$ git clone -n https://src.fedoraproject.org/rpms/rust-aes-kw.git /var/lib/mock/f42-build-3252971-41225/root/chroot_tmpdir/scmroot/rust-aes-kw
Cloning into '/var/lib/mock/f42-build-3252971-41225/root/chroot_tmpdir/scmroot/rust-aes-kw'...
$ git fetch origin 1ff5af3ce751e206703ea520f6bed0dbda3e816b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-aes-kw
 * [new ref]         1ff5af3ce751e206703ea520f6bed0dbda3e816b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ff5af3 Initial packaging (rhbz#2328628)