Installing PostgreSQL 9.1 on RHEL 6.2 fails with 404

[Josh-Tilles]

The incorrect URL is that the crate attempts to curl is http://yum.pgrpms.org/reporpms/9.1/pgdg-rhel91-9.1-4.noarch.rpm. If I go to its parent directory then it seems like the correct URL should be http://yum.pgrpms.org/reporpms/9.1/pgdg-redhat91-9.1-5.noarch.rpm. The primary differences in the URLs are the version (incorrect: 9.1-4, expected: 9.1-5), and that Pallet constructs the URL by inserting "rhel" rather than "redhat".

Some things that might get complicated:

• Although Fedora and RHEL are both on 9.1-5, CentOS is still on 9.1-4. So it seems like the simple *pgdg-repo-versions* map might need to get more complicated to reflect the different :oss.
• I don't know where it's most appropriate to deal with the special case of :rhel to "redhat".

[Josh-Tilles]

I'll send a pull request with a solution soon. I just thought it would be a good idea to document the issue before trying to fix it because my attempt could be totally wrongheaded.