From 75df431b9458615bea97a50d2d578c3821833ab9 Mon Sep 17 00:00:00 2001
From: Lucio Andrés Illanes Albornoz <lucio@lucioillanes.de>
Date: Dec 23 2018 16:00:17 +0000
Subject: subr/build_init.subr:build_init(): rename build logs from previous builds w/ appended modification time postfix.

subr/build_init.subr:build_init(): turn ${DEFAULT_BUILD_LOG_LAST_FNAME} into symbolic link to last previous build log.

---

diff --git a/subr/build_init.subr b/subr/build_init.subr
index a76b9c4..7e52a28 100644
--- a/subr/build_init.subr
+++ b/subr/build_init.subr
@@ -9,7 +9,7 @@ build_fini() {
 };
 
 build_init() {
-	local __="" _env_vars="" _env_vars_except="" _env_var="";
+	local __="" _env_vars="" _env_vars_except="" _env_var="" _log_last_fname="" _log_last_ts="";
 	set -o noglob; umask 022;
 	if [ -z "${DEFAULT_BUILD_CPUS}" ]\
 	&& [ -e /proc/cpuinfo ]; then
@@ -65,7 +65,11 @@ build_init() {
 		touch "${DEFAULT_BUILD_STATUS_IN_PROGRESS_FNAME}";
 	fi;
 	if [ -e "${DEFAULT_BUILD_LOG_FNAME}" ]; then
-		ex_rtl_fileop mv "${DEFAULT_BUILD_LOG_FNAME}" "${DEFAULT_BUILD_LOG_LAST_FNAME}";
+		_log_last_ts="$(stat -c %Y "${DEFAULT_BUILD_LOG_FNAME}")";
+		_log_last_ts="$(awk 'BEGIN {printf(strftime("%Y-%m-%d-%H-%M-%S", '"${_log_last_ts}"'))}')";
+		_log_last_fname="${DEFAULT_BUILD_LOG_FNAME}.${_log_last_ts}";
+		ex_rtl_fileop mv "${DEFAULT_BUILD_LOG_FNAME}" "${_log_last_fname}";
+		ex_rtl_fileop ln_symbolic "${_log_last_fname}" "${DEFAULT_BUILD_LOG_LAST_FNAME}";
 	fi;
 	ex_rtl_fileop touch "${DEFAULT_BUILD_LOG_FNAME}";
 	BUILD_IS_PARENT=1;