$ git clone -n https://src.fedoraproject.org/rpms/whatmask.git /var/lib/mock/f45-build-38357-723/root/chroot_tmpdir/scmroot/whatmask
Cloning into '/var/lib/mock/f45-build-38357-723/root/chroot_tmpdir/scmroot/whatmask'...
$ git fetch origin 9925aac64ba0011afb0d109118b392e84e3776e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/whatmask
 * [new ref]         9925aac64ba0011afb0d109118b392e84e3776e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9925aac Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild