From: Maximilian Engelhardt <maxi@daemonizer.de>
Date: Fri, 18 Dec 2020 20:42:35 +0000 (+0100)
Subject: docs: set date to SOURCE_DATE_EPOCH if available
X-Git-Tag: archive/raspbian/4.16.0+51-g0941d6cb-1+rpi1~2^2^2~2
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=2f68f0e5a17cbe36c2f4d853cb5ffc5a66f618f8;p=xen.git

docs: set date to SOURCE_DATE_EPOCH if available

Use the solution described in [1] to replace the call to the 'date'
command with a version that uses SOURCE_DATE_EPOCH if available. This
is needed for reproducible builds.

[1] https://reproducible-builds.org/docs/source-date-epoch/

Signed-off-by: Maximilian Engelhardt <maxi@daemonizer.de>

[Hans van Kranenburg]
Note: this patch is submitted upstream but not committed yet. We
expect that it gets in. Otherwise, we don't wait and already have it
here because I want to have the reproducible build work completed.
---

diff --git a/docs/Makefile b/docs/Makefile
index 8de1efb6f5..ac6792ff7c 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -3,7 +3,13 @@ include $(XEN_ROOT)/Config.mk
 -include $(XEN_ROOT)/config/Docs.mk
 
 VERSION		:= $(shell $(MAKE) -C $(XEN_ROOT)/xen --no-print-directory xenversion)
-DATE		:= $(shell date +%Y-%m-%d)
+
+DATE_FMT	:= +%Y-%m-%d
+ifdef SOURCE_DATE_EPOCH
+DATE		:= $(shell date -u -d "@$(SOURCE_DATE_EPOCH)" "$(DATE_FMT)" 2>/dev/null || date -u -r "$(SOURCE_DATE_EPOCH)" "$(DATE_FMT)" 2>/dev/null || date -u "$(DATE_FMT)")
+else
+DATE		:= $(shell date "$(DATE_FMT)")
+endif
 
 DOC_ARCHES      := arm x86_32 x86_64
 MAN_SECTIONS    := 1 5 7 8