Change timestamp format

The old format is precision to seconds, which is too much. The new
format allows you to see a more precise time period.

Signed-off-by: Alexey Gladkov <gladkov.alexey@gmail.com>

Author: legionus

mk/main.mk.in

@@ -51,7 +51,7 @@ include @projectdir@/mk/packimage.mk
 endif
 
 ifneq ($(call in-goals,process-config),)
-STARTUP_TIME   = $(shell date +'%s')
+STARTUP_TIME   = $(shell date -u +'%s%N')
 WORKDIR_SUFFIX = $(basename $(notdir $(INITRD_CONFIG)))
 endif
 

tools/msg-timestamp

@@ -1,4 +1,28 @@
 #!/bin/bash -efu
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-echo "[$(date -u -d "@$(($(date +'%s') - ${STARTUP_TIME:-0}))" +"%T")]"
+export LANG=C
+export LC_ALL=C
+
+duration="0"
+suffix="s"
+
+if [ "${STARTUP_TIME:-0}" -gt 0 ]; then
+	us=$(( $(date -u '+%s%N') / 1000    ))
+	us=$(( $us - ($STARTUP_TIME / 1000) ))
+
+	m=( 3600000000 60000000 1000000 1000  0  )
+	s=( h          m        s       ms    us )
+
+	for (( i = 0; $i < ${#m[@]}; i++ )) do
+		if [ $us -gt ${m[$i]} ]; then
+			[ ${m[$i]} -ne 0 ] &&
+				printf -v duration '%g' "$(($us / ${m[$i]})).$(($us / (${m[$i]} / 100) % 100))" ||
+				printf -v duration '%d' "$us" ||:
+			suffix="${s[$i]}"
+			break
+		fi
+	done
+fi
+
+printf '[%9s ]\n' "${duration}${suffix}"