$ git clone -n https://src.fedoraproject.org/rpms/perl-IP-Geolocation-MMDB.git /var/lib/mock/f41-build-816575-150267/root/chroot_tmpdir/scmroot/perl-IP-Geolocation-MMDB
Cloning into '/var/lib/mock/f41-build-816575-150267/root/chroot_tmpdir/scmroot/perl-IP-Geolocation-MMDB'...
$ git fetch origin db25d79bfd63d74ee8517cfd85e1b52aadba0e52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IP-Geolocation-MMDB
 * [new ref]         db25d79bfd63d74ee8517cfd85e1b52aadba0e52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db25d79 Perl 5.40 rebuild