package/openrc: add support for spawning getty

We install a template getty service, and we 'instantiate' it in the
default runlevel, using the configured tty.

Ideally, packages that provide a getty program would be responsible
for installing the corresponding service file. However, to keep
consistency with the existing init systems (busybox, systemd, and
sysv), so we do provide it from the openrc package itself.

OpenRC only acts on the files in a runlevel sub-directory, but the
documentation [0] actually suggests that the instance symlink be done
in init.d, and then again symlinked into the actual runlevel
sub-directory. So, we abide by the rules.

Also, to be noted, the getty service file is installed without ensuring
that a getty command is available. This again is not unlike other init
systems, sysvinit and busybox, which behave the same.

[0] https://wiki.gentoo.org/wiki/OpenRC

Signed-off-by: Michał Łyszczek <michal.lyszczek@bofc.pl>
[yann.morin.1998@free.fr:
  - move getty template to openrc package  (Thomas)
  - fix namespace of the vaiables (Thomas)
  - simplify creation of the defaults file
  - rewrite commit log
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/openrc/getty

@@ -0,0 +1,24 @@
+#!/sbin/openrc-run
+# based on agetty service from OpenRC package
+
+description="start getty on terminal"
+supervisor=supervise-daemon
+port="${RC_SVCNAME#*.}"
+term_type="${term_type:-linux}"
+command=/sbin/getty
+command_args_foreground="${getty_options} ${baud} ${port} ${term_type}"
+pidfile="/run/${RC_SVCNAME}.pid"
+
+depend() {
+	# start getty at the very end of init
+	after *
+	keyword -prefix
+}
+
+start_pre() {
+	export EINFO_QUIET="${quiet:-yes}"
+}
+
+stop_pre() {
+	export EINFO_QUIET="${quiet:-yes}"
+}

package/openrc/openrc.mk

@@ -42,4 +42,22 @@ define OPENRC_REMOVE_UNNEEDED
 endef
 OPENRC_TARGET_FINALIZE_HOOKS += OPENRC_REMOVE_UNNEEDED
 
+ifeq ($(BR2_TARGET_GENERIC_GETTY),y)
+OPENRC_GETTY_SVCNAME = getty.$(SYSTEM_GETTY_PORT)
+OPENRC_GETTY_CONF_D = $(TARGET_DIR)/etc/conf.d/$(OPENRC_GETTY_SVCNAME)
+define OPENRC_SET_GETTY
+	{ \
+		echo "baud=\"$(SYSTEM_GETTY_BAUDRATE)\""; \
+		echo "term_type=\"$(SYSTEM_GETTY_TERM)\"" ; \
+		echo "getty_options=\"-L $(SYSTEM_GETTY_OPTIONS)\""; \
+	} > $(OPENRC_GETTY_CONF_D)
+	$(INSTALL) -D -m 0755 $(OPENRC_PKGDIR)/getty \
+		$(TARGET_DIR)/etc/init.d/getty
+	ln -sf getty $(TARGET_DIR)/etc/init.d/$(OPENRC_GETTY_SVCNAME)
+	ln -sf /etc/init.d/$(OPENRC_GETTY_SVCNAME) \
+		$(TARGET_DIR)/etc/runlevels/default/$(OPENRC_GETTY_SVCNAME)
+endef
+OPENRC_TARGET_FINALIZE_HOOKS += OPENRC_SET_GETTY
+endif # BR2_TARGET_GENERIC_GETTY
+
 $(eval $(generic-package))

system/Config.in

@@ -348,16 +348,16 @@ config BR2_TARGET_GENERIC_GETTY_BAUDRATE
 config BR2_TARGET_GENERIC_GETTY_TERM
 	string "TERM environment variable"
 	default "vt100"
-	# currently observed only by busybox and sysvinit
-	depends on BR2_INIT_BUSYBOX || BR2_INIT_SYSV
+	# currently observed by all but systemd
+	depends on !BR2_INIT_SYSTEMD
 	help
 	  Specify a TERM type.
 
 config BR2_TARGET_GENERIC_GETTY_OPTIONS
 	string "other options to pass to getty"
 	default ""
-	# currently observed only by busybox and sysvinit
-	depends on BR2_INIT_BUSYBOX || BR2_INIT_SYSV
+	# currently observed by all but systemd
+	depends on !BR2_INIT_SYSTEMD
 	help
 	  Any other flags you want to pass to getty,
 	  Refer to getty --help for details.