initramfs: Don't overwrite $(TARGET_DIR)/init if it exists

Closes #2443

Allow use of custom init scripts.

Signed-off-by: Simon Pasch <fpasch@googlemail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

CHANGES

@@ -27,6 +27,7 @@
 
 	#635:  util-linux fails to build in 2009.08
 	#2239: netcat package installs its binary to target as avr32-linux...
+	#2443: Initramfs: Don't overwrite $(TARGET_DIR)/init if it exists
 	#2449: Minor fixes for squashfs makefile and correct PowerPC e500 ...
 
 2010.08-rc1, Released July 30th, 2010:

fs/initramfs/initramfs.mk

@@ -13,8 +13,9 @@ INITRAMFS_TARGET:= #nothing
 endif
 
 define ROOTFS_INITRAMFS_INIT_SYMLINK
-	rm -f $(TARGET_DIR)/init
-	ln -s sbin/init $(TARGET_DIR)/init
+	if [ ! -e $(TARGET_DIR)/init ]; then \
+		ln -s sbin/init $(TARGET_DIR)/init; \
+	fi
 endef
 
 ROOTFS_INITRAMFS_PRE_GEN_HOOKS += ROOTFS_INITRAMFS_INIT_SYMLINK