alpine.mk: configureable free space on usb image
use USBIMG_FREE to set how many kB you want to have as free space on usb image.
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@ -229,7 +229,8 @@ $(ISO_SHA1): $(ISO)
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# USB image
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#
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USBIMG := $(ALPINE_NAME)-$(ALPINE_RELEASE)-$(ALPINE_ARCH).img
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USBIMG_SIZE = $(shell echo $$(( `du -s $(ISO_DIR) | awk '{print $$1}'` + 8192 )) )
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USBIMG_FREE ?= 8192
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USBIMG_SIZE = $(shell echo $$(( `du -s $(ISO_DIR) | awk '{print $$1}'` + $(USBIMG_FREE) )) )
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MBRPATH := /usr/share/syslinux/mbr.bin
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# the offset where the frist partition is found
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USBIMG_OFFSET := 16384
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