registering packages in ghc using a directory of package files

[Duncan Coutts]

On Sun, 2006-03-12 at 21:41 +0000, Duncan Coutts wrote:

> I'm somewhat tempted to patch our current ghc to do this, it might be
> easier to get that working than to get our current hacks to work
> properly.

Attached is the current patch I'm testing.

It's pretty minimal. It doesn't convert everything over to use a
directory of .conf files. It just makes ghc and ghc-pkg look for
package.conf.d/*.conf in addition to the normal package.conf.

So in fact ghc-pkg still registers by modifying the global package.conf
file. It's just that this allows us to register without using ghc-pkg at
all and directly dropping a file into the right directory.

In fact in Gentoo we already have such a directory. We keep a .conf file
per package anyway since we need these to be able to re-register
packages if ghc is reinstalled. So I've tested it by just symlinking:

/usr/lib/ghc-6.4.1/package.conf.d -> /usr/lib/ghc-6.4.1/gentoo/

So far this seems to work. ghc-pkg reports all the installed packages
and ghci can still load them up.

Duncan
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