$ git clone -n https://src.fedoraproject.org/rpms/valgrind.git /var/lib/mock/f42-build-side-1-3517633-46098/root/chroot_tmpdir/scmroot/valgrind
Cloning into '/var/lib/mock/f42-build-side-1-3517633-46098/root/chroot_tmpdir/scmroot/valgrind'...
$ git fetch origin 5aabba389f2c1d2f06bebe601e0699ce615eb646:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/valgrind
 * [new ref]         5aabba389f2c1d2f06bebe601e0699ce615eb646 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5aabba3 3.25.0-0.1.RC2