r259426:
Add a pkg(8) repository configuration file for cdrom-based package
installation.
As part of the 'pkg-stage' target, copy the configuration file
to the 'packages/repos/' directory on the DVD filesystem.
r259427:
Export 'REPOS_DIR' when the selected source medium for package
installation is cdrom. This enables bsdconfig(8) to make use
of the on-disc pkg(8) repository configuration, which fixes
package selection and installation from the dvd installer.
Sponsored by: The FreeBSD Foundation
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