Add udev rules to ensure device presence

Author: qzed

etc/systemd/surface-dtx-daemon.service

@@ -1,7 +1,8 @@
 [Unit]
 Description=Surface Detachment System (DTX) Daemon
 Documentation=https://github.com/qzed/linux-surface-dtx-daemon
-After=basic.target
+After=dev-surface_dtx.device
+Wants=dev-surface_dtx.device
 
 [Service]
 Type=simple

etc/udev/40-surface_dtx.rules

@@ -0,0 +1 @@
+KERNEL=="surface_dtx", TAG+="systemd"

pkg/arch/PKGBUILD

@@ -51,6 +51,9 @@ package() {
     # dbus config file
     install -D -m644 "src/etc/dbus/org.surface.dtx.conf" "$pkgdir/etc/dbus-1/system.d/org.surface.dtx.conf"
 
+    # udev rules
+    install -D -m644 "src/etc/udev/40-surface_dtx.rules" "$pkgdir/etc/udev/rules.d/40-surface_dtx.rules"
+
     # completion files
     install -D -m644 "src/target/surface-dtx-daemon.bash" "$pkgdir/usr/share/bash-completion/completions/surface-dtx-daemon"
     install -D -m644 "src/target/surface-dtx-userd.bash" "$pkgdir/usr/share/bash-completion/completions/surface-dtx-userd"

pkg/deb/debian/rules

@@ -29,6 +29,9 @@ override_dh_install:
 	# dbus config file
 	install -D -m644 "etc/dbus/org.surface.dtx.conf" "${pkgdir}/etc/dbus-1/system.d/org.surface.dtx.conf"
 
+	# udev rules
+	install -D -m644 "etc/udev/40-surface_dtx.rules" "${pkgdir}/etc/udev/rules.d/40-surface_dtx.rules"
+
 	# completion files
 	install -D -m644 "target/surface-dtx-daemon.bash" "${pkgdir}/usr/share/bash-completion/completions/surface-dtx-daemon"
 	install -D -m644 "target/surface-dtx-userd.bash" "${pkgdir}/usr/share/bash-completion/completions/surface-dtx-userd"