[package] base/block-extroot, base/block-mount: Modified preinit and block-extroot and

block-mount so that use of block-mount and block-extroot do not require that block-extroot,
block-mount, nor the kernel modules they depend, on are required to included in the image.
That is block-extroot and dependencies may now be installed as modules onto the jffs2 part of
a squashfs system and it will work. 
In addition packages which are installed into the jffs2 of a squashfs system may now affect
preinit, so long as they do not require execution of commands that occur before the merging of
the jffs2 and built-in (squashfs) preinit scripts is done.

Thanks jow for the preinit merge stuff!



git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23110 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/files/lib/functions/boot.sh

@@ -6,19 +6,66 @@ mount() {
 	/bin/busybox mount "$@"
 }
 
+boot_hook_splice_start() {
+	export -n PI_HOOK_SPLICE=1
+}
+
+boot_hook_splice_finish() {
+	local hook
+	for hook in $PI_STACK_LIST; do
+		local v; eval "v=\${${hook}_splice:+\$${hook}_splice }$hook"
+		export -n "${hook}=${v% }"
+		export -n "${hook}_splice="
+	done
+	export -n PI_HOOK_SPLICE=
+}
+
+boot_hook_init() {
+	local hook="${1}_hook"
+	export -n "PI_STACK_LIST=${PI_STACK_LIST:+$PI_STACK_LIST }$hook"
+	export -n "$hook="
+}
+
 boot_hook_add() {
-    	local hook="${1}_hook"
-	local value="$2"
-	local sep=" "
-	
-	eval "$hook=\"\${$hook:+\${$hook}\${value:+\$sep}}\$value\""
+	local hook="${1}_hook${PI_HOOK_SPLICE:+_splice}"
+	local func="${2}"
+
+	[ -n "$func" ] && {
+		local v; eval "v=\$$hook"
+		export -n "$hook=${v:+$v }$func"
+	}
+}
+
+boot_hook_shift() {
+	local hook="${1}_hook"
+	local rvar="${2}"
+
+	local v; eval "v=\$$hook"
+	[ -n "$v" ] && {
+		local first="${v%% *}"
+
+		[ "$v" != "${v#* }" ] && \
+			export -n "$hook=${v#* }" || \
+			export -n "$hook="
+
+		export -n "$rvar=$first"
+		return 0
+	}
+
+	return 1
 }
 
 boot_run_hook() {
-    local boot_func
-    for boot_func in $(eval "echo \"\$${1}_hook\""); do
-	$boot_func "$1" "$2"
-    done
+	local hook="$1"
+	local func
+
+	while boot_hook_shift "$hook" func; do
+		local ran; eval "ran=\$PI_RAN_$func"
+		[ -n "$ran" ] || {
+			export -n "PI_RAN_$func=1"
+			$func "$1" "$2"
+		}
+	done
 }
 
 find_mtd_part() {
@@ -99,15 +146,3 @@ ramoverlay() {
 	fopivot /tmp/root /rom 1
 }
 
-pi_include() {
-	if [ -f "/tmp/overlay/$1" ]; then
-		. "/tmp/overlay/$1"
-	elif [ -f "$1" ]; then
-		. "$1"
-	else
-		echo "WARNING: $1 not found"
-		return 1
-	fi
-	return 0
-}
-