Add config file and force timestamp conditional option

sysa/helpers.sh

@@ -3,6 +3,7 @@
 # SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
 # SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
 # SPDX-FileCopyrightText: 2021 Paul Dersey <pdersey@gmail.com>
+# SPDX-FileCopyrightText: 2021 Melg Eight <public.melg8@gmail.com>
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -149,3 +150,11 @@ call() {
 default() {
     "default_${build_stage}"
 }
+
+# Set all files modified dates to be 0 unix time.
+# Should be called at the end of bootstrapping process.
+# This function needs `touch` that supports --no-dereference
+# (at least coreutils 8.1).
+canonicalise_all_files_timestamp() {
+    find / -exec touch --no-dereference -t 197001010000.00 {} +
+}

sysa/run2.sh

@@ -11,6 +11,8 @@ set -e
 
 . helpers.sh
 
+. bootstrap.cfg
+
 build xz-5.0.5
 
 build automake-1.11.2
@@ -31,6 +33,11 @@ build mpfr-4.1.0
 
 build mpc-1.2.1
 
+if [ "$FORCE_TIMESTAMPS" = True ] ; then
+    echo 'Forcing all files timestamps to be 0 unix time.'
+    canonicalise_all_files_timestamp
+fi
+
 echo "Bootstrapping completed."
 
 exec env - PATH=/after/bin PS1="\w # " bash -i