From: Brian Candler <B.Candler@...>
Date: 2002-11-16T09:53:15+09:00
Subject: Re: Exerb for Linux ?


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On Fri, Nov 15, 2002 at 12:49:52PM +0900, Francois GORET wrote:
> does somebody already developed an equivalent of windoze's Exerb project on 
> Linux ?
> I am in bad need of such a wrapper to make a single executable file for a Ruby 
> project, using MySQL and Ruby-Gnome, preferably statically linked... and I 
> don't want to recode everything in C++ !

Err, well you could always do something like the attached.

I don't see a good reason for doing this on a Unix system though. It doesn't
make your source code any safer (you could add scrambling but it would be
trivial to bypass); it won't be any quicker to start than
#!/usr/local/bin/ruby; and you end up with a 1.6MB binary for Hello World.

I suppose it makes it slightly harder for people to tamper with your
scripts, but IMO using file permissions is simpler and more effective :-)

Regards,

Brian.

P.S. I have a feeling that something is not being initialised correctly,
because calling ruby_options makes the script halt at that point until it
gets an EOF on stdin - so use this at your own risk and/or do some research
to find out what the problem is :-)

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/*
 * Compile this using something like the following:
 *    gcc -Wall -o myprog -static exerb.c -lruby -lm -lcrypt \
 *       -L/usr/local/lib/ruby/1.6/i386-freebsd4.6 \
 *       -I/usr/local/lib/ruby/1.6/i386-freebsd4.6
 * See: http://www.rubycentral.com/book/ext_ruby.html
 * and main.c from the ruby distribution
 */

static char *prog="
puts \"hello, world!\\n\";
puts \"the end\\n\";
";

#include "ruby.h"

int main(int argc, char *argv[])
{
	ruby_init();
	/* ruby_options(argc, argv); waits until EOF on stdin? */
	ruby_script("exerb");
	rb_eval_string(prog);
	return 0;
}

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