exec/bkplog.sh

   1 #!/bin/bash
   2
   3 # Date: 2020-04-10T04:32Z
   4
   5 # Author: Steven Baltakatei Sandoval
   6
   7 # License:
   8
   9 # Description: Logs pressure to a daily log file. Restarts daily at
  10 # UTC midnight.
  11
  12 # Usage: plog.sh [ sensor script path ] [ output log dir path ]
  13
  14 echoerr() { echo "$@" 1>&2 ; } # Define echo to stderr function.
  15
  16 SENSOR_SCRIPT_PATH="$1" # Identify first argument as sensor script path.
  17 DIROUT1="$2" # Identify second argument as output log file directory path.
  18
  19 SCRIPT_PATH="${0}" # [1]
  20 SCRIPT_BASENAME="$(basename "$SCRIPT_PATH")"
  21 SCRIPT_DIR="$(dirname "$SCRIPT_PATH")"
  22 SCRIPT_TIME_SHORT="$(date +%Y%m%dT%H%M%S%z)"
  23 SCRIPT_DATE_SHORT="$(date +%Y%m%d)"
  24
  25 SCRIPT_ERROR_LOG_PATH=~/"$SCRIPT_DATE_SHORT""_""$SCRIPT_BASENAME"..error.log
  26
  27 # Check that time synchronization service ('ntp') exists. Warn if it doesn't.
  28 if command -v ntp 1>/dev/null 2>&1; then echoerr "WARNING: ntp not found. Log timestamps may not be accurate."; fi
  29
  30 # Main loop
  31 if [ -d "$DIROUT1" ] && [ -f "$SENSOR_SCRIPT_PATH" ] ; then # Check that output directory and sensor script file exist.
  32     while true; do
  33         echoerr "DEBUG:Starting while loop."
  34
  35         # Update time constants
  36         TIME_CURRENT="$(date --iso-8601=seconds)" ;
  37         #echoerr "DEBUG:TIME_CURRENT is:""$TIME_CURRENT" ;
  38         TIME_CURRENT_SHORT="$(date -d "$TIME_CURRENT" +%Y%m%dT%H%M%S%z)"
  39         #echoerr "DEBUG:TIME_CURRENT_SHORT is""$TIME_CURRENT_SHORT"
  40         DATE_CURRENT="$(date -d "$TIME_CURRENT" --iso-8601=date)" ;
  41         #echoerr "DEBUG:DATE_CURRENT is:""$DATE_CURRENT" ;
  42         DATE_CURRENT_SHORT="$(date -d "$TIME_CURRENT" +%Y%m%d)" ;
  43         #echoerr "DEBUG:DATE_CURRENT is:""$DATE_CURRENT_SHORT" ;
  44         DATE_TOMORROW="$(date -d "$TIME_CURRENT next day" --iso-8601=date)" ;
  45         #echoerr "DEBUG:DATE_TOMORROW is:""$DATE_TOMORROW" ;
  46         TIME_NEXT_MIDNIGHT="$(date -d "$DATE_TOMORROW" --iso-8601=seconds)" ;
  47         #echoerr "DEBUG:TIME_NEXT_MIDNIGHT is:""$TIME_NEXT_MIDNIGHT" ;
  48         ####SECONDS_UNTIL_NEXT_MIDNIGHT="$((  $(date +%s -d "$TIME_NEXT_MIDNIGHT") - $(date +%s -d "$TIME_CURRENT")  ))" ;
  49         SECONDS_UNTIL_NEXT_MIDNIGHT="10" # DEBUG 10 second. Hail Satan.
  50         #echoerr "DEBUG:SECONDS_UNTIL_NEXT_MIDNIGHT is:""$SECONDS_UNTIL_NEXT_MIDNIGHT" ;
  51         if [ "$SECONDS_UNTIL_NEXT_MIDNIGHT" -eq 0 ]; then echoerr "WARNING:Is it exactly midnight?" ; continue; fi ; # Exit loop early if equal to 0 because "timeout 0s" never ends.
  52         if [ "$SECONDS_UNTIL_NEXT_MIDNIGHT" -lt 0 ]; then echoerr "ERROR:Time until midnight error." ; exit 1; fi ; # Exit script if equal to 0 because "timeout 0s" never ends.
  53
  54         # Update output file names.
  55         DIROUTN="$DIROUT1" ;
  56         FILEOUTN="$DATE_CURRENT_SHORT""..""$(hostname)""_pressure.csv" ;
  57
  58         # DEBUG
  59         echoerr "SECONDS_UNTIL_NEXT_MIDNIGHT:""$SECONDS_UNTIL_NEXT_MIDNIGHT"
  60         echoerr "SENSOR_SCRIPT_PATH         :""$SENSOR_SCRIPT_PATH"
  61         echoerr "DIROUTN                    :""$DIROUTN"
  62         echoerr "FILEOUTN                   :""$FILEOUTN"
  63
  64         # Append pressure log until midnight.
  65         timeout "$SECONDS_UNTIL_NEXT_MIDNIGHT""s" python2 "$SENSOR_SCRIPT_PATH" 1>> "$DIROUTN"/"$FILEOUTN" 2>&1 ; # log script data
  66     done
  67
  68 else
  69     echoerr "$SCRIPT_TIME_SHORT"">Sensor script file not found at: $SENSOR_SCRIPT_PATH or $DIROUT1 not found."
  70     echo "$SCRIPT_TIME_SHORT"">Sensor script file not found at: $SENSOR_SCRIPT_PATH or $DIROUT1 not found." >> "$SCRIPT_ERROR_LOG_PATH" ;
  71 fi
  72
  73 # == References ==
  74 # 1. How to indicate script file name in a bash script. https://stackoverflow.com/a/3588939