nix-install

#!/bin/sh

# customized version of https://nixos.org/nix/install
# tested on CentOS 6.5 and Ubuntu 14.04

{ # Prevent execution if this script was only partially downloaded

unpack=nix-binary-tarball-unpack

require_util() {
    type "$1" > /dev/null 2>&1 || which "$1" > /dev/null 2>&1 ||
        oops "you do not have \`$1' installed, which i need to $2"
}

oops() {
    echo "$0: $@" >&2
    #rm -rf "$unpack" # XXX: to speed up subsequent install attempts
    echo leftovers: $unpack >&2
    exit 1
}

case "$(uname -s).$(uname -m)" in
    Linux.x86_64) system=x86_64-linux;;
    Linux.i?86) system=i686-linux;;
    Darwin.x86_64) system=x86_64-darwin;;
    *) oops "sorry, there is no binary distribution of Nix for your platform";;
esac

url="https://nixos.org/releases/nix/nix-1.10/nix-1.10-$system.tar.bz2"

require_util curl "download the binary tarball"
require_util bzcat "decompress the binary tarball"
require_util tar "unpack the binary tarball"

echo "unpacking Nix binary tarball for $system from \`$url'..."
if [ ! -d $unpack ]; then
    mkdir "$unpack" || oops "failed to create \`$unpack' directory"
    curl -O -L "$url" || oops "could not download \`$url'"
    tar xjf $(basename "$url") -C "$unpack" || oops "failed to unpack \`$url'"
fi

[ -e "$unpack"/*/install ] ||
    oops "installation script is missing from the binary tarball!"

sudo install -d /etc/nix
cat > /etc/nix/nix.conf << EOF
build-users-group =
EOF

sudo install -m 755 -o $USER -d /nix
"$unpack"/*/install
if [ $? -eq 0 ]; then
    rm -rf "$unpack"

    echo patching your default environment...
    echo 'export PATH=/nix/var/nix/profiles/default/bin:$PATH' | sudo tee /etc/profile.d/nix-adhoc.sh
    # ubuntu needs /etc/environment (see sshd pam policies):
    echo PATH="/nix/var/nix/profiles/default/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" | sudo tee /etc/environment
    sudo chmod +x /etc/profile.d/nix-adhoc.sh
fi

} # End of wrapping

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