$ git clone -n https://src.fedoraproject.org/rpms/valgrind.git /var/lib/mock/f40-build-804512-144543/root/chroot_tmpdir/scmroot/valgrind
Cloning into '/var/lib/mock/f40-build-804512-144543/root/chroot_tmpdir/scmroot/valgrind'...
$ git fetch origin 489c705d3f7f77c0e8319eb48533d6794dc53933:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/valgrind
 * [new ref]         489c705d3f7f77c0e8319eb48533d6794dc53933 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 489c705 3.22.0-7 - Add valgrind-3.22.0-gcc-builtin_strcmp-128-256-bit-vector.patch