$ git clone -n https://src.fedoraproject.org/rpms/perl-MaxMind-DB-Reader-XS.git /var/lib/mock/f41-build-816810-150442/root/chroot_tmpdir/scmroot/perl-MaxMind-DB-Reader-XS
Cloning into '/var/lib/mock/f41-build-816810-150442/root/chroot_tmpdir/scmroot/perl-MaxMind-DB-Reader-XS'...
$ git fetch origin 5f2f4d9518add8856edd156307ab9a81d92d185a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-MaxMind-DB-Reader-XS
 * [new ref]         5f2f4d9518add8856edd156307ab9a81d92d185a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f2f4d9 Perl 5.40 rebuild