From a7ae81ab1c41f29330bc934afe14c98c33cc663c Mon Sep 17 00:00:00 2001
From: Fabian Keil <fk@fabiankeil.de>
Date: Thu, 14 May 2015 12:07:25 +0200
Subject: [PATCH 056/325] Make reproducing builds more convenient

... by setting the various variables based on the
environment variable REPRO_SEED.

Obtained from: ElectroBSD
---
 Makefile.inc1                      | 14 ++++++--
 release/Makefile                   |  2 ++
 share/mk/src.reproducible-build.mk | 54 ++++++++++++++++++++++++++++++
 3 files changed, 67 insertions(+), 3 deletions(-)
 create mode 100644 share/mk/src.reproducible-build.mk

diff --git a/Makefile.inc1 b/Makefile.inc1
index 1c9058342252..cbe03966dd4a 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -54,6 +54,8 @@
 _MKSHOWCONFIG=	t
 .endif
 
+.include "share/mk/src.reproducible-build.mk"
+
 SRCDIR?=	${.CURDIR}
 LOCALBASE?=	/usr/local
 
@@ -1183,7 +1185,7 @@ WMAKE_TGTS+=	build${libcompat}
 buildworld: buildworld_prologue ${WMAKE_TGTS} buildworld_epilogue .PHONY
 .ORDER: buildworld_prologue ${WMAKE_TGTS} buildworld_epilogue
 
-buildworld_prologue: .PHONY
+buildworld_prologue: .PHONY reproducible_build_hint
 	@echo "--------------------------------------------------------------"
 	@echo ">>> World build started on `LC_ALL=C date`"
 .if ${TARGET:Mmips}
@@ -1192,7 +1194,7 @@ buildworld_prologue: .PHONY
 .endif
 	@echo "--------------------------------------------------------------"
 
-buildworld_epilogue: .PHONY
+buildworld_epilogue: .PHONY reproducible_build_hint
 	@echo
 	@echo "--------------------------------------------------------------"
 	@echo ">>> World build completed on `LC_ALL=C date`"
@@ -1202,6 +1204,12 @@ buildworld_epilogue: .PHONY
 .endif
 	@echo "--------------------------------------------------------------"
 
+reproducible_build_hint:
+	@echo "--------------------------------------------------------------"
+	@echo ">>> To reproduce this build:"
+	@echo ">>>  export REPRO_SEED=$${REPRO_SEED}"
+	@echo "--------------------------------------------------------------"
+
 #
 # We need to have this as a target because the indirection between Makefile
 # and Makefile.inc1 causes the correct PATH to be used, rather than a
@@ -1658,7 +1666,7 @@ ${WMAKE_TGTS:N_worldtmp:Nbuild${libcompat}} ${.ALLTARGETS:M_*:N_worldtmp}: .MAKE
 #
 # Builds all kernels defined by BUILDKERNELS.
 #
-buildkernel: .MAKE .PHONY
+buildkernel: .MAKE .PHONY reproducible_build_hint
 .if empty(BUILDKERNELS:Ndummy)
 	@echo "ERROR: Missing kernel configuration file(s) (${KERNCONF})."; \
 	false
diff --git a/release/Makefile b/release/Makefile
index 95a4c94cc04c..e029d100c125 100644
--- a/release/Makefile
+++ b/release/Makefile
@@ -34,6 +34,8 @@
 #  TARGET/TARGET_ARCH: architecture of built release
 #
 
+.include "../share/mk/src.reproducible-build.mk"
+
 WORLDDIR?=	${.CURDIR}/..
 PORTSDIR?=	/usr/ports
 RELNOTES_LANG?= en_US.ISO8859-1
diff --git a/share/mk/src.reproducible-build.mk b/share/mk/src.reproducible-build.mk
new file mode 100644
index 000000000000..dc4f4df93507
--- /dev/null
+++ b/share/mk/src.reproducible-build.mk
@@ -0,0 +1,54 @@
+##########################################################################
+# Copyright (c) 2015 Fabian Keil <fk@fabiankeil.de>
+#
+# Permission to use, copy, modify, and distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+##########################################################################
+#
+# Make the build reproducible by exporting a bunch of variables,
+# potentionally using an already-set REPRO_SEED as input.
+#
+# The variable names are somewhat stupid, mostly because we
+# are using existing ones.
+#
+##########################################################################
+
+TZ=	"UTC"
+.export TZ
+
+.if ! defined(REPRO_SEED)
+# XXX: Currently we don't add the kernel version number to the repro
+#      seed because we expect a clean object tree in which case it
+#      will reproducible be 0. If the object tree of a the
+#      build-to-reproduce was actually unclean, KERNEL_VERSION_NUMBER
+#      has to be set to a matching value.
+REPRO_SEED!=	echo $$(id -un):$$(hostname):$$(date +%s)
+.export REPRO_SEED
+.else
+.if ! defined(KERNEL_VERSION_NUMBER)
+KERNEL_VERSION_NUMBER=0
+.export KERNEL_VERSION_NUMBER
+.endif
+.endif
+
+USER!=	echo "${REPRO_SEED}" | /usr/bin/cut -d : -f 1
+HOSTNAME!=	echo "${REPRO_SEED}" | /usr/bin/cut -d : -f 2
+EPOCH_DATE!=	echo "${REPRO_SEED}" | /usr/bin/cut -d : -f 3
+
+DATE!=	date -r ${EPOCH_DATE}
+# These two probably are no longer necessary after r285701
+MKREPRO_DATE!=	date -r ${EPOCH_DATE} +"%b %d %Y"
+MKREPRO_TIME!=	date -r ${EPOCH_DATE} +%H:%M:%S
+
+.for v in REPRO_SEED USER HOSTNAME EPOCH_DATE DATE MKREPRO_DATE MKREPRO_TIME
+.export $v
+.endfor
-- 
2.32.0