As far as users installing gems, they should be installing them
locally and not into the nix store, and the standard place to put them
is ~/.gems
% gem install [name of gem] --install-dir="$HOME/.gems"
% export GEM_PATH="$HOME/.gems"
As for system-wide gems, I wonder if it might not be appropriate to
add a configuration option to the ruby or gems package which lists a
set of gems to install, just as nixos has
"environment.extraPackages". The gems package could then install all
the necessary gems as the last step of its install process, and the
result would be unique to it's hash.
I'm thinking of this from a perspective of having web-development
testbeds, where it would be nice to have independent ruby packages
with, for example, different versions of rails or different sets of
gems installed and be able to select among them using a single
identifier.
Cheers,
--Aaron V.
On Aug 3, 2008, at 12:07, Michael Raskin wrote:
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Bárður Árantsson wrote:
|>> 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.
Well, you never need to have all wrappers created at once. You
generally
have no more than one per environment generated automatically, and
that
results in some sane amount of wrappers. Maybe add a few that are used
internally in some builds.
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