[ptxdist] [PATCH 3/3] barebox_mlo: add option for building barebox_mlo reproducibly

["Baeuerle, Florian" <Florian.Baeuerle@allegion.com>]

Signed-off-by: Florian Bäuerle <florian.baeuerle@allegion.com>
---
 platforms/barebox_mlo.in | 11 +++++++++++
 rules/barebox_mlo.make   | 29 ++++++++++++++++++++++++++++-
 2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/platforms/barebox_mlo.in b/platforms/barebox_mlo.in
index 01c8669bc..7c3266d0b 100644
--- a/platforms/barebox_mlo.in
+++ b/platforms/barebox_mlo.in
@@ -1,6 +1,7 @@
 ## SECTION=bootloader
 
 menuconfig BAREBOX_MLO
+	select HOST_FAKETIME if BAREBOX_MLO_REPRODUCIBLE
 	prompt "barebox mlo                   "
 	bool
 	help
@@ -33,4 +34,14 @@ config BAREBOX_MLO_CONFIG
 	help
 	  This entry specifies the .config file used to compile mlo.
 
+config BAREBOX_MLO_REPRODUCIBLE
+	prompt "build reproducibly"
+	bool
+	default BAREBOX_REPRODUCIBLE		if BAREBOX
+	default n				if !BAREBOX
+	help
+	  With this, fake timestamps are injected to the barebox build, so the
+	  resulting barebox images are identical when the sources haven't been
+	  changed.
+
 endif
diff --git a/rules/barebox_mlo.make b/rules/barebox_mlo.make
index 368da0e8f..8c0c07664 100644
--- a/rules/barebox_mlo.make
+++ b/rules/barebox_mlo.make
@@ -38,8 +38,25 @@ BAREBOX_MLO_WRAPPER_BLACKLIST := \
 	TARGET_DEBUG \
 	TARGET_BUILD_ID
 
+BAREBOX_MLO_ENV	:= \
+	KCONFIG_NOTIMESTAMP=1 \
+	pkg_wrapper_blacklist="$(BAREBOX_MLO_WRAPPER_BLACKLIST)"
+
+ifdef PTXCONF_BAREBOX_MLO_REPRODUCIBLE
+BAREBOX_MLO_FAKE_TIMESTAMP := \
+	$(shell echo $(BAREBOX_MLO_VERSION) | \
+		sed -E "s/([0-9]{4})\.([0-9]{1,2}).*/\1-\2-01 00:00:00/")
+BAREBOX_MLO_FAKETIME := faketime -f "$(BAREBOX_MLO_FAKE_TIMESTAMP)"
+BAREBOX_MLO_ENV := $(BAREBOX_MLO_ENV) \
+	KBUILD_BUILD_TIMESTAMP="$(BAREBOX_MLO_FAKE_TIMESTAMP)" \
+	KBUILD_BUILD_VERSION="0" \
+	KBUILD_BUILD_USER="ptxdist" \
+	KBUILD_BUILD_HOST="ptxdist"
+else
+BAREBOX_MLO_FAKETIME :=
+endif
+
 BAREBOX_MLO_PATH	:= PATH=$(CROSS_PATH)
-BAREBOX_MLO_CONF_ENV	:= KCONFIG_NOTIMESTAMP=1
 BAREBOX_MLO_CONF_TOOL	:= kconfig
 BAREBOX_MLO_CONF_OPT	:= \
 			V=$(PTXDIST_VERBOSE) \
@@ -62,6 +79,16 @@ endif
 
 $(STATEDIR)/barebox_mlo.prepare: $(BAREBOX_MLO_CONFIG)
 
+# ----------------------------------------------------------------------------
+# Compile
+# ----------------------------------------------------------------------------
+
+$(STATEDIR)/barebox_mlo.compile:
+	@$(call targetinfo)
+	cd $(BAREBOX_MLO_DIR) && $(BAREBOX_MLO_PATH) $(BAREBOX_MLO_ENV) \
+		$(BAREBOX_MLO_FAKETIME) $(MAKE) $(BAREBOX_MLO_MAKE_OPT)
+	@$(call touch)
+
 # ----------------------------------------------------------------------------
 # Install
 # ----------------------------------------------------------------------------
-- 
2.19.0

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