$ git clone -n https://src.fedoraproject.org/rpms/rust-vm-memory.git /var/lib/mock/f38-build-side-42-init-devel-915733-28733/root/chroot_tmpdir/scmroot/rust-vm-memory
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-915733-28733/root/chroot_tmpdir/scmroot/rust-vm-memory'...
$ git fetch origin 662a1d9cdc1a140e101c31aa0ab96a6b0e41d19c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vm-memory
 * [new ref]         662a1d9cdc1a140e101c31aa0ab96a6b0e41d19c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 662a1d9 Update to version 0.10.0