Armijn Hemel wrote:
hi Pjotr,
I don't know if setting search paths and environment variables and all
is possible with Ruby gems. Is there any easy documentation about it?
'gem help install' gives quite a few options - including --bindir and
--install-dir.
In the past we have used wrapper packages for this. It would work a bit
like this (but I don't know how it would impact Ruby things):
1 install a package with Nix
2 install addons
3 create an expression, which takes 1 and 2 as input and creates a
wrapper package, that combines the two packages, using environment
variables, search paths, and so on
That works if you know the package beforehand. I think we have to
deal with 'addons' users want to install later. Most high-level
languages support this type of system: python eggs, ruby gems, perl
cpan, R modules etc. etc. By default they will install in /nix/store
where the language interpreter is installed. This causes problems.
Hm. I disagree there, but yes, there should be some solution.
I think the right thing to do is modify these package managers to
support Nix.
Or provide good Nix expressions that can work with these package
managers. We do this with more things. Wrappers are often not too hard
to make.
The only other option is to allow 'addons' outside the store - as a
normal user would do under $HOME. However, how do we handle system
wide packages.
One policy would be to say:
- system wide: Use a Nix package
- user: Under $HOME
That is the lazy option ;-).
My problem is that I want to provide Ruby to biologists, and can not
support all GEMs they will think of.
I still think that a wrapper that is a combination of Ruby plus all the
gems you need for a certain package would be sufficient. Maybe we should
just sit together for a few hours to just see if we can get it fixed
without too much effort.
The problem with executable wrappers is that the don't scale: You need a
wrapper for every conceivable combination of GEMs/Eggs/whatever... which
is impractical.
Cheers,
--
Bardur Arantsson
<[EMAIL PROTECTED]>
The modern P4 system is like a young kid being forced to tow his
father, his grandfather, his great-grandfather, his great-great-
grandfather, his great-great-great-grandfather, some schmuck
named Sir Doink of York and a caveman named Ogg.
porkchop_d_clown @ http://kuro5hin.org
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