update

user/package-status-refresh.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+
+set -uo pipefail
+
+readonly cache_dir="${XDG_CACHE_HOME:-${HOME}/.cache}/package-status"
+readonly cache_file="${cache_dir}/status"
+readonly attempt_file="${cache_dir}/last-attempt"
+readonly pacman_log="/var/log/pacman.log"
+readonly pacman_lock="/var/lib/pacman/db.lck"
+
+mkdir -p "${cache_dir}"
+chmod 700 "${cache_dir}"
+touch "${attempt_file}" || exit 1
+
+# Never inspect the package database while pacman is changing it. A later
+# timer run or terminal startup will request another refresh.
+if [[ -e "${pacman_lock}" ]]; then
+	exit 75
+fi
+
+pacman_log_signature_before=$(stat -c '%Y:%s:%i' "${pacman_log}" 2>/dev/null || printf '0:0:0')
+
+updates_output=''
+updates_output=$(CHECKUPDATES_DB="${cache_dir}/checkupdates-db" checkupdates --nocolor 2>/dev/null)
+checkupdates_status=$?
+
+case "${checkupdates_status}" in
+	0)
+		updates_count=$(printf '%s\n' "${updates_output}" | awk 'NF { count++ } END { print count + 0 }')
+		;;
+	2)
+		updates_count=0
+		;;
+	*)
+		# A network or mirror failure must not replace a known-good cache.
+		exit "${checkupdates_status}"
+		;;
+esac
+
+orphans_count=$(pacman -Qdtq 2>/dev/null | awk 'NF { count++ } END { print count + 0 }')
+pacman_log_signature_after=$(stat -c '%Y:%s:%i' "${pacman_log}" 2>/dev/null || printf '0:0:0')
+
+# Discard the result if a package operation overlapped this refresh.
+if [[ -e "${pacman_lock}" || "${pacman_log_signature_before}" != "${pacman_log_signature_after}" ]]; then
+	exit 75
+fi
+
+umask 077
+temporary_file=$(mktemp "${cache_dir}/status.XXXXXX")
+trap 'rm -f "${temporary_file}"' EXIT
+
+printf 'version=1\nupdates=%d\norphans=%d\nchecked_at=%d\npacman_log_signature=%s\n' \
+	"${updates_count}" \
+	"${orphans_count}" \
+	"$(date +%s)" \
+	"${pacman_log_signature_after}" > "${temporary_file}"
+
+mv -f "${temporary_file}" "${cache_file}"
+trap - EXIT