$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-libmaxminddb.git /var/lib/mock/f40-build-779033-130154/root/chroot_tmpdir/scmroot/perl-Alien-libmaxminddb
Cloning into '/var/lib/mock/f40-build-779033-130154/root/chroot_tmpdir/scmroot/perl-Alien-libmaxminddb'...
$ git fetch origin 5d79e4e3945032e4bb618a901286074efcfb615c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Alien-libmaxminddb
 * [new ref]         5d79e4e3945032e4bb618a901286074efcfb615c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d79e4e Update to 1.014 (rhbz#2260628)