Make reproducible build possible

For downstream consumption is important to have a way to specify the date or
the user or the hostname to particular values so to have reproducible builds
and/or packages.

Change-Id: I134288662b6cfbbe26bba7d8bc6be8511b34360c
Signed-off-by: Marco Varlese <marco.varlese@suse.com>

diff --git a/src/vpp.am b/src/vpp.am
index d8b3e4e..1c95949 100644 (file)
--- a/src/vpp.am
+++ b/src/vpp.am
@@ -54,6 +54,10 @@ vpp/app/version.o:   vpp/app/version.h
 
 VPP_VERSION = $(shell $(srcdir)/scripts/version)
 
+VPP_BUILD_DATE ?= $$(date)
+VPP_BUILD_USER ?= $$(whoami)
+VPP_BUILD_HOST ?= $$(hostname)
+
 # update version.h only when version changes, to avoid
 # unnecessary re-linking of vpp binary
 
@@ -62,9 +66,9 @@ VPP_VERSION = $(shell $(srcdir)/scripts/version)
          f="vpp/app/version.h"                                                         ;\
          echo "  VERSION  $$f ($(VPP_VERSION))"                                        ;\
          echo $(VPP_VERSION) > .version                                                ;\
-         echo "#define VPP_BUILD_DATE \"$$(date)\"" > $$f                              ;\
-         echo "#define VPP_BUILD_USER \"$$(whoami)\"" >> $$f                           ;\
-         echo "#define VPP_BUILD_HOST \"$$(hostname)\"" >> $$f                         ;\
+          echo "#define VPP_BUILD_DATE \"$(VPP_BUILD_DATE)\"" > $$f                             ;\
+          echo "#define VPP_BUILD_USER \"$(VPP_BUILD_USER)\"" >> $$f                            ;\
+          echo "#define VPP_BUILD_HOST \"$(VPP_BUILD_HOST)\"" >> $$f                            ;\
          echo -n "#define VPP_BUILD_TOPDIR " >> $$f                                    ;\
          echo "\"$$(cd $(srcdir) && git rev-parse --show-toplevel)\"" >> $$f           ;\
          echo "#define VPP_BUILD_VER \"$(VPP_VERSION)\"" >> $$f                        ;\