Author: Luca Boccassi <bluca@debian.org>
Description: Makefile: use fixed build host if SOURCE_DATE_EPOCH is defined
 If SOURCE_DATE_EPOCH is defined then we can be reasonably sure the
 user wants the build to be fully reproducible, so use a fixed string.
 In case of a cross build, using uname -s -m -p -i o will still report
 the host's kernel architecture, which will trip some CIs like
 Debian's.
Forwarded: https://github.com/rhboot/shim/pull/169
--- a/Makefile
+++ b/Makefile
@@ -46,6 +46,12 @@ ifneq ($(origin ENABLE_HTTPBOOT), undefined)
 	SOURCES += httpboot.c include/httpboot.h
 endif
 
+ifeq ($(SOURCE_DATE_EPOCH),)
+	UNAME=$(shell uname -s -m -p -i -o)
+else
+	UNAME=buildhost
+endif
+
 SOURCES = $(foreach source,$(ORIG_SOURCES),$(TOPDIR)/$(source)) version.c
 MOK_SOURCES = $(foreach source,$(ORIG_MOK_SOURCES),$(TOPDIR)/$(source))
 FALLBACK_SRCS = $(foreach source,$(ORIG_FALLBACK_SRCS),$(TOPDIR)/$(source))
@@ -66,7 +72,7 @@ shim_cert.h: shim.cer
 
 version.c : $(TOPDIR)/version.c.in
 	sed	-e "s,@@VERSION@@,$(VERSION)," \
-		-e "s,@@UNAME@@,$(shell uname -s -m -p -i -o)," \
+		-e "s,@@UNAME@@,$(UNAME)," \
 		-e "s,@@COMMIT@@,$(COMMIT_ID)," \
 		< $< > $@