From 4993c83bcb9f78a1db246b348c5402fb93ea8897 Mon Sep 17 00:00:00 2001
From: Jan Luebbe <jluebbe@debian.org>
Date: Wed, 27 May 2015 22:50:30 +0200
Subject: [PATCH] initramfs-rauc-slot: add recipe to boot a slot using aufs2

This uses the "initramfs-framework" from oe-core.

Signed-off-by: Jan Luebbe <jluebbe@debian.org>
---
 .../initrdscripts/initramfs-rauc-slot.bb      | 31 ++++++++++++++
 .../initrdscripts/initramfs-rauc-slot/overlay | 42 +++++++++++++++++++
 .../initrdscripts/initramfs-rauc-slot/rescue  | 13 ++++++
 3 files changed, 86 insertions(+)
 create mode 100644 recipes-core/initrdscripts/initramfs-rauc-slot.bb
 create mode 100644 recipes-core/initrdscripts/initramfs-rauc-slot/overlay
 create mode 100644 recipes-core/initrdscripts/initramfs-rauc-slot/rescue

diff --git a/recipes-core/initrdscripts/initramfs-rauc-slot.bb b/recipes-core/initrdscripts/initramfs-rauc-slot.bb
new file mode 100644
index 0000000..62c96d5
--- /dev/null
+++ b/recipes-core/initrdscripts/initramfs-rauc-slot.bb
@@ -0,0 +1,31 @@
+SUMMARY = "Modular initramfs system components for RAUC"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+
+PR = "r0"
+
+inherit allarch
+
+SRC_URI = "file://overlay \
+           file://rescue"
+
+do_install() {
+    install -d ${D}/init.d
+
+    # overlay
+    install -m 0755 ${WORKDIR}/overlay ${D}/init.d/20-overlay
+
+    # rescue
+    install -m 0755 ${WORKDIR}/rescue ${D}/init.d/10-rescue
+}
+
+PACKAGES = "initramfs-module-rauc-overlay \
+            initramfs-module-rauc-rescue"
+
+SUMMARY_initramfs-module-rauc-overlay = "initramfs support for overlayfs (ubifs&squashfs)"
+RDEPENDS_initramfs-module-rauc-overlay = "initramfs-framework-base"
+FILES_initramfs-module-rauc-overlay = "/init.d/20-overlay"
+
+SUMMARY_initramfs-module-rauc-rescue = "initramfs rescue mode support"
+RDEPENDS_initramfs-module-rauc-rescue = "initramfs-framework-base"
+FILES_initramfs-module-rauc-rescue = "/init.d/10-rescue"
diff --git a/recipes-core/initrdscripts/initramfs-rauc-slot/overlay b/recipes-core/initrdscripts/initramfs-rauc-slot/overlay
new file mode 100644
index 0000000..b1260f6
--- /dev/null
+++ b/recipes-core/initrdscripts/initramfs-rauc-slot/overlay
@@ -0,0 +1,42 @@
+#!/bin/sh
+
+overlay_enabled() {
+	return 0
+}
+
+overlay_run() {
+	info "Mounting slot..."
+	mkdir /slot
+	if [ -z "$bootparam_root" ]; then
+		fatal "ERROR: No root device was provided."
+	fi
+	mount -o ro $bootparam_root /slot || fatal "Failed!"
+	info "Mounting squashfs..."
+	mkdir /ro-root
+	mount -t squashfs -o loop=/dev/loop0,ro /slot/rootfs.squashfs /ro-root || fatal "Failed!"
+	info "Mounting tmpfs..."
+	mkdir /rw-root
+	mount -t tmpfs -o size=25%,mode=1777,uid=0,gid=0,rw tmpfs /rw-root || fatal "Failed!"
+	if grep -q aufs /proc/filesystems; then
+		info "Mounting aufs..."
+		mount -t aufs -o br=/rw-root:/ro-root aufs /rootfs || fatal "Failed!"
+	else
+		info "Mounting overlayfs..."
+		mkdir /rw-root/root
+		mkdir /rw-root/work
+		mount -t overlayfs -o lowerdir=/ro-root,upperdir=/rw-root/root,workdir=/rw-root/work overlayfs /rootfs || fatal "Failed!"
+	fi
+	if [ -e /slot/overlay.tar.bz2 ]; then
+		info "Extracting overlay..."
+		tar xf /slot/overlay.tar.bz2 -C /rootfs || fatal "Failed!"
+	fi
+	info "Moving overlay components..."
+	mkdir /rootfs/slot
+	mkdir /rootfs/ro-root
+	mkdir /rootfs/rw-root
+	mount --move /slot /rootfs/slot
+	mount --move /ro-root /rootfs/ro-root
+	mount --move /rw-root /rootfs/rw-root
+	# rootfs is already handled
+	bootparam_root=
+}
diff --git a/recipes-core/initrdscripts/initramfs-rauc-slot/rescue b/recipes-core/initrdscripts/initramfs-rauc-slot/rescue
new file mode 100644
index 0000000..3ce0745
--- /dev/null
+++ b/recipes-core/initrdscripts/initramfs-rauc-slot/rescue
@@ -0,0 +1,13 @@
+#!/bin/sh
+
+rescue_enabled() {
+	if [ ! -f "/sbin/init" ]; then
+		return 1
+	fi
+	return 0
+}
+
+rescue_run() {
+	info "Starting /sbin/init..."
+	exec /sbin/init
+}