Processing rc file - critical comment asked

I have already a solution for my problem, but I would be glad if some
kind
soul could have a look on it and give suggestion for improvement…

Problem: My application can be controled by a kind of “rc file”,
specifying
various options. The options are defined using the Ruby syntax for
defining
constants. For example:

Example rc file

TIMEOUT=130
LOGFILE=ENV[HOME]+"/tmp/appl.log"

There are many possible options, but of course not all of them need to
be specified.

My solution is basically to evaluate the option file and access the
constants. I am aware that this imposes a pretty high security risk,
since any Ruby code could be put into the rc file, but for my
application I can accept it - security is not a big issue in this
particular case.

An option is “set” by calling a certain function in my application.

Here is my code:

Evaluate RC file in the context of a module. The name of the

rc file is on variable rcfile.

eval(“module Rc\n”+File.read(rcfile)+"\nend")

Now set the options according to the RC file

Scheduler.setTimeout(Rc::TIMEOUT) if Rc.const_defined?(‘TIMEOUT’);
Logger.setLogFile(Rc::LOGFILE) if Rc.const_defined?(‘LOGFILE’);
… and so on

This works fine, but I don’t like it much. It is a lot of typing for
each option, and it is easy to make a typing error:

Ooops, typo (REMOTEHOST vs. REMOTE_HOST)

SshConnect.setHost(Rc::REMOTEHOST) if Rc.const_defined?(‘REMOTE_HOST’)

Any idea of how I could do it better?

Ronald

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