From: François Chavant <francois@chavant.info>
Date: Fri, 7 May 2021 15:58:11 +0000 (+0200)
Subject: build: kernel2minor: work around path length limit
X-Git-Tag: v21.02.0-rc3~48
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=1a41b88803366fdd8eaf773c4a10e41a0e8947db;p=openwrt%2Fopenwrt.git

build: kernel2minor: work around path length limit

When building for MikroTik devices the kernel2minor tool will sometimes
fail with:

  Can't get lstat from kernel file!: No such file or directory.

This is because kernel2minor expects paths no longer than 250 chars.
To work around this the include/image-commands.mk has been modified
to copy the kernel to a temporary file (/tmp/tmp.XXXXXXXXXX) before
calling kernel2minor.

Signed-off-by: François Chavant <francois@chavant.info>
(cherry picked from commit 5a9608102b3c444d0c963255f9d016a1d5469d5d)
---

diff --git a/include/image-commands.mk b/include/image-commands.mk
index 51e745958e..4d54a14ba4 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -240,8 +240,11 @@ define Build/jffs2
 endef
 
 define Build/kernel2minor
-	kernel2minor -k $@ -r $@.new $(1)
-	mv $@.new $@
+	$(eval temp_file := $(shell mktemp))
+	cp $@ $(temp_file)
+	kernel2minor -k $(temp_file) -r $(temp_file).new $(1)
+	mv $(temp_file).new $@
+	rm -f $(temp_file)
 endef
 
 define Build/kernel-bin