From d7fae1403012fbebd4f0399a8748312fa4d67143 Mon Sep 17 00:00:00 2001
From: Florian Eckert <fe@dev.tdt.de>
Date: Thu, 30 Jan 2025 11:55:19 +0100
Subject: [PATCH] gpsd: add hotplug handling

The 'gpsd' offers the possibility to call the script '/etc/gpsd/device-hook'
when a GPS source was added or removed via gpsdctl.

In addition to the '/etc/gpsd/device-hook' call an event is now triggered
too after the 'gpsd' has started. This allows scripts to configurre 'gpsd'
receivers.

The following events are available for '/etc/hotplug.d/gpsd' scripts:

* ACTIVATE   via '/etc/gpsd/device-hook'
* DEACTIVATE via '/etc/gpsd/device-hook'
* STARTED    via '/etc/init.d/gpsd'

Signed-off-by: Florian Eckert <fe@dev.tdt.de>
---
 utils/gpsd/Makefile                          |  5 ++++-
 utils/gpsd/files/etc/gpsd/device-hook        | 19 +++++++++++++++++++
 utils/gpsd/files/etc/hotplug.d/gpsd/00-debug | 14 ++++++++++++++
 utils/gpsd/files/gpsd.init                   |  9 +++++++++
 4 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 utils/gpsd/files/etc/gpsd/device-hook
 create mode 100644 utils/gpsd/files/etc/hotplug.d/gpsd/00-debug

diff --git a/utils/gpsd/Makefile b/utils/gpsd/Makefile
index 5b52dcfb38..ac568fbc2b 100644
--- a/utils/gpsd/Makefile
+++ b/utils/gpsd/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=gpsd
 PKG_VERSION:=3.25
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@SAVANNAH/$(PKG_NAME)
@@ -141,6 +141,9 @@ define Package/gpsd/install
 	$(INSTALL_BIN) ./files/gpsd.init $(1)/etc/init.d/gpsd
 	$(INSTALL_DIR) $(1)/usr/sbin
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/gpsd $(1)/usr/sbin/
+
+	$(INSTALL_DIR) $(1)/etc/gpsd
+	$(INSTALL_BIN) ./files/etc/gpsd/device-hook $(1)/etc/gpsd/
 endef
 
 define Package/gpsd-clients/install
diff --git a/utils/gpsd/files/etc/gpsd/device-hook b/utils/gpsd/files/etc/gpsd/device-hook
new file mode 100644
index 0000000000..42f986c8fb
--- /dev/null
+++ b/utils/gpsd/files/etc/gpsd/device-hook
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+main() {
+	local device="$1"
+	local action="$2"
+
+	case "$action" in
+		"ACTIVATE")
+			env -i ACTION="$action" DEVICE="$device" \
+				/sbin/hotplug-call gpsd
+			;;
+		"DEACTIVATE")
+			env -i ACTION="$action" DEVICE="$device" \
+				/sbin/hotplug-call gpsd
+			;;
+	esac
+}
+
+main "$@"
diff --git a/utils/gpsd/files/etc/hotplug.d/gpsd/00-debug b/utils/gpsd/files/etc/hotplug.d/gpsd/00-debug
new file mode 100644
index 0000000000..ca55fcdedb
--- /dev/null
+++ b/utils/gpsd/files/etc/hotplug.d/gpsd/00-debug
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+gps_log() {
+	local level="$1"; shift
+
+	[ "$level" = "debug" ] && return
+	logger -p "daemon.${level}" -t "gpsd(debug)[$$]" "hotplug: $*"
+}
+
+main() {
+	gps_log info "$(env)"
+}
+
+main "$@"
diff --git a/utils/gpsd/files/gpsd.init b/utils/gpsd/files/gpsd.init
index ba5563e858..ee1fabf69b 100644
--- a/utils/gpsd/files/gpsd.init
+++ b/utils/gpsd/files/gpsd.init
@@ -49,3 +49,12 @@ service_triggers() {
 	procd_add_reload_trigger "$NAME"
 	procd_add_validation validate_section_gpsd
 }
+
+service_started() {
+	local enabled
+
+	enabled="$(uci_get gpsd core enabled 0)"
+	[ "$enabled" = "0" ] && return
+
+	env -i ACTION="STARTED" /sbin/hotplug-call gpsd
+}
-- 
2.30.2