$ git clone -n https://src.fedoraproject.org/rpms/rust-scx_rusty.git /var/lib/mock/f40-build-782740-132275/root/chroot_tmpdir/scmroot/rust-scx_rusty
Cloning into '/var/lib/mock/f40-build-782740-132275/root/chroot_tmpdir/scmroot/rust-scx_rusty'...
$ git fetch origin 8923c54c7a8788379ad899b29d8a5cb2df075145:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-scx_rusty
 * [new ref]         8923c54c7a8788379ad899b29d8a5cb2df075145 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8923c54 Update to 0.5.4