9 files changed, 155 insertions, 0 deletions
diff --git a/package/ifupdown-scripts/Config.in b/package/ifupdown-scripts/Config.in
new file mode 100644
index 0000000000..7086253a03
--- /dev/null
+++ b/package/ifupdown-scripts/Config.in
@@ -0,0 +1,8 @@
+config BR2_PACKAGE_IFUPDOWN_SCRIPTS
+	bool
+	depends on BR2_ROOTFS_SKELETON_DEFAULT
+	depends on !BR2_PACKAGE_SYSTEMD_NETWORKD
+	default y
+	help
+	  Set of scripts used by ifupdown (either the standalone one, or the
+	  busybox one) to bring network up, or tear it down.
diff --git a/package/ifupdown-scripts/S40network b/package/ifupdown-scripts/S40network
new file mode 100755
index 0000000000..642c5013ac
--- /dev/null
+++ b/package/ifupdown-scripts/S40network
@@ -0,0 +1,30 @@
+#!/bin/sh
+#
+# Start the network....
+#
+
+# Debian ifupdown needs the /run/network lock directory
+mkdir -p /run/network
+
+case "$1" in
+  start)
+	printf "Starting network: "
+	/sbin/ifup -a
+	[ $? = 0 ] && echo "OK" || echo "FAIL"
+	;;
+  stop)
+	printf "Stopping network: "
+	/sbin/ifdown -a
+	[ $? = 0 ] && echo "OK" || echo "FAIL"
+	;;
+  restart|reload)
+	"$0" stop
+	"$0" start
+	;;
+  *)
+	echo "Usage: $0 {start|stop|restart}"
+	exit 1
+esac
+
+exit $?
+
diff --git a/package/ifupdown-scripts/ifupdown-scripts.mk b/package/ifupdown-scripts/ifupdown-scripts.mk
new file mode 100644
index 0000000000..317c8f49bf
--- /dev/null
+++ b/package/ifupdown-scripts/ifupdown-scripts.mk
@@ -0,0 +1,55 @@
+################################################################################
+#
+# ifupdown-scripts
+#
+################################################################################
+
+define IFUPDOWN_SCRIPTS_LOCALHOST
+	( \
+		echo "# interface file auto-generated by buildroot"; \
+		echo ; \
+		echo "auto lo"; \
+		echo "iface lo inet loopback"; \
+	) > $(TARGET_DIR)/etc/network/interfaces
+endef
+
+IFUPDOWN_SCRIPTS_DHCP_IFACE = $(call qstrip,$(BR2_SYSTEM_DHCP))
+
+ifneq ($(IFUPDOWN_SCRIPTS_DHCP_IFACE),)
+define IFUPDOWN_SCRIPTS_DHCP
+	( \
+		echo ; \
+		echo "auto $(IFUPDOWN_SCRIPTS_DHCP_IFACE)"; \
+		echo "iface $(IFUPDOWN_SCRIPTS_DHCP_IFACE) inet dhcp"; \
+		echo "  pre-up /etc/network/nfs_check"; \
+		echo "  wait-delay 15"; \
+	) >> $(TARGET_DIR)/etc/network/interfaces
+	$(INSTALL) -m 0755 -D $(IFUPDOWN_SCRIPTS_PKGDIR)/nfs_check \
+		$(TARGET_DIR)/etc/network/nfs_check
+endef
+endif
+
+define IFUPDOWN_SCRIPTS_INSTALL_TARGET_CMDS
+	mkdir -p $(TARGET_DIR)/etc/network
+	cp -a $(IFUPDOWN_SCRIPTS_PKGDIR)/network/* $(TARGET_DIR)/etc/network
+	$(IFUPDOWN_SCRIPTS_LOCALHOST)
+	$(IFUPDOWN_SCRIPTS_DHCP)
+endef
+
+define IFUPDOWN_SCRIPTS_INSTALL_INIT_SYSV
+	$(INSTALL) -D -m 0755 $(IFUPDOWN_SCRIPTS_PKGDIR)/S40network \
+		$(TARGET_DIR)/etc/init.d/S40network
+endef
+
+# ifupdown-scripts can not be selected when systemd-networkd is
+# enabled, so if we are enabled with systemd, we must install our
+# own service file.
+define IFUPDOWN_SCRIPTS_INSTALL_INIT_SYSTEMD
+	$(INSTALL) -D -m 644 $(IFUPDOWN_SCRIPTS_PKGDIR)/network.service \
+		$(TARGET_DIR)/etc/systemd/system/network.service
+	mkdir -p $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants
+	ln -fs ../network.service \
+		$(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/network.service
+endef
+
+$(eval $(generic-package))
diff --git a/package/ifupdown-scripts/network.service b/package/ifupdown-scripts/network.service
new file mode 100644
index 0000000000..0d77bb824a
--- /dev/null
+++ b/package/ifupdown-scripts/network.service
@@ -0,0 +1,21 @@
+[Unit]
+Description=Network Connectivity
+Wants=network.target
+Before=network.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+
+# lo is brought up earlier, which will cause the upcoming "ifup -a" to fail
+# with exit code 1, due to an "ip: RTNETLINK answers: File exists" error during
+# its "ip addr add ..." command, subsequently causing this unit to fail even
+# though it is a benign error. Flushing the lo address with the command below
+# before ifup prevents this failure.
+ExecStart=/sbin/ip addr flush dev lo
+
+ExecStart=/sbin/ifup -a
+ExecStop=/sbin/ifdown -a
+
+[Install]
+WantedBy=multi-user.target
diff --git a/package/ifupdown-scripts/network/if-down.d/.empty b/package/ifupdown-scripts/network/if-down.d/.empty
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/package/ifupdown-scripts/network/if-down.d/.empty
diff --git a/package/ifupdown-scripts/network/if-post-down.d/.empty b/package/ifupdown-scripts/network/if-post-down.d/.empty
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/package/ifupdown-scripts/network/if-post-down.d/.empty
diff --git a/package/ifupdown-scripts/network/if-pre-up.d/wait_iface b/package/ifupdown-scripts/network/if-pre-up.d/wait_iface
new file mode 100755
index 0000000000..ebccff2aa5
--- /dev/null
+++ b/package/ifupdown-scripts/network/if-pre-up.d/wait_iface
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# In case we have a slow-to-appear interface (e.g. eth-over-USB),
+# and we need to configure it, wait until it appears, but not too
+# long either. IF_WAIT_DELAY is in seconds.
+
+if [ "${IF_WAIT_DELAY}" -a ! -e "/sys/class/net/${IFACE}" ]; then
+    printf "Waiting for interface %s to appear" "${IFACE}"
+    while [ ${IF_WAIT_DELAY} -gt 0 ]; do
+        if [ -e "/sys/class/net/${IFACE}" ]; then
+            printf "\n"
+            exit 0
+        fi
+        sleep 1
+        printf "."
+        : $((IF_WAIT_DELAY -= 1))
+    done
+    printf " timeout!\n"
+    exit 1
+fi
+
diff --git a/package/ifupdown-scripts/network/if-up.d/.empty b/package/ifupdown-scripts/network/if-up.d/.empty
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/package/ifupdown-scripts/network/if-up.d/.empty
diff --git a/package/ifupdown-scripts/nfs_check b/package/ifupdown-scripts/nfs_check
new file mode 100755
index 0000000000..dfa0cbf580
--- /dev/null
+++ b/package/ifupdown-scripts/nfs_check
@@ -0,0 +1,20 @@
+#!/bin/sh
+
+# This allows NFS booting to work while also being able to configure
+# the network interface via DHCP when not NFS booting.  Otherwise, a
+# NFS booted system will likely hang during DHCP configuration.
+
+# Attempting to configure the network interface used for NFS will
+# initially bring that network down.  Since the root filesystem is
+# accessed over this network, the system hangs.
+
+# This script is run by ifup and will attempt to detect if a NFS root
+# mount uses the interface to be configured (IFACE), and if so does
+# not configure it.  This should allow the same build to be disk/flash
+# booted or NFS booted.
+
+nfsip=`sed -n '/^[^ ]*:.* \/ nfs.*[ ,]addr=\([0-9.]\+\).*/s//\1/p' /proc/mounts`
+if [ -n "$nfsip" ] && ip route get to "$nfsip" | grep -q "dev $IFACE"; then
+	echo Skipping $IFACE, used for NFS from $nfsip
+	exit 1
+fi