$ git clone -n https://src.fedoraproject.org/rpms/valgrind.git /var/lib/mock/f39-build-1628407-39450/root/chroot_tmpdir/scmroot/valgrind
Cloning into '/var/lib/mock/f39-build-1628407-39450/root/chroot_tmpdir/scmroot/valgrind'...
$ git fetch origin b0b6accc1282a11a37e5d0bac0e8826ca7a5d597:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/valgrind
 * [new ref]         b0b6accc1282a11a37e5d0bac0e8826ca7a5d597 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0b6acc delete valgrind-3.21.0-no-memcpy-replace-check.patch