$ git clone -n https://src.fedoraproject.org/rpms/fatcat.git /var/lib/mock/f45-build-8690-394/root/chroot_tmpdir/scmroot/fatcat
Cloning into '/var/lib/mock/f45-build-8690-394/root/chroot_tmpdir/scmroot/fatcat'...
$ git fetch origin 42fbddd91d89c7690c1941859a75a879beb544f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fatcat
 * [new ref]         42fbddd91d89c7690c1941859a75a879beb544f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42fbddd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild