0.33.7 has a new hard-requirement on the "optional" psutil package

[tgurr]

Description

Upgrade to 0.33.7

● synapse.service - Synapse Matrix homeserver
   Loaded: loaded (/usr/x86_64-pc-linux-gnu/lib/systemd/system/synapse.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Fri 2018-10-19 15:46:00 CEST; 3s ago
  Process: 28759 ExecStart=/usr/bin/python2.7 -m synapse.app.homeserver --config-path=/etc/synapse/homeserver.yaml (code=exited, status=1/FAILURE)
 Main PID: 28759 (code=exited, status=1/FAILURE)

Oct 19 15:46:00 host python2.7[28759]:     "__main__", fname, loader, pkg_name)
Oct 19 15:46:00 host python2.7[28759]:   File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
Oct 19 15:46:00 host python2.7[28759]:     exec code in run_globals
Oct 19 15:46:00 host python2.7[28759]:   File "/usr/x86_64-pc-linux-gnu/lib/python2.7/site-packages/synapse/app/homeserver.py", line 44, in <module>
Oct 19 15:46:00 host python2.7[28759]:     from synapse.app import _base
Oct 19 15:46:00 host python2.7[28759]:   File "/usr/lib/python2.7/site-packages/synapse/app/_base.py", line 20, in <module>
Oct 19 15:46:00 host python2.7[28759]:     import psutil
Oct 19 15:46:00 host python2.7[28759]: ImportError: No module named psutil
Oct 19 15:46:00 host systemd[1]: synapse.service: Main process exited, code=exited, status=1/FAILURE
Oct 19 15:46:00 host systemd[1]: synapse.service: Failed with result 'exit-code'.

See:

synapse/app/_base.py

import psutil

Steps to reproduce

• don't have the previously optional psutil dependency installed
• upgrade to 0.33.7
• try to start 0.33.7

Version information

• Homeserver: local

If not matrix.org:

• Version: 0.33.7
• Install method: package manager
• Platform: plain linux

[tgurr]

Duplicate of #4062