$ git clone -n https://src.fedoraproject.org/rpms/fakechroot.git /var/lib/mock/f45-build-8643-393/root/chroot_tmpdir/scmroot/fakechroot
Cloning into '/var/lib/mock/f45-build-8643-393/root/chroot_tmpdir/scmroot/fakechroot'...
$ git fetch origin 322934be5365194f76478167e1219f5202fd4091:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fakechroot
 * [new ref]         322934be5365194f76478167e1219f5202fd4091 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 322934b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild