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#!/bin/bash
###################################################################################################
# convert-date-time-to-utc
###################################################################################################
# Copyright 2017-2023 Jean-Christophe Manciot <jcmanciot@sdxlive.com>
#
# Licensed under a GPLv3 License; you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.gnu.org/licenses/gpl-3.0.md
#
# The licensor cannot revoke these freedoms as long as you follow the license terms.
#
# Attribution — You must give appropriate credit, provide a link to the license, and indicate if
# changes were made. You may do so in any reasonable manner, but not in any way that
# suggests the licensor endorses you or your use.
###################################################################################################
###################################################################################################
#
# Converting the parameter to UTC date time format and rounding up/down the seconds
#
###################################################################################################
#
# Parameters:
# ----------
#
# - <date_time> contains the date time in the same format as the one returned by
# "stat -L -c %y <file>"
#
# - -<anything> will display this help message
#
###################################################################################################
#
# Returned values:
# ---------------
#
# - <utc_date_time> contains the date time in UTC format with the seconds rounded up/down
#
###################################################################################################
#
# Usage example:
# -------------
#
# utc_date_time=$(convert-date-time-to-utc "$(stat -L -c %y .driveignore)")
#
###################################################################################################
if [[ $LOG_CONVERT_DATE_TIME_TO_UTC == ON ]]; then
# Getting the last existing file descriptor of ~/.drive-google/logs/drive-google.log
fd=$(ls -al /proc/$$/fd | grep ~/.drive-google/logs/drive-google.log | sed -E 's|^.* ([0-9]+) -> .*$|\1|g' | sort -V | tail -n 1)
# Case where fd is unset, i.e the file ~/.drive-google/logs/drive-google.log has not yet been opened
if [[ -z $fd ]]; then
lowest_unused_fd ()
{
local fd=0
while [ -e /proc/$$/fd/${fd} ]; do
fd=$((fd+1))
done
echo $fd
}
fd=$(lowest_unused_fd)
# Opening ~/.drive-google/logs/drive-google.log as file descriptor $fd for appending
eval "exec $fd>> ~/.drive-google/logs/drive-google.log"
fi
# Writing the trace output generated when set -x is enabled to file descriptor $fd
eval "BASH_XTRACEFD=$fd"
# Logging line numbers - We could also use ${0} for ${BASH_SOURCE}
BASH_SOURCE_BASENAME=$(basename ${BASH_SOURCE})
export PS4='${BASH_SOURCE_BASENAME}.${LINENO}+ '
# Expanding all variables and prints the full commands before output of the command
set -x
fi
date_time="$1"
# Checking for no parameter or parameter beginning with '-'
if [[ ($# -eq 0) || ($year =~ ^-) ]]; then
end_of_help_message_line_number=$(awk '/^if \[\[ \$LOG_/{ print NR; exit }' /usr/bin/convert-date-time-to-utc)
((end_of_help_message_line_number--))
awk -v var=$end_of_help_message_line_number 'NR >= 19 && NR <= var' /usr/bin/convert-date-time-to-utc | zenity --text-info --title "convert-date-time-to-utc help" --width 1150 --height 850
exit 1
else
date=$(echo $date_time | cut -d ' ' -f 1)
date_day=$(echo $date | cut -d '-' -f 3)
date_month=$(echo $date | cut -d '-' -f 2)
date_year=$(echo $date | cut -d '-' -f 1)
time=$(echo $date_time | cut -d ' ' -f 2)
time_hours=$(echo $time | cut -d ':' -f 1)
time_mns=$(echo $time | cut -d ':' -f 2)
time_secs=$(echo $time | cut -d ':' -f 3)
# Removing hypothetical leading 0 from most variables,
# otherwise subsequent [[ ]] would consider numbers beginning with a zero as octal
# [ ] does not, but [[ ]] offers more compatibility
date_day=${date_day#0}
date_month=${date_month#0}
time_hours=${time_hours#0}
time_mns=${time_mns#0}
time_secs=${time_secs#0}
# Initializing $last_day_current_month depending on $date_month
case $date_month in
# Months with 31 days
1|8)
last_day_current_month=31
last_day_previous_month=31
;;
# Months with 31 days
3|5|7|10|12)
last_day_current_month=31
last_day_previous_month=30
;;
# Months with 30 days
4|6|9|11)
last_day_current_month=30
last_day_previous_month=31
;;
# February
2)
# Is this a leap year?
if $(leap-year $date_year); then
last_day_current_month=29
else
last_day_current_month=28
fi
last_day_previous_month=31
;;
*)
zenity --error --title "Fatal error in convert-date_time-to-utc" --text="\tUnknown date format: $date_time\n${noamp_local_folder}/${noamp_object}\nPlease report that issue to: https://gitlab.com/jean-christophe-manciot/Drive/issues:\n\tdate_month: $date_month does not exist" --width 1200
exit 1
;;
esac
# Rounding up/down $time_secs if there are nanoseconds
if [[ $time_secs =~ '.' ]]; then
if [[ $(echo $time_secs | cut -d '.' -f 2 | cut -c1-1) -ge 5 ]]; then
# Removing all nanoseconds
time_secs=$(echo $time_secs | cut -d '.' -f 1)
# Rounding up the seconds
((time_secs++))
if [[ $time_secs -eq 60 ]]; then
time_secs=0
((time_mns++))
if [[ $time_mns -eq 60 ]]; then
time_mns=0
((time_hours++))
if [[ $time_hours -eq 24 ]]; then
time_hours=0
((date_day++))
if [[ $date_day -gt $last_day_current_month ]]; then
date_day=1
((date_month++))
if [[ $date_month -gt 12 ]]; then
date_month=1
((date_year++))
fi
fi
fi
fi
fi
else
# Rounding down the seconds
# Removing all nanoseconds
time_secs=$(echo $time_secs | cut -d '.' -f 1)
fi
fi
# Levelling to UTC: date_time can be below (-), equal (+0000) or above (+) UTC
if [[ $(echo $date_time | cut -d ' ' -f 3) =~ - ]]; then
below_utc_offset=$(echo $date_time | cut -d ' ' -f 3 | cut -d '-' -f 2)
below_utc_offset_hours=${below_utc_offset:0:2}
below_utc_offset_mns=${below_utc_offset:2:2}
utc_time_hours=`expr $time_hours + $below_utc_offset_hours`
utc_time_mns=`expr $time_mns + $below_utc_offset_mns`
elif [[ "$ldate_time" =~ \+0000 ]]; then
# The job is already done
utc_date_year=$date_year
utc_date_month=$date_month
utc_date_day=$date_day
utc_time_hours=$time_hours
utc_time_mns=$time_mns
elif [[ $(echo $date_time | cut -d ' ' -f 3) =~ \+ ]]; then
above_utc_offset=$(echo $date_time | cut -d ' ' -f 3 | cut -d '+' -f 2)
above_utc_offset_hours=${above_utc_offset:0:2}
above_utc_offset_mns=${above_utc_offset:2:2}
utc_time_hours=`expr $time_hours - $above_utc_offset_hours`
utc_time_mns=`expr $time_mns - $above_utc_offset_mns`
else
zenity --error --title "Fatal error in convert-date_time-to-utc" --text="\tUnknown date format: $date_time\n${noamp_local_folder}/${noamp_object}\nPlease report that issue to: https://gitlab.com/jean-christophe-manciot/Drive/issues:\n\tdate_time neither + nor -" --width 1200
exit 1
fi
# More job to do if $date_time is not originally UTC
if [[ ! "$ldate_time" =~ \+0000 ]]; then
# If the adjusted time goes beyond 24
if [[ $utc_time_hours -ge 24 ]]; then
utc_time_hours=`expr $utc_time_hours - 24`
utc_date_day=`expr $date_day + 1`
# If the adjusted time goes below 0
elif [[ "$utc_time_hours" =~ - ]]; then
utc_time_hours=`expr $utc_time_hours + 24`
utc_date_day=`expr $date_day - 1`
else
# time_hours & date_day remain untouched
utc_date_day=$date_day
fi
# If the adjusted day goes beyond $last_day_current_month
if [[ $utc_date_day -gt $last_day_current_month ]]; then
utc_date_day=`expr $utc_date_day - $last_day_current_month`
utc_date_month=`expr $date_month + 1`
# If the adjusted day goes below 1
elif [[ $utc_date_day -eq 0 ]]; then
utc_date_day=$last_day_previous_month
utc_date_month=`expr $date_month - 1`
else
# date_day & date_month remain untouched
utc_date_month=$date_month
fi
# If the adjusted month goes beyond 12
if [[ $utc_date_month -gt 12 ]]; then
utc_date_month=`expr $utc_date_month - 12`
utc_date_year=`expr $date_year + 1`
# If the adjusted month goes below 1
elif [[ $utc_date_month -eq 0 ]]; then
utc_date_month=12
utc_date_year=`expr $date_year - 1`
else
# date_month & date_year remain untouched
utc_date_year=$date_year
fi
if [[ "$utc_date_year" =~ - ]]; then
zenity --error --title "Fatal error in convert-date_time-to-utc" --text="\tUnknown date format: $date_time\n${noamp_local_folder}/${noamp_object}\nPlease report that issue to: https://gitlab.com/jean-christophe-manciot/Drive/issues:\n\tutc_date_year: $utc_date_year contains -" --width 1200
exit 1
fi
fi
# Building whole UTC-adjusted date time
utc_date="${utc_date_year}-${utc_date_month}-${utc_date_day}"
utc_time="${utc_time_hours}:${utc_time_mns}:${time_secs}"
utc_date_time="${utc_date} ${utc_time}"
# Returning the converted date_time in UTC
echo "$utc_date_time"
fi
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