From: Damphyr <damphyr@...>
Date: 2003-04-09T06:03:24+09:00
Subject: Re: Call for standardised package installation procedure

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I admit I haven't the last four emails in this thread but I can't help=20
myself, I must butt in :)
If I remember correctly the whole thread started with a request for a=20
common way to install ruby programs/libraries.
As I mentioned before, having to little experience with C extensions I=20
will leave them out for the moment. I will start first with the pure=20
ruby libs that go into the site directory.
My impression is that high in the wish list (and helpful to most=20
newbies) would be a package that offers a unified and easy (if error=20
free or less error prone) way to put the ruby libraries where they belong.
That means put them in

CONFIG["sitedir"] or CONFIG["sitelibdir"] or CONFIG["sitearchdir"]
(taken from rbconfig.rb)
and make sure all require statements are fullfiled. For starters let the=20
user find and install the packages that are required.

Going one step further, it would be nice to have some tool that can=20
create such an install script for the developer.
That would be step one.
Step two can build on such a tool by making it "ruby repository" aware.=20
That, for me, means that such an autogenerated script looks for=20
repository support in the ruby installation and adds an entry (and such=20
a repository has a tool to query for already installed packages)
Having a clearly defined interface for these two would help OS package=20
maintainers to get the information they need to maintain ruby-package=20
distributions. I personally use Gentoo, Tom you can scream if I'm=20
talking rubish, and I don't think adapting an ebuild to pass data from a=20
ruby script to Portage is such a big deal - provided there is a unified=20
way to keep such information :). But, again, this would come as a third=20
step in my list.
Since the thread started I played around with a few ideas and put=20
together some code yesterday. Unfortunately I have not had the time to=20
complete the functionality, nor have I any way to host this ultra alpha=20
version so that you could look at it.
So I'll simply attach it to this email and whoever is interested can=20
take a look at it.
First let me say that I would like to take the time and check Minero=20
Aoki's setup.rb. Second, let's just say I'm too new with Ruby to be able=20
to write really effective code.
Third, here's the central idea for this:

It consists of two parts:
Part one is the creator:
Given a structure like the following:

/----src/
   |--doc/
   |--foo/

running the createinstall script with a package name parameter in / will=20
create a directory called distro that contains the above structure, so=20
we have
  /---src/
    |-doc/
    |-foo/
    |-distro/package
        		|----src/
        		|----doc/
        		|----bla/

Now, the ruby files are in src/ and the creator script has generated a=20
script called distro/rbinstall.rb
This rbinstall.rb has some command line parameters and essentially does=20
the following:
Checks in all files in /src for require statements and then traverses=20
the rubylib, archdir, sitearchdir, sitelibdir and sitedir directories=20
for .rb files that match the require parameters.
If everything found is matched then it copies the contents of src/ under
one of the sitearchdir, sitelibdir and sitedir directories depending on=20
what was specified in createinstall (dependencies for architecture=20
and/or version).

The way the rbinstall.rb script is generated is actually a hack:
The actual class, the script and the required module are put together=20
from files in the creatorinstall library (putting the module in the file=20
instead of require'ing it ensures it will be there, and it will be the=20
version the script expects it to be). The createinstall.rb just fills in=20
a "header" for the generated file with constants whose values are used=20
by the script file.

I have coded (more or less) the following:
(This is in no way complete - it's a day's coding with three weeks=20
experience in Ruby - feel free to deride/curse/roll eyes. This also=20
means that the code is in a look-but-don't-run state. I promise,=20
*really*, that I'll have a runable version by the end of the week,=20
unless I get booed by everyone in this list)

creator.rb:
This is the class that creates the distro directory and the installer=20
script. It is clever enough to look for it's own files (rbinstall.rb,=20
script.rb and requirements.rb) in the libraries or under the current=20
directory.

requirements.rb
This is a module that adds a method for finding the contents of require=20
statements in all files under a directory and a method for matching that=20
list from all files in the ruby libraries. Uses rbconfig.rb to find the=20
directories.

rbinstall.rb
This defines a class that does the basic install sequence (actually=20
copies the files :) ). I need to test it - didn't have enough time to=20
finish it yesterday.

script.rb
This is the part of the installer script that executes. Here are the=20
command line parameters defined and handled, the RBINSTALL class=20
instantiated etc. This needs a bit more work. It should use rbconfig.rb=20
to check  architecture and/or ruby version requirements

What's missing:

createinstaller.rb where the command line parameters are passed to the=20
creator class and everything is put together.
Nothing is tested, there is no documentation and I'm not even sure this=20
is proper ruby.

I am pretty confident that I can make this "self-hosting" from day one=20
(ok day three, days one and two are already gone :) ). This means that=20
this package can distribute and install itself.

What can be done:
Wow, after reading most of the thread I can imagine a lot of things, but=20
I will contain myself to the following:

*Extend the functionality to handle C extensions.
*Add support for a ruby repository (as a library withing this=20
package). 	   This can be easily made optional. When such functionality=20
is there, then we can also talk about a scheme for versioning packages.
*For missing requirements go to RAA and suggest packages for download.

Like I said, easy does it. For me the number one priority is to built a=20
tool that simplifies deployment within Ruby and then buildng on that to=20
add ways to be used by external tools.
Phew, that was a long email :P
V.-



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