Panamax

First, configure rustup for Panamax:

echo "export RUSTUP_DIST_SERVER={{ host }}" >> ~/.bashrc
echo "export RUSTUP_UPDATE_ROOT={{ host }}/rustup" >> ~/.bashrc

source ~/.bashrc

Then, configure cargo for Panamax:

mkdir -p ~/.cargo

cat <<EOT > ~/.cargo/config
[source.panamax]
registry = "{{ host }}/git/crates.io-index"
[source.panamax-sparse]
registry = "sparse+{{ host }}/index/"

[source.crates-io]
# To use sparse index, change "panamax" to "panamax-sparse".
replace-with = "panamax"
EOT

Finally, run rustup-init, and you're done!

wget {{ host }}/rustup/dist/(replace with selected platform)/rustup-init
chmod +x rustup-init
./rustup-init