$ git clone -n https://src.fedoraproject.org/rpms/rust-vm-memory.git /var/lib/mock/f40-build-1910996-25081/root/chroot_tmpdir/scmroot/rust-vm-memory
Cloning into '/var/lib/mock/f40-build-1910996-25081/root/chroot_tmpdir/scmroot/rust-vm-memory'...
$ git fetch origin d182dae68024e55a1d9167b56a0cbe027af9cf71:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vm-memory
 * [new ref]         d182dae68024e55a1d9167b56a0cbe027af9cf71 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d182dae Exclude 32 bit targets again; Fixes RHBZ#2268989