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#############################################################
#
# genext2fs to build to target ext2 filesystems
#
#############################################################
GENEXT2_DIR=$(BUILD_DIR)/genext2fs-1.3.orig
GENEXT2_SOURCE=genext2fs_1.3.orig.tar.gz
GENEXT2_SITE=http://ftp.debian.org/debian/pool/main/g/genext2fs
GENEXT2_PATCH=$(SOURCE_DIR)/genext2fs.patch

$(DL_DIR)/$(GENEXT2_SOURCE):
	$(WGET) -P $(DL_DIR) $(GENEXT2_SITE)/$(GENEXT2_SOURCE)

$(GENEXT2_DIR): $(DL_DIR)/$(GENEXT2_SOURCE) $(GENEXT2_PATCH)
	zcat $(DL_DIR)/$(GENEXT2_SOURCE) | tar -C $(BUILD_DIR) -xvf -
	cat $(GENEXT2_PATCH) | patch -p1 -d $(GENEXT2_DIR)

$(GENEXT2_DIR)/genext2fs: $(GENEXT2_DIR)
	$(MAKE) CFLAGS="-Wall -O2 -D_FILE_OFFSET_BITS=64 -D__USE_FILE_OFFSET64" -C $(GENEXT2_DIR);
	touch -c $(GENEXT2_DIR)/genext2fs

genext2fs: $(GENEXT2_DIR)/genext2fs



#############################################################
#
# Build the ext2 root filesystem image
#
# Known problems :
#  - genext2fs: couldn't allocate a block (no free space)
#  
#    Since genext2fs allocates only one group of blocks, the FS 
#    size is limited to a maximum of 8 Mb.
#
#############################################################

# how much KB we want to add to the calculated size for the root directory,
# to have additional space
GENEXT2_ADDTOROOTSIZE := 256
# maximal rootfilesystem size that can be handled
# by genext2fs
GENEXT2_MAXROOTSIZE := 8192

GENEXT2_REALSIZE=$(subst total,, $(shell du $(TARGET_DIR) -s -c -k | grep total )) 
GENEXT2_SIZE=$(shell expr $(GENEXT2_REALSIZE) + $(GENEXT2_ADDTOROOTSIZE))
# We currently add about 400 device nodes, so add that into the total
GENEXT2_INODES=$(shell expr $(shell find $(TARGET_DIR) | wc -l) + 400)

#ifeq (1,$(shell expr $(GENEXT2_SIZE) \> $(GENEXT2_MAXROOTSIZE)))
#	$(error "Filesystem size, $(GENEXT2_SIZE) KB is greater than the maximum $(GENEXT2_MAXROOTSIZE) KB")
#endif

ext2root: genext2fs
	-@find $(TARGET_DIR)/lib -type f -name \*.so\* | xargs $(STRIP) --strip-unneeded 2>/dev/null || true;
	-@find $(TARGET_DIR) -type f -perm +111 | xargs $(STRIP) 2>/dev/null || true;
	$(GENEXT2_DIR)/genext2fs -i $(GENEXT2_INODES) -b $(GENEXT2_SIZE) \
		-d $(TARGET_DIR) -D $(SOURCE_DIR)/device_table.txt $(IMAGE)

ext2root-source: $(DL_DIR)/$(GENEXT2_SOURCE)

ext2root-clean:
	-make -C $(GENEXT2_DIR) clean

ext2root-dirclean:
	rm -rf $(GENEXT2_DIR)