[exim] if else statements in the config file

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Autor: Jason_Meers
Data:  
Dla: exim users
Temat: [exim] if else statements in the config file
Hi all,

I hoping to use a generic config on all of my boxes, but have the
ability to override settings on a individual server basis.
e.g. by having files like this in the /etc/exim/ directory

local_domains_global
local_domains_server1.example.com
local_domains_server2.example.com

And use a configuration like this:
=========================

prinary_hostname = server1.example.com
ENABLE_CUSTOM_LOCAL_DOMAINS = TRUE

.ifdef ENABLE_CUSTOM_LOCAL_DOMAINS
domainlist local_domains = /etc/exim/local_domains_$primary_hostname
.else
domainlist local_domains = /etc/exim/local_domains_global
.endif

==========================

On the assumption that the config will set local_domains from
/etc/exim/local_domains_server1.example
if I leave the config as-is

and would use
/etc/exim/local_domains_global
if I comment out
#ENABLE_CUSTOM_DOMAINS_TRUE = TRUE

1) Have I understood this correctly?

2) Can anybody suggest a better way?

3) In the docs (or section 4.3.7 in the second edition book) What is
meant by "macro is defined"?
Does it mean set to "true" or set to any value whatsoever.

Thanks, as always your help is much appreciated,

Jason_Meers
--
http://www.exim-new-users.co.uk