Add USAGE to public/install-nixos.sh

2 files changed, 67 insertions, 6 deletions

diff --git a/public/install-nixos.sh b/public/install-nixos.sh
index 311205f..f5bf321 100755
--- a/public/install-nixos.sh
+++ b/public/install-nixos.sh
@@ -1,9 +1,70 @@
 #!/usr/bin/env nix-shell
-#!nix-shell --pure -i bash -p bash jq envsubst
+#!nix-shell --pure -i bash -p bash jq envsubst wget
 # shellcheck shell=bash
 set -Eeuo pipefail
 
-# download nix files before starting
-# generate local nix-file: get input for hostName
+end="\033[0m"
+
+green() {
+  green_color="\033[0;32m"
+  echo -e "${green_color}${1}${end}"
+}
+
+yellow() {
+  yellow_color="\033[0;33m"
+  echo -e "${yellow_color}${1}${end}"
+}
+
+blue() {
+  blue_color="\033[0;34m"
+  echo -e "${blue_color}${1}${end}"
+}
+
+red() {
+  red_color="\033[0;31m"
+  echo -e "${red_color}${1}${end}"
+}
+
+usage() {
+  red "Missing input argument $1.\n"
+  cat <<EOF
+Usage:
+    install-nixos.sh <HOST_NAME> <DEVICE>
+
+      Arguments
+        HOST_NAME         The networking.hostName of the installation. Something like 'velhinho-nixos'.
+        DEVICE            The LUKS device where to install to. Use lsblk or similar tools to get it's name.
+
+Examples:
+    Download install-nixos.sh and run it with 'velhinho-nixos' as hostName and '/dev/sda3' as LUKS device:
+        wget -O- https://euandre.org/dotfiles/install-nixos.sh | sh -s velhinho-nixos /dev/sda3
+EOF
+}
+
+HOST_NAME="${1:-}"
+DEVICE="${2:-}"
+
+[[ -z "${HOST_NAME}" ]] && {
+  usage 'HOST_NAME'
+  exit 2
+}
+
+[[ -z "${DEVICE}" ]] && {
+  usage 'DEVICE'
+  exit 2
+}
+
+SERVER="https://euandre.org/dotfiles"
+
+yellow "Downloading Nix files..."
+TMP_DIR="$(mktemp -d)"
+wget -O "${TMP_DIR}/configuration.nix"          "${SERVER}/configuration.nix"
+wget -O "${TMP_DIR}/hardware-configuration.nix" "${SERVER}/hardware-configuration.nix"
+wget -O "${TMP_DIR}/template.nix"               "${SERVER}/template.nix"
+green "Done."
+
+export HOST_NAME
+export DEVICE
+envsubst < "${TMP_DIR}/template.nix" > /etc/nixos/local-configuration.nix
 
 # fdisk
diff --git a/public/template.nix b/public/template.nix
index b0da84f..5cfc9f8 100644
--- a/public/template.nix
+++ b/public/template.nix
@@ -1,6 +1,6 @@
 {
-  hostName = "$host_name";
-  luksDevice = "$device";
+  hostName = "$HOST_NAME";
+  luksDevice = "$DEVICE";
   passwordFile =
-  "/home/andreh/dev/libre/dotfiles/encrypted/$host_name/password-hash.txt";
+  "/home/andreh/dev/libre/dotfiles/encrypted/$HOST_NAME/password-hash.txt";
 }