[HTCondor-users] Handy trick for checking for Python module installation

[Michael Pelletier <Michael.V.Pelletier@xxxxxxxxxxxx>]

While this may be of limited use for Python on HTCondor with the availability of containerization tools, it may still come in handy:

-----
# Advertise HasTensorFlow Boolean if the module is installed
STARTD_CRON_JOBLIST                   = $(STARTD_CRON_JOBLIST) HasTensorFlow
STARTD_CRON_HASTENSORFLOW_MODE           = OneShot
STARTD_CRON_HASTENSORFLOW_RECONFIG_RERUN = True
STARTD_CRON_HASTENSORFLOW_EXECUTABLE     = /usr/bin/python
STARTD_CRON_HASTENSORFLOW_ARGS           = \
" -c 'import pkgutil; print(''HasTensorFlow = True\n--\n'' if pkgutil.find_loader(''tensorflow'') else '''')' "
-----

Note that the '' at ''HasTensorFlow are two single quotes, not a double quote.

The pkgutil trick can be used with any Python module, and the approach can be adapted to other system-provided capabilities like node-locked licenses or what have you.

Michael V. Pelletier
Information Technology
Digital Transformation & Innovation
Integrated Defense Systems
Raytheon Company