$ git clone -n https://src.fedoraproject.org/rpms/tex-cjw.git /var/lib/mock/f45-build-36951-709/root/chroot_tmpdir/scmroot/tex-cjw
Cloning into '/var/lib/mock/f45-build-36951-709/root/chroot_tmpdir/scmroot/tex-cjw'...
$ git fetch origin 8cf12acbd607f4e3b2df38e1b09b2b64121db49d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tex-cjw
 * [new ref]         8cf12acbd607f4e3b2df38e1b09b2b64121db49d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8cf12ac Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild