$ git clone -n https://src.fedoraproject.org/rpms/perl-Geo-IP.git /var/lib/mock/f41-build-815824-149783/root/chroot_tmpdir/scmroot/perl-Geo-IP
Cloning into '/var/lib/mock/f41-build-815824-149783/root/chroot_tmpdir/scmroot/perl-Geo-IP'...
$ git fetch origin 768a8317e91e12094811d4a19dd5985549f9bdf5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Geo-IP
 * [new ref]         768a8317e91e12094811d4a19dd5985549f9bdf5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 768a831 Perl 5.40 rebuild