Install Nix on 64-bit Ubuntu

install-nix.sh

#!/bin/sh

set -e

# Install the binary tarball...
cd /
wget -O - http://hydra.nixos.org/job/nix/trunk/binaryTarball.x86_64-linux/latest/download | tar xvj
/usr/bin/nix-finish-install
rm /usr/bin/nix-finish-install

# Setup multiuser

# Allow all users to create profiles
mkdir -p /nix/var/nix/profiles/per-user
chmod 1777 /nix/var/nix/profiles/per-user

# Add build users
# 9 is the exit code when the group already exists
groupadd -r nixbld || [ "$?" -eq 9 ]
for n in 1 2 3 4 5 6 7 8 9 10; do
    useradd -c "Nix build user $n" -d /var/empty -g nixbld -G nixbld \
        -M -N -r -s `which nologin` nixbld$n || [ "$?" -eq 9 ]
done
chown root:nixbld /nix/store
chmod 1775 /nix/store
mkdir -p /etc/nix
grep -w build-users-group /etc/nix/nix.conf 2>/dev/null || echo "build-users-group = nixbld" >> /etc/nix/nix.conf
grep -w binary-caches /etc/nix/nix.conf 2>/dev/null || echo "binary-caches = http://cache.nixos.org" >> /etc/nix/nix.conf
grep -w trusted-binary-caches /etc/nix/nix.conf 2>/dev/null || echo "trusted-binary-caches = http://hydra.nixos.org http://builder.logicblox.com http://cache.nixos.org" >> /etc/nix/nix.conf

# Use a multiuser-compatible profile script
unlink /etc/profile.d/nix.sh
cat > /etc/profile.d/nix.sh <<EOF
if test -n "\$HOME"; then
    NIX_LINK="\$HOME/.nix-profile"

    if [ -w /nix/var/nix/db ]; then
        OWNS_STORE=1
    fi

    # Set the default profile.
    if ! [ -L "\$NIX_LINK" ]; then
        echo "creating \$NIX_LINK" >&2
        if [ -n "\$OWNS_STORE" ]; then
            _NIX_PROFILE_LINK=/nix/var/nix/nix/profiles/default
        else
            mkdir -p "/nix/var/nix/profiles/per-user/\$LOGNAME"
            _NIX_PROFILE_LINK="/nix/var/nix/profiles/per-user/\$LOGNAME/profile"
        fi
        ln -s "\$_NIX_PROFILE_LINK" "\$NIX_LINK"
    fi

    # Subscribe the root user to the Nixpkgs channel by default.
    if [ -n "\$OWNS_STORE" ] && [ ! -e "\$HOME/.nix-channels" ]; then
        echo "http://nixos.org/channels/nixpkgs-unstable nixpkgs" > "\$HOME/.nix-channels"
    fi

    # Set up nix-defexpr
    NIX_DEFEXPR="\$HOME/.nix-defexpr"
    if ! [ -e "\$NIX_DEFEXPR" ]; then
        echo "creating \$NIX_DEFEXPR" >&2
        mkdir -p "\$NIX_DEFEXPR"
        _NIX_CHANNEL_LINK=/nix/var/nix/profiles/per-user/root/channels/nixpkgs
        ln -s "\$_NIX_CHANNEL_LINK" "\$NIX_DEFEXPR"
    fi

    if [ -z "\$OWNS_STORE" ]; then
        export NIX_REMOTE=daemon
        export PATH="/nix/var/nix/profiles/default/bin:\$PATH"
    fi
    export PATH="\$NIX_LINK/bin:\$PATH"

    # Set up NIX_PATH
    export NIX_PATH="\${NIX_PATH:+\$NIX_PATH:}/nix/var/nix/profiles/per-user/\$LOGNAME/channels"
    unset OWNS_STORE
fi
EOF
cat >> /etc/environment <<EOF
PATH="\$PATH:/nix/var/nix/profiles/default/bin"
EOF

# Install upstart job
cat > /etc/init/nix-daemon.conf <<EOF
description "Nix Daemon"
start on filesystem
stop on shutdown
respawn
env NIX_CONF_DIR="/etc/nix"
exec $(readlink -f /nix/var/nix/profiles/default/bin/nix-daemon) --daemon
EOF

# Start nix daemon
initctl start nix-daemon

# Update the nix channel
/nix/var/nix/profiles/default/bin/nix-channel --update

@zefhemel Why do you publish this crap?

Before you use a file (/etc/environment), make sure that you understand how it works, please.

https://help.ubuntu.com/community/EnvironmentVariables#A.2Fetc.2Fenvironment