Rewrite bin/hey in ruby
Because bash is a pain at this (and planned) levels of complexity.
Also, better auto-documentation on 'hey {h,help,-h,--help}'
This commit is contained in:
Henrik Lissner
parent
66868d48ac
commit
b155537219
554
bin/hey
554
bin/hey
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@ -1,230 +1,368 @@
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#!/usr/bin/env zsh
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#!/usr/bin/env cached-nix-shell
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#! nix-shell -p ruby -i "ruby -S" --quiet
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# I don't like the user story for Nix's binaries, unlike Guix's. So I wrote
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# this to abstract away the unneeded complexity for everyday maintenance of my
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# NixOS config.
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#
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# hey cd|check
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# nix flake check $DOTFILES
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# hey sh|show
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# nix flake show $DOTFILES
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# hey u|update [INPUT...]
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# nix flake update --recreate-lock-file $DOTFILES
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# hey re|rebuild [ARGS...]
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# nixos-rebuild --flake $DOTFILES#$HOST ${@:-build}
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# hey t|test -> nixos-rebuild --flake $DOTFILES#$HOST --fast test
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# hey theme $THEME -> THEME=$THEME hey test (quick theme swapping)
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# hey rollback -> hey rebuild --rollback switch
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# hey s|search -> nix search nixpkgs $@
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# hey swap $PATH -> swaps all specified nix-store symlinks (or recursively
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# in a specified directory) with copies so they can be
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# modified in place (while tweaking). Run again to
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# restore the old link (careful, you'll lose work if you
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# don't save your changes elsewhere!)
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# hey vm -> hey rebuild vm
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# hey up|upgrade -> hey update && hey rebuild switch
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# hey gc -> GC user profile, optimise nix store
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# sudo hey gc -> GC, optimise nix store, & delete old boot entries
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# hey push REMOTE -> 1. Build machine locally, 2. Copy result to remote, 3. Activate config on remote
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# hey gen|generations -> explore, manage, diff across generations (WIP)
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#
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# hey (with no sub-command) can also be used as an alternative to nix-env:
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#
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# hey -q
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# hey -iA nixos.htop
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# hey -e htop
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DESC = <<~DESC
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Nix's CLI has a poor user story, in my opinion. It could be better; Guix is a
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good role model here. I wrote this script to abstract the more common
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workflows, like rebuilding (nixos-rebuild), cleaning up (nix-collect-garbage),
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package/env management (nix-env), updating, rolling back, etc. As well as some
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utility operations (like managing generations, building remotely, or swapping
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themes on the fly).
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set -e
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if [[ -z $FLAKE ]]; then
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for dir in /etc/nixos /etc/dotfiles; do
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if [[ -f "$dir/flake.nix" ]]; then
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FLAKE=$dir
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break
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fi
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done
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fi
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Because I can go months without shaving yaks in NixOS, exact flags or details
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are often and easily forgotten. This spares me that fumbling phase and also
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serves as a reference.
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#
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function main {
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function _do { [[ $DRYRUN ]] && echo "$@" || "$@" }
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Note: `hey` can also be used as a shortcut for nix-env:
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### Helpers
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function _usage {
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echo "Usage: hey COMMAND [FLAGS...] [ARGS...]"
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echo
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echo "Available commands:"
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echo " check (ch) Same as 'nix flake check \$DOTFILES'"
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echo " gc Garbage collect and optimize store"
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echo " generations (gen) TODO"
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echo " push Push thie config to a remote NixOS system and rebuild it"
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echo " rebuild (re) Rebuild current system flake"
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echo " rollback Roll back to last generation"
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echo " search (s) Searches nixpkgs for a package"
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echo " show (sh) Same as 'nix flake show \$DOTFILES'"
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echo " swap Swap nix-store link (or directory thereof) for tweaking"
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echo " test (t) Quickly rebuild, for quick iteration"
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echo " theme Quickly swap to another theme"
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echo " upgrade (up) Update flake lockfile and rebuild"
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echo " vm Build flake into a VM image"
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}
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hey -q
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hey -iA nixos.htop
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hey -e htop
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DESC
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function _rebuild {
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# Move to $DOTFILES to prevent polluting the system with result links
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pushd $FLAKE >/dev/null
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# REVIEW Use --impure instead when it's in a stable release of nix
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_do ${SUDO:+sudo} nixos-rebuild \
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--flake "${FLAKE}#${HOSTNAME:-$HOST}" \
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--option pure-eval no \
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${@:-build}
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popd >/dev/null
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}
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require 'shellwords'
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require 'optparse'
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function _update {
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echo "Updating NixOS flake"
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if [[ "$@" ]]; then
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for flake in $@; do
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_do nix flake update --update-input "$flake" "$FLAKE"
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done
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module Hey
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extend self
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Command = Struct.new(:name, :desc, :args, :opts, :fn)
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@@opts = { flake: File.expand_path('../', File.dirname(__FILE__)) }
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@@alias = {}
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@@commands = {}
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@@cli = nil
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def self.defcmd names, &block
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names = (names.kind_of?(Array) ? names : [names]).map(&:to_s)
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names.drop(1).each { |n| @@alias[n] = names.first }
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cli = Command.new names.first, [], []
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cli.opts = OptionParser.new do |opt|
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opt.banner = "Usage: #{opt.program_name} #{cli.name} [options]"
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opt.separator "\nOptions:"
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opt.on_tail('-h', '--help', 'Prints this help') { puts opt; exit }
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end
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@@cli = cli
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fn = block.call cli
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cli.fn = lambda do |args|
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begin
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cli.opts.banner +=
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(cli.args ? " #{cli.args.join ' '}" : "") +
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(cli.desc ? "\n\n#{cli.desc[0]}\n\n#{cli.desc[1..].join "\n"}" : "")
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cli.opts.order!(args, into: @@opts)
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fn.call args
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ensure @@cli = nil end
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end
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@@commands[cli.name] = @@cli
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end
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def self.opts(*args) @@cli.opts.on(*args) end
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def self.args(*args) @@cli.args = args end
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def self.desc(*args) @@cli.desc = args end
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def self.sh(args, sudo: false, noerror: false)
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raise ArgumentError unless args.kind_of?(Array)
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args.unshift('sudo') if sudo
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if @@opts[:dryrun]
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print args.compact
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return true
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else
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_do nix flake update --recreate-lock-file "$FLAKE"
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fi
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}
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result = system "#{args.compact.shelljoin} 2>&1"
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noerror ? result : exit($?.exitstatus)
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end
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end
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def self.rebuild(*args, sudo: false)
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sh ["nixos-rebuild",
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"--flake", @@opts[:flake],
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"--option", "pure-eval", "no",
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*args], sudo: sudo
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end
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function _gc {
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if [[ $EUID == 0 ]]; then
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echo "Cleaning up your system..."
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_do nix-collect-garbage ${@:--d}
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_do nix-store --optimise
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#
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defcmd [:shell, :sh] do
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desc "Open a nix-shell with the dotfiles loaded"
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lambda do |args|
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sh ["nix", "develop", args.first || @@opts[:flake]]
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end
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end
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defcmd :repl do
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desc "Open a nix-repl with nixpkgs and dotfiles preloaded"
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lambda do |args|
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sh ["nix", "repl", @@opts[:flake], "<nixpkgs>", *args]
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end
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end
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defcmd [:check, :ch] do
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desc "Run 'nix flake check' on your dotfiles"
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lambda do |args|
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sh ["nix", "flake", "check", @@opts[:flake]]
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end
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end
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defcmd :show do
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desc "[ARGS...]", "Run 'nix flake show' on your dotfiles"
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lambda do |args|
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sh ["nix", "flake", "show", @@opts[:flake]]
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end
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end
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defcmd :theme do
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desc 'Quickly swap to another theme module'
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args "THEME_NAME"
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lambda do |args|
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ENV["THEME"] = args.shift
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rebuild "--fast", "test"
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end
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end
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defcmd [:test, :t] do
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desc "Quickly rebuild, for quick iteration"
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lambda do |args|
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rebuild "--fast", "test", *args
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end
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end
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defcmd [:rebuild, :re] do
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desc "Rebuild the current system's flake"
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opts '--build-host HOST', "TODO"
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opts '--target-host HOST', "TODO"
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opts '--host HOST', "TODO"
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opts '--user', "TODO"
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opts '--fast', "TODO"
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lambda do |args|
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Dir.chdir(@@opts[:flake]) do
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@@opts[:host] ||= ENV["HOST"] || `hostname`.rstrip
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args = ["switch"] unless args.length > 0
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rebuild(*(@@opts[:"build-host"] ? ["--build-host", @@opts[:"build-host"]] : []),
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*(@@opts[:"target-host"] ? ["--target-host", @@opts[:"target-host"]] : []),
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@@opts[:fast] ? "--fast" : nil,
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@@opts[:debug] ? "--show-trace" : nil,
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*args,
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sudo: !@@opts[:user])
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end
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end
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end
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defcmd :rollback do
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desc "Roll back to last generation"
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lambda do |_args|
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rebuild "--rollback", "switch"
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end
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end
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defcmd [:update, :u] do
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desc "Update specific flakes or all of them"
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args "[INPUT...]"
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lambda do |args|
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args.each do |flake|
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puts "Trying to update #{flake}..."
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sh ["nix", "flake", "update", "--update-input", flake, @@opts[:flake]]
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end.empty? and begin
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puts "Updating all flakes.."
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sh ["nix", "flake", "update", "--recreate-lock-file", @@opts[:flake]]
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end
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end
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end
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defcmd [:upgrade, :up] do
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desc "Update all flakes and rebuild system"
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lambda do |_args|
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update
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rebuild :switch
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end
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end
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defcmd [:search, :s] do
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desc "Search nixpkgs for a package"
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lambda do |args|
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sh ["nix", "search", "nixpkgs", *args]
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end
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end
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defcmd :swap do
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desc "Recursively swap nix-store links (or folders thereof) with copies.",
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"The purpose is so you can have copies of your dotfiles that can be modified in",
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"place (so you can iterate on them quickly instead of 'hey re'ing between",
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"changes). Run again to restore the old link(s).\n",
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"Warning: backup your copies, or they will be destroyed when restored!"
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args "PATH", "[PATHS...]"
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lambda do |args|
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for target in args
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if File.directory? target
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files = Dir.glob("#{target}/**/*.nix-store-backup")
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if files.length > 0
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puts "There are swapped files here. Unswapping!"
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call :swap, *files
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else
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puts "Swapping files in #{target}"
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call :swap, *(Dir.glob("#{target}/**/*")
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.select { |f| File.symlink? f }
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.select { |l| File.readlink(l).match '^/nix/store/' })
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end
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elsif File.file? "#{target}.nix-store-backup"
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puts "Unswapping #{target}"
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sh [:mv, '-i', "#{target}.nix-store-backup", target]
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elsif File.file? target
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puts "Swapping #{target}"
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sh [:mv, target, "#{target}.nix-store-backup"]
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sh [:cp, "#{target}.nix-store-backup", target]
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else
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puts "Not a valid target: #{target}"
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exit 1
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end
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end
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end
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end
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defcmd :gc do
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desc "Garbage collect & optimize nix store"
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opts "-a", "--all", "GC both the user and system profiles"
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opts "-s", "--system", "Only GC the system profile"
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lambda do |_args|
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if @@opts[:all] or not @@opts[:root]
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puts "Cleaning up your user profile..."
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sh %w{nix-collect-garbage -d}
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end
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if @@opts[:all] or @@opts[:system]
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puts "Cleaning up your system..."
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sh %w{nix-collect-garbage -d}, sudo: true
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sh %w{nix-store --optimise}, sudo: true
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# Clear out left-over secrets. The switch-to-configuration call below will
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# regenerate them.
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[[ -d /run/secrets ]] && _do rm -f /run/secrets/*
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if File.exists?("/run/secrets/*")
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sh %w{rm -rf /run/secrets/*}, sudo: true
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end
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# nix-collect-garbage is a Nix tool, not a NixOS tool. It won't delete old
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# boot entries until you do a nixos-rebuild (which means we'll always have
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# 2 boot entries at any time). Instead, we properly delete them by
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# reloading the current environment.
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_do nix-env --delete-generations old --profile /nix/var/nix/profiles/system
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_do /nix/var/nix/profiles/system/bin/switch-to-configuration switch
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else
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echo "Cleaning up your user profile..."
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_do nix-collect-garbage ${@:--d}
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fi
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}
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sh %w{nix-env --delete-generations old --profile /nix/var/nix/profiles/system}, sudo: true
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sh %w{/nix/var/nix/profiles/system/bin/switch-to-configuration switch}, sudo: true
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end
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end
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end
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function _swap {
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for target in $@; do
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if [ -d "$target" ]; then
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files=( "$target"/**/*.nix-store-backup )
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links=( $(find "$target" -type l) )
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if [[ "$files" ]]; then
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echo "There are swapped files here. Unswapping!"
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for file in $files[@]; do
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_swap "$link"
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done
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defcmd :ssh do
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desc "Run a Hey command on a remote NixOS system",
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"This command assumes that the remote system is built on these dotfiles, it is",
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"dangerous to do this if that isn't the case."
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args "HOST", "[COMMAND]"
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opts '--host HOST', "The nixos config to build and deploy to HOST"
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lambda do |args|
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target, command = args.take(2)
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if command.match /switch|test|boot/
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puts "Enabling root ssh access on #{target}. Enter root password for remote system:"
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if sh ["ssh", "-t", target,
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"sudo mkdir -p /root/.ssh && sudo cp -f ~/.ssh/authorized_keys /root/.ssh/"],
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noerror: true
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begin
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puts "Building #{target}"
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call "rebuild", ["--user",
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"--host", @@opts[:host] || target,
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"--build-host", "localhost",
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"--target-host", "root@#{target}",
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command || "test"]
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ensure
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puts "Undoing root ssh access on #{target}"
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sh ["ssh", "-t", "root@#{target}", "rm -f /root/.ssh/authorized_keys"]
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end
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end
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else
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echo "Swapping files in $target"
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for link in $links[@]; do
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if [[ "$(readlink $link)" == /nix/store/* ]]; then
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_swap "$link"
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fi
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done
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fi
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elif [ -f "$target.nix-store-backup" ]; then
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echo "Unswapping $target"
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_do mv -i "$target.nix-store-backup" "$target"
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elif [ -f "$target" ]; then
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echo "Swapping $target"
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_do mv "$target" "$target.nix-store-backup"
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_do cp "$target.nix-store-backup" "$target"
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else
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>&2 echo "Not a valid target: $target"
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command = "nix run github:hlissner/dotfiles -- #{command}"
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puts "Running '#{command}' on #{target}"
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sh ["ssh", "-t", target, command]
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end
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end
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end
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# TODO Generalize this to nix profiles
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defcmd [:generations, :gen] do
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desc "Explore, manage, diff across generations"
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opts '--diff FROM TO', "TODO"
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opts '-r', '--remove PROFILE', "TODO"
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lambda do |args|
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profile = "/nix/var/nix/profiles/system"
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case args.shift
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when "diff"
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from, to = *args
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if from == to
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puts "Comparing the same profile! Aborting..."
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exit 1
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fi
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done
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}
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###
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eval set -- $(getopt -n hey -o df:h:ieAqp -l dryrun,flake:,host: -- "$@")
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while :
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do
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case "$1" in
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-d|--dryrun) DRYRUN=1; shift ;;
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-f|--flake) FLAKE=$2; shift 2 ;;
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-h|--host) HOSTNAME=$2; shift 2 ;;
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-i|-A|-q|-e|-p) _do nix-env "$@"; exit 0 ;;
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--) shift; break ;;
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esac
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done
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if [[ ! -d $FLAKE ]]; then
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>&2 echo "Couldn't find flake.nix in $FLAKE"
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elsif [from, to].compact.select do |gen|
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File.exists? "#{profile}-#{gen}-link" or
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puts "Generation #{gen} does not exist!"
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end.length != [from, to].compact.length
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exit 2
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end
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from = from ? "#{profile}-#{from}-link" : profile
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to = to ? "#{profile}-#{to}-link" : profile
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fromDevs = `nix-store -q --references #{from}`.split
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toDevs = `nix-store -q --references #{to}`.split
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puts (fromDevs - toDevs).map { |d| "\e[31m-#{d}\e[0m" }
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puts (toDevs - fromDevs).map { |d| "\e[32m+#{d}\e[0m" }
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when /ls|list/
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sh ["nix-env", "--list-generations", "--profile", profile], sudo: true
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when "remove"
|
||||
sh ["nix-env", "--delete-generations", "--profile", profile, *args], sudo: true
|
||||
when "switch"
|
||||
puts "Targeted rollback not supported yet" # TODO Is this true?
|
||||
exit 1
|
||||
fi
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
cmd="$1"
|
||||
[[ $# > 0 ]] && shift
|
||||
case "$cmd" in
|
||||
sh|shell) _do nix develop "$FLAKE" "$@" ;;
|
||||
repl) _do nix repl "$FLAKE/flake.nix" "<nixpkgs>" "$@" ;;
|
||||
class UsageError < StandardError; end
|
||||
defcmd [:help, :h] do
|
||||
desc "Show usage information for this script or a subcommand"
|
||||
args "[SUBCOMMAND]"
|
||||
lambda do |args|
|
||||
raise UsageError unless args.first
|
||||
call args.first, ["-h", *args.drop(1)]
|
||||
end
|
||||
end
|
||||
|
||||
ch|check) _do nix flake check "$@" "$FLAKE" ;;
|
||||
sh|show) _do nix flake show "$@" "$FLAKE" ;;
|
||||
|
||||
theme) THEME="$1" SUDO=1 _rebuild --fast test ;;
|
||||
t|test) SUDO=1 _rebuild --fast test "$@" ;;
|
||||
re|rebuild) SUDO=1 _rebuild "${@:-switch}" ;;
|
||||
rollback) SUDO=1 _rebuild --rollback switch ;;
|
||||
vm) SUDO=1 _rebuild "$@" vm ;;
|
||||
|
||||
u|update) _update "$@" ;;
|
||||
up|upgrade) _update && SUDO=1 _rebuild switch ;;
|
||||
s|search) nix search nixpkgs "$@" ;;
|
||||
|
||||
swap) _swap "$@" ;;
|
||||
gc) _gc "$@" ;;
|
||||
push)
|
||||
target=$1
|
||||
cmd=${2:-test}
|
||||
echo "Enabling root ssh access on $target"
|
||||
if _do ssh -t "$target" "sudo mkdir -p /root/.ssh && sudo cp -f ~/.ssh/authorized_keys /root/.ssh/authorized_keys"; then
|
||||
trap '_do ssh -t "root@$target" "rm -f /root/.ssh/authorized_keys"' EXIT
|
||||
echo "Building $target ($cmd)"
|
||||
HOSTNAME="${HOSTNAME:-$target}" _rebuild \
|
||||
--build-host localhost \
|
||||
--target-host "root@$target" \
|
||||
$cmd
|
||||
echo "Undoing root ssh access on $target"
|
||||
fi
|
||||
;;
|
||||
|
||||
gen|generations)
|
||||
profile=/nix/var/nix/profiles/system
|
||||
case "$1" in
|
||||
switch) >&2 echo "Targeted rollback not supported yet" ;; # TODO Is this true?
|
||||
diff)
|
||||
to=/nix/var/nix/profiles/system-${2}-link
|
||||
diff \
|
||||
<(nix-store -q --references $profile) \
|
||||
<(nix-store -q --references $to)
|
||||
;;
|
||||
remove)
|
||||
shift
|
||||
_do sudo nix-env --delete-generations --profile $profile $@
|
||||
;;
|
||||
"")
|
||||
_do sudo nix-env --list-generations --profile $profile
|
||||
;;
|
||||
esac
|
||||
;;
|
||||
|
||||
h|help) _usage ;;
|
||||
"") _usage ;;
|
||||
*) if command -v hey-$cmd >/dev/null; then
|
||||
hey-$cmd $@
|
||||
#
|
||||
def self.call command, args
|
||||
cmd = command.to_s
|
||||
cmd = @@alias[cmd] while cmd and not @@commands.key?(cmd)
|
||||
if cmd
|
||||
@@commands[cmd].fn.call args
|
||||
elsif command
|
||||
puts "Couldn't recognize command '#{command}'"
|
||||
exit 1
|
||||
else
|
||||
echo "Couldn't find command: $cmd" 1>&2
|
||||
exit 1
|
||||
fi
|
||||
;;
|
||||
esac
|
||||
}
|
||||
raise UsageError
|
||||
end
|
||||
end
|
||||
|
||||
main "$@"
|
||||
def self.run args=[]
|
||||
opts = OptionParser.new do |opt|
|
||||
opt.banner = "Usage: hey [global-options] [command] [sub-options]\n\n" + DESC
|
||||
opt.separator "\n\nAvailable Commands:"
|
||||
opt.separator (@@commands.values
|
||||
.reject { |c| c.desc.empty? }
|
||||
.sort { |a,b| a.name <=> b.name }
|
||||
.map { |c| " %-18s %s\n" % ["#{c.name} #{@@alias.key(c.name)}",
|
||||
c.desc[0]]})
|
||||
opt.separator "\nOptions:"
|
||||
opt.on('-d', '--dryrun', "Don't change anything; preform dry run")
|
||||
opt.on('-D', '--debug', "Show trace on nix errors")
|
||||
opt.on('-f', '--flake URI', "Change target flake to URI")
|
||||
opt.on(*%w{-h --help}, "Display this help, or help for a specific command")
|
||||
opt.on(*%w{-i -A -q -e -p}, "Forward to nix-env") { sh ["nix-env", *ARGV]; exit }
|
||||
end
|
||||
opts.order!(args, into: @@opts)
|
||||
|
||||
begin
|
||||
args.unshift("help") if @@opts[:help]
|
||||
if args.length == 0
|
||||
puts "Error: No command specified!"
|
||||
puts
|
||||
raise UsageError
|
||||
else
|
||||
call args.first, args.drop(1)
|
||||
end
|
||||
rescue UsageError
|
||||
puts opts
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
Hey.run ARGV.dup
|
||||
|
|
|
|||
Loading…
Reference in a new issue