Added build variable HAIKU_DONT_CLEAR_IMAGE. When set and the image does

already exist, it won't be zeroed out. The image will still be
initialized with BFS, though. Handy for installing Haiku on a partition.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22397 a95241bf-73f2-0310-859d-f6bbb57e9c96

build/scripts/build_haiku_image

@@ -11,6 +11,7 @@
 # addBuildCompatibilityLibDir
 # sourceDirsToCopy
 # updateOnly
+# dontClearImage
 # 
 # bfsShell
 # copyattr
@@ -83,7 +84,9 @@ if [ $isImage ]; then
 	echo
 	if [ ! $updateOnly ]; then
 		echo "Creating image ..."
-		dd if=/dev/zero of=$imagePath bs=1048576 count=$imageSize
+		if [ ! -f $imagePath -o ! "$dontClearImage" ]; then
+			dd if=/dev/zero of=$imagePath bs=1048576 count=$imageSize
+		fi
 		$bfsShell --initialize $imagePath Haiku
 		$makebootable $imagePath
 	fi