$ git clone -n https://src.fedoraproject.org/rpms/xrestrict.git /var/lib/mock/f45-build-39152-732/root/chroot_tmpdir/scmroot/xrestrict
Cloning into '/var/lib/mock/f45-build-39152-732/root/chroot_tmpdir/scmroot/xrestrict'...
$ git fetch origin 3f975d107316b806bab2b2516cc3c47787205a9c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xrestrict
 * [new ref]         3f975d107316b806bab2b2516cc3c47787205a9c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f975d1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild