scripts/sysinstall.py: fix recent failure on Github.

We need to use system packages for psutil and pillow, instead of `sudo pip
install`.

Author: julian-smith-artifex-com

scripts/sysinstall.py

@@ -235,8 +235,20 @@ def run(command, env_extra=None):
     if pip == 'sudo':
         log('## Installing Python packages required for building MuPDF and PyMuPDF.')
         #run(f'sudo pip install --upgrade pip') # Breaks on Github see: https://github.com/pypa/get-pip/issues/226.
+        # We need to install psutil and pillow as system packages, otherwise things like `import psutil`
+        # fail, seemingly because of pip warning:
+        #
+        #   WARNING: Running pip as the 'root' user can result in broken
+        #   permissions and conflicting behaviour with the system package
+        #   manager. It is recommended to use a virtual environment instead:
+        #   https://pip.pypa.io/warnings/venv
+        #
         names = test_py.wrap_get_requires_for_build_wheel(f'{__file__}/../..')
+        names = names.split(' ')
+        names = [n for n in names if n not in ('psutil', 'pillow')]
+        names = ' '.join(names)
         run(f'sudo pip install {names}')
+        run(f'sudo apt install python3-psutil python3-pillow')
 
     log('## Build and install MuPDF.')
     command = f'cd {mupdf_dir}'
@@ -345,7 +357,7 @@ def run(command):
     #
     log('## Run PyMuPDF pytest tests.')
     def run(command, env_extra=None):
-        return run_command(command, doit=pytest_do, env_extra=env_extra)
+        return run_command(command, doit=pytest_do, env_extra=env_extra, caller=1)
     import gh_release
     if pip == 'venv':
         # Create venv.
@@ -356,7 +368,11 @@ def run(command, env_extra=None):
         command += f' && pip install --upgrade {gh_release.test_packages}'
         run(command)
     elif pip == 'sudo':
-        run(f'sudo pip install --upgrade {gh_release.test_packages}')
+        names = gh_release.test_packages
+        names = names.split(' ')
+        names = [n for n in names if n not in ('psutil', 'pillow')]
+        names = ' '.join(names)
+        run(f'sudo pip install --upgrade {names}')
     else:
         log(f'Not installing packages for testing because {pip=}.')
     # Run pytest.
@@ -403,9 +419,9 @@ def run(command, env_extra=None):
     run(command, env_extra=dict(PYMUPDF_SYSINSTALL_TEST='1'))
 
 
-def run_command(command, capture=False, check=True, doit=True, env_extra=None):
+def run_command(command, capture=False, check=True, doit=True, env_extra=None, caller=0):
     if doit:
-        return pipcl.run(command, capture=capture, check=check, caller=2, env_extra=env_extra)
+        return pipcl.run(command, capture=capture, check=check, caller=caller+2, env_extra=env_extra)
     else:
         log(f'## Would have run: {command}', caller=2)