package/earlyoom: new package

EarlyOOM daemon for triggering Linux OOM killer before running out of
memory, avoiding situations where the machine becomes unresponsive from
out of control swapping.

Some desktop distributions are installing and enabling this daemon by
default to prevent unresponsive machines in OOM scenarios.

https://fedoraproject.org/wiki/Changes/EnableEarlyoom
Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
[yann.morin.1998@free.fr: two spaces in hash file]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

DEVELOPERS

@@ -1356,6 +1356,7 @@ N:	Joseph Kogut <joseph.kogut@gmail.com>
 F:	package/at-spi2-atk/
 F:	package/at-spi2-core/
 F:	package/clang/
+F:	package/earlyoom/
 F:	package/gconf/
 F:	package/libnss/
 F:	package/lld/

package/Config.in

@@ -2337,6 +2337,7 @@ menu "System tools"
 	source "package/docker-containerd/Config.in"
 	source "package/docker-engine/Config.in"
 	source "package/docker-proxy/Config.in"
+	source "package/earlyoom/Config.in"
 	source "package/efibootmgr/Config.in"
 	source "package/efivar/Config.in"
 	source "package/emlog/Config.in"

package/earlyoom/Config.in

@@ -0,0 +1,12 @@
+config BR2_PACKAGE_EARLYOOM
+	bool "earlyoom"
+	depends on BR2_USE_MMU
+	help
+	  Early OOM daemon for Linux.
+
+	  User space daemon for triggering Linux OOM killer
+	  before running out of memory, avoiding situations
+	  where the machine becomes unresponsive from out of
+	  control swapping.
+
+	  https://github.com/rfjakob/earlyoom

package/earlyoom/S02earlyoom

@@ -0,0 +1,49 @@
+#!/bin/sh
+
+DAEMON="earlyoom"
+PIDFILE="/var/run/$DAEMON.pid"
+
+EARLYOOM_ARGS=""
+
+[ -r "/etc/default/$DAEMON" ] && . "/etc/default/$DAEMON"
+
+start() {
+	printf() 'Starting %s: ' "$DAEMON"
+	start-stop-daemon -b -m -S -q -p "$PIDFILE" -x "/bin/$DAEMON" \
+	       -- $EARLYOOM_ARGS
+	status=$?
+	if [ "$status" -eq 0 ]; then
+		echo "OK"
+	else
+		echo "FAIL"
+	fi
+	return "$status"
+}
+
+stop() {
+	printf 'Stopping %s: ' "$DAEMON"
+	start-stop-daemon -K -q -p "$PIDFILE"
+	status=$?
+	if [ "$status" -eq 0 ]; then
+		rm -f "$PIDFILE"
+		echo "OK"
+	else
+		echo "FAIL"
+	fi
+	return "$status"
+}
+
+restart() {
+	stop
+	start
+}
+
+case "$1" in
+	start|stop|restart)
+		"$1";;
+	reload)
+		restart;;
+	*)
+		echo "Usage: $0 {start|stop|restart|reload}"
+		exit 1
+esac

package/earlyoom/earlyoom.hash

@@ -0,0 +1,4 @@
+# locally calculated
+sha256  b81804fc4470f996014d52252a87a1cf3b43d3d8754140035b10dcee349302b8  earlyoom-1.6.tar.gz
+# License files, locally calculated
+sha256  e730b3ec729de46d987ae73f30ed337e4cbe832f09205330acfa71848c6e0087  LICENSE

package/earlyoom/earlyoom.mk

@@ -0,0 +1,40 @@
+################################################################################
+#
+# earlyoom
+#
+################################################################################
+
+EARLYOOM_VERSION = 1.6
+EARLYOOM_SITE = $(call github,rfjakob,earlyoom,v$(EARLYOOM_VERSION))
+EARLYOOM_LICENSE = MIT
+EARLYOOM_LICENSE_FILES = LICENSE
+
+EARLYOOM_BUILD_TARGETS = earlyoom.service earlyoom
+EARLYOOM_INSTALL_TARGETS = install-default install-bin
+EARLYOOM_CFLAGS = '$(TARGET_CFLAGS) -std=gnu99 -DVERSION=\"1.6\"'
+
+EARLYOOM_MAKE_OPTS = \
+	$(TARGET_CONFIGURE_OPTS) \
+	PREFIX=/usr
+
+define EARLYOOM_BUILD_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) $(EARLYOOM_MAKE_OPTS) -C $(@D) \
+		$(EARLYOOM_BUILD_TARGETS) CFLAGS=$(EARLYOOM_CFLAGS)
+endef
+
+define EARLYOOM_INSTALL_TARGET_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) $(EARLYOOM_MAKE_OPTS) -C $(@D) \
+		$(EARLYOOM_INSTALL_TARGETS) DESTDIR=$(TARGET_DIR)
+endef
+
+define EARLYOOM_INSTALL_INIT_SYSV
+	$(INSTALL) -D -m 755 $(EARLYOOM_PKGDIR)/S02earlyoom \
+		$(TARGET_DIR)/etc/init.d/S02earlyoom
+endef
+
+define EARLYOOM_INSTALL_INIT_SYSTEMD
+	$(INSTALL) -D -m 644 $(@D)/earlyoom.service \
+		$(TARGET_DIR)/usr/lib/systemd/system/earlyoom.service
+endef
+
+$(eval $(generic-package))