$ git clone -n https://src.fedoraproject.org/rpms/liblangtag.git /var/lib/mock/f45-build-16457-486/root/chroot_tmpdir/scmroot/liblangtag
Cloning into '/var/lib/mock/f45-build-16457-486/root/chroot_tmpdir/scmroot/liblangtag'...
$ git fetch origin b0bc8eb8a1d0480342181ffe7d4bf68de11cb58f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/liblangtag
 * [new ref]         b0bc8eb8a1d0480342181ffe7d4bf68de11cb58f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0bc8eb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild