Fix postgis2 installs, add release_version helper to main cookbook

[mage2k]

This is for DATA-287!

Emerge postgis manually

This avoids getting the binaries that may have been against the wrong Postgres
version. Still need to emerge gdal via binary.

some minor formatting cleanup

adding lib file to main cookbook with release_version helper function

use different gdal ebuild for pre/post stable-v4

[dennisjbell]

Eric,

Can you change release_version to distro, and use gentoo2009 vs gentoo12dot11 or similar -- the stable-v2/stable-v4 monikers are going to be phased out in the new year.

-Dennis

[mage2k]

Dennis,

So, this?

class Chef
  class Recipe
    def distro
      release = File.read('/etc/engineyard/release')
      return "gentoo12dot11" if release.to_i > 2009
      "gentoo2009"
    end
  end
end

[dennisjbell]

Erik,

That looks perfect, with the corresponding changes in the calls in cookbooks/postgresql9_extensions/recipes/ext_postgis2_install.rb to go along with it, of course.

Thanks,
-Dennis