Race condition: Sage library now depends on pip

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(We might in the future allow to use a system-wide pip though, but that requires changing configure[.ac] as well.)

[sagelib-7.4.beta2] Building interpreters for fast_callable
[sagelib-7.4.beta2] python -u setup.py install
[sagelib-7.4.beta2] ************************************************************************
[sagelib-7.4.beta2] Traceback (most recent call last):
[sagelib-7.4.beta2]   File "setup.py", line 47, in <module>
[sagelib-7.4.beta2]     from module_list import ext_modules, library_order, aliases
[sagelib-7.4.beta2]   File "/home/agag/sbrandhorst/sage/sage/src/module_list.py", line 150, in <module>
[sagelib-7.4.beta2]     from sage_setup.optional_extension import OptionalExtension
[sagelib-7.4.beta2]   File "/home/agag/sbrandhorst/sage/sage/src/sage_setup/optional_extension.py", line 24, in <module>
[sagelib-7.4.beta2]     all_packages = list_packages(local=True)
[sagelib-7.4.beta2]   File "/home/agag/sbrandhorst/sage/sage/src/sage/misc/package.py", line 211, in list_packages
[sagelib-7.4.beta2]     installed = installed_packages()
[sagelib-7.4.beta2]   File "/home/agag/sbrandhorst/sage/sage/src/sage/misc/package.py", line 293, in installed_packages
[sagelib-7.4.beta2]     installed.update(pip_installed_packages())
[sagelib-7.4.beta2]   File "/home/agag/sbrandhorst/sage/sage/src/sage/misc/package.py", line 147, in pip_installed_packages
[sagelib-7.4.beta2]     proc = subprocess.Popen(["pip", "list"], stdout=subprocess.PIPE)
[sagelib-7.4.beta2]   File "/home/agag/sbrandhorst/sage/sage/local/lib/python/subprocess.py", line 710, in __init__
[sagelib-7.4.beta2]     errread, errwrite)
[sagelib-7.4.beta2]   File "/home/agag/sbrandhorst/sage/sage/local/lib/python/subprocess.py", line 1335, in _execute_child
[sagelib-7.4.beta2]     raise child_exception
[sagelib-7.4.beta2] OSError: [Errno 2] No such file or directory
[sagelib-7.4.beta2] ************************************************************************
[sagelib-7.4.beta2] Error building the Sage library
[sagelib-7.4.beta2] ************************************************************************
[sagelib-7.4.beta2] Please email sage-devel (http://groups.google.com/group/sage-devel)
[sagelib-7.4.beta2] explaining the problem and including the relevant part of the log file
[sagelib-7.4.beta2]   /home/agag/sbrandhorst/sage/sage/logs/pkgs/sagelib-7.4.beta2.log
[sagelib-7.4.beta2] Describe your computer, operating system, etc.
[sagelib-7.4.beta2] ************************************************************************
[sagelib-7.4.beta2] make[3]: *** [sage] Error 1
[sagelib-7.4.beta2] make[3]: Leaving directory `/home/agag/sbrandhorst/sage/sage/src'
[sagelib-7.4.beta2]
[sagelib-7.4.beta2] real    0m27.900s
[sagelib-7.4.beta2] user    0m17.900s
[sagelib-7.4.beta2] sys    0m4.588s
make[2]: *** [sagelib] Error 2
make[2]: Leaving directory `/home/agag/sbrandhorst/sage/sage/build/make'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/agag/sbrandhorst/sage/sage/build/make'

real    303m54.652s
user    113m57.245s
sys    23m9.735s
***************************************************************
Error building Sage.

Cf. my post to sage-release, as well as the original report on sage-devel (of September 2nd).

Component: build

Keywords: build error, OSError, Popen, optional_extension, list_packages

Author: Leif Leonhardy

Branch/Commit: cf54771

Reviewer: Volker Braun

Issue created by migration from https://trac.sagemath.org/ticket/21403

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New commits:

cf54771

Trac #21403: Race condition: Sage library now depends on pip -- add dependency

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Branch: u/leif/sagelib_depends_on_pip

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Commit: cf54771

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Author: Leif Leonhardy

[vbraun]

Reviewer: Volker Braun

[vbraun]

Changed branch from u/leif/sagelib_depends_on_pip to cf54771