bootstrap-iris-host

#!/usr/bin/env bash

# This script grabs the current configuration and hardware nix files
# on a new nixos system and puts them into a new iris repo host folder.
#
# Then it modifies the flake file to add a new nixos configuration, and
# finally it runs the new configuration so you're bootstraped with an
# iris environment.


# make sure the default configuration files exist
echo "Checking nixos config file existance:"

echo -en "/etc/nixos/configuration.nix\t\t"
if [[ -f "/etc/nixos/configuration.nix" ]]; then
  echo "PASS"
else
  echo "FAIL"
  exit 1
fi

echo -en "/etc/nixos/hardware-configuration.nix\t"
if [[ -f "/etc/nixos/configuration.nix" ]]; then
  echo "PASS"
else
  echo "FAIL"
  exit 2
fi

# get some info from the user
read -r -p "Configuration name: " config_name
read -r -p "System (x86_64-linux): " system
read -r -p "Unstable? [y/n]: " unstable
hostname=$(hostname)

if [[ "${system}" == "" ]]; then
  system="x86_64-linux"
fi

if [[ "${unstable}" != "y" && "${unstable}" != "n" ]]; then
  echo "Invalid stable/unstable option"
  exit 3
fi

# create the new host directory and copy in the configs
mkdir -p "hosts/${config_name}"
cp /etc/nixos/configuration.nix "hosts/${config_name}/default.nix"
cp /etc/nixos/hardware-configuration.nix "hosts/${config_name}"

# make sure the flake will see them!
git add "hosts/${config_name}/default.nix" "hosts/${config_name}"

# add a new configuration to flake.nix
if [[ "${unstable}" == "y" ]]; then
  sed -i "/nixosConfigurations = {/a\
  ${config_name} = mkSystem {\n\
  configName = \"${config_name}\";\n\
  hostname = \"${hostname}\";\n\
  system = \"${system}\";\n\
};\
  " flake.nix
else
  sed -i "/nixosConfigurations = {/a\
  ${config_name} = mkStableSystem {\n\
  configName = \"${config_name}\";\n\
  hostname = \"${hostname}\";\n\
  system = \"${system}\";\n\
};\
  " flake.nix
fi

# run the appropriate nixos-rebuild command
sudo nixos-rebuild switch --flake .\#"${config_name}"