[asterisk-users] Parameterize asterisk config files

[Andrew Latham]

On Tue, Oct 2, 2012 at 8:04 PM, Steve Edwards <asterisk.org at sedwards.com> wrote:
> 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


While we are at it, GIT, Python Fabric and sed balance out most of my
deployment needs.  There are other moving parts but those are my own
design...


-- 
~ Andrew "lathama" Latham lathama at gmail.com http://lathama.net ~