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build: add image makefile helper function for pading with an offset
author
nbd
<nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Sat, 17 Jan 2015 21:19:24 +0000
(21:19 +0000)
committer
nbd
<nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Sat, 17 Jan 2015 21:19:24 +0000
(21:19 +0000)
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@44012
3c298f89
-4303-0410-b956-
a3cf2f4a3e73
include/image.mk
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diff --git
a/include/image.mk
b/include/image.mk
index
e640201
..
06feef5
100644
(file)
--- a/
include/image.mk
+++ b/
include/image.mk
@@
-307,6
+307,17
@@
define Build/pad-rootfs
$(call prepare_generic_squashfs,$@)
endef
+define Build/pad-offset
+ let \
+ size="$$(stat -c%s $@)" \
+ pad="$(word 1, $(1))" \
+ offset="$(word 2, $(1))" \
+ pad="(pad - ((size + offset) % pad)) % pad" \
+ newsize='size + pad'; \
+ dd if=$@ of=$@.new bs=$$newsize count=1 conv=sync
+ mv $@.new $@
+endef
+
define Build/check-size
@[ $$(($(subst k,* 1024,$(subst m, * 1024k,$(1))))) -gt "$$(stat -c%s $@)" ] || { \
echo "WARNING: Image file $@ is too big"; \