[asterisk-users] Parameterize asterisk config files

[Steve Edwards]

On Tue, 2 Oct 2012, Mitch Claborn wrote:

> I'd like to be able to use the same config files in CVS and have the 
> differences resolved at run time, based on host name of the asterisk 
> server.
>
> Another idea would be to write a simple perl or other program to 
> pre-process the files and put some markers in the files themselves.

I don't use CVS, old bad habits die hard :)

I use a preprocessor. Specifically:

http://git.dyne.org/freej/plain/lib/javascript/config/preprocessor.pl

(Not where I got it from, but it's the same file.)

because it had enough features and because my production hosts already 
have Perl so I didn't have to add yet another scripting language.

This preprocessor allows you to do '#if HOSTNAME==v0' where HOSTNAME is a 
shell environment variable or it can be defined on the command line.

You can also define variables in an 'include' file

It will do a whole lot more, but 'if' and substitution were the only
features I needed at the time. If I could have deciphered 'm4' I might 
have used that, but the sendmail.mc files look too damn ugly to maintain.

I hacked in CURDATE and CURTIME as 'pre-defined variables'.

Here's a sample of one of my files:

#
#       Filename:       /source/src/${PROJECT}/manager.conf.pre
#
#       Version:        001
#
#       Edit date:      2008-12-02
#
#       Facility:       Asterisk
#
#       Abstract:       Define connections to the manager interface.
#
#       Environment:    Asterisk
#
#       Author:         Steven L. Edwards
#
#       Modified by
#
#       000     2008-10-17      SLE     Started documenting.
#       001     2008-12-02      SLE     Preprocessorize.
#expand ; Created by makefile on __CURDATE__ at __CURTIME__
#expand ; from __FILE__

[general]
         enabled                         = yes
         port                            = 5038
#if     HOSTNAME==v0
         bindaddr                        = 127.0.0.1
#else
         bindaddr                        = 0.0.0.0
#endif

[@AMI_USERNAME@]
         deny                            = 0.0.0.0/0.0.0.0
#if     HOSTNAME==v0
         permit                          = 127.0.0.1/255.255.255.255
#else
         permit                          = 192.168.0.0/255.255.255.0
#endif
         read                            = all
         secret                          = @AMI_SECRET@
         write                           = all

; (end of /etc/asterisk/manager.conf)
# (end of /source/src/${PROJECT}/manager.conf.pre)

This gets munged by my makefile so deployment consists of 'make rsync;
make config'

-- 
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                              Fax: +1-760-731-3000