Feature Request: overrides

[allanjude]

A canonical way to have an included config file override the configuration of the existing config file

example:
the pkg(8) tool in FreeBSD gets its configuration from all of the files in /etc/pkg and /usr/local/etc/pkg

/etc/pkg/FreeBSD.conf:
FreeBSD: {
url: "pkg+http://pkg.FreeBSD.org/${ABI}/latest",
mirror_type: "srv",
signature_type: "fingerprints",
fingerprints: "/usr/share/keys/pkg",
enabled: yes
}

/usr/local/etc/pkg/repos/FreeBSD.conf:
FreeBSD: { enabled: no }

Results in a final config with the FreeBSD repo disabled.

This is a relatively simple example, and seems to already work in FreeBSD, but codifying this as a feature would be useful.

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