exec/bkgpslog

   1 #!/bin/bash
   2
   3 # Desc: Records gps data until midnight
   4 # Author: Steven Baltakatei Sandoval; License: GPLv3+
   5 # Usage: bkgpslog -o [output dir]
   6
   7 #==BEGIN Define script parameters==
   8 ## Logging Behavior parameters
   9 BUFFER_TTL="60"; # time between file writes
  10 SCRIPT_TTL="day"; # (day|hour)
  11 #### TZ="UTC"; export TZ; # Default time zone; overridden by '--time-zone=[str]' option
  12 DIR_TMP_DEFAULT="/dev/shm"; # Default parent of working directory
  13
  14 SCRIPT_TIME_START=$(date +%Y%m%dT%H%M%S.%N);
  15 PATH="$HOME/.local/bin:$PATH";   # Add "$(systemd-path user-binaries)" path in case apps saved there
  16 SCRIPT_HOSTNAME=$(hostname);     # Save hostname of system running this script.
  17 SCRIPT_VERSION="bkgpslog 0.1.0"; # Define version of script.
  18
  19 declare -Ag appRollCall # Associative array for storing app status
  20 declare -Ag fileRollCall # Associative array for storing file status
  21 declare -Ag dirRollCall # Associative array for storing dir status
  22 declare -a recPubKeys # for processArguments function
  23 declare recipients # for main function
  24
  25 ## Initialize variables
  26 OPTION_VERBOSE=""; OPTION_ENCRYPT=""; OPTION_COMPRESS=""; OPTION_TMPDIR="";
  27
  28 #===BEGIN Declare local script functions===
  29 checkapp() {
  30     # Desc: If arg is a command, save result in assoc array 'appRollCall'
  31     # Usage: checkapp arg1 arg2 arg3 ...
  32     # Input: global assoc. array 'appRollCall'
  33     # Output: adds/updates key(value) to global assoc array 'appRollCall'
  34     local returnState
  35     #echo "DEBUG:$(date +%S.%N)..Starting checkapp function."
  36     #echo "DEBUG:args: $@"
  37     #echo "DEBUG:returnState:$returnState"
  38
  39     #===Process Args===
  40     for arg in "$@"; do
  41         #echo "DEBUG:processing arg:$arg"
  42         if command -v "$arg" 1>/dev/null 2>&1; then # Check if arg is a valid command
  43             appRollCall[$arg]="true";
  44             #echo "DEBUG:appRollCall[$arg]:"${appRollCall[$arg]}
  45             if ! [ "$returnState" = "false" ]; then returnState="true"; fi
  46         else
  47             appRollCall[$arg]="false"; returnState="false";
  48         fi
  49     done
  50
  51     #for key in "${!appRollCall[@]}"; do echo "DEBUG:$key => ${appRollCall[$key]}"; done
  52     #echo "DEBUG:evaluating returnstate. returnState:"$returnState
  53
  54     #===Determine function return code===
  55     if [ "$returnState" = "true" ]; then
  56         #echo "DEBUG:checkapp returns true for $arg";
  57         return 0;
  58     else
  59         #echo "DEBUG:checkapp returns false for $arg";
  60         return 1;
  61     fi
  62 } # Check that app exists
  63 checkfile() {
  64     # Desc: If arg is a file path, save result in assoc array 'fileRollCall'
  65     # Usage: checkfile arg1 arg2 arg3 ...
  66     # Input: global assoc. array 'fileRollCall'
  67     # Output: adds/updates key(value) to global assoc array 'fileRollCall';
  68     # Output: returns 0 if app found, 1 otherwise
  69     local returnState
  70
  71     #===Process Args===
  72     for arg in "$@"; do
  73         #echo "DEBUG:processing arg:$arg"
  74         if [ -f "$arg" ]; then
  75             fileRollCall["$arg"]="true";
  76             #echo "DEBUG:fileRollCall[\"$arg\"]:"${fileRollCall["$arg"]}
  77             if ! [ "$returnState" = "false" ]; then returnState="true"; fi
  78         else
  79             fileRollCall["$arg"]="false"; returnState="false";
  80         fi
  81     done
  82
  83     #for key in "${!fileRollCall[@]}"; do echo "DEBUG:fileRollCall key [$key] is:${fileRollCall[$key]}"; done
  84     #echo "DEBUG:evaluating returnstate. returnState:"$returnState
  85
  86     #===Determine function return code===
  87     if [ "$returnState" = "true" ]; then
  88         #echo "DEBUG:checkapp returns true for $arg";
  89         return 0;
  90     else
  91         #echo "DEBUG:checkapp returns false for $arg";
  92         return 1;
  93     fi
  94 } # Check that file exists
  95 checkdir() {
  96     # Desc: If arg is a dir path, save result in assoc array 'dirRollCall'
  97     # Usage: checkdir arg1 arg2 arg3 ...
  98     # Input: global assoc. array 'dirRollCall'
  99     # Output: adds/updates key(value) to global assoc array 'dirRollCall';
 100     # Output: returns 0 if app found, 1 otherwise
 101     local returnState
 102
 103     #===Process Args===
 104     for arg in "$@"; do
 105         #echo "DEBUG:processing arg:$arg"
 106         if [ -d "$arg" ]; then
 107             dirRollCall["$arg"]="true";
 108             #echo "DEBUG:dirRollCall[\"$arg\"]:"${dirRollCall["$arg"]}
 109             if ! [ "$returnState" = "false" ]; then returnState="true"; fi
 110         elif [ "$arg" = "" ]; then
 111             dirRollCall["$arg"]="false"; returnState="false";
 112         else
 113             returnState="false";
 114         fi
 115     done
 116
 117     #for key in "${!dirRollCall[@]}"; do echo "DEBUG:dirRollCall key [$key] is:${dirRollCall[$key]}"; done
 118     #echo "DEBUG:evaluating returnstate. returnState:"$returnState
 119
 120     #===Determine function return code===
 121     if [ "$returnState" = "true" ]; then
 122         #echo "DEBUG:checkapp returns true for $arg";
 123         return 0;
 124     else
 125         #echo "DEBUG:checkapp returns false for $arg";
 126         return 1;
 127     fi
 128 } # Check that dir exists
 129
 130 # Yell, Die, Try Three-Fingered Claw technique
 131 # Ref/Attrib: https://stackoverflow.com/a/25515370
 132 yell() { echo "$0: $*" >&2; }
 133 die() { yell "$*"; exit 111; }
 134 try() { "$@" || die "cannot $*"; }
 135
 136 echoerr() {
 137     echo "$@" 1>&2; # Define stderr echo function.
 138 } # Define stderr message function.
 139 showUsage() {
 140     echoerr "USAGE:"
 141     echoerr "    bkgpslog [ options ]"
 142     echoerr
 143     echoerr "OPTIONS:"
 144     echoerr "    -h, --help"
 145     echoerr "            Display help information."
 146     echoerr
 147     echoerr "    --version"
 148     echoerr "            Display script version."
 149     echoerr
 150     echoerr "    -v, --verbose"
 151     echoerr "            Display debugging info."
 152     echoerr
 153     echoerr "    -e, --encrypt"
 154     echoerr "            Encrypt output."
 155     echoerr
 156     echoerr "    -r, --recipient [ pubkey string ]"
 157     echoerr "            Specify recipient. May be age or ssh pubkey."
 158     echoerr "            See https://github.com/FiloSottile/age"
 159     echoerr
 160     echoerr "    -o, --output [ directory ]"
 161     echoerr "            Specify output directory to save logs."
 162     echoerr
 163     echoerr "    -c, --compress"
 164     echoerr "            Compress output with gzip (before encryption if enabled)."
 165     echoerr
 166     echoerr "    -z, --time-zone"
 167     echoerr "            Specify time zone. (ex: \"America/New_York\")"
 168     echoerr
 169     echoerr "    -t, --temp-dir"
 170     echoerr "            Specify parent directory for temporary working directory."
 171     echoerr "            Default: \"/dev/shm\""
 172     echoerr
 173     echoerr "EXAMPLE: (bash script lines)"
 174     echoerr "/bin/bash bkgpslog -e -c \\"
 175     echoerr "-r age1mrmfnwhtlprn4jquex0ukmwcm7y2nxlphuzgsgv8ew2k9mewy3rs8u7su5 \\"
 176     echoerr "-r age1ala848kqrvxc88rzaauc6vc5v0fqrvef9dxyk79m0vjea3hagclswu0lgq \\"
 177     echoerr "-o ~/Sync/Location"
 178 } # Display information on how to use this script.
 179 showVersion() {
 180     echoerr "$SCRIPT_VERSION"
 181 } # Display script version.
 182 vbm() {
 183     # Usage: vbm "DEBUG:verbose message here"
 184     # Description: Prints verbose message ("vbm") to stderr if OPTION_VERBOSE is set to "true".
 185     # Input:
 186     #   - OPTION_VERBOSE  variable set by processArguments function. (ex: "true", "false")
 187     #   - "$@"            positional arguments fed to this function.
 188     # Output: stderr
 189     # Script function dependencies: echoerr
 190     # External function dependencies: echo
 191     # Last modified: 2020-04-11T23:57Z
 192     # Last modified by: Steven Baltakatei Sandoval
 193     # License: GPLv3+
 194     # Ref./Attrib:
 195
 196     if [ "$OPTION_VERBOSE" = "true" ]; then
 197         FUNCTION_TIME=$(date --iso-8601=ns); # Save current time in nano seconds.
 198         echoerr "[$FUNCTION_TIME] ""$*"; # Display argument text.
 199     fi
 200
 201     # End function
 202     return 0; # Function finished.
 203 } # Verbose message display function.
 204 processArguments() {
 205     while [ ! $# -eq 0 ]; do   # While number of arguments ($#) is not (!) equal to (-eq) zero (0).
 206         #echoerr "DEBUG:Starting processArguments while loop."
 207         #echoerr "DEBUG:Provided arguments are:""$*"
 208         case "$1" in
 209             -h | --help) showUsage; exit 1;; # Display usage.
 210             --version) showVersion; exit 1;; # Show version
 211             -v | --verbose) OPTION_VERBOSE="true"; vbm "DEBUG:Verbose mode enabled.";; # Enable verbose mode.
 212             -o | --output) if [ -d "$2" ]; then DIR_OUT="$2"; vbm "DEBUG:DIR_OUT:$DIR_OUT"; shift; fi ;; # Define output directory.
 213             -e | --encrypt) OPTION_ENCRYPT="true"; vbm "DEBUG:Encrypted output mode enabled.";;
 214             -r | --recipient) # Add 'age' recipient via public key string
 215                 recPubKeys+=("$2"); vbm "STATUS:pubkey added:""$2"; shift;;
 216             -c | --compress) OPTION_COMPRESS="true"; vbm "DEBUG:Compressed output mode enabled.";;
 217             -z | --time-zone) try setTimeZoneEV "$2"; shift;;
 218             -t | --temp-dir) OPTION_TMPDIR="true" && TMP_DIR_PRIORITY="$2"; shift;;
 219             *) echoerr "ERROR: Unrecognized argument: $1"; echoerr "STATUS:All arguments:$*"; exit 1;; # Handle unrecognized options.
 220         esac
 221         shift
 222     done
 223 } # Argument Processing
 224 setTimeZoneEV(){
 225     # Desc: Set time zone environment variable TZ
 226     # Usage: setTimeZoneEV arg1
 227     # Input: arg1: 'date'-compatible timezone string (ex: "America/New_York")
 228     #        TZDIR env var (optional; default: "/usr/share/zoneinfo")
 229     # Output: exports TZ
 230     #         exit code 0 on success
 231     #         exit code 1 on incorrect number of arguments
 232     #         exit code 2 if unable to validate arg1
 233     # Depends: yell, printenv, bash 5
 234     # Tested on: Debian 10
 235     ARG1="$1"
 236     local tzDir returnState
 237     if ! [[ $# -eq 1 ]]; then
 238         yell "ERROR:Invalid argument count.";
 239         return 1;
 240     fi
 241
 242     # Read TZDIR env var if available
 243     if printenv TZDIR 1>/dev/null 2>&1; then
 244         tzDir="$(printenv TZDIR)";
 245     else
 246         tzDir="/usr/share/zoneinfo";
 247     fi
 248
 249     # Validate TZ string
 250     if ! [[ -f "$tzDir"/"$ARG1" ]]; then
 251         yell "ERROR:Invalid time zone argument.";
 252         return 2;
 253     else
 254     # Export ARG1 as TZ environment variable
 255         TZ="$ARG1" && export TZ && returnState="true";
 256     fi
 257
 258     # Determine function return code
 259     if [ "$returnState" = "true" ]; then
 260         return 0;
 261     fi
 262 } # Exports TZ environment variable
 263 timeUntilNextDay(){
 264     # Desc: Report seconds until next day.
 265     # Output: stdout: integer seconds until next day
 266     # Output: exit code 0 if stdout > 0; 1 if stdout = 0; 2 if stdout < 0
 267     # Usage: timeUntilNextDay
 268     # Usage: if ! myTTL="$(timeUntilNextDay)"; then yell "ERROR in if statement"; exit 1; fi
 269     local returnState TIME_CURRENT TIME_NEXT_DAY SECONDS_UNTIL_NEXT_DAY
 270     TIME_CURRENT="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
 271     TIME_NEXT_DAY="$(date -d "$TIME_CURRENT next day" --iso-8601=date)"; # Produce timestamp of beginning of tomorrow with resolution of 1 second.
 272     SECONDS_UNTIL_NEXT_DAY="$(( $(date +%s -d "$TIME_NEXT_DAY") - $(date +%s -d "$TIME_CURRENT") ))" ; # Calculate seconds until closest future midnight (res. 1 second).
 273     if [[ "$SECONDS_UNTIL_NEXT_DAY" -gt 0 ]]; then
 274         returnState="true";
 275     elif [[ "$SECONDS_UNTIL_NEXT_DAY" -eq 0 ]]; then
 276         returnState="WARNING_ZERO";
 277         yell "WARNING:Reported time until next day exactly zero.";
 278     elif [[ "$SECONDS_UNTIL_NEXT_DAY" -lt 0 ]]; then
 279         returnState="WARNING_NEGATIVE";
 280         yell "WARNING:Reported time until next day is negative.";
 281     fi
 282
 283     try echo "$SECONDS_UNTIL_NEXT_DAY"; # Report
 284
 285     #===Determine function return code===
 286     if [[ "$returnState" = "true" ]]; then
 287         return 0;
 288     elif [[ "$returnState" = "WARNING_ZERO" ]]; then
 289         return 1;
 290     elif [[ "$returnState" = "WARNING_NEGATIVE" ]]; then
 291         return 2;
 292     fi
 293 } # Report seconds until next day
 294 timeUntilNextHour(){
 295     # Desc: Report seconds until next hour
 296     # Output: stdout: integer seconds until next hour
 297     # Output: exit code 0 if stdout > 0; 1 if stdout = 0; 2 if stdout < 0
 298     # Usage: timeUntilNextHour
 299     # Usage: if ! myTTL="$(timeUntilNextHour)"; then yell "ERROR in if statement"; exit 1; fi
 300     local returnState TIME_CURRENT TIME_NEXT_HOUR SECONDS_UNTIL_NEXT_HOUR
 301     TIME_CURRENT="$(date --iso-8601=seconds)"; # Produce `date`-parsable current timestamp with resolution of 1 second.
 302     TIME_NEXT_HOUR="$(date -d "$TIME_CURRENT next hour" --iso-8601=hours)"; # Produce `date`-parsable current time stamp with resolution of 1 second.
 303     SECONDS_UNTIL_NEXT_HOUR="$(( $(date +%s -d "$TIME_NEXT_HOUR") - $(date +%s -d "$TIME_CURRENT") ))"; # Calculate seconds until next hour (res. 1 second).
 304     if [[ "$SECONDS_UNTIL_NEXT_HOUR" -gt 0 ]]; then
 305         returnState="true";
 306     elif [[ "$SECONDS_UNTIL_NEXT_HOUR" -eq 0 ]]; then
 307         returnState="WARNING_ZERO";
 308         yell "WARNING:Reported time until next hour exactly zero.";
 309     elif [[ "$SECONDS_UNTIL_NEXT_HOUR" -lt 0 ]]; then
 310         returnState="WARNING_NEGATIVE";
 311         yell "WARNING:Reported time until next hour is negative.";
 312     fi
 313
 314     try echo "$SECONDS_UNTIL_NEXT_HOUR"; # Report
 315
 316     #===Determine function return code===
 317     if [[ "$returnState" = "true" ]]; then
 318         return 0;
 319     elif [[ "$returnState" = "WARNING_ZERO" ]]; then
 320         return 1;
 321     elif [[ "$returnState" = "WARNING_NEGATIVE" ]]; then
 322         return 2;
 323     fi
 324 } # Report seconds until next hour
 325 dateTimeShort(){
 326     # Desc: Timestamp without separators (YYYYmmddTHHMMSS+zzzz)
 327     # Usage: dateTimeShort
 328     # Output: stdout: timestamp (ISO-8601, no separators)
 329     local TIME_CURRENT TIME_CURRENT_SHORT
 330     TIME_CURRENT="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
 331     TIME_CURRENT_SHORT="$(date -d "$TIME_CURRENT" +%Y%m%dT%H%M%S%z)"; # Produce separator-less current timestamp with resolution 1 second.
 332     echo "$TIME_CURRENT_SHORT";
 333 } # Get YYYYmmddTHHMMSS±zzzz
 334 dateShort(){
 335     # Desc: Date without separators (YYYYmmdd)
 336     # Usage: dateShort
 337     # Output: stdout: date (ISO-8601, no separators)
 338     local TIME_CURRENT DATE_CURRENT_SHORT
 339     TIME_CURRENT="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
 340     DATE_CURRENT_SHORT="$(date -d "$TIME_CURRENT" +%Y%m%d)"; # Produce separator-less current date with resolution 1 day.
 341     echo "$DATE_CURRENT_SHORT";
 342 } # Get YYYYmmdd
 343 timeDuration(){
 344     # Desc: Output approximate time duration string before given time (default:current date)
 345     # Ref/Attrib: ISO-8601:2004(E), §4.4.4.2 Representations of time intervals by duration and context information
 346     # Note: "1 month" ("P1M") is assumed to be "30 days" (see ISO-8601:2004(E), §2.2.1.2)
 347     # Usage: timeDuration [arg1] ([arg2])
 348     # Input: arg1: seconds as base 10 integer >= 0  (ex: 3601)
 349     #        arg2: precision level (optional; default=2)
 350     # Output: stdout: ISO-8601 duration string (ex: "P1H1S", "P2Y10M15DT10H30M20S")
 351     # Example: 'timeDuration 111111 3' yields 'P1DT6H51M'
 352     # Depends: date 8 (gnucoreutils)
 353     local returnState fullHours fullMinutes fullSeconds;
 354     ARG1="$1";
 355     ARG2="$2";
 356     precision=2; # set default precision
 357     returnState="true"; # set default return state
 358
 359     # Check that between one and two arguments is supplied
 360     if ! { [[ $# -ge 1 ]] && [[ $# -le 2 ]]; }; then
 361         yell "ERROR:Invalid number of arguments:$# . Exiting.";
 362         returnState="ERROR_INPUT"; fi
 363
 364     # Check that arg1 provided
 365     if [[ $# -ge 1 ]]; then
 366         # Check that arg1 is a positive integer
 367         if [[ "$ARG1" =~ ^[[:digit:]]+$ ]]; then
 368             arg1Valid="true";
 369         else
 370             yell "ERROR:ARG1 not a digit.";
 371             returnState="ERROR_INPUT";
 372             arg1Valid="false";
 373         fi
 374     else
 375         yell "ERROR:No argument provided. Exiting.";
 376         exit 1;
 377     fi
 378
 379     # Consider whether arg2 was provided
 380     if  [[ $# -eq 2 ]]; then
 381         # Check that the second arg is a positive integer
 382         if [[ "$ARG2" =~ ^[[:digit:]]+$ ]] && [[ "ARG2" -gt 0 ]]; then
 383         arg2Valid="true";
 384         precision="$ARG2";
 385         else
 386             yell "ERROR:ARG2 not a positive integer. (is $ARG2 ). Leaving early.";
 387             returnState="ERROR_INPUT";
 388             arg2Valid="false";
 389         fi;
 390     else
 391         arg2Valid="false";
 392     fi;
 393
 394     remainder="$ARG1" ; # seconds
 395     ## Calculate full years Y, update remainder
 396     fullYears=$(( remainder / (365*24*60*60) ));
 397     remainder=$(( remainder - (fullYears*365*24*60*60) ));
 398     ## Calculate full months M, update remainder
 399     fullMonths=$(( remainder / (30*24*60*60) ));
 400     remainder=$(( remainder - (fullMonths*30*24*60*60) ));
 401     ## Calculate full days D, update remainder
 402     fullDays=$(( remainder / (24*60*60) ));
 403     remainder=$(( remainder - (fullDays*24*60*60) ));
 404     ## Calculate full hours H, update remainder
 405     fullHours=$(( remainder / (60*60) ));
 406     remainder=$(( remainder - (fullHours*60*60) ));
 407     ## Calculate full minutes M, update remainder
 408     fullMinutes=$(( remainder / (60) ));
 409     remainder=$(( remainder - (fullMinutes*60) ));
 410     ## Calculate full seconds S, update remainder
 411     fullSeconds=$(( remainder / (1) ));
 412     remainder=$(( remainder - (remainder*1) ));
 413     ## Check which fields filled
 414     if [[ $fullYears -gt 0 ]]; then hasYears="true"; else hasYears="false"; fi
 415     if [[ $fullMonths -gt 0 ]]; then hasMonths="true"; else hasMonths="false"; fi
 416     if [[ $fullDays -gt 0 ]]; then hasDays="true"; else hasDays="false"; fi
 417     if [[ $fullHours -gt 0 ]]; then hasHours="true"; else hasHours="false"; fi
 418     if [[ $fullMinutes -gt 0 ]]; then hasMinutes="true"; else hasMinutes="false"; fi
 419     if [[ $fullSeconds -gt 0 ]]; then hasSeconds="true"; else hasSeconds="false"; fi
 420
 421     ## Determine which fields to display (see ISO-8601:2004 §4.4.3.2)
 422     witherPrecision="false"
 423
 424     ### Years
 425     if $hasYears && [[ $precision -gt 0 ]]; then
 426         displayYears="true";
 427         witherPrecision="true";
 428     else
 429         displayYears="false";
 430     fi;
 431     if $witherPrecision; then ((precision--)); fi;
 432
 433     ### Months
 434     if $hasMonths && [[ $precision -gt 0 ]]; then
 435         displayMonths="true";
 436         witherPrecision="true";
 437     else
 438         displayMonths="false";
 439     fi;
 440     if $witherPrecision && [[ $precision -gt 0 ]]; then
 441         displayMonths="true";
 442     fi;
 443     if $witherPrecision; then ((precision--)); fi;
 444
 445     ### Days
 446     if $hasDays && [[ $precision -gt 0 ]]; then
 447         displayDays="true";
 448         witherPrecision="true";
 449     else
 450         displayDays="false";
 451     fi;
 452     if $witherPrecision && [[ $precision -gt 0 ]]; then
 453         displayDays="true";
 454     fi;
 455     if $witherPrecision; then ((precision--)); fi;
 456
 457     ### Hours
 458     if $hasHours && [[ $precision -gt 0 ]]; then
 459         displayHours="true";
 460         witherPrecision="true";
 461     else
 462         displayHours="false";
 463     fi;
 464     if $witherPrecision && [[ $precision -gt 0 ]]; then
 465         displayHours="true";
 466     fi;
 467     if $witherPrecision; then ((precision--)); fi;
 468
 469     ### Minutes
 470     if $hasMinutes && [[ $precision -gt 0 ]]; then
 471         displayMinutes="true";
 472         witherPrecision="true";
 473     else
 474         displayMinutes="false";
 475     fi;
 476     if $witherPrecision && [[ $precision -gt 0 ]]; then
 477         displayMinutes="true";
 478     fi;
 479     if $witherPrecision; then ((precision--)); fi;
 480
 481     ### Seconds
 482
 483     if $hasSeconds && [[ $precision -gt 0 ]]; then
 484         displaySeconds="true";
 485         witherPrecision="true";
 486     else
 487         displaySeconds="false";
 488     fi;
 489     if $witherPrecision && [[ $precision -gt 0 ]]; then
 490         displaySeconds="true";
 491     fi;
 492     if $witherPrecision; then ((precision--)); fi;
 493
 494
 495
 496     ## Determine whether or not the "T" separator is needed to separate date and time elements
 497     if ( $displayHours || $displayMinutes || $displaySeconds); then
 498         displayDateTime="true"; else displayDateTime="false"; fi
 499
 500     ## Construct duration output string
 501     OUTPUT="P"
 502     if $displayYears; then
 503         OUTPUT=$OUTPUT$fullYears"Y"; fi
 504     if $displayMonths; then
 505         OUTPUT=$OUTPUT$fullMonths"M"; fi
 506     if $displayDays; then
 507         OUTPUT=$OUTPUT$fullDays"D"; fi
 508     if $displayDateTime; then
 509         OUTPUT=$OUTPUT"T"; fi
 510     if $displayHours; then
 511         OUTPUT=$OUTPUT$fullHours"H"; fi
 512     if $displayMinutes; then
 513         OUTPUT=$OUTPUT$fullMinutes"M"; fi
 514     if $displaySeconds; then
 515         OUTPUT=$OUTPUT$fullSeconds"S"; fi
 516
 517     ## Output duration string to stdout
 518     if [[ "$returnState" = "true" ]]; then echo "$OUTPUT"; fi
 519
 520     #===Determine function return code===
 521     if [ "$returnState" = "true" ]; then
 522         return 0;
 523     else
 524         echo "$returnState" 1>&2;
 525         return 1;
 526     fi
 527
 528 } # Get duration (ex: PT10M4S )
 529 displayMissing() {
 530     # Desc: Displays missing apps, files, and dirs
 531     # Usage: displayMissing
 532     # Input: associative arrays: appRollCall, fileRollCall, dirRollCall
 533     # Output: stderr messages
 534     #==BEGIN Display errors==
 535     #===BEGIN Display Missing Apps===
 536     missingApps="Missing apps  :"
 537     #for key in "${!appRollCall[@]}"; do echo "DEBUG:$key => ${appRollCall[$key]}"; done
 538     for key in "${!appRollCall[@]}"; do
 539         value="${appRollCall[$key]}"
 540         if [ "$value" = "false" ]; then
 541             #echo "DEBUG:Missing apps: $key => $value";
 542             missingApps="$missingApps""$key "
 543             appMissing="true"
 544         fi
 545     done
 546     if [ "$appMissing" = "true" ]; then  # Only indicate if an app is missing.
 547         echo "$missingApps" 1>&2;
 548     fi
 549     #===END Display Missing Apps===
 550
 551     #===BEGIN Display Missing Files===
 552     missingFiles="Missing files:"
 553     #for key in "${!fileRollCall[@]}"; do echo "DEBUG:$key => ${fileRollCall[$key]}"; done
 554     for key in "${!fileRollCall[@]}"; do
 555         value="${fileRollCall[$key]}"
 556         if [ "$value" = "false" ]; then
 557             #echo "DEBUG:Missing files: $key => $value";
 558             missingFiles="$missingFiles""$key "
 559             fileMissing="true"
 560         fi
 561     done
 562     if [ "$fileMissing" = "true" ]; then  # Only indicate if an app is missing.
 563         echo "$missingFiles" 1>&2;
 564     fi
 565     #===END Display Missing Files===
 566
 567     #===BEGIN Display Missing Directories===
 568     missingDirs="Missing dirs:"
 569     #for key in "${!dirRollCall[@]}"; do echo "DEBUG:$key => ${dirRollCall[$key]}"; done
 570     for key in "${!dirRollCall[@]}"; do
 571         value="${dirRollCall[$key]}"
 572         if [ "$value" = "false" ]; then
 573             #echo "DEBUG:Missing dirs: $key => $value";
 574             missingDirs="$missingDirs""$key "
 575             dirMissing="true"
 576         fi
 577     done
 578     if [ "$dirMissing" = "true" ]; then  # Only indicate if an dir is missing.
 579         echo "$missingDirs" 1>&2;
 580     fi
 581     #===END Display Missing Directories===
 582
 583     #==END Display errors==
 584 } # Display missing apps, files, dirs
 585 setScriptTTL() {
 586     #Desc: Sets script TTL
 587     #Usage: setScriptTTL arg1
 588     #Input: arg1: "day" or "hour"
 589     #Output: scriptTTL
 590     #Depends: timeUntilNextHour or timeUntilNextDay
 591     local ARG1
 592     ARG1="$1"
 593     if [[ "$ARG1" = "day" ]]; then
 594             # Set script lifespan to end at start of next day
 595         if ! scriptTTL="$(timeUntilNextDay)"; then
 596             if [[ "$scriptTTL" -eq 0 ]]; then
 597             ((scriptTTL++)); # Add 1 because 0 would cause 'timeout' to never timeout.
 598             else
 599             yell "ERROR: timeUntilNextDay exit code $?"; exit 1;
 600             fi;
 601         fi;
 602     elif [[ "$ARG1" = "hour" ]]; then
 603         # Set script lifespan to end at start of next hour
 604         if ! scriptTTL="$(timeUntilNextHour)"; then
 605             if [[ "$scriptTTL" -eq 0 ]]; then
 606                 ((scriptTTL++)); # Add 1 because 0 would cause 'timeout' to never timeout.
 607             else
 608                 yell "ERROR: timeUntilNextHour exit code $?"; exit 1;
 609             fi;
 610         fi;
 611     else
 612         yell "ERROR:Invalid argument for setScriptTTL function."; exit 1;
 613     fi
 614 } # Seconds until next (day|hour).
 615 checkMakeTar() {
 616     # Desc: Checks that a valid tar archive exists, creates one otherwise
 617     # Usage: checkMakeTar [ path ]
 618     # Input: arg1: path of tar archive
 619     # Output: exit code 0 (even if tar had to be created)
 620     # Depends: try, tar, date
 621     local PATH_TAR="$1"
 622
 623     # Check if file is a valid tar archive
 624     if tar --list --file="$PATH_TAR" 1>/dev/null 2>&1; then
 625         ## T1: return success
 626         return 0;
 627     else
 628         ## F1: Check if file exists
 629         if [[ -f "$PATH_TAR" ]]; then
 630             ### T: Rename file
 631             try mv "$PATH_TAR" "$PATH_TAR""--broken--""$(date +%Y%m%dT%H%M%S)";
 632         else
 633             ### F: -
 634             :
 635         fi
 636         ## F2: Create tar archive, return 0
 637         try tar --create --file="$PATH_TAR" --files-from=/dev/null;
 638         return 0;
 639     fi
 640 } # checks if arg1 is tar; creates one otherwise
 641 appendArgTar(){
 642     # Desc: Writes first argument to temporary file with arguments as options, then appends file to tar
 643     # Usage: writeArg "$(echo "Data to be written.")" [name of file to be inserted] [tar path] [temp dir] ([cmd1] [cmd2] [cmd3] [cmd4]...)
 644     # Input: arg1: data to be written
 645     #        arg2: file name of file to be inserted into tar
 646     #        arg3: tar archive path (must exist first)
 647     #        arg4: temporary working dir
 648     #        arg5+: command strings (ex: "gpsbabel -i nmea -f - -o kml -F - ")
 649     # Output: file written to disk
 650     # Example: decrypt multiple large files in parallel
 651     #          appendArgTar "$(cat /tmp/largefile1.gpg)" "largefile1" $HOME/archive.tar /tmp "gpg --decrypt" &
 652     #          appendArgTar "$(cat /tmp/largefile2.gpg)" "largefile2" $HOME/archive.tar /tmp "gpg --decrypt" &
 653     #          appendArgTar "$(cat /tmp/largefile3.gpg)" "largefile3" $HOME/archive.tar /tmp "gpg --decrypt" &
 654     # Depends: bash 5
 655
 656     # Save function name
 657     local FN="${FUNCNAME[0]}"
 658     yell "DEBUG:STATUS:$FN:Finished appendArgTar()."
 659
 660     # Set file name
 661     if ! [ -z "$2" ]; then FILENAME="$2"; else yell "ERROR:$FN:Not enough arguments."; exit 1; fi
 662
 663     # Check tar path is a file
 664     if [ -f "$3" ]; then TAR_PATH="$3"; else yell "ERROR:$FN:Tar archive arg not a file."; exit 1; fi
 665
 666     # Check temp dir arg
 667     if ! [ -z "$4" ]; then TMP_DIR="$4"; else yell "ERROR:$FN:No temporary working dir set."; exit 1; fi
 668
 669     # Set command strings
 670     if ! [ -z "$5" ]; then CMD1="$5"; else CMD1="tee /dev/null "; fi # command string 1
 671     if ! [ -z "$6" ]; then CMD2="$6"; else CMD2="tee /dev/null "; fi # command string 2
 672     if ! [ -z "$7" ]; then CMD3="$7"; else CMD3="tee /dev/null "; fi # command string 3
 673     if ! [ -z "$8" ]; then CMD4="$8"; else CMD4="tee /dev/null "; fi # command string 4
 674
 675     # Debug
 676     yell "STATUS:$FN:CMD1:$CMD1"
 677     yell "STATUS:$FN:CMD2:$CMD2"
 678     yell "STATUS:$FN:CMD3:$CMD3"
 679     yell "STATUS:$FN:CMD4:$CMD4"
 680     yell "STATUS:$FN:FILENAME:$FILENAME"
 681     yell "STATUS:$FN:TAR_PATH:$TAR_PATH"
 682     yell "STATUS:$FN:TMP_DIR:$TMP_DIR"
 683     # Write to temporary working dir
 684     echo "$1" | $CMD1 | $CMD2 | $CMD3 | $CMD4 > "$TMP_DIR"/"$FILENAME";
 685
 686     # Append to tar
 687     try tar --append --directory="$TMP_DIR" --file="$TAR_PATH" "$FILENAME";
 688     yell "DEBUG:STATUS:$FN:Finished appendArgTar()."
 689 } # Append Bash var to file appended to Tar archive
 690 magicWriteBuffer() {
 691     # Desc: bkgpslog-specific meta function for writing data to DIR_TMP then appending each file to PATHOUT_TAR
 692     # Inputs: PATHOUT_TAR FILEOUT_{NMEA,GPX,KML} CMD_CONV_{NMEA,GPX,KML} CMD_{COMPRESS,ENCRYPT} DIR_TMP
 693     # Depends: yell, try, vbm, appendArgTar, tar
 694     local FN="${FUNCNAME[0]}";
 695     wait; # Wait to avoid collision with older magicWriteBuffer() instances (see https://www.tldp.org/LDP/abs/html/x9644.html )
 696     vbm "DEBUG:STATUS:$FN:Started magicWriteBuffer().";
 697
 698     # Check that PATHOUT_TAR is a tar. Rename old and create empty one otherwise.
 699     checkMakeTar "$PATHOUT_TAR"
 700
 701     # Write bufferBash to PATHOUT_TAR
 702     appendArgTar "$bufferBash" "$FILEOUT_NMEA" "$PATHOUT_TAR" "$DIR_TMP" "$CMD_CONV_NMEA" "$CMD_COMPRESS" "$CMD_ENCRYPT"; # Write NMEA data
 703     appendArgTar "$bufferBash" "$FILEOUT_GPX" "$PATHOUT_TAR" "$DIR_TMP" "$CMD_CONV_GPX" "$CMD_COMPRESS" "$CMD_ENCRYPT"; # Write GPX file
 704     appendArgTar "$bufferBash" "$FILEOUT_KML" "$PATHOUT_TAR" "$DIR_TMP" "$CMD_CONV_KML" "$CMD_COMPRESS" "$CMD_ENCRYPT"; # Write KML file
 705     # Remove secured chunks from DIR_TMP
 706     try rm "$PATHOUT_NMEA" "$PATHOUT_GPX" "$PATHOUT_KML";
 707     yell "DEBUG:STATUS:$FN:Finished magicWriteBuffer().";
 708 } # bkgpslog write function
 709
 710
 711 main() {
 712     processArguments "$@" # Process arguments.
 713
 714     # Determine working directory
 715     ## Set DIR_TMP_PARENT to user-specified value if specified
 716     if [[ "$OPTION_TMPDIR" = "true" ]]; then
 717             if [[ -d "$TMP_DIR_PRIORITY" ]]; then
 718             DIR_TMP_PARENT="$OPTION_TMPDIR";
 719         else
 720             yell "WARNING:Specified temporary working directory not valid:$OPTION_TMPDIR";
 721             exit 1;
 722         fi
 723     fi
 724
 725     ## Set DIR_TMP_PARENT to default or fallback otherwise
 726     if [[ -d "$DIR_TMP_DEFAULT" ]]; then
 727         DIR_TMP_PARENT="$DIR_TMP_DEFAULT";
 728     elif [[ -d /tmp ]]; then
 729         yell "WARNING:/dev/shm not available. Falling back to /tmp .";
 730         DIR_TMP_PARENT="/tmp";
 731     else
 732         yell "ERROR:No valid working directory available. Exiting.";
 733         exit 1;
 734     fi
 735
 736     ## Set DIR_TMP using DIR_TMP_PARENT and nonce (SCRIPT_TIME_START)
 737     DIR_TMP="$DIR_TMP_PARENT"/"$SCRIPT_TIME_START""..bkgpslog" && vbm "DEBUG:Set DIR_TMP to:$DIR_TMP"; # Note: removed at end of main().
 738
 739     # Set output encryption and compression option strings
 740     if [[ "$OPTION_ENCRYPT" = "true" ]]; then # Check if encryption option active.
 741         if checkapp age; then # Check that age is available.
 742             for pubkey in "${recPubKeys[@]}"; do # Validate recipient pubkey strings by forming test message
 743                 vbm "DEBUG:Testing pubkey string:$pubkey"
 744                 if echo "butts" | age -a -r "$pubkey" 1>/dev/null; then
 745                     # Form age recipient string
 746                     recipients="$recipients""-r $pubkey ";
 747                     vbm "STATUS:Added pubkey for forming age recipient string:""$pubkey";
 748                     vbm "DEBUG:recipients:""$recipients";
 749                 else
 750                     yell "ERROR:Exit code ""$?"". Invalid recipient pubkey string. Exiting."; exit 1;
 751                 fi
 752             done
 753             vbm "DEBUG:Finished processing recPubKeys array";
 754             # Form age command string
 755             CMD_ENCRYPT="age ""$recipients ";
 756             CMD_ENCRYPT_SUFFIX=".age";
 757         else
 758             yell "ERROR:Encryption enabled but \"age\" not found. Exiting."; exit 1;
 759         fi
 760     else
 761         CMD_ENCRYPT="tee /dev/null ";
 762         CMD_ENCRYPT_SUFFIX="";
 763         vbm "DEBUG:Encryption not enabled."
 764     fi
 765     if [[ "$OPTION_COMPRESS" = "true" ]]; then # Check if compression option active
 766         if checkapp gzip; then # Check if gzip available
 767             CMD_COMPRESS="gzip ";
 768             CMD_COMPRESS_SUFFIX=".gz";
 769         else
 770             yell "ERROR:Compression enabled but \"gzip\" not found. Exiting."; exit 1;
 771         fi
 772     else
 773         CMD_COMPRESS="tee /dev/null ";
 774         CMD_COMPRESS_SUFFIX="";
 775         vbm "DEBUG:Compression not enabled.";
 776     fi
 777
 778     # Check that critical apps and dirs are available, displag missing ones.
 779     if ! checkapp gpspipe tar && ! checkdir "$DIR_OUT" "/dev/shm"; then
 780         yell "ERROR:Critical components missing.";
 781         displayMissing; yell "Exiting."; exit 1; fi
 782
 783     # Set script lifespan
 784     setScriptTTL "$SCRIPT_TTL";
 785
 786     # File name substring: encoded bufferTTL
 787     bufferTTL_STR="$(timeDuration $BUFFER_TTL)";
 788
 789     # Init temp working dir
 790     try mkdir "$DIR_TMP" && vbm "DEBUG:Working dir creatd at:$DIR_TMP";
 791
 792     # Initialize 'tar' archive
 793     ## Define output tar path (note: each day gets *one* tar file (Ex: "20200731..hostname_location.[.gpx.gz].tar"))
 794     PATHOUT_TAR="$DIR_OUT"/"$(dateShort)".."$SCRIPT_HOSTNAME""_location""$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX".tar && \
 795         vbm "STATUS:Set PATHOUT_TAR to:$PATHOUT_TAR";
 796     ## Generate VERSION file
 797     FILEOUT_VERSION="$(dateTimeShort)..VERSION";
 798     PATHOUT_VERSION="$DIR_TMP"/"$FILEOUT_VERSION";
 799     echo "$(dateTimeShort):$(basename "$0")"" Version:""$SCRIPT_VERSION" >> "$PATHOUT_VERSION" && vbm "DEBUG:VERSION created:$PATHOUT_VERSION";
 800
 801     ## Check that PATHOUT_TAR is a tar. Rename old and create empty one otherwise.
 802     checkMakeTar "$PATHOUT_TAR" && vbm "DEBUG:Confirmed or Created to be a tar:$PATHOUT_TAR";
 803
 804     ## Append VERSION file to PATHOUT_TAR
 805     try tar --append --directory="$DIR_TMP" --file="$PATHOUT_TAR" "$FILEOUT_VERSION" && \
 806         vbm "DEBUG:VERSION added to $PATHOUT_TAR";
 807
 808     # Record gps data until script lifespan ends
 809     declare debugCounter; debugCounter="0"; # set debug counter
 810     while [[ "$SECONDS" -lt "$scriptTTL" ]]; do
 811         timeBufferStart="$(dateTimeShort)"; # Note start time
 812         # Determine file paths (time is start of buffer period)
 813         FILEOUT_BASENAME="$timeBufferStart""--""$bufferTTL_STR""..""$SCRIPT_HOSTNAME""_location" && vbm "STATUS:Set FILEOUT_BASENAME to:$FILEOUT_BASENAME";
 814         ## Files saved to DIR_TMP
 815         FILEOUT_NMEA="$FILEOUT_BASENAME".nmea"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" && vbm "STATUS:Set FILEOUT_NMEA to:$FILEOUT_NMEA";
 816         FILEOUT_GPX="$FILEOUT_BASENAME".gpx"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" && vbm "STATUS:Set FILEOUT_GPX to:$FILEOUT_GPX";
 817         FILEOUT_KML="$FILEOUT_BASENAME".kml"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" && vbm "STATUS:Set FILEOUT_KML to:$FILEOUT_KML";
 818         PATHOUT_NMEA="$DIR_TMP"/"$FILEOUT_NMEA" && vbm "STATUS:Set PATHOUT_NMEA to:$PATHOUT_NMEA";
 819         PATHOUT_GPX="$DIR_TMP"/"$FILEOUT_GPX" && vbm "STATUS:Set PATHOUT_GPX to:$PATHOUT_GPX";
 820         PATHOUT_KML="$DIR_TMP"/"$FILEOUT_KML" && vbm "STATUS:Set PATHOUT_KML to:$PATHOUT_KML";
 821         ## Files saved to disk (DIR_OUT)
 822         ### one file per day (Ex: "20200731..hostname_location.[.gpx.gz].tar")
 823         PATHOUT_TAR="$DIR_OUT"/"$(dateShort)".."$SCRIPT_HOSTNAME""_location""$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX".tar && \
 824             vbm "STATUS:Set PATHOUT_TAR to:$PATHOUT_TAR";
 825         # Define GPS conversion commands
 826         CMD_CONV_NMEA="tee /dev/null " && vbm "STATUS:Set CMD_CONV_NMEA to:$CMD_CONV_NMEA"; # tee as passthrough
 827         CMD_CONV_GPX="gpsbabel -i nmea -f - -o gpx -F - " && vbm "STATUS:Set CMD_CONV_GPX to:$CMD_CONV_GPX"; # convert NMEA to GPX
 828         CMD_CONV_KML="gpsbabel -i nmea -f - -o kml -F - " && vbm "STATUS:Set CMD_CONV_KML to:$CMD_CONV_KML"; # convert NMEA to KML
 829         # Fill Bash variable buffer
 830         bufferBash="$(timeout "$BUFFER_TTL""s" gpspipe -r)" && vbm "STATUS:Successfully filled bufferBash variable with gpspipe data."; # Record gpspipe nmea data to buffer for bufferTTL seconds
 831         # Process bufferBash, save secured chunk set to DIR_TMP
 832         vbm "STATUS:Beginning to save data to $DIR_TMP";
 833         magicWriteBuffer &
 834         # Append each secured chunk in memory dir (DIR_TMP) to file on disk (PATHOUT_TAR in DIR_OUT)
 835         vbm "STATUS:DIR_TMP     :$DIR_TMP";
 836         vbm "STATUS:PATHOUT_TAR :$PATHOUT_TAR";
 837         vbm "STATUS:PATHOUT_NMEA:$PATHOUT_NMEA";
 838         vbm "STATUS:PATHOUT_GPX:$PATHOUT_GPX";
 839         vbm "STATUS:PATHOUT_KML:$PATHOUT_KML";
 840
 841         # Reset buffer and filenames
 842         unset bufferBash FILEOUT_BASENAME PATHOUT_NMEA PATHOUT_GPX PATHOUT_KML PATHOUT_TAR timeBufferStart;
 843         vbm "DEBUG:Completed buffer session $debugCounter ." 1>&2;
 844         ((debugCounter++))
 845     done
 846
 847     # Remove DIR_TMP
 848     try rm -r "$DIR_TMP";
 849
 850     vbm "STATUS:Main function finished.";
 851 } # Main function.
 852 #===END Declare local script functions===
 853 #==END Define script parameters==
 854
 855
 856 #==BEGIN Perform work and exit==
 857 main "$@" # Run main function.
 858 exit 0;
 859 #==END Perform work and exit==