Installation script for Nix on ChromeOS

chromebook-nix.sh

#!/bin/sh

sudo mount -o remount,exec /tmp

if [ -x /usr/local/nixstrap/proot-x86_64 ] && [ -h ~/.nix-profile ]; then
  echo "Launching shell with nix-* tools!"
  exec /usr/local/nixstrap/proot-x86_64 -b /usr/local/nixstrap/nix-1.8-x86_64-linux:/nix bash --init-file ~/.nix-profile/etc/profile.d/nix.sh
fi

set -e
set -x

sudo mkdir -p /usr/local/nixstrap
sudo chown chronos:chronos /usr/local/nixstrap

cd /usr/local/nixstrap

NIX_TAR=nix-1.8-x86_64-linux.tar.bz2
wget -O $NIX_TAR http://hydra.nixos.org/build/17897595/download/1/$NIX_TAR
tar xvf $NIX_TAR
rm $NIX_TAR

wget -O proot-x86_64 http://static.proot.me/proot-x86_64
chmod u+x proot-x86_64

./proot-x86_64 -b nix-1.8-x86_64-linux:/nix /nix/install

set +x

echo "Installation successful."
echo "Run this script again to gain access to the Nix tools."

how about a variant for arm?

In the Pixelbook I get:

user@penguin:~$ ./chromebook-nix.sh 
mount: /tmp not mounted or bad option

       In some cases useful info is found in syslog - try
       dmesg | tail or so.
+ sudo mkdir -p /usr/local/nixstrap
+ sudo chown chronos:chronos /usr/local/nixstrap
chown: invalid user: ‘chronos:chronos’