$ git clone -n https://src.fedoraproject.org/rpms/rust-fsio.git /var/lib/mock/f40-build-2232221-53326/root/chroot_tmpdir/scmroot/rust-fsio
Cloning into '/var/lib/mock/f40-build-2232221-53326/root/chroot_tmpdir/scmroot/rust-fsio'...
$ git fetch origin 523c204e9d889cba6301a0502405ebdbb315f908:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fsio
 * [new ref]         523c204e9d889cba6301a0502405ebdbb315f908 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 523c204 Initial package