From ca9c1938ca136ebd5f341f9fb01b822905f41906 Mon Sep 17 00:00:00 2001
From: Carlo Landmeter <clandmeter@gmail.com>
Date: Fri, 28 Oct 2016 15:31:31 +0200
Subject: mkinitfs: add nbd support

this also introduces default behaviour for networking
calling configure_ip without setting ip defaults to dhcp
---
 Makefile                   |  4 +++-
 features.d/nbd.files       |  1 +
 features.d/nbd.modules     |  1 +
 features.d/network.modules |  2 ++
 initramfs-init.in          | 38 +++++++++++++++++++++++++++++---------
 5 files changed, 36 insertions(+), 10 deletions(-)
 create mode 100644 features.d/nbd.files
 create mode 100644 features.d/nbd.modules

diff --git a/Makefile b/Makefile
index b599b01..124cf0a 100644
--- a/Makefile
+++ b/Makefile
@@ -40,7 +40,9 @@ CONF_FILES	:= mkinitfs.conf \
 		features.d/ubifs.modules \
 		features.d/usb.modules \
 		features.d/virtio.modules \
-		features.d/xfs.modules
+		features.d/xfs.modules \
+		features.d/nbd.files \
+		features.d/nbd.modules
 
 SCRIPTS		:= mkinitfs bootchartd initramfs-init
 IN_FILES	:= $(addsuffix .in,$(SCRIPTS))
diff --git a/features.d/nbd.files b/features.d/nbd.files
new file mode 100644
index 0000000..3796750
--- /dev/null
+++ b/features.d/nbd.files
@@ -0,0 +1 @@
+/usr/sbin/nbd-client
diff --git a/features.d/nbd.modules b/features.d/nbd.modules
new file mode 100644
index 0000000..0b0ca75
--- /dev/null
+++ b/features.d/nbd.modules
@@ -0,0 +1 @@
+kernel/drivers/block/nbd.ko
diff --git a/features.d/network.modules b/features.d/network.modules
index 8397498..311df0b 100644
--- a/features.d/network.modules
+++ b/features.d/network.modules
@@ -1,2 +1,4 @@
 kernel/drivers/net/ethernet
 kernel/net/packet/af_packet.ko
+kernel/drivers/net/hyperv
+kernel/drivers/net/vmxnet3
diff --git a/initramfs-init.in b/initramfs-init.in
index 1a1adab..78bcbe4 100755
--- a/initramfs-init.in
+++ b/initramfs-init.in
@@ -167,14 +167,15 @@ ip_set() {
 #   ip=client-ip:server-ip:gw-ip:netmask:hostname:device:autoconf
 #   ip=dhcp
 #   "server-ip" and "hostname" are not supported here.
+# Default (when configure_ip is called without setting ip=):
+#   ip=dhcp
 #
 configure_ip() {
-	[ -z "$KOPT_ip" -o "$MAC_ADDRESS" ] && return
-	OIFS=$IFS
-	IFS=':'
-	eval set -- $KOPT_ip
-	IFS=$OIFS
-
+	[ -n "$MAC_ADDRESS" ] && return
+	local ops=${KOPT_ip:-dhcp}
+	local IFS=':'
+	set -- $ops
+	unset IFS
 	local client_ip="$1"
 	local gw_ip="$3"
 	local netmask="$4"
@@ -190,13 +191,12 @@ configure_ip() {
 		echo "ERROR: IP requested but no network device was found"
 		return 1
 	fi
-
 	if [ "$autoconf" = "dhcp" ]; then
+		# automatic configuration
 		if [ ! -e /usr/share/udhcpc/default.script ]; then
 			echo "ERROR: DHCP requested but not present in initrd"
 			return 1
 		fi
-		# automatic configuration
 		ebegin "Obtaining IP via DHCP ($device)..."
 		ifconfig $device 0.0.0.0
 		udhcpc -i $device -f -q
@@ -241,6 +241,21 @@ find_boot_repositories() {
 	fi
 }
 
+setup_nbd() {
+	modprobe -q nbd max_part=8 || return 1
+	local IFS=, n=0
+	set -- $KOPT_nbd
+	unset IFS
+	for ops; do
+		local server="${ops%:*}"
+		local port="${ops#*:}"
+		local device="/dev/nbd${n}"
+		[ -b "$device" ] || continue
+		nbd-client "$server" "$port" "$device" && n=$((n+1))
+	done
+	[ "$n" != 0 ] || return 1
+}
+
 # read the kernel options. we need surve things like:
 #  acpi_osi="!Windows 2006" xen-pciback.hide=(01:00.0)
 set -- $(cat /proc/cmdline)
@@ -248,7 +263,7 @@ set -- $(cat /proc/cmdline)
 myopts="alpine_dev autodetect autoraid chart cryptroot cryptdm debug_init
 	dma init_args keep_apk_new modules ovl_dev pkgs quiet root_size root
 	usbdelay ip alpine_repo apkovl alpine_start splash blacklist
-	overlaytmpfs rootfstype rootflags"
+	overlaytmpfs rootfstype rootflags nbd"
 
 for opt; do
 	case "$opt" in
@@ -343,6 +358,11 @@ if [ -n "$KOPT_cryptroot" ]; then
 	fi
 fi
 
+if [ -n "$KOPT_nbd" ]; then
+	configure_ip
+	setup_nbd || echo "Failed to setup nbd device."
+fi
+
 # check if root=... was set
 if [ -n "$KOPT_root" ]; then
 	if [ "$SINGLEMODE" = "yes" ]; then
-- 
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