X-Git-Url: https://zdv2.bktei.com/gitweb/EVA-2020-02.git/blobdiff_plain/c609b9c8d377902faa6a979eea643b239e3e4a62..6dc001d197f7074ee9258c34f20c3aa67e2bc6eb:/exec/bkgpslog?ds=inline

diff --git a/exec/bkgpslog b/exec/bkgpslog
index 043dc05..1600716 100755
--- a/exec/bkgpslog
+++ b/exec/bkgpslog
@@ -1,19 +1,132 @@
 #!/bin/bash
 
-# Author: Steven Baltakatei Sandoval
+# Desc: Records gps data until midnight
+# Author: Steven Baltakatei Sandoval; License: GPLv3+
+# Usage: bkgpslog -o [output dir]
 
-#== Variable Initialization ==
+#==BEGIN Define script parameters==
+## Logging Behavior parameters
+BUFFER_TTL="60"; # time between file writes
+SCRIPT_TTL="day"; # (day|hour)
+#### TZ="UTC"; export TZ; # Default time zone; overridden by '--time-zone=[str]' option
+DIR_TMP_DEFAULT="/dev/shm"; # Default parent of working directory
 
-#== Global constants ==
-PATH="/usr/local/bin/:$PATH"    # Add default OpenTimestamps path to PATH (necessary if cron used to call this script)
-PATH="/opt/bktei:$PATH"         # Add default baltakatei script install directory to PATH (necessary for other bk scripts)
-SCRIPT_HOSTNAME=$(hostname)     # Save hostname of system running this script.
-SCRIPT_VERSION="bkgpslog 0.0.1" # Define version of script.
-SCRIPT_TIME_SHORT="$(date +%Y%m%dT%H%M%S%z)" # Save current date & time in ISO-8601 format.
-SCRIPT_DATE_SHORT="$(date +%Y%m%d)"          # Save current date in ISO-8601 format.
-#DIROUT1="/home/pi/Sync/Evanescent_Location"  # Define output directory.
+SCRIPT_TIME_START=$(date +%Y%m%dT%H%M%S.%N);
+PATH="$HOME/.local/bin:$PATH";   # Add "$(systemd-path user-binaries)" path in case apps saved there
+SCRIPT_HOSTNAME=$(hostname);     # Save hostname of system running this script.
+SCRIPT_VERSION="bkgpslog 0.1.0"; # Define version of script.
+
+declare -Ag appRollCall # Associative array for storing app status
+declare -Ag fileRollCall # Associative array for storing file status
+declare -Ag dirRollCall # Associative array for storing dir status
+declare -a recPubKeys # for processArguments function
+declare recipients # for main function
+
+## Initialize variables
+OPTION_VERBOSE=""; OPTION_ENCRYPT=""; OPTION_COMPRESS=""; OPTION_TMPDIR="";
+
+#===BEGIN Declare local script functions===
+checkapp() {
+    # Desc: If arg is a command, save result in assoc array 'appRollCall'
+    # Usage: checkapp arg1 arg2 arg3 ...
+    # Input: global assoc. array 'appRollCall'
+    # Output: adds/updates key(value) to global assoc array 'appRollCall'
+    local returnState    
+    #echo "DEBUG:$(date +%S.%N)..Starting checkapp function."
+    #echo "DEBUG:args: $@"
+    #echo "DEBUG:returnState:$returnState"
+
+    #===Process Args===
+    for arg in "$@"; do
+	#echo "DEBUG:processing arg:$arg"
+	if command -v "$arg" 1>/dev/null 2>&1; then # Check if arg is a valid command
+	    appRollCall[$arg]="true";
+	    #echo "DEBUG:appRollCall[$arg]:"${appRollCall[$arg]}
+	    if ! [ "$returnState" = "false" ]; then returnState="true"; fi
+	else
+	    appRollCall[$arg]="false"; returnState="false";
+	fi
+    done
+    
+    #for key in "${!appRollCall[@]}"; do echo "DEBUG:$key => ${appRollCall[$key]}"; done
+    #echo "DEBUG:evaluating returnstate. returnState:"$returnState
+
+    #===Determine function return code===
+    if [ "$returnState" = "true" ]; then
+	#echo "DEBUG:checkapp returns true for $arg";
+	return 0;
+    else
+	#echo "DEBUG:checkapp returns false for $arg";
+	return 1;
+    fi
+} # Check that app exists
+checkfile() {
+    # Desc: If arg is a file path, save result in assoc array 'fileRollCall'
+    # Usage: checkfile arg1 arg2 arg3 ...
+    # Input: global assoc. array 'fileRollCall'
+    # Output: adds/updates key(value) to global assoc array 'fileRollCall';
+    # Output: returns 0 if app found, 1 otherwise
+    local returnState
+
+    #===Process Args===
+    for arg in "$@"; do
+	#echo "DEBUG:processing arg:$arg"
+	if [ -f "$arg" ]; then
+	    fileRollCall["$arg"]="true";
+	    #echo "DEBUG:fileRollCall[\"$arg\"]:"${fileRollCall["$arg"]}
+	    if ! [ "$returnState" = "false" ]; then returnState="true"; fi
+	else
+	    fileRollCall["$arg"]="false"; returnState="false";
+	fi
+    done
+
+    #for key in "${!fileRollCall[@]}"; do echo "DEBUG:fileRollCall key [$key] is:${fileRollCall[$key]}"; done
+    #echo "DEBUG:evaluating returnstate. returnState:"$returnState
+    
+    #===Determine function return code===
+    if [ "$returnState" = "true" ]; then
+	#echo "DEBUG:checkapp returns true for $arg";
+	return 0;
+    else
+	#echo "DEBUG:checkapp returns false for $arg";
+	return 1;
+    fi
+} # Check that file exists
+checkdir() {
+    # Desc: If arg is a dir path, save result in assoc array 'dirRollCall'
+    # Usage: checkdir arg1 arg2 arg3 ...
+    # Input: global assoc. array 'dirRollCall'
+    # Output: adds/updates key(value) to global assoc array 'dirRollCall';
+    # Output: returns 0 if app found, 1 otherwise
+    local returnState
+
+    #===Process Args===
+    for arg in "$@"; do
+	#echo "DEBUG:processing arg:$arg"
+	if [ -d "$arg" ]; then
+	    dirRollCall["$arg"]="true";
+	    #echo "DEBUG:dirRollCall[\"$arg\"]:"${dirRollCall["$arg"]}
+	    if ! [ "$returnState" = "false" ]; then returnState="true"; fi
+	elif [ "$arg" = "" ]; then
+	    dirRollCall["$arg"]="false"; returnState="false";
+	else
+	    returnState="false";
+	fi
+    done
+
+    #for key in "${!dirRollCall[@]}"; do echo "DEBUG:dirRollCall key [$key] is:${dirRollCall[$key]}"; done
+    #echo "DEBUG:evaluating returnstate. returnState:"$returnState
+    
+    #===Determine function return code===
+    if [ "$returnState" = "true" ]; then
+	#echo "DEBUG:checkapp returns true for $arg";
+	return 0;
+    else
+	#echo "DEBUG:checkapp returns false for $arg";
+	return 1;
+    fi
+} # Check that dir exists
 
-#== Script Function Definitions ==
 # Yell, Die, Try Three-Fingered Claw technique
 # Ref/Attrib: https://stackoverflow.com/a/25515370
 yell() { echo "$0: $*" >&2; }
@@ -25,7 +138,7 @@ echoerr() {
 } # Define stderr message function.
 showUsage() {
     echoerr "USAGE:"
-    echoerr "    bkgpslog.sh [ options ]"
+    echoerr "    bkgpslog [ options ]"
     echoerr
     echoerr "OPTIONS:"
     echoerr "    -h, --help"
@@ -37,76 +150,631 @@ showUsage() {
     echoerr "    -v, --verbose"
     echoerr "            Display debugging info."
     echoerr
+    echoerr "    -e, --encrypt"
+    echoerr "            Encrypt output."
+    echoerr
+    echoerr "    -r, --recipient [ pubkey string ]"
+    echoerr "            Specify recipient. May be age or ssh pubkey."
+    echoerr "            See https://github.com/FiloSottile/age"
+    echoerr
     echoerr "    -o, --output [ directory ]"
     echoerr "            Specify output directory to save logs."
+    echoerr
+    echoerr "    -c, --compress"
+    echoerr "            Compress output with gzip (before encryption if enabled)."
+    echoerr
+    echoerr "    -z, --time-zone"
+    echoerr "            Specify time zone. (ex: \"America/New_York\")"
+    echoerr
+    echoerr "    -t, --temp-dir"
+    echoerr "            Specify parent directory for temporary working directory."
+    echoerr "            Default: \"/dev/shm\""
+    echoerr
+    echoerr "EXAMPLE: (bash script lines)"
+    echoerr "/bin/bash bkgpslog -e -c \\"
+    echoerr "-r age1mrmfnwhtlprn4jquex0ukmwcm7y2nxlphuzgsgv8ew2k9mewy3rs8u7su5 \\"
+    echoerr "-r age1ala848kqrvxc88rzaauc6vc5v0fqrvef9dxyk79m0vjea3hagclswu0lgq \\"
+    echoerr "-o ~/Sync/Location"
 } # Display information on how to use this script.
 showVersion() {
     echoerr "$SCRIPT_VERSION"
 } # Display script version.
 vbm() {
-    if [ $OPTION_VERBOSE -eq "true" ]; then
-	echoerr "$@"
+    # Usage: vbm "DEBUG:verbose message here"
+    # Description: Prints verbose message ("vbm") to stderr if OPTION_VERBOSE is set to "true".
+    # Input:
+    #   - OPTION_VERBOSE  variable set by processArguments function. (ex: "true", "false")
+    #   - "$@"            positional arguments fed to this function.
+    # Output: stderr
+    # Script function dependencies: echoerr
+    # External function dependencies: echo
+    # Last modified: 2020-04-11T23:57Z
+    # Last modified by: Steven Baltakatei Sandoval
+    # License: GPLv3+
+    # Ref./Attrib:
+
+    if [ "$OPTION_VERBOSE" = "true" ]; then
+	FUNCTION_TIME=$(date --iso-8601=ns); # Save current time in nano seconds.
+	echoerr "[$FUNCTION_TIME] ""$*"; # Display argument text.
     fi
+
+    # End function
+    return 0; # Function finished.
 } # Verbose message display function.
 processArguments() {
     while [ ! $# -eq 0 ]; do   # While number of arguments ($#) is not (!) equal to (-eq) zero (0).
-	echoerr "DEBUG:Starting processArguments while loop."
-	echoerr "DEBUG:Provided arguments are:""$@"
+	#echoerr "DEBUG:Starting processArguments while loop."
+	#echoerr "DEBUG:Provided arguments are:""$*"
 	case "$1" in
-	    --h | --help) showUsage; exit 1;; # Display usage.
+	    -h | --help) showUsage; exit 1;; # Display usage.
 	    --version) showVersion; exit 1;; # Show version
-	    --v | --verbose) OPTION_VERBOSE="true"; vbm "DEBUG:Verbose mode enabled.";; # Enable verbose mode.
-	    --o | --output) if [ -d "$2" ]; then DIROUT1="$2"; fi ;; # Define output directory.
-	    *) echoerr "ERROR: Unrecognized argument."; exit 1;; # Handle unrecognized options.
+	    -v | --verbose) OPTION_VERBOSE="true"; vbm "DEBUG:Verbose mode enabled.";; # Enable verbose mode.
+	    -o | --output) if [ -d "$2" ]; then DIR_OUT="$2"; vbm "DEBUG:DIR_OUT:$DIR_OUT"; shift; fi ;; # Define output directory.
+	    -e | --encrypt) OPTION_ENCRYPT="true"; vbm "DEBUG:Encrypted output mode enabled.";;
+	    -r | --recipient) # Add 'age' recipient via public key string
+		recPubKeys+=("$2"); vbm "STATUS:pubkey added:""$2"; shift;;
+	    -c | --compress) OPTION_COMPRESS="true"; vbm "DEBUG:Compressed output mode enabled.";;
+	    -z | --time-zone) try setTimeZoneEV "$2"; shift;;
+	    -t | --temp-dir) OPTION_TMPDIR="true" && TMP_DIR_PRIORITY="$2"; shift;;
+	    *) echoerr "ERROR: Unrecognized argument: $1"; echoerr "STATUS:All arguments:$*"; exit 1;; # Handle unrecognized options.
 	esac
 	shift
     done
 } # Argument Processing
-checkExecutables() {
+setTimeZoneEV(){
+    # Desc: Set time zone environment variable TZ
+    # Usage: setTimeZoneEV arg1
+    # Input: arg1: 'date'-compatible timezone string (ex: "America/New_York")
+    #        TZDIR env var (optional; default: "/usr/share/zoneinfo")
+    # Output: exports TZ
+    #         exit code 0 on success
+    #         exit code 1 on incorrect number of arguments
+    #         exit code 2 if unable to validate arg1
+    # Depends: yell, printenv, bash 5
+    # Tested on: Debian 10
+    ARG1="$1"
+    local tzDir returnState
+    if ! [[ $# -eq 1 ]]; then
+	yell "ERROR:Invalid argument count.";
+	return 1;
+    fi
+
+    # Read TZDIR env var if available
+    if printenv TZDIR 1>/dev/null 2>&1; then
+	tzDir="$(printenv TZDIR)";
+    else
+	tzDir="/usr/share/zoneinfo";
+    fi
     
-} # Check that certain executables exist.
+    # Validate TZ string
+    if ! [[ -f "$tzDir"/"$ARG1" ]]; then
+	yell "ERROR:Invalid time zone argument.";
+	return 2;
+    else
+    # Export ARG1 as TZ environment variable
+	TZ="$ARG1" && export TZ && returnState="true";
+    fi
 
-main() {
-    processArguments # Process arguments.
-    checkExecutables "gpspipe" # Confirm that executables necessary to run are available.
-} # Main function.
+    # Determine function return code
+    if [ "$returnState" = "true" ]; then
+	return 0;
+    fi
+} # Exports TZ environment variable
+timeUntilNextDay(){
+    # Desc: Report seconds until next day.
+    # Output: stdout: integer seconds until next day
+    # Output: exit code 0 if stdout > 0; 1 if stdout = 0; 2 if stdout < 0
+    # Usage: timeUntilNextDay
+    # Usage: if ! myTTL="$(timeUntilNextDay)"; then yell "ERROR in if statement"; exit 1; fi
+    local returnState TIME_CURRENT TIME_NEXT_DAY SECONDS_UNTIL_NEXT_DAY
+    TIME_CURRENT="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
+    TIME_NEXT_DAY="$(date -d "$TIME_CURRENT next day" --iso-8601=date)"; # Produce timestamp of beginning of tomorrow with resolution of 1 second.
+    SECONDS_UNTIL_NEXT_DAY="$(( $(date +%s -d "$TIME_NEXT_DAY") - $(date +%s -d "$TIME_CURRENT") ))" ; # Calculate seconds until closest future midnight (res. 1 second).
+    if [[ "$SECONDS_UNTIL_NEXT_DAY" -gt 0 ]]; then
+	returnState="true";
+    elif [[ "$SECONDS_UNTIL_NEXT_DAY" -eq 0 ]]; then
+	returnState="WARNING_ZERO";
+	yell "WARNING:Reported time until next day exactly zero.";
+    elif [[ "$SECONDS_UNTIL_NEXT_DAY" -lt 0 ]]; then
+	returnState="WARNING_NEGATIVE";
+	yell "WARNING:Reported time until next day is negative.";
+    fi
 
+    try echo "$SECONDS_UNTIL_NEXT_DAY"; # Report
+    
+    #===Determine function return code===
+    if [[ "$returnState" = "true" ]]; then
+	return 0;
+    elif [[ "$returnState" = "WARNING_ZERO" ]]; then
+	return 1;
+    elif [[ "$returnState" = "WARNING_NEGATIVE" ]]; then
+	return 2;
+    fi
+} # Report seconds until next day
+timeUntilNextHour(){
+    # Desc: Report seconds until next hour
+    # Output: stdout: integer seconds until next hour
+    # Output: exit code 0 if stdout > 0; 1 if stdout = 0; 2 if stdout < 0
+    # Usage: timeUntilNextHour
+    # Usage: if ! myTTL="$(timeUntilNextHour)"; then yell "ERROR in if statement"; exit 1; fi
+    local returnState TIME_CURRENT TIME_NEXT_HOUR SECONDS_UNTIL_NEXT_HOUR
+    TIME_CURRENT="$(date --iso-8601=seconds)"; # Produce `date`-parsable current timestamp with resolution of 1 second.
+    TIME_NEXT_HOUR="$(date -d "$TIME_CURRENT next hour" --iso-8601=hours)"; # Produce `date`-parsable current time stamp with resolution of 1 second.
+    SECONDS_UNTIL_NEXT_HOUR="$(( $(date +%s -d "$TIME_NEXT_HOUR") - $(date +%s -d "$TIME_CURRENT") ))"; # Calculate seconds until next hour (res. 1 second).
+    if [[ "$SECONDS_UNTIL_NEXT_HOUR" -gt 0 ]]; then
+	returnState="true";
+    elif [[ "$SECONDS_UNTIL_NEXT_HOUR" -eq 0 ]]; then
+	returnState="WARNING_ZERO";
+	yell "WARNING:Reported time until next hour exactly zero.";
+    elif [[ "$SECONDS_UNTIL_NEXT_HOUR" -lt 0 ]]; then
+	returnState="WARNING_NEGATIVE";
+	yell "WARNING:Reported time until next hour is negative.";
+    fi
 
+    try echo "$SECONDS_UNTIL_NEXT_HOUR"; # Report
+    
+    #===Determine function return code===
+    if [[ "$returnState" = "true" ]]; then
+	return 0;
+    elif [[ "$returnState" = "WARNING_ZERO" ]]; then
+	return 1;
+    elif [[ "$returnState" = "WARNING_NEGATIVE" ]]; then
+	return 2;
+    fi
+} # Report seconds until next hour
+dateTimeShort(){
+    # Desc: Timestamp without separators (YYYYmmddTHHMMSS+zzzz)
+    # Usage: dateTimeShort
+    # Output: stdout: timestamp (ISO-8601, no separators)
+    local TIME_CURRENT TIME_CURRENT_SHORT
+    TIME_CURRENT="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
+    TIME_CURRENT_SHORT="$(date -d "$TIME_CURRENT" +%Y%m%dT%H%M%S%z)"; # Produce separator-less current timestamp with resolution 1 second.
+    echo "$TIME_CURRENT_SHORT";
+} # Get YYYYmmddTHHMMSS±zzzz
+dateShort(){
+    # Desc: Date without separators (YYYYmmdd)
+    # Usage: dateShort
+    # Output: stdout: date (ISO-8601, no separators)
+    local TIME_CURRENT DATE_CURRENT_SHORT
+    TIME_CURRENT="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
+    DATE_CURRENT_SHORT="$(date -d "$TIME_CURRENT" +%Y%m%d)"; # Produce separator-less current date with resolution 1 day.
+    echo "$DATE_CURRENT_SHORT";
+} # Get YYYYmmdd
+timeDuration(){
+    # Desc: Output approximate time duration string before given time (default:current date)
+    # Ref/Attrib: ISO-8601:2004(E), §4.4.4.2 Representations of time intervals by duration and context information
+    # Note: "1 month" ("P1M") is assumed to be "30 days" (see ISO-8601:2004(E), §2.2.1.2)
+    # Usage: timeDuration [arg1] ([arg2])
+    # Input: arg1: seconds as base 10 integer >= 0  (ex: 3601)
+    #        arg2: precision level (optional; default=2)
+    # Output: stdout: ISO-8601 duration string (ex: "P1H1S", "P2Y10M15DT10H30M20S")
+    # Example: 'timeDuration 111111 3' yields 'P1DT6H51M'
+    # Depends: date 8 (gnucoreutils)
+    local returnState fullHours fullMinutes fullSeconds;
+    ARG1="$1";
+    ARG2="$2";
+    precision=2; # set default precision
+    returnState="true"; # set default return state
 
+    # Check that between one and two arguments is supplied
+    if ! { [[ $# -ge 1 ]] && [[ $# -le 2 ]]; }; then
+	yell "ERROR:Invalid number of arguments:$# . Exiting.";
+	returnState="ERROR_INPUT"; fi
 
+    # Check that arg1 provided
+    if [[ $# -ge 1 ]]; then
+	# Check that arg1 is a positive integer
+	if [[ "$ARG1" =~ ^[[:digit:]]+$ ]]; then
+   	    arg1Valid="true";
+	else
+	    yell "ERROR:ARG1 not a digit.";
+	    returnState="ERROR_INPUT";
+	    arg1Valid="false";
+	fi
+    else
+	yell "ERROR:No argument provided. Exiting.";
+	exit 1;
+    fi
 
+    # Consider whether arg2 was provided
+    if  [[ $# -eq 2 ]]; then
+	# Check that the second arg is a positive integer
+	if [[ "$ARG2" =~ ^[[:digit:]]+$ ]] && [[ "ARG2" -gt 0 ]]; then
+	arg2Valid="true";
+	precision="$ARG2";
+	else
+	    yell "ERROR:ARG2 not a positive integer. (is $ARG2 ). Leaving early.";
+	    returnState="ERROR_INPUT";
+	    arg2Valid="false";
+	fi;
+    else
+	arg2Valid="false";
+    fi;
+    
+    remainder="$ARG1" ; # seconds
+    ## Calculate full years Y, update remainder
+    fullYears=$(( remainder / (365*24*60*60) ));
+    remainder=$(( remainder - (fullYears*365*24*60*60) ));
+    ## Calculate full months M, update remainder
+    fullMonths=$(( remainder / (30*24*60*60) ));
+    remainder=$(( remainder - (fullMonths*30*24*60*60) ));
+    ## Calculate full days D, update remainder
+    fullDays=$(( remainder / (24*60*60) ));
+    remainder=$(( remainder - (fullDays*24*60*60) ));
+    ## Calculate full hours H, update remainder
+    fullHours=$(( remainder / (60*60) ));
+    remainder=$(( remainder - (fullHours*60*60) ));
+    ## Calculate full minutes M, update remainder
+    fullMinutes=$(( remainder / (60) ));
+    remainder=$(( remainder - (fullMinutes*60) ));
+    ## Calculate full seconds S, update remainder
+    fullSeconds=$(( remainder / (1) ));
+    remainder=$(( remainder - (remainder*1) ));
+    ## Check which fields filled
+    if [[ $fullYears -gt 0 ]]; then hasYears="true"; else hasYears="false"; fi
+    if [[ $fullMonths -gt 0 ]]; then hasMonths="true"; else hasMonths="false"; fi
+    if [[ $fullDays -gt 0 ]]; then hasDays="true"; else hasDays="false"; fi
+    if [[ $fullHours -gt 0 ]]; then hasHours="true"; else hasHours="false"; fi
+    if [[ $fullMinutes -gt 0 ]]; then hasMinutes="true"; else hasMinutes="false"; fi
+    if [[ $fullSeconds -gt 0 ]]; then hasSeconds="true"; else hasSeconds="false"; fi
+    
+    ## Determine which fields to display (see ISO-8601:2004 §4.4.3.2)
+    witherPrecision="false"
+    
+    ### Years
+    if $hasYears && [[ $precision -gt 0 ]]; then
+	displayYears="true";
+	witherPrecision="true";
+    else
+	displayYears="false";
+    fi;
+    if $witherPrecision; then ((precision--)); fi;
+    
+    ### Months
+    if $hasMonths && [[ $precision -gt 0 ]]; then
+	displayMonths="true";
+	witherPrecision="true";
+    else
+	displayMonths="false";
+    fi;
+    if $witherPrecision && [[ $precision -gt 0 ]]; then
+	displayMonths="true";
+    fi;
+    if $witherPrecision; then ((precision--)); fi;
+
+    ### Days
+    if $hasDays && [[ $precision -gt 0 ]]; then
+	displayDays="true";
+	witherPrecision="true";
+    else
+	displayDays="false";
+    fi;
+    if $witherPrecision && [[ $precision -gt 0 ]]; then
+	displayDays="true";
+    fi;
+    if $witherPrecision; then ((precision--)); fi;
+
+    ### Hours
+    if $hasHours && [[ $precision -gt 0 ]]; then
+	displayHours="true";
+	witherPrecision="true";
+    else
+	displayHours="false";
+    fi;
+    if $witherPrecision && [[ $precision -gt 0 ]]; then
+	displayHours="true";
+    fi;
+    if $witherPrecision; then ((precision--)); fi;
+
+    ### Minutes
+    if $hasMinutes && [[ $precision -gt 0 ]]; then
+	displayMinutes="true";
+	witherPrecision="true";
+    else
+	displayMinutes="false";
+    fi;
+    if $witherPrecision && [[ $precision -gt 0 ]]; then
+	displayMinutes="true";
+    fi;
+    if $witherPrecision; then ((precision--)); fi;
+
+    ### Seconds
+
+    if $hasSeconds && [[ $precision -gt 0 ]]; then
+	displaySeconds="true";
+	witherPrecision="true";
+    else
+	displaySeconds="false";
+    fi;
+    if $witherPrecision && [[ $precision -gt 0 ]]; then
+	displaySeconds="true";
+    fi;
+    if $witherPrecision; then ((precision--)); fi;
+
+
+
+    ## Determine whether or not the "T" separator is needed to separate date and time elements
+    if ( $displayHours || $displayMinutes || $displaySeconds); then
+	displayDateTime="true"; else displayDateTime="false"; fi
+    
+    ## Construct duration output string
+    OUTPUT="P"
+    if $displayYears; then
+	OUTPUT=$OUTPUT$fullYears"Y"; fi
+    if $displayMonths; then
+	OUTPUT=$OUTPUT$fullMonths"M"; fi
+    if $displayDays; then
+	OUTPUT=$OUTPUT$fullDays"D"; fi
+    if $displayDateTime; then
+	OUTPUT=$OUTPUT"T"; fi
+    if $displayHours; then
+	OUTPUT=$OUTPUT$fullHours"H"; fi
+    if $displayMinutes; then
+	OUTPUT=$OUTPUT$fullMinutes"M"; fi
+    if $displaySeconds; then
+	OUTPUT=$OUTPUT$fullSeconds"S"; fi
 
-if [[ -d "$DIROUT1" ]] && command -v "gpspipe" 1>/dev/null 2>/dev/null ; then
-    while true; do
-	#echoerr "DEBUG:Starting while loop."
-	# Update time constants
-	TIME_CURRENT="$(date --iso-8601=seconds)" ;
-	#echoerr "DEBUG:TIME_CURRENT is:""$TIME_CURRENT" ;
-	TIME_CURRENT_SHORT="$(date -d "$TIME_CURRENT" +%Y%m%dT%H%M%S%z)"
-	#echoerr "DEBUG:TIME_CURRENT_SHORT is""$TIME_CURRENT_SHORT"
-	DATE_CURRENT="$(date -d "$TIME_CURRENT" --iso-8601=date)" ;
-	#echoerr "DEBUG:DATE_CURRENT is:""$DATE_CURRENT" ;
-	DATE_CURRENT_SHORT="$(date -d "$TIME_CURRENT" +%Y%m%d)" ;
-	#echoerr "DEBUG:DATE_CURRENT is:""$DATE_CURRENT_SHORT" ;
-	DATE_TOMORROW="$(date -d "$TIME_CURRENT next day" --iso-8601=date)" ;
-	#echoerr "DEBUG:DATE_TOMORROW is:""$DATE_TOMORROW" ;
-	TIME_NEXT_MIDNIGHT="$(date -d "$DATE_TOMORROW" --iso-8601=seconds)" ;
-	#echoerr "DEBUG:TIME_NEXT_MIDNIGHT is:""$TIME_NEXT_MIDNIGHT" ;
-	SECONDS_UNTIL_NEXT_MIDNIGHT="$((  $(date +%s -d "$TIME_NEXT_MIDNIGHT") - $(date +%s -d "$TIME_CURRENT")  ))" ;
-	#echoerr "DEBUG:SECONDS_UNTIL_NEXT_MIDNIGHT is:""$SECONDS_UNTIL_NEXT_MIDNIGHT" ;
-	if [ "$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.
-	if [ "$SECONDS_UNTIL_NEXT_MIDNIGHT" -lt 0 ]; then echoerr "ERROR:Time until midnight error." ; exit 1; fi ; # Exit script if equal to 0 because "timeout 0s" never ends.
-	
-	# Update output file names.
-	DIROUTN="$DIROUT1" ;
-	FILEOUTN="$DATE_CURRENT_SHORT""..""$(hostname)""_location.nmea" ;
-
-	# Append location log until midnight.
-	timeout "$SECONDS_UNTIL_NEXT_MIDNIGHT""s" gpspipe -r 1>> "$DIROUTN"/"$FILEOUTN" 2>>/dev/null ; # log raw nmea data
+    ## Output duration string to stdout
+    if [[ "$returnState" = "true" ]]; then echo "$OUTPUT"; fi
+
+    #===Determine function return code===
+    if [ "$returnState" = "true" ]; then
+	return 0;
+    else
+	echo "$returnState" 1>&2;
+	return 1;
+    fi
+
+} # Get duration (ex: PT10M4S )
+displayMissing() {
+    # Desc: Displays missing apps, files, and dirs
+    # Usage: displayMissing
+    # Input: associative arrays: appRollCall, fileRollCall, dirRollCall
+    # Output: stderr messages
+    #==BEGIN Display errors==
+    #===BEGIN Display Missing Apps===
+    missingApps="Missing apps  :"
+    #for key in "${!appRollCall[@]}"; do echo "DEBUG:$key => ${appRollCall[$key]}"; done
+    for key in "${!appRollCall[@]}"; do
+	value="${appRollCall[$key]}"
+	if [ "$value" = "false" ]; then
+	    #echo "DEBUG:Missing apps: $key => $value";
+	    missingApps="$missingApps""$key "
+	    appMissing="true"
+	fi
+    done
+    if [ "$appMissing" = "true" ]; then  # Only indicate if an app is missing.
+	echo "$missingApps" 1>&2;
+    fi
+    #===END Display Missing Apps===
+
+    #===BEGIN Display Missing Files===
+    missingFiles="Missing files:"
+    #for key in "${!fileRollCall[@]}"; do echo "DEBUG:$key => ${fileRollCall[$key]}"; done
+    for key in "${!fileRollCall[@]}"; do
+	value="${fileRollCall[$key]}"
+	if [ "$value" = "false" ]; then
+	    #echo "DEBUG:Missing files: $key => $value";
+	    missingFiles="$missingFiles""$key "
+	    fileMissing="true"
+	fi
     done
+    if [ "$fileMissing" = "true" ]; then  # Only indicate if an app is missing.
+	echo "$missingFiles" 1>&2;
+    fi
+    #===END Display Missing Files===
+
+    #===BEGIN Display Missing Directories===
+    missingDirs="Missing dirs:"
+    #for key in "${!dirRollCall[@]}"; do echo "DEBUG:$key => ${dirRollCall[$key]}"; done
+    for key in "${!dirRollCall[@]}"; do
+	value="${dirRollCall[$key]}"
+	if [ "$value" = "false" ]; then
+	    #echo "DEBUG:Missing dirs: $key => $value";
+	    missingDirs="$missingDirs""$key "
+	    dirMissing="true"
+	fi
+    done
+    if [ "$dirMissing" = "true" ]; then  # Only indicate if an dir is missing.
+	echo "$missingDirs" 1>&2;
+    fi
+    #===END Display Missing Directories===
+
+    #==END Display errors==
+} # Display missing apps, files, dirs
+setScriptTTL() {
+    #Desc: Sets script TTL
+    #Usage: setScriptTTL arg1
+    #Input: arg1: "day" or "hour"
+    #Output: scriptTTL
+    #Depends: timeUntilNextHour or timeUntilNextDay
+    local ARG1
+    ARG1="$1"
+    if [[ "$ARG1" = "day" ]]; then
+	    # Set script lifespan to end at start of next day
+	if ! scriptTTL="$(timeUntilNextDay)"; then
+	    if [[ "$scriptTTL" -eq 0 ]]; then
+	    ((scriptTTL++)); # Add 1 because 0 would cause 'timeout' to never timeout.
+	    else
+	    yell "ERROR: timeUntilNextDay exit code $?"; exit 1;
+	    fi;
+	fi;
+    elif [[ "$ARG1" = "hour" ]]; then
+	# Set script lifespan to end at start of next hour
+	if ! scriptTTL="$(timeUntilNextHour)"; then
+	    if [[ "$scriptTTL" -eq 0 ]]; then
+		((scriptTTL++)); # Add 1 because 0 would cause 'timeout' to never timeout.
+	    else
+		yell "ERROR: timeUntilNextHour exit code $?"; exit 1;
+	    fi;
+	fi;
+    else
+	yell "ERROR:Invalid argument for setScriptTTL function."; exit 1;
+    fi
+} # Seconds until next (day|hour).
+main() {
+    processArguments "$@" # Process arguments.
+    
+    # Determine working directory
+    ## Set DIR_TMP_PARENT to user-specified value if specified
+    if [[ "$OPTION_TMPDIR" = "true" ]]; then
+	    if [[ -d "$TMP_DIR_PRIORITY" ]]; then
+	    DIR_TMP_PARENT="$OPTION_TMPDIR"; 
+	else
+	    yell "WARNING:Specified temporary working directory not valid:$OPTION_TMP_DIR";
+	    exit 1;
+	fi
+    fi
+
+    ## Set DIR_TMP_PARENT to default or fallback otherwise
+    if [[ -d "$DIR_TMP_DEFAULT" ]]; then
+	DIR_TMP_PARENT="$DIR_TMP_DEFAULT";
+    elif [[ -d /tmp ]]; then
+	yell "WARNING:/dev/shm not available. Falling back to /tmp .";
+	DIR_TMP_PARENT="/tmp";
+    else
+	yell "ERROR:No valid working directory available. Exiting.";
+	exit 1;
+    fi
+
+    ## Set DIR_TMP using DIR_TMP_PARENT and nonce (SCRIPT_TIME_START)
+    DIR_TMP="$DIR_TMP_PARENT"/"$SCRIPT_TIME_START""..bkgpslog" && vbm "DEBUG:Set DIR_TMP to:$DIR_TMP"; # Note: removed at end of main().
     
-    #gpspipe -r -d -l -o "$DIROUT1"/"$FILEOUT1" ;
+    # Set output encryption and compression option strings
+    if [[ "$OPTION_ENCRYPT" = "true" ]]; then # Check if encryption option active.
+	if checkapp age; then # Check that age is available.
+	    for pubkey in "${recPubKeys[@]}"; do # Validate recipient pubkey strings by forming test message
+		vbm "DEBUG:Testing pubkey string:$pubkey"
+		if echo "butts" | age -a -r "$pubkey" 1>/dev/null; then
+		    # Form age recipient string
+		    recipients="$recipients""-r $pubkey ";
+		    vbm "STATUS:Added pubkey for forming age recipient string:""$pubkey";
+		    vbm "DEBUG:recipients:""$recipients";
+		else
+		    yell "ERROR:Exit code ""$?"". Invalid recipient pubkey string. Exiting."; exit 1;
+		fi
+	    done
+	    vbm "DEBUG:Finished processing recPubKeys array";
+	    # Form age command string
+	    CMD_ENCRYPT="age ""$recipients ";
+	    CMD_ENCRYPT_SUFFIX=".age";
+	else
+	    yell "ERROR:Encryption enabled but \"age\" not found. Exiting."; exit 1;
+	fi
+    else
+	CMD_ENCRYPT="tee /dev/null ";
+	CMD_ENCRYPT_SUFFIX="";
+	vbm "DEBUG:Encryption not enabled."
+    fi
+    if [[ "$OPTION_COMPRESS" = "true" ]]; then # Check if compression option active
+	if checkapp gzip; then # Check if gzip available
+	    CMD_COMPRESS="gzip ";
+	    CMD_COMPRESS_SUFFIX=".gz";
+	else
+	    yell "ERROR:Compression enabled but \"gzip\" not found. Exiting."; exit 1;
+	fi
+    else
+	CMD_COMPRESS="tee /dev/null ";
+	CMD_COMPRESS_SUFFIX="";
+	vbm "DEBUG:Compression not enabled."
+    fi
+
+    # Check that critical apps and dirs are available, displag missing ones.
+    if ! checkapp gpspipe tar && ! checkdir "$DIR_OUT" "/dev/shm"; then
+	yell "ERROR:Critical components missing.";
+	displayMissing; yell "Exiting."; exit 1; fi
+
+    # Set script lifespan
+    setScriptTTL "$SCRIPT_TTL";
+
+    # File name substring: encoded bufferTTL
+    bufferTTL_STR="$(timeDuration $BUFFER_TTL)";
+
+    # Init temp working dir
+    try mkdir "$DIR_TMP" && vbm "DEBUG:Working dir creatd at:$DIR_TMP";
+
+    # Initialize 'tar' archive
+    ## Define output tar path (note: each day gets *one* tar file (Ex: "20200731..hostname_location.[.gpx.gz].tar"))
+    PATHOUT_TAR="$DIR_OUT"/"$(dateShort)".."$SCRIPT_HOSTNAME""_location""$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX".tar && \
+	vbm "STATUS:Set PATHOUT_TAR to:$PATHOUT_TAR";
+    ## Write bkgpslog version to DIR_TMP/VERSION
+    echo "$(dateTimeShort):$(basename "$0")"" Version:""$SCRIPT_VERSION" >> "$DIR_TMP/VERSION" && vbm "DEBUG:VERSION created.";
+    ## Check if PATHOUT_TAR already exists.
+    if [[ -f "$PATHOUT_TAR" ]]; then
+	vbm "STATUS:Output tar already exists:$PATHOUT_TAR";
+	### Check if preexisting tar is appendable.
+	PATHOUT_APPENDTEST="$DIR_TMP"/"$(dateTimeShort)..RESUMING_LOGGING_SESSION.txt" && \
+	    vbm "DEBUG:Set PATHOUT_APPENDTEST to:$PATHOUT_APPENDTEST";
+	echo "$(dateTimeShort):""$(basename "$0")"" version $SCRIPT_VERSION resuming logging session." >> "$PATHOUT_APPENDTEST" && \
+	    vbm "DEBUG:""$PATHOUT_APPENDTEST"" created."
+	if ! tar --append --directory="$DIR_TMP" --file="$PATHOUT_TAR" "$(basename "$PATHOUT_APPENDTEST")"; then
+	    ### If not appendable, label tar broken, move tar, proceed.
+	    mv "$PATHOUT_TAR" "${PATHOUT_TAR%.*}""-broken$(dateTimeShort)".tar && \
+		vbm "DEBUG:tar not writable, moving out of the way $PATHOUT_TAR";
+	fi
+    else
+	vbm "STATUS:Output tar does not already exist. Creating:$PATHOUT_TAR"
+	### If (no preexisting|appendable) tar found, create empty tar archive at PATHOUT_TAR
+	try tar --create --directory="$DIR_TMP" --file="$PATHOUT_TAR" --files-from=/dev/null && \
+	    vbm "DEBUG:Empty tar created at:$PATHOUT_TAR";
+    fi	
+    ## Append VERSION file to PATHOUT_TAR
+    try tar --append --directory="$DIR_TMP" --file="$PATHOUT_TAR" "VERSION" && \
+	vbm "DEBUG:VERSION added to $PATHOUT_TAR";
     
-else
-    echo "$SCRIPT_TIME_SHORT"">gpspipe or $DIROUT1 not found." >> ~/"$SCRIPT_DATE_SHORT"..error.log ;
-fi
+    # Record gps data until script lifespan ends
+    declare debugCounter; debugCounter="0"; # set debug counter
+    timeStart=$(dateTimeShort); # Note start time
+    while [[ "$SECONDS" -lt "$scriptTTL" ]]; do
+	# Determine file paths (time is start of buffer period)
+	FILEOUT_BASENAME="$timeStart""--""$bufferTTL_STR""..""$SCRIPT_HOSTNAME""_location" && vbm "STATUS:Set FILEOUT_BASENAME to:$FILEOUT_BASENAME";
+	## Files saved to DIR_TMP
+	PATHOUT_NMEA="$DIR_TMP"/"$FILEOUT_BASENAME".nmea"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" && vbm "STATUS:Set PATHOUT_NMEA to:$PATHOUT_NMEA";
+	PATHOUT_GPX="$DIR_TMP"/"$FILEOUT_BASENAME".gpx"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" && vbm "STATUS:Set PATHOUT_GPX to:$PATHOUT_GPX";
+	PATHOUT_KML="$DIR_TMP"/"$FILEOUT_BASENAME".kml"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" && vbm "STATUS:Set PATHOUT_KML to:$PATHOUT_KML";
+	## Files saved to disk (DIR_OUT)
+	### one file per day (Ex: "20200731..hostname_location.[.gpx.gz].tar")
+	PATHOUT_TAR="$DIR_OUT"/"$(dateShort)".."$SCRIPT_HOSTNAME""_location""$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX".tar && \
+	    vbm "STATUS:Set PATHOUT_TAR to:$PATHOUT_TAR"
+	# Define GPS conversion commands
+	CMD_CONV_NMEA="tee /dev/null " && vbm "STATUS:Set CMD_CONV_NMEA to:$CMD_CONV_NMEA"; # tee as passthrough
+	CMD_CONV_GPX="gpsbabel -i nmea -f - -o gpx -F - " && vbm "STATUS:Set CMD_CONV_GPX to:$CMD_CONV_GPX"; # convert NMEA to GPX
+	CMD_CONV_KML="gpsbabel -i nmea -f - -o kml -F - " && vbm "STATUS:Set CMD_CONV_KML to:$CMD_CONV_KML"; # convert NMEA to KML
+	# Fill Bash variable buffer
+	bufferBash="$(timeout "$BUFFER_TTL""s" gpspipe -r)" && vbm "STATUS:Successfully filled bufferBash variable with gpspipe data."; # Record gpspipe nmea data to buffer for bufferTTL seconds
+	# Process bufferBash, save secured chunk set to DIR_TMP
+	vbm "STATUS:Beginning to save data to $DIR_TMP";
+	echo "$bufferBash" | $CMD_CONV_NMEA | $CMD_COMPRESS | $CMD_ENCRYPT > "$PATHOUT_NMEA" & # Create NMEA file (secured if requested)
+	echo "$bufferBash" | $CMD_CONV_GPX  | $CMD_COMPRESS | $CMD_ENCRYPT > "$PATHOUT_GPX" & # Create GPX file (secured if requested)
+	echo "$bufferBash" | $CMD_CONV_KML  | $CMD_COMPRESS | $CMD_ENCRYPT > "$PATHOUT_KML" & # Create KML file (secured if requested)
+	# Append each secured chunk in memory dir (DIR_TMP) to file on disk (PATHOUT_TAR in DIR_OUT)
+	vbm "STATUS:DIR_TMP     :$DIR_TMP";
+	vbm "STATUS:PATHOUT_TAR :$PATHOUT_TAR";
+	vbm "STATUS:PATHOUT_NMEA:$PATHOUT_NMEA";
+	vbm "STATUS:PATHOUT_NMEA:$PATHOUT_GPX";
+	vbm "STATUS:PATHOUT_NMEA:$PATHOUT_KML";
+	try tar --append --directory="$DIR_TMP" --file="$PATHOUT_TAR" "$(basename "$PATHOUT_NMEA")" && \
+	    vbm "DEBUG:Appended NMEA location data $PATHOUT_NMEA to $PATHOUT_TAR";
+	try tar --append --directory="$DIR_TMP" --file="$PATHOUT_TAR" "$(basename "$PATHOUT_GPX")" && \
+	    vbm "DEBUG:Appended GPX location data $PATHOUT_GPX to $PATHOUT_TAR";
+	try tar --append --directory="$DIR_TMP" --file="$PATHOUT_TAR" "$(basename "$PATHOUT_KML")" && \
+	    vbm "DEBUG:Appended KML location $PATHOUT_KML to $PATHOUT_TAR";
+	# Remove secured chunks from DIR_TMP
+	try rm "$PATHOUT_NMEA" "$PATHOUT_GPX" "$PATHOUT_KML";
+	# Reset buffer and filenames
+	unset bufferBash FILEOUT_BASENAME PATHOUT_NMEA PATHOUT_GPX PATHOUT_KML PATHOUT_TAR;
+	vbm "DEBUG:Completed buffer session $debugCounter ." 1>&2;
+	((debugCounter++))
+    done
+
+    # Remove DIR_TMP
+    try rm -r "$DIR_TMP";
+} # Main function.
+#===END Declare local script functions===
+#==END Define script parameters==
+
+
+#==BEGIN Perform work and exit==
+main "$@" # Run main function.
+exit 0;
+#==END Perform work and exit==