pgAgent + poetry run = job runs first time, but fails the second time

[jlayt]

I have PostgreSQL and pgAgent installed on a Debian server. I schedule a pgAgent job to run a step using Poetry as follows:

cd /srv/lib/myservice
poetry run /srv/lib/myservice/bin/myscript.py

This successfully ran the first time, but failed all runs after that. If I restart the systemd service for pgAgent, then the next run of the job succeeds, but subsequent runs fail again. I suspect there's some vestigial remains from the first Poetry run that causes the env to become messed up and no longer valid?

If I insert a "poetry env info" into that job script before poetry run, the first run after a restart reports a healthy env and runs the script, but the second failed run doesn't have any output at all.

If I try "poetry shell" instead, I get an error "(25, 'inappropriate ioctl for device')" and "python not found".

If I put in two 'poetry run' calls in the job script, then both run OK. It's only when a new job script run gets spawned that the failures occur.

Any suggestions on what might be going wrong here?