add preinit modularization work by Daniel Dickinson (cshore)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19331 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 95 insertions, 0 deletions

diff --git a/package/base-files/files/lib/functions/boot.sh b/package/base-files/files/lib/functions/boot.sh
new file mode 100644
index 000000000..46b461330
--- /dev/null
+++ b/package/base-files/files/lib/functions/boot.sh
@@ -0,0 +1,95 @@
+#!/bin/sh
+# Copyright (C) 2006-2010 OpenWrt.org
+# Copyright (C) 2010 Vertical Communications
+
+boot_hook_add() {
+    	local hook="${1}_hook"
+	local value="$2"
+	local sep=" "
+	
+	eval "$hook=\"\${$hook:+\${$hook}\${value:+\$sep}}\$value\""
+}
+
+boot_run_hook() {
+    local boot_func
+    for boot_func in $(eval "echo \"\$${1}_hook\""); do
+	$boot_func "$1" "$2"
+    done
+}
+
+find_mtd_part() {
+	local PART="$(grep "\"$1\"" /proc/mtd | awk -F: '{print $1}')"
+	local PREFIX=/dev/mtdblock
+	
+	PART="${PART##mtd}"
+	[ -d /dev/mtdblock ] && PREFIX=/dev/mtdblock/
+	echo "${PART:+$PREFIX$PART}"
+}
+
+jffs2_ready () {
+    mtdpart="$(find_mtd_part rootfs_data)"
+    magic=$(hexdump $mtdpart -n 4 -e '4/1 "%02x"')
+    [ "$magic" != "deadc0de" ]
+}
+
+dupe() { # <new_root> <old_root>
+	cd $1
+	echo -n "creating directories... "
+	{
+		cd $2 
+		find . -xdev -type d
+		echo "./dev ./jffs ./mnt ./proc ./tmp"
+		# xdev skips mounted directories
+		cd $1 
+	} | xargs mkdir -p
+	echo "done"
+
+	echo -n "setting up symlinks... "
+	for file in $(cd $2; find . -xdev -type f;); do
+		case "$file" in
+		./rom/note) ;; #nothing
+		./etc/config*|\
+		./usr/lib/opkg/info/*) cp -af $2/$file $file;;
+		*) ln -sf /rom/${file#./*} $file;;
+		esac
+	done
+	for file in $(cd $2; find . -xdev -type l;); do
+		cp -af $2/${file#./*} $file
+	done
+	echo "done"
+}
+
+pivot() { # <new_root> <old_root>
+	mount -o move /proc $1/proc && \
+	pivot_root $1 $1$2 && {
+		mount -o move $2/dev /dev
+		mount -o move $2/tmp /tmp
+		mount -o move $2/sys /sys 2>&-
+		mount -o move $2/jffs /jffs 2>&-
+		return 0
+	}
+}
+
+fopivot() { # <rw_root> <ro_root> <dupe?>
+	root=$1
+	{
+		if grep -q mini_fo /proc/filesystems; then
+			mount -t mini_fo -o base=/,sto=$1 "mini_fo:$1" /mnt 2>&- && root=/mnt
+		else
+			mount --bind / /mnt
+			mount --bind -o union "$1" /mnt && root=/mnt 
+		fi
+	} || {
+		[ "$3" = "1" ] && {
+		mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1
+		dupe $1 $rom
+		}
+	}
+	pivot $root $2
+}
+
+ramoverlay() {
+	mkdir -p /tmp/root
+	mount -t tmpfs root /tmp/root
+	fopivot /tmp/root /rom 1
+}