fix readthedocs build

[gsemet]

{code}
git clone --no-single-branch --depth 50 https://github.com/Guake/guake.git .
git checkout --force origin/master
git clean -d -f -f
python3.7 -mvirtualenv /home/docs/checkouts/readthedocs.org/user_builds/guake/envs/latest
/home/docs/checkouts/readthedocs.org/user_builds/guake/envs/latest/bin/python -m pip install --upgrade --no-cache-dir pip setuptools
/home/docs/checkouts/readthedocs.org/user_builds/guake/envs/latest/bin/python -m pip install --upgrade --no-cache-dir mock==1.0.1 pillow==5.4.1 alabaster>=0.7,<0.8,!=0.7.5 commonmark==0.8.1 recommonmark==0.5.0 sphinx<2 sphinx-rtd-theme<0.5 readthedocs-sphinx-ext<2.2
/home/docs/checkouts/readthedocs.org/user_builds/guake/envs/latest/bin/python -m pip install --exists-action=w --no-cache-dir -r requirements-dev.txt
Obtaining file:///home/docs/checkouts/readthedocs.org/user_builds/guake/checkouts/latest (from -r requirements-dev.txt (line 13))
Installing build dependencies: started
Installing build dependencies: finished with status 'done'
Getting requirements to build editable: started
Getting requirements to build editable: finished with status 'done'
Preparing editable metadata (pyproject.toml): started
Preparing editable metadata (pyproject.toml): finished with status 'done'
Build backend does not support editables, falling back to setup.py egg_info.
Preparing metadata (setup.py): started
Preparing metadata (setup.py): finished with status 'error'
ERROR: Command errored out with exit status 1:
command: /home/docs/checkouts/readthedocs.org/user_builds/guake/envs/latest/bin/python -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/home/docs/checkouts/readthedocs.org/user_builds/guake/checkouts/latest/setup.py'"'"'; file='"'"'/home/docs/checkouts/readthedocs.org/user_builds/guake/checkouts/latest/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(file) if os.path.exists(file) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-c6e1ltqz
cwd: /home/docs/checkouts/readthedocs.org/user_builds/guake/checkouts/latest/
Complete output (31 lines):
/home/docs/checkouts/readthedocs.org/user_builds/guake/envs/latest/bin/python: No module named pip
Traceback (most recent call last):
File "/tmp/pip-build-env-abbrstqn/overlay/lib/python3.7/site-packages/setuptools/installer.py", line 75, in fetch_build_egg
subprocess.check_call(cmd)
File "/home/docs/.pyenv/versions/3.7.9/lib/python3.7/subprocess.py", line 363, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/home/docs/checkouts/readthedocs.org/user_builds/guake/envs/latest/bin/python', '-m', 'pip', '--disable-pip-version-check', 'wheel', '--no-deps', '-w', '/tmp/tmp970cgy9v', '--quiet', 'pbr']' returned non-zero exit status 1.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "", line 1, in
File "/home/docs/checkouts/readthedocs.org/user_builds/guake/checkouts/latest/setup.py", line 17, in
setuptools.setup(pbr=True)
File "/tmp/pip-build-env-abbrstqn/overlay/lib/python3.7/site-packages/setuptools/init.py", line 152, in setup
_install_setup_requires(attrs)
File "/tmp/pip-build-env-abbrstqn/overlay/lib/python3.7/site-packages/setuptools/init.py", line 147, in _install_setup_requires
dist.fetch_build_eggs(dist.setup_requires)
File "/tmp/pip-build-env-abbrstqn/overlay/lib/python3.7/site-packages/setuptools/dist.py", line 809, in fetch_build_eggs
replace_conflicting=True,
File "/tmp/pip-build-env-abbrstqn/overlay/lib/python3.7/site-packages/pkg_resources/init.py", line 768, in resolve
replace_conflicting=replace_conflicting
File "/tmp/pip-build-env-abbrstqn/overlay/lib/python3.7/site-packages/pkg_resources/init.py", line 1051, in best_match
return self.obtain(req, installer)
File "/tmp/pip-build-env-abbrstqn/overlay/lib/python3.7/site-packages/pkg_resources/init.py", line 1063, in obtain
return installer(requirement)
File "/tmp/pip-build-env-abbrstqn/overlay/lib/python3.7/site-packages/setuptools/dist.py", line 877, in fetch_build_egg
return fetch_build_egg(self, req)
File "/tmp/pip-build-env-abbrstqn/overlay/lib/python3.7/site-packages/setuptools/installer.py", line 77, in fetch_build_egg
raise DistutilsError(str(e)) from e
distutils.errors.DistutilsError: Command '['/home/docs/checkouts/readthedocs.org/user_builds/guake/envs/latest/bin/python', '-m', 'pip', '--disable-pip-version-check', 'wheel', '--no-deps', '-w', '/tmp/tmp970cgy9v', '--quiet', 'pbr']' returned non-zero exit status 1.

WARNING: Discarding file:///home/docs/checkouts/readthedocs.org/user_builds/guake/checkouts/latest. Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
{code}

[Davidy22]

So, pretty sure this is the problem:
/home/docs/checkouts/readthedocs.org/user_builds/guake/envs/latest/bin/python: No module named pip

I am somewhat curious how this suddenly stopped working a few years back, how did this script suddenly stop being able to install/detect pip on its own when it worked before? Well, I can't find these commands in this repo so I assume this is a script on the readthedocs account that you have or something and I can't fix this myself because I don't have access to it, but it looks like you just need to install pip before running the pip installs in this script.

[gsemet]

Probably the base docker image evolved. I guess a apt get install python3-pip can be enough.
That I can look at if I find time this week end…