[openwrt/openwrt] build: image: return sizes if check-size fails

[LEDE Commits]

adrian pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/1d9542c50e2c263256446170ffbd29d0e15bb96d

commit 1d9542c50e2c263256446170ffbd29d0e15bb96d
Author: Adrian Schmutzler <freifunk at adrianschmutzler.de>
AuthorDate: Wed Jul 29 21:00:12 2020 +0200

    build: image: return sizes if check-size fails
    
    Instead of just printing a warning that an image is too big, also
    print both actual size and limit in the string:
    
    WARNING: Image file somename.bin is too big: 2096101 > 1048576
    
    Since the kernel size is checked via the same function (if
    KERNEL_SIZE is specified), this will also apply to the kernel
    image size check.
    
    Signed-off-by: Adrian Schmutzler <freifunk at adrianschmutzler.de>
---
 include/image-commands.mk | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/image-commands.mk b/include/image-commands.mk
index 9281b91990..8ed705a7f4 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -269,8 +269,10 @@ define Build/xor-image
 endef
 
 define Build/check-size
-	@[ $$(($(subst k,* 1024,$(subst m, * 1024k,$(if $(1),$(1),$(IMAGE_SIZE)))))) -ge "$$(stat -c%s $@)" ] || { \
-		echo "WARNING: Image file $@ is too big" >&2; \
+	@imagesize="$$(stat -c%s $@)"; \
+	limitsize="$$(($(subst k,* 1024,$(subst m, * 1024k,$(if $(1),$(1),$(IMAGE_SIZE))))))"; \
+	[ $$limitsize -ge $$imagesize ] || { \
+		echo "WARNING: Image file $@ is too big: $$imagesize > $$limitsize" >&2; \
 		rm -f $@; \
 	}
 endef