auto-timezone: add new package

utils/auto-timezone/Makefile

@@ -0,0 +1,41 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=auto-timezone
+PKG_VERSION:=1.0.0
+PKG_RELEASE:=1
+
+PKG_MAINTAINER:=Renn Akaza <openwrt.org-auto-timezone@akaza.ren>
+PKG_LICENSE:=GPL-3.0-or-later
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/auto-timezone
+	SECTION:=utils
+	CATEGORY:=Utilities
+	TITLE:=Auto set timezone by IP
+	PKGARCH:=all
+	DEPENDS:=+zoneinfo-all
+endef
+
+define Package/auto-timezone/description
+Hotplug script to automatically configure the timezone UCI settings based on the IP address.
+
+The user needs to set their own endpoint to get the IANA timezone string, e.g.:
+	uci set auto-timezone.config.endpoint="https://domain.tld/timezone"
+	uci commit auto-timezone
+
+The endpoint is expected to respond GET requests by a plaintext one-line IANA timezone string, e.g. "Europe/London".
+The endpoint can be verified by directly accessing the its URL from a browser by the address bar.
+endef
+
+define Build/Compile
+endef
+
+define Package/auto-timezone/install
+	$(INSTALL_DIR) $(1)/etc/hotplug.d/iface/
+	$(INSTALL_DATA) ./files/99-auto-timezone $(1)/etc/hotplug.d/iface/
+	$(INSTALL_DIR) $(1)/etc/config
+	$(INSTALL_CONF) ./files/auto-timezone.config $(1)/etc/config/auto-timezone
+endef
+
+$(eval $(call BuildPackage,auto-timezone))

utils/auto-timezone/files/99-auto-timezone

@@ -0,0 +1,58 @@
+#!/bin/sh
+
+if [ "${INTERFACE}" = "loopback" ]; then
+    exit 0
+fi
+if [ "${ACTION}" != "ifup" ] && [ "${ACTION}" != "ifupdate" ]; then
+    exit 0
+fi
+if [ "${ACTION}" = "ifupdate" ] && [ -z "${IFUPDATE_ADDRESSES}" ] && [ -z "${IFUPDATE_DATA}" ]; then
+    exit 0
+fi
+
+log() {
+    logger -t "auto-timezone" "$@"
+}
+
+log_info() {
+    log -p user.info "$*"
+}
+
+log_error() {
+    log -p user.err "$*"
+}
+
+get_posix_timezone() {
+    iana_timezone=$1
+    tail -n1 /usr/share/zoneinfo/${iana_timezone}
+}
+
+endpoint="$(uci -q get auto-timezone.config.endpoint)"
+if [ $? -ne 0 ]; then
+    log_error "Endpoint not set"
+    exit 1
+fi
+
+for i in {1..5}; do
+    timezone_iana="$(wget --timeout=5 -qO- "${endpoint}")" && break || sleep 1
+done
+
+if [ -z "${timezone_iana}" ]; then
+    log_error "Failed to get timezone"
+    exit 1
+fi
+
+timezone_posix="$(get_posix_timezone ${timezone_iana})"
+if [ $? -ne 0 ]; then
+    log_error "Invalid timezone"
+    exit 1
+fi
+
+if [ "${timezone_iana}" != "$(uci get system.@system[0].zonename)" ] || [  "${timezone_posix}" != "$(uci get system.@system[0].timezone)" ]; then
+    log_info "Updating timezone, IANA: ${timezone_iana}, POSIX: ${timezone_posix}"
+    uci set system.@system[0].zonename="${timezone_iana}"
+    uci set system.@system[0].timezone="${timezone_posix}"
+    uci commit system
+    /etc/init.d/system reload
+    /etc/init.d/cron restart
+fi

utils/auto-timezone/files/auto-timezone.config

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+config auto-timezone 'config'