Makefile.sdcard

SDCARD_DEV = $(shell blkid -c /dev/null -L boot -n vfat | head -1 )
SDCARD_MNT = $(DRAFTS_DIR)/sdcard-mnt
DIRECTORIES += $(SDCARD_MNT)

# With this variable you can control what goes into the sdcard.
SDCARD_FILES = $(SDCARD_MNT)/BOOT.bin $(SDCARD_MNT)/devicetree.dtb $(SDCARD_MNT)/uImage $(SDCARD_MNT)/uramdisk.image.gz $(SDCARD_MNT)/uEnv.txt

SDCARD_MOUNT_OPTS = "rw,nosuid,nodev,uid=517,gid=500,shortname=mixed,dmask=0077,utf8=1,showexec,flush,uhelper=udisks"

with-sdcard-dev = if [ -n "$(SDCARD_DEV)" ]; then ($(1)); else echo "[ERROR] Couldn't find sdcard device."; false; fi;
sdcard-if-mnt = $(call with-sdcard-dev, if mount -l | grep $(SDCARD_DEV) > /dev/null; then ($(1)); fi)
sdcard-if-not-mnt = $(call with-sdcard-dev, if ! mount -l | grep $(SDCARD_DEV) > /dev/null ; then ($(1)); fi)
sdcard-if-mnt-nonlocal = $(call with-sdcard-dev, if mount -l | grep $(SDCARD_DEV) > /dev/null && ! mount -l | grep $(SDCARD_DEV) | grep $(SDCARD_MNT) > /dev/null; then ($(1)); fi)


.PHONY:
sdcard-unmount-maybe: | $(SDCARD_DEV)
	$(call sdcard-if-mnt-nonlocal, sudo umount $(SDCARD_DEV))

.PHONY:
sdcard-unmount: | $(SDCARD_DEV)
	$(call sdcard-if-mnt, sudo umount $(SDCARD_DEV))

.PHONY:
sdcard-mount: sdcard-unmount-maybe | $(SDCARD_DEV) $(SDCARD_MNT)
	$(call sdcard-if-not-mnt, sudo mount -o $(SDCARD_MOUNT_OPTS) $(SDCARD_DEV) $(SDCARD_MNT))
	@echo "SDcard $(SDCARD_DEV) mounted at $(SDCARD_MNT)"

.PHONY:
sdcard-ls: sdcard-mount
	ls $(SDCARD_MNT)


sdcard_backup_dir=$(SDCARD_MNT)/backup.$(shell date +%F_%H.%M.%S)

DIRECTORIES += $(sdcard_backup_dir)
.PHONY:
sdcard-backup: $(SDCARD_FILES:$(SDCARD_MNT)/%=$(sdcard_backup_dir)/%) sdcard-cleanup-backup-dirs

$(sdcard_backup_dir)/%: sdcard-mount
	cp $@ $(SDCARD_MNT)/$* 2> /dev/null || echo "Didn't find $* in sdcard"

.PHONY:
sdcard-cleanup-backup-dirs:
	# Cleanup of empty backup directories.
	for bakdir in $(SDCARD_MNT)/backup.*; do \
		rmdir $$bakdir 2> /dev/null || echo "$$bakdir is valid backup"; \
	done

.SECONDEXPANSION:
$(SDCARD_FILES): $$(patsubst $(SDCARD_MNT)/%, $(RESOURCES_DIR)/%, $$@) sdcard-backup
	cp $< $@

.PHONY:
sdcard: $(SDCARD_FILES) sdcard-unmount