$ git clone -n https://src.fedoraproject.org/rpms/valgrind.git /var/lib/mock/f42-build-3356304-45027/root/chroot_tmpdir/scmroot/valgrind
Cloning into '/var/lib/mock/f42-build-3356304-45027/root/chroot_tmpdir/scmroot/valgrind'...
$ git fetch origin f8e8a8e29d11a79e1508b2f0bb1baacf03c12ac7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/valgrind
 * [new ref]         f8e8a8e29d11a79e1508b2f0bb1baacf03c12ac7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8e8a8e 3.24.0-5 - update split package Recommends/Requires