From 27854a0a84cd2db9539b662a1f1fc95ef7409962 Mon Sep 17 00:00:00 2001
From: Jo-Philipp Wich <jo@mein.io>
Date: Tue, 26 Jul 2016 15:05:35 +0200
Subject: [PATCH] build: add checksum target

Add a new "checksum" make target which generates an sha256sums file over the
image files produced in bin/targets/ and automatically call it during make
world after the package index generation.

The advantage of this new target is that it is guaranteed to run after the
images, the SDK and the ImageBuilder archives have been generated to ensure
that they all end up in the checksum file. Fixes FS#51.

Uses sed to postprocess the OpenSSL digest output into an sha256sum command
compatible format.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
---
 Makefile                           | 4 ++++
 rules.mk                           | 7 +++++++
 target/imagebuilder/files/Makefile | 6 ++++++
 3 files changed, 17 insertions(+)

diff --git a/Makefile b/Makefile
index c3e1ed77076..5bd4fb2ca71 100644
--- a/Makefile
+++ b/Makefile
@@ -83,9 +83,13 @@ prereq: $(target/stamp-prereq) tmp/.prereq_packages
 		exit 1; \
 	fi
 
+checksum: FORCE
+	$(call sha256sums,$(BIN_DIR))
+
 prepare: .config $(tools/stamp-install) $(toolchain/stamp-install)
 world: prepare $(target/stamp-compile) $(package/stamp-compile) $(package/stamp-install) $(target/stamp-install) FORCE
 	$(_SINGLE)$(SUBMAKE) -r package/index
+	$(_SINGLE)$(SUBMAKE) -r checksum
 
 .PHONY: clean dirclean prereq prepare world package/symlinks package/symlinks-install package/symlinks-clean
 
diff --git a/rules.mk b/rules.mk
index 12a79ba30c2..de247786142 100644
--- a/rules.mk
+++ b/rules.mk
@@ -371,6 +371,13 @@ define file_copy
 	$(CP) $(1) $(2)
 endef
 
+# Calculate sha256sum of any plain file within a given directory
+# $(1) => Input directory
+define sha256sums
+	(cd $(1); find . -maxdepth 1 -type f -not -name 'sha256sums' -printf "%P\n" | sort | \
+		xargs openssl dgst -sha256 | sed -ne 's!^SHA256(\(.*\))= \(.*\)$$!\2 *\1!p' > sha256sums)
+endef
+
 # file extension
 ext=$(word $(words $(subst ., ,$(1))),$(subst ., ,$(1)))
 
diff --git a/target/imagebuilder/files/Makefile b/target/imagebuilder/files/Makefile
index 44439854d69..493012ff720 100644
--- a/target/imagebuilder/files/Makefile
+++ b/target/imagebuilder/files/Makefile
@@ -125,6 +125,7 @@ ifneq ($(USER_FILES),)
 endif
 	$(MAKE) package_postinst
 	$(MAKE) build_image
+	$(MAKE) checksum
 
 package_index: FORCE
 	@echo
@@ -170,6 +171,11 @@ build_image: FORCE
 	$(NO_TRACE_MAKE) -C target/linux/$(BOARD)/image install TARGET_BUILD=1 IB=1 EXTRA_IMAGE_NAME="$(EXTRA_IMAGE_NAME)" \
 		$(if $(USER_PROFILE),PROFILE="$(USER_PROFILE)")
 
+checksum: FORCE
+	@echo
+	@echo Calculating checksums...
+	@$(call sha256sums,$(BIN_DIR))
+
 clean:
 	rm -rf $(TMP_DIR) $(DL_DIR) $(TARGET_DIR) $(BIN_DIR)