$ git clone -n https://src.fedoraproject.org/rpms/wabt.git /var/lib/mock/f42-build-428-68/root/chroot_tmpdir/scmroot/wabt
Cloning into '/var/lib/mock/f42-build-428-68/root/chroot_tmpdir/scmroot/wabt'...
$ git fetch origin b0be39b23fd12b141ce948a221919ed89b544f28:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wabt
 * [new ref]         b0be39b23fd12b141ce948a221919ed89b544f28 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0be39b update to 1.0.37 (resolves rhbz#2349655)