Dynamically disabling/omitting Apache configuration directives (DRY) - apache

Question

I am working on a product that runs Apache, and i'm trying to make the configuration more DRY — right now there are many different vhost configs that get loaded in different situations but are 90% identical, and this is very tedious to deal with when a change needs made. I don't think Apache is really designed with this kind of dynamic environment in mind, but w/e, here i am anyway.
So i've first turned to environment variables — i have a small boot-strap script that determines the necessary configuration and dumps variables into /etc/apache2/envvars (which is loaded by apache2ctl and similar on Ubuntu). This allows me to do things like this:
envvars:
export MYKEY='/path/to/mykey'
export MYCERT='/path/to/mycert'
export MYBUNDLE='/path/to/mybundle'
vhost config:
SSLCertificateKeyFile ${MYKEY}
SSLCertificateFile ${MYCERT}
SSLCACertificateFile ${MYBUNDLE}
This works fine, but only as long as MYKEY, &al., are non-empty variables referencing non-empty files. In some configurations, for example, no CA bundle is required, so i tried just pointing MYBUNDLE to /dev/null. Apache considers this a 'syntax error' because /dev/null is an empty file, and refuses to start.
My question: Is there any way i can dynamically disable/omit configuration directives in the Apache config (based on environment variables or a similar mechanism) without having to maintain separate files for each possible scenario?
Alternative question: Is there any way i can provide an empty value/certificate to this particular directive (SSLCACertificateFile) in a manner that Apache won't consider invalid?
Ubuntu 12.04.5
Apache 2.2.22

Answer 1

Looks like what you want is a management tool for your configuration.
Now I'm not sure how often you deploy but you probably could make a script that generates your templates for you?
If you have a greater need, maybe consider automation software and use some kind of template? I'm thinking something like chef (https://www.chef.io/) or puppet (http://puppetlabs.com/) or ... They all support template and you can provide value based on environment / server / moods for the different values.