$ git clone -n https://src.fedoraproject.org/rpms/python-sphinx-last-updated-by-git.git /var/lib/mock/f45-build-33067-666/root/chroot_tmpdir/scmroot/python-sphinx-last-updated-by-git
Cloning into '/var/lib/mock/f45-build-33067-666/root/chroot_tmpdir/scmroot/python-sphinx-last-updated-by-git'...
$ git fetch origin 7110a1df0178e4b1b64bbfaa4db9f7b0d781c2d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-sphinx-last-updated-by-git
 * [new ref]         7110a1df0178e4b1b64bbfaa4db9f7b0d781c2d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7110a1d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild