Pillow 5.4.0 cannot be installed on Termux

[valpogus]

What did you do?

pip3 install --upgrade Pillow

What did you expect to happen?

Pillow is upgraded to version 5.4.0

What actually happened?

running build_ext
Traceback (most recent call last):
File "", line 1, in
File "/data/data/com.termux/files/usr/tmp/pip-install-XXXXXXXX/pillow/setup.py", line 800, in
zip_safe=not (debug_build() or PLATFORM_MINGW), )
File "/data/data/com.termux/files/usr/lib/python3.7/site-packages/setuptools/init.py", line 143, in setup
return distutils.core.setup(**attrs)
File "/data/data/com.termux/files/usr/lib/python3.7/distutils/core.py", line 148, in setup
dist.run_commands()
File "/data/data/com.termux/files/usr/lib/python3.7/distutils/dist.py", line 966, in run_commands
self.run_command(cmd)
File "/data/data/com.termux/files/usr/lib/python3.7/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/data/data/com.termux/files/usr/lib/python3.7/site-packages/setuptools/command/install.py", line 61, in run
return orig.install.run(self)
File "/data/data/com.termux/files/usr/lib/python3.7/distutils/command/install.py", line 545, in run
self.run_command('build')
File "/data/data/com.termux/files/usr/lib/python3.7/distutils/cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "/data/data/com.termux/files/usr/lib/python3.7/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/data/data/com.termux/files/usr/lib/python3.7/distutils/command/build.py", line 135, in run
self.run_command(cmd_name)
File "/data/data/com.termux/files/usr/lib/python3.7/distutils/cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "/data/data/com.termux/files/usr/lib/python3.7/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/data/data/com.termux/files/usr/lib/python3.7/distutils/command/build_ext.py", line 339, in run
self.build_extensions()
File "/data/data/com.termux/files/usr/tmp/pip-install-XXXXXXXX/pillow/setup.py", line 416, in build_extensions
for dirname in _find_library_dirs_ldconfig():
TypeError: 'NoneType' object is not iterable

What are your OS, Python and Pillow versions?

• OS: Termux
• Python: 3.7.2
• Pillow: 5.4.0

I think the error happens in the function _find_library_dirs_ldconfig, where the executable "/sbin/ldconfig" is called. This executable does not exist on Termux, making the function return None.

[...]
        args = ['/sbin/ldconfig', '-p']
[...]
    null = open(os.devnull, 'wb')
    try:
        with null:
            p = subprocess.Popen(args,
                                 stderr=null,
                                 stdout=subprocess.PIPE,
                                 env=env)
    except OSError:  # E.g. command not found
        return None
[...]

Previous versions can be installed without a problem (as long as the necessary dev packages are installed).

[hugovk]

_find_library_dirs_ldconfig was added in #3245.

@pslacerda, please could you check it?

[pslacerda]

@valpogus your development environment should be very funny: Termux on Android on Linux with some hardware virtualization!

@hugovk I'm looking it right now and ping you back soon.

[pslacerda]

_find_library_dirs_ldconfig should return a empty list instead of None, so it can go through Termux/ANDROID_ROOT code. Or return a generator instead.

I'm worried about /include for Termux (the comments talk about) that I don't see even before the introduction of _find_library_dirs_ldconfig. Maybe I missed something.

[wiredfool]

Initial termux support was done on a chromebook in the termux environment. It's possible that this can be tested in termux on docker.

[pslacerda]

Such a rare OS! I managed to install Pillow on #3529. It was developed on an Android phone because was simple to fix. Only python setup.py install was needed.

Tests on Docker seems very nice also.