Stage 7: command-line helpers dsv, duser, dfw, dsys (0.5.0)

- das-helpers replaces the dsv package and adds shared functions in
  /usr/lib/das/helpers.sh (bilingual messages, sudo re-exec, prompts).
- dsv new creates a runit service (command, user, directory, environment,
  svlogd log) and checks it stays up; dsv rm deletes one not from a package.
- duser: list, add (installer groups, --admin, key, password), del, passwd,
  lock/unlock (key logins too), key add|list|rm, groups +/-.
- dfw: allow/deny/status/reload for the tcp_ports and udp_ports sets of the
  inet das table, kept in /etc/nftables.d/dfw.nft and checked with nft -c.
- dsys: info, hostname, timezone, locale, keymap.
- xtools-minimal on both images.
- nftables.conf no longer suggests restarting the nftables service: its
  finish script flushes the whole ruleset, fail2ban's and Docker's included.
- das-server-install 0.2.0 mentions the helpers when it finishes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

srcpkgs/das-helpers/files/dsv.bash-completion

@@ -0,0 +1,41 @@
+# bash completion for dsv
+# shellcheck shell=bash
+_dsv() {
+	local cur=${COMP_WORDS[COMP_CWORD]} cmd=${COMP_WORDS[1]:-}
+	if ((COMP_CWORD == 1)); then
+		mapfile -t COMPREPLY < <(compgen -W "list status enable disable start stop restart logs new rm help" -- "$cur")
+		return
+	fi
+	case $cmd in
+	enable)
+		# services that are not enabled yet
+		local all=() s
+		for s in /etc/sv/*/; do
+			s=${s%/}
+			s=${s##*/}
+			[[ -e /etc/runit/runsvdir/default/$s ]] || all+=("$s")
+		done
+		mapfile -t COMPREPLY < <(compgen -W "${all[*]}" -- "$cur")
+		;;
+	disable | start | stop | restart)
+		mapfile -t COMPREPLY < <(compgen -W "$(ls /etc/runit/runsvdir/default 2>/dev/null)" -- "$cur")
+		;;
+	new)
+		case ${COMP_WORDS[COMP_CWORD - 1]} in
+		--user) mapfile -t COMPREPLY < <(compgen -u -- "$cur") ;;
+		--dir) mapfile -t COMPREPLY < <(compgen -d -- "$cur") ;;
+		--cmd) mapfile -t COMPREPLY < <(compgen -c -- "$cur") ;;
+		--env) ;;
+		*) mapfile -t COMPREPLY < <(compgen -W "--cmd --user --dir --env --no-log --enable" -- "$cur") ;;
+		esac
+		;;
+	status | logs | log | rm)
+		if [[ $cmd == logs* ]] && ((COMP_CWORD == 3)); then
+			mapfile -t COMPREPLY < <(compgen -W "-f" -- "$cur")
+		else
+			mapfile -t COMPREPLY < <(compgen -W "$(ls /etc/sv 2>/dev/null)" -- "$cur")
+		fi
+		;;
+	esac
+}
+complete -F _dsv dsv