Expand arbitrary variables e.g. %(folder)s

[anuraguniyal]

Python ConfigParser allows variables to expand e.g. I usually use

[program:groupsafe_celery]
site_folder=/home/src/app
src_folder=/home/src/app/src
command=%(src_folder)s/manage.py celeryd --loglevel=INFO -f %(site_folder)s/log/celeryd.log -B -s %(site_folder)s/log/celerybeat-schedule

Which is very convenient and reduces error, but supervisord has its ownconfig parser UnhosedConfigParse which is devied from RawConfigParser and hence doesn't support such expansion, giving error like
Error: Format string '%(src_folder)s' for 'directory' contains names which cannot be expanded

Am I missing something. is it possible in supervisord?, if not I think it should be added

[mnaberez]

Sorry, no. Supervisor already uses the %()s syntax for its own expansions.

[anuraguniyal]

But it can be easily added IMO what is the harm in allowing such expansions?

[mnaberez]

We already use %()s for a different meaning in Supervisor, so we can't add these expansions without conflicting with the existing ones. Also I'd rather not have a syntax with two different meanings (the existing expansions, and a new type).