$ git clone -n https://src.fedoraproject.org/rpms/ykushcmd.git /var/lib/mock/f45-build-39286-733/root/chroot_tmpdir/scmroot/ykushcmd
Cloning into '/var/lib/mock/f45-build-39286-733/root/chroot_tmpdir/scmroot/ykushcmd'...
$ git fetch origin f66cdf2bc4b03b7c88f90e01d0941193b12d4fd6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ykushcmd
 * [new ref]         f66cdf2bc4b03b7c88f90e01d0941193b12d4fd6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f66cdf2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild