$ git clone -n https://src.fedoraproject.org/rpms/cm_rgb.git /var/lib/mock/f45-build-4224-331/root/chroot_tmpdir/scmroot/cm_rgb
Cloning into '/var/lib/mock/f45-build-4224-331/root/chroot_tmpdir/scmroot/cm_rgb'...
$ git fetch origin 2ed6ed91d9ecd4dbb38f2bcc08ef74d32688198d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cm_rgb
 * [new ref]         2ed6ed91d9ecd4dbb38f2bcc08ef74d32688198d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ed6ed9 move to fork of dead upstream