$ git clone -n https://src.fedoraproject.org/rpms/calibre.git /var/lib/mock/f38-build-721746-98617/root/chroot_tmpdir/scmroot/calibre
Cloning into '/var/lib/mock/f38-build-721746-98617/root/chroot_tmpdir/scmroot/calibre'...
$ git fetch origin 83b2ee2943814bdf9f0cf8ded539f941a913dc53:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/calibre
 * [new ref]         83b2ee2943814bdf9f0cf8ded539f941a913dc53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83b2ee2 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild