$ git clone -n https://src.fedoraproject.org/rpms/valgrind.git /var/lib/mock/f42-build-side-1-3539449-46565/root/chroot_tmpdir/scmroot/valgrind
Cloning into '/var/lib/mock/f42-build-side-1-3539449-46565/root/chroot_tmpdir/scmroot/valgrind'...
$ git fetch origin 247872ecdc236f9e88cd44e040412a3fb6456505:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/valgrind
 * [new ref]         247872ecdc236f9e88cd44e040412a3fb6456505 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 247872e Valgrind 3.25.1 final