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install_nix.sh
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install_nix.sh
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#!/usr/bin/env bash
# Do initial nix install if nix is not available in PATH
if ! command -v nix > /dev/null; then
sh <(curl -L https://nixos.org/nix/install) --daemon
# Source nix-daemon.sh to add nix to PATH
if [[ -e '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh' ]]; then
# Path doesn't exist in shellcheck CI container
# shellcheck source=/dev/null
. '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh'
fi
fi
# Figure out how many cores the system has, and set cache default
if [[ "$OSTYPE" == 'darwin'* ]]; then
NPROC=$(sysctl -n hw.physicalcpu)
ADMIN_GROUP="@admin"
elif [[ "$OSTYPE" == 'linux'* ]]; then
NPROC=$(nproc)
ADMIN_GROUP="@wheel @sudo"
fi
# Jobs = The number of different nix packages able to be built at the same time
# Cores = How many cores an individual job may use. This value is
# assigned to $NIX_BUILD_CORES within a nix build environment.
jobs=$((NPROC / 2)) # Use only half of cores for individual jobs
cores=4 # Just a good default for consumer hardware
# NOTE: This has the potential of over-subscribing cores by a factor of 2.
# Potential load = jobs * cores = (n/2) * 4 = 2n
# However, this is probably the best compromise as most builds are largely
# single threaded, with a few exceptions which are massively parrallel.
# Check if nix.conf contains a value, append a default if missing.
add_if_missing_in_nix_conf() {
local key="$1"
local value="$2"
if ! grep "$key" /etc/nix/nix.conf &> /dev/null; then
echo "/etc/nix/nix.conf is missing a value for ${key}. " \
"Appending '${key} = ${value}' to /etc/nix/nix.conf"
# make sure that user can write to file
if sudo test -w /etc/nix/nix.conf; then
echo "${key} = ${value}" | sudo tee -a /etc/nix/nix.conf &> /dev/null
else
# nix.conf is read only, which is true for NixOS
echo "Unable to write '${key} = ${value}' to nix.conf, " \
"please add the value to your nix.conf"
fi
fi
}
# Check if nix.conf is already configured for a given value.
add_if_missing_in_nix_conf "trusted-users" "${ADMIN_GROUP} ${USER}"
add_if_missing_in_nix_conf \
"experimental-features" "flakes nix-command"
add_if_missing_in_nix_conf "cores" "${cores}"
add_if_missing_in_nix_conf "max-jobs" "${jobs}"
# Ask user if they would like to use Powerline for bash prompt
SCRIPT_DIR=$(cd "$(dirname "$0")" || true; pwd -P)
# Build the nixified script which is aware of Powerline and dependencies
nix build "$SCRIPT_DIR"'/..#better-prompt'
# Source file to apply Powerline bootstrap logic
# shellcheck source=/dev/null
. "$(nix eval --raw "$SCRIPT_DIR"'/..#better-prompt.outPath')/bin/better-prompt"

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