Add cachy-auto-update: unattended background updates for CachyOS
A root systemd service applies pacman, AUR, Flatpak and AppImage updates on its own, gated on battery state, gaming activity and whether anybody else is using the package system. The CLI is deliberately two switches plus status. No user password is stored anywhere: pacman runs as root directly, and the AUR step - which makepkg forbids running as root - drops to a locked system account that sudoers permits to call pacman without a password.
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# shellcheck shell=bash
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#
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# The interactive front end.
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#
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# This is the part the machine's owner actually sees, so it stays deliberately
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# small: two switches, a status block, and a way to look at what happened.
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CAU_UNIT="cachy-auto-update.timer"
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# _cau_row <label> <value>
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# printf's %-28s pads by bytes, so a label containing "ü" comes out one column
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# short. ${#s} counts characters in a UTF-8 locale, so the padding is computed
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# here instead - and applied inline, because command substitution would eat the
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# trailing spaces again.
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_cau_row() {
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local label="$1" value="$2" pad
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pad=$(( 28 - ${#label} ))
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(( pad < 0 )) && pad=0
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printf ' %s%*s %s\n' "$label" "$pad" '' "$value"
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}
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_cau_onoff() {
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if [[ $1 == yes ]]; then
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printf '%s%s%s' "$CAU_C_GREEN" "$(cau_msg "ON")" "$CAU_C_RESET"
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else
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printf '%s%s%s' "$CAU_C_DIM" "$(cau_msg "OFF")" "$CAU_C_RESET"
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fi
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}
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# cau_timer_next
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# When systemd will fire the timer next, in the user's locale.
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cau_timer_next() {
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local raw
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cau_have systemctl || { cau_msg "unknown"; return; }
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systemctl is-enabled --quiet "$CAU_UNIT" 2>/dev/null || { cau_msg "not scheduled"; return; }
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raw="$(systemctl show "$CAU_UNIT" --property=NextElapseUSecRealtime --value 2>/dev/null)"
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if [[ $raw =~ ^[0-9]+$ ]] && (( raw > 0 )); then
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date -d "@$(( raw / 1000000 ))" '+%c'
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elif [[ -n $raw && $raw != 0 && $raw != n/a ]]; then
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printf '%s' "$raw"
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else
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cau_msg "unknown"
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fi
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}
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# cau_ui_status
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# Shared by the `status` subcommand and the menu header.
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cau_ui_status() {
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local last_run last_success result counts reboot
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local pac aur fp ai total
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last_run="$(cau_state_read last_run '')"
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last_success="$(cau_state_read last_success '')"
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result="$(cau_state_read last_result '')"
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counts="$(cau_state_read last_counts '0 0 0 0')"
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reboot="$(cau_state_read reboot_needed 0)"
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read -r pac aur fp ai <<< "$counts"
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pac=${pac:-0}; aur=${aur:-0}; fp=${fp:-0}; ai=${ai:-0}
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total=$(( pac + aur + fp + ai ))
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_cau_row "$(cau_msg "Automatic updates")" "$(_cau_onoff "$CFG_ENABLED")"
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_cau_row "$(cau_msg "Notifications")" "$(_cau_onoff "$CFG_NOTIFICATIONS")"
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printf '\n'
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_cau_row "$(cau_msg "Last check")" "$(cau_time_ago "$last_run")"
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if [[ -n $last_success ]]; then
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_cau_row "$(cau_msg "Last successful update")" \
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"$(date -d "@$last_success" '+%c' 2>/dev/null || printf '%s' "$last_success") ($(cau_msg "%d packages" "$total"))"
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else
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_cau_row "$(cau_msg "Last successful update")" "$(cau_msg "never")"
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fi
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_cau_row "$(cau_msg "Next scheduled run")" "$(cau_timer_next)"
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if [[ $result == failed ]]; then
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printf '\n %s%s%s\n' "$CAU_C_YELLOW" \
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"$(cau_msg "The last run reported a problem - see 'cachy-auto-update log'.")" \
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"$CAU_C_RESET"
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fi
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if [[ $reboot == 1 ]]; then
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printf '\n %s%s%s\n' "$CAU_C_YELLOW" \
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"$(cau_msg "A restart is recommended to finish a kernel update.")" \
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"$CAU_C_RESET"
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fi
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}
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# cau_ui_status_conditions
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# Evaluates every gate individually. Without this there is no way to explain
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# why an enabled updater has not done anything on somebody else's machine.
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cau_ui_status_conditions() {
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local pct
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printf '\n %s\n' "$(cau_msg "Current conditions:")"
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if cau_on_ac; then
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printf ' %s %s\n' "${CAU_C_GREEN}✔${CAU_C_RESET}" "$(cau_msg "on AC power")"
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else
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pct="$(cau_battery_percent || true)"
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if [[ -n $pct ]]; then
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printf ' %s %s\n' "${CAU_C_DIM}•${CAU_C_RESET}" \
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"$(cau_msg "on battery (%d%%, threshold %d%%)" "$pct" "$CFG_MIN_BATTERY")"
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else
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printf ' %s %s\n' "${CAU_C_DIM}•${CAU_C_RESET}" "$(cau_msg "on battery")"
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fi
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fi
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CAU_SKIP_REASON=''
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if cau_busy; then
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printf ' %s %s\n' "${CAU_C_YELLOW}•${CAU_C_RESET}" "$CAU_SKIP_REASON"
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else
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printf ' %s %s\n' "${CAU_C_GREEN}✔${CAU_C_RESET}" "$(cau_msg "no game detected")"
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fi
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CAU_SKIP_REASON=''
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if cau_package_manager_busy; then
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printf ' %s %s\n' "${CAU_C_YELLOW}•${CAU_C_RESET}" "$CAU_SKIP_REASON"
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else
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printf ' %s %s\n' "${CAU_C_GREEN}✔${CAU_C_RESET}" "$(cau_msg "package system is free")"
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fi
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}
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# cau_ui_menu
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# The default view. Reloads the config after every action so the toggles always
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# reflect what is actually on disk.
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cau_ui_menu() {
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local choice
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while true; do
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cau_config_load
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clear 2>/dev/null || true
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cau_head " $CAU_PRETTY"
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cau_ui_status
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printf '\n'
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printf ' [1] %s\n' "$(cau_msg "Toggle automatic updates")"
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printf ' [2] %s\n' "$(cau_msg "Toggle notifications")"
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printf ' [3] %s\n' "$(cau_msg "Update now")"
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printf ' [4] %s\n' "$(cau_msg "Show log")"
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printf ' [5] %s\n' "$(cau_msg "Show current conditions")"
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printf ' [q] %s\n' "$(cau_msg "Quit")"
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printf '\n > '
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read -r choice || { printf '\n'; return 0; }
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case "$choice" in
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1)
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if [[ $CFG_ENABLED == yes ]]; then cau_do_disable; else cau_do_enable; fi
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cau_pause
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;;
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2)
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if [[ $CFG_NOTIFICATIONS == yes ]]; then
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cau_do_notifications off
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else
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cau_do_notifications on
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fi
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cau_pause
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;;
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3) cau_do_run --force; cau_pause ;;
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4) cau_do_log; cau_pause ;;
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5) cau_ui_status_conditions; cau_pause ;;
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q|Q|'') return 0 ;;
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*) ;;
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esac
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done
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}
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cau_pause() {
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printf '\n %s' "$(cau_msg "Press Enter to continue...")"
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read -r _ || true
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}
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