$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-libmaxminddb.git /var/lib/mock/f40-build-2244945-53732/root/chroot_tmpdir/scmroot/perl-Alien-libmaxminddb
Cloning into '/var/lib/mock/f40-build-2244945-53732/root/chroot_tmpdir/scmroot/perl-Alien-libmaxminddb'...
$ git fetch origin e6afce1fdc430a64107db75897bf0affb4dedf61:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Alien-libmaxminddb
 * [new ref]         e6afce1fdc430a64107db75897bf0affb4dedf61 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6afce1 Update to 1.013 (fedora#2255697)