[ptxdist] [PATCH] hostapd: Add systemd service unit

[Gavin Schenk <g.schenk@eckelmann.de>]

If selected, start hostapd as a systemd service in multi-user.target.
Make it possible to rename the configuration file, if needed.

Signed-off-by: Gavin Schenk <g.schenk@eckelmann.de>
---
   Notes:
      I based the service file on the one that is shipped with debian, but
      removed the Documentation node. I removed (for me) unneeded
      EnvironmentFile=-/etc/default/hostapd and $DAEMON_OPTS as well, RFC.

      My system is shipped with template /etc/hostapd/hostapd.conf that contains
      @SSID@ as placeholder. The customer API, configuring WLAN, is to edit this
      file and place it as /etc/hostapd-device.conf before restarting the
      machine. This is the reason for HOSTAPD_SYSTEMD_UNIT_CONFIG.


.../usr/lib/systemd/system/hostapd.service    | 15 ++++++++++++++
 rules/hostapd.in                              | 20 +++++++++++++++++++
 rules/hostapd.make                            | 11 ++++++++++
 3 files changed, 46 insertions(+)
 create mode 100644 projectroot/usr/lib/systemd/system/hostapd.service

diff --git a/projectroot/usr/lib/systemd/system/hostapd.service b/projectroot/usr/lib/systemd/system/hostapd.service
new file mode 100644
index 000000000..5e715b60d
--- /dev/null
+++ b/projectroot/usr/lib/systemd/system/hostapd.service
@@ -0,0 +1,15 @@
+[Unit]
+Description=Access point and authentication server for Wi-Fi and Ethernet
+After=network.target
+ConditionFileNotEmpty=@HOSTAPD_CONFIG_FILEPATH@
+
+[Service]
+Type=forking
+PIDFile=/run/hostapd.pid
+Restart=on-failure
+RestartSec=2
+Environment=DAEMON_CONF=@HOSTAPD_CONFIG_FILEPATH@
+ExecStart=/usr/sbin/hostapd -B -P /run/hostapd.pid ${DAEMON_CONF}
+
+[Install]
+WantedBy=multi-user.target
diff --git a/rules/hostapd.in b/rules/hostapd.in
index 6ac6be52c..74a0dd45f 100644
--- a/rules/hostapd.in
+++ b/rules/hostapd.in
@@ -21,3 +21,23 @@ config HOSTAPD
 	  authentication without requiring an external RADIUS
 	  authentication server), and RADIUS authentication server for
 	  EAP authentication.
+
+if HOSTAPD
+
+config HOSTAPD_SYSTEMD
+	prompt "Enable systemd support"
+	default false
+	bool
+
+config HOSTAPD_SYSTEMD_UNIT
+	default HOSTAPD_SYSTEMD
+	bool
+
+config HOSTAPD_SYSTEMD_UNIT_CONFIG
+	prompt "Configuration file used by unit"
+	default "/etc/hostapd/hostapd.conf"
+	string
+	help
+	  Configuration used, when starting hostapd"
+
+endif
diff --git a/rules/hostapd.make b/rules/hostapd.make
index 2d061b5d4..7d3d4ec62 100644
--- a/rules/hostapd.make
+++ b/rules/hostapd.make
@@ -74,6 +74,17 @@ $(STATEDIR)/hostapd.targetinstall:
 	@$(call install_copy, hostapd, 0, 0, 0755, -, /usr/sbin/hostapd)
 	@$(call install_alternative, hostapd, 0, 0, 0644, /etc/hostapd/hostapd.conf)
 
+ifdef PTXCONF_HOSTAPD_SYSTEMD_UNIT
+	@$(call install_alternative, hostapd, 0, 0, 0644, \
+		/usr/lib/systemd/system/hostapd.service)
+	@$(call install_replace, hostapd, /usr/lib/systemd/system/hostapd.service, \
+		@HOSTAPD_CONFIG_FILEPATH@, \
+		"$(call remove_quotes,$(PTXCONF_HOSTAPD_SYSTEMD_UNIT_CONFIG))")
+
+	@$(call install_link, hostapd, ../hostapd.service, \
+		/lib/systemd/system/multi-user.target.wants/hostapd.service)
+endif
+
 	@$(call install_finish, hostapd)
 
 	@$(call touch)
-- 
2.39.2