$ git clone -n https://src.fedoraproject.org/rpms/xwm.git /var/lib/mock/f45-build-39177-732/root/chroot_tmpdir/scmroot/xwm
Cloning into '/var/lib/mock/f45-build-39177-732/root/chroot_tmpdir/scmroot/xwm'...
$ git fetch origin fbcf3b3dbd5216571d515d68023436969a5717c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xwm
 * [new ref]         fbcf3b3dbd5216571d515d68023436969a5717c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fbcf3b3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild