.install_purelib    c.install_userbase

In [5]: c.install_scripts
Out[5]: '/usr/local/bin'


Oscar

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#66762

On Thursday, February 20, 2014 4:22:53 PM UTC+1, Oscar Benjamin wrote:
> 
> I'm not sure if I understand the question. Are you trying to find
> where a script would go if it had been installed as a result of
> 'python setup.py install' or 'pip install ...'? 

> Yes.

> If so there are
> different places it could go depending not only on the system but also
> how the packages were installed (e.g. --user).

Right.

> You can find the default location in this roundabout way:
>
> (...)
> 
> In [5]: c.install_scripts
> Out[5]: '/usr/local/bin'

I think this is pretty much what I'm after, thanks.
I'm wondering if there's some API to get this info as what you showed is really roundabout way to achieve the goal...

Regards,
Piotr

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#66763

On 2/20/14 10:34 AM, Piotr Dobrogost wrote:
> On Thursday, February 20, 2014 4:22:53 PM UTC+1, Oscar Benjamin wrote:
>>
>> I'm not sure if I understand the question. Are you trying to find
>> where a script would go if it had been installed as a result of
>> 'python setup.py install' or 'pip install ...'?
>
>> Yes.
>
>> If so there are
>> different places it could go depending not only on the system but also
>> how the packages were installed (e.g. --user).
>
> Right.
>
>> You can find the default location in this roundabout way:
>>
>> (...)
>>
>> In [5]: c.install_scripts
>> Out[5]: '/usr/local/bin'
>
> I think this is pretty much what I'm after, thanks.
> I'm wondering if there's some API to get this info as what you showed is really roundabout way to achieve the goal...

As roundabout and advanced as that code is, it doesn't give the right 
answer for me.  It returns None.  On my Mac, after activating a virtualenv:

     Python 2.7.2 (default, Oct 11 2012, 20:14:37)
     [GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)] 
on darwin
     Type "help", "copyright", "credits" or "license" for more information.
     >>> from distutils.command.install import install
     >>> from distutils.dist import Distribution
     >>> c = install(Distribution())
     >>> c.install_scripts
     >>> c.install_scripts is None
     True
     >>> sys.executable
     '/usr/local/virtualenvs/studygroup/bin/python'
     >>> os.listdir(os.path.dirname(sys.executable))
     ['activate', 'activate.csh', 'activate.fish', 'activate_this.py', 
'easy_install', 'easy_install-2.7', 'pip', 'pip-2.7', 'python', 
'python2', 'python2.7']
     >>>


-- 
Ned Batchelder, http://nedbatchelder.com

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#66766

On Thursday, February 20, 2014 4:42:54 PM UTC+1, Ned Batchelder wrote:
> 
> As roundabout and advanced as that code is, it doesn't give the right 
> answer for me.  It returns None.

Indeed. I tried on Linux and got None both inside and outside virtualenv :(

Regards,
Piotr

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#66764

On 20 February 2014 15:34, Piotr Dobrogost
<p@google-groups-2014.dobrogost.net> wrote:
> On Thursday, February 20, 2014 4:22:53 PM UTC+1, Oscar Benjamin wrote:
>
>> You can find the default location in this roundabout way:
>
> I'm wondering if there's some API to get this info as what you showed is really roundabout way to achieve the goal...

There may be something that I don't know of. Distutils is generally
pretty clunky though if you're not trying to do one of the exact
things it was designed to do.


Oscar

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#66767

On 20 February 2014 15:42, Ned Batchelder <ned@nedbatchelder.com> wrote:
>
> As roundabout and advanced as that code is, it doesn't give the right answer
> for me.  It returns None.  On my Mac, after activating a virtualenv:
>
>     Python 2.7.2 (default, Oct 11 2012, 20:14:37)
>     [GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)] on
> darwin
>     Type "help", "copyright", "credits" or "license" for more information.
>     >>> from distutils.command.install import install
>     >>> from distutils.dist import Distribution
>     >>> c = install(Distribution())

You forgot to call  c.finalize_options() here which actually sets all
of these attributes.

>     >>> c.install_scripts
>     >>> c.install_scripts is None
>     True


Oscar

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#66771

On 2/20/14 10:55 AM, Oscar Benjamin wrote:
> On 20 February 2014 15:42, Ned Batchelder <ned@nedbatchelder.com> wrote:
>>
>> As roundabout and advanced as that code is, it doesn't give the right answer
>> for me.  It returns None.  On my Mac, after activating a virtualenv:
>>
>>      Python 2.7.2 (default, Oct 11 2012, 20:14:37)
>>      [GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)] on
>> darwin
>>      Type "help", "copyright", "credits" or "license" for more information.
>>      >>> from distutils.command.install import install
>>      >>> from distutils.dist import Distribution
>>      >>> c = install(Distribution())
>
> You forgot to call  c.finalize_options() here which actually sets all
> of these attributes.
>

Ah, good! Thanks!


-- 
Ned Batchelder, http://nedbatchelder.com

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#66833

On Thursday, February 20, 2014 4:34:25 PM UTC+1, Piotr Dobrogost wrote:
> 
> I'm wondering if there's some API to get this info as what you showed is really roundabout way to achieve the goal...

Turns out there is API for this - see thread on distutils-sig mailing list at https://mail.python.org/pipermail/distutils-sig/2014-February/023867.html

Regards,
Piotr Dobrogost

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