$ git clone -n https://src.fedoraproject.org/rpms/libwpe.git /var/lib/mock/f40-build-2228184-53069/root/chroot_tmpdir/scmroot/libwpe
Cloning into '/var/lib/mock/f40-build-2228184-53069/root/chroot_tmpdir/scmroot/libwpe'...
$ git fetch origin 185de91b338b0a0f245041883e63f1e60976a7b0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libwpe
 * [new ref]         185de91b338b0a0f245041883e63f1e60976a7b0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 185de91 No longer used by any Fedora packages