nix-bootstrap.sh

#!/bin/sh

if [ $# -gt 0 ]; then
    set -- sh
fi

# should download this in the future
# but the mirror is down
proot=$(dirname "$0")/proot-$(uname -p)
export PROOT_NO_SECCOMP=1

nixdir=$HOME/.nix

OLD_NIX_PATH=$NIX_PATH
# shellcheck disable=SC1090
if [ -e "$HOME/.nix-profile/etc/profile.d/nix.sh" ]; then .  "$HOME/.nix-profile/etc/profile.d/nix.sh"; fi
if [ -n "$OLD_NIX_PATH" ]; then NIX_PATH="$OLD_NIX_PATH"; fi

if [ -z "$IN_PROOT" ]; then
    export IN_PROOT=1

    if ! [ -d "$nixdir" ]; then
        mkdir -p "$nixdir"
        s=$(mktemp)
        curl https://nixos.org/nix/install -o "$s"
        $proot -b "$nixdir:/nix" "$0" sh "$s"
    fi

    $proot -b "$nixdir:/nix" "$0" "$@"

    export IN_PROOT=
    exit
elif [ $# -gt 0 ]; then
    exec "$@"
fi