chore: rewrite manage in bash

manage.sh

@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+function mk-nixos-cmd-args() {
+	hostname="$1"
+	pkgs=$(nix-instantiate --eval -E "let sources = import ./npins; in sources.nixpkgs.outPath" | tr -d '"')
+	args=(
+		"-I" "nixpkgs=$pkgs"
+		"-I" "nixos-config=./nix/configurations/$hostname.nix"
+		"--file" "./default.nix"
+		"--attr" "nixosConfigurations.$hostname"
+	)
+	echo "${args[@]}"
+}
+
+function wrapped-nixos-rebuild() {
+	hostname="$1"
+	action="$2"
+	# shellcheck disable=SC2046
+	nixos-rebuild "$action" $(mk-nixos-cmd-args "$hostname") --no-reexec
+}
+
+function wrapped-nixos-install() {
+	hostname="$1"
+	# shellcheck disable=SC2046
+	nixos-install $(mk-nixos-cmd-args "$hostname")
+}
+
+function help() {
+	cat <<EOF
+manage.sh
+
+manage.sh is a thin wrapper to make nixos-{install,rebuild} easier to use.
+Black lives matter. Trans rights are human rights. No nazi bullsh*t.
+
+Available commands:
+	os <hostname> <action>:	run perhost action with nixos-rebuild
+	install <hostname>:	run perhost action with nixos-install
+	--help:	show this help menu
+EOF
+}
+
+if [ $# -lt 1 ]; then
+	help
+	exit 1
+fi
+mode="$1"
+shift
+
+case $mode in
+os)
+	if [ $# -lt 2 ]; then
+		help
+		exit 1
+	fi
+	wrapped-nixos-rebuild "$1" "$2"
+	;;
+
+install)
+	if [ $# -lt 1 ]; then
+		help
+		exit 1
+	fi
+	wrapped-nixos-install "$1"
+	;;
+
+help | *)
+	help
+	;;
+esac