$ git clone -n https://src.fedoraproject.org/rpms/perl-DBD-MySQL.git /var/lib/mock/f41-build-852164-166259/root/chroot_tmpdir/scmroot/perl-DBD-MySQL
Cloning into '/var/lib/mock/f41-build-852164-166259/root/chroot_tmpdir/scmroot/perl-DBD-MySQL'...
$ git fetch origin 18e3e79b691035b948d7572f91926e5be4d22110:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DBD-MySQL
 * [new ref]         18e3e79b691035b948d7572f91926e5be4d22110 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18e3e79 5.008 bump (rhbz#2301565)