$ git clone -n https://src.fedoraproject.org/rpms/gmsh.git /var/lib/mock/f40-build-792095-138075/root/chroot_tmpdir/scmroot/gmsh
Cloning into '/var/lib/mock/f40-build-792095-138075/root/chroot_tmpdir/scmroot/gmsh'...
$ git fetch origin b40eb58ce9992c35dfa41c7c0817053f9b73e250:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gmsh
 * [new ref]         b40eb58ce9992c35dfa41c7c0817053f9b73e250 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b40eb58 Add gmsh_uint64.patch