X-Git-Url: https://zdv2.bktei.com/gitweb/EVA-2020-02.git/blobdiff_plain/286d9825e57eb5350a438f22403308f5fb43494d..f5def0c431bb325b47d1a3b8dd062115d8977eb8:/exec/bkgpslog

diff --git a/exec/bkgpslog b/exec/bkgpslog
index 7e6bf27..9289064 100755
--- a/exec/bkgpslog
+++ b/exec/bkgpslog
@@ -2,14 +2,20 @@
 
 # Desc: Records gps data until midnight
 # Author: Steven Baltakatei Sandoval; License: GPLv3+
-# Usage: bkgpslog --output [output dir]
+# Usage: bkgpslog -o [output dir]
 
 #==BEGIN Define script parameters==
-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.
+## 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
+
+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=$(hostname);     # Save hostname of system running this script.
+SCRIPT_VERSION="bkgpslog 0.2.1"; # Define version of script.
+SCRIPT_NAME="$(basename "$0")";  # Define basename of script file.
 
 declare -Ag appRollCall # Associative array for storing app status
 declare -Ag fileRollCall # Associative array for storing file status
@@ -17,6 +23,9 @@ 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'
@@ -146,7 +155,8 @@ showUsage() {
     echoerr "            Encrypt output."
     echoerr
     echoerr "    -r, --recipient [ pubkey string ]"
-    echoerr "            Specify recipient."
+    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."
@@ -154,6 +164,13 @@ showUsage() {
     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 \\"
@@ -193,53 +210,100 @@ processArguments() {
 	    -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 DIROUT="$2"; vbm "DEBUG:DIROUT:$DIROUT"; shift; fi ;; # Define output directory.
+	    -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 "pubkey added:""$2"; shift;;
+		recPubKeys+=("$2"); vbm "STATUS:pubkey added:""$2"; shift;;
 	    -c | --compress) OPTION_COMPRESS="true"; vbm "DEBUG:Compressed output mode enabled.";;
-	    *) echoerr "ERROR: Unrecognized argument."; exit 1;; # Handle unrecognized options.
+	    -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
+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
+    
+    # Validate TZ string
+    if ! [[ -f "$tzDir"/"$ARG1" ]]; then
+	yell "ERROR:Invalid time zone argument.";
+	return 2;
+    else
+    # Export ARG1 as TZ environment variable
+	TZ="$ARG1" && export TZ && returnState="true";
+    fi
+
+    # Determine function return code
+    if [ "$returnState" = "true" ]; then
+	return 0;
+    fi
+} # Exports TZ environment variable
 timeUntilNextDay(){
     # Desc: Report seconds until next day.
+    # Version: 1.0.0
     # 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="$(timeUntilNextDay)"; then yell "ERROR in if statement"; exit 1; fi
+    # Depends: date 8, echo 8, yell, try
+    
     local returnState TIME_CURRENT TIME_NEXT_DAY SECONDS_UNTIL_NEXT_DAY
+
     TIME_CURRENT="$(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";
+	returnState="warning_zero";
 	yell "WARNING:Reported time until next day exactly zero.";
     elif [[ "$SECONDS_UNTIL_NEXT_DAY" -lt 0 ]]; then
-	returnState="WARNING_NEGATIVE";
+	returnState="warning_negative";
 	yell "WARNING:Reported time until next day is negative.";
     fi
 
     try echo "$SECONDS_UNTIL_NEXT_DAY"; # Report
     
-    #===Determine function return code===
+    # Determine function return code
     if [[ "$returnState" = "true" ]]; then
 	return 0;
-    elif [[ "$returnState" = "WARNING_ZERO" ]]; then
+    elif [[ "$returnState" = "warning_zero" ]]; then
 	return 1;
-    elif [[ "$returnState" = "WARNING_NEGATIVE" ]]; then
+    elif [[ "$returnState" = "warning_negative" ]]; then
 	return 2;
     fi
 } # Report seconds until next day
 timeUntilNextHour(){
     # Desc: Report seconds until next hour
+    # Version 1.0.0
     # Output: stdout: integer seconds until next hour
     # Output: exit code 0 if stdout > 0; 1 if stdout = 0; 2 if stdout < 0
     # Usage: timeUntilNextHour
     # Usage: if ! myTTL="$(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 "$TIME_CURRENT next hour" --iso-8601=hours)"; # Produce `date`-parsable current time stamp with resolution of 1 second.
@@ -247,21 +311,21 @@ timeUntilNextHour(){
     if [[ "$SECONDS_UNTIL_NEXT_HOUR" -gt 0 ]]; then
 	returnState="true";
     elif [[ "$SECONDS_UNTIL_NEXT_HOUR" -eq 0 ]]; then
-	returnState="WARNING_ZERO";
+	returnState="warning_zero";
 	yell "WARNING:Reported time until next hour exactly zero.";
     elif [[ "$SECONDS_UNTIL_NEXT_HOUR" -lt 0 ]]; then
-	returnState="WARNING_NEGATIVE";
+	returnState="warning_negative";
 	yell "WARNING:Reported time until next hour is negative.";
     fi
 
     try echo "$SECONDS_UNTIL_NEXT_HOUR"; # Report
     
-    #===Determine function return code===
+    # Determine function return code
     if [[ "$returnState" = "true" ]]; then
 	return 0;
-    elif [[ "$returnState" = "WARNING_ZERO" ]]; then
+    elif [[ "$returnState" = "warning_zero" ]]; then
 	return 1;
-    elif [[ "$returnState" = "WARNING_NEGATIVE" ]]; then
+    elif [[ "$returnState" = "warning_negative" ]]; then
 	return 2;
     fi
 } # Report seconds until next hour
@@ -273,9 +337,448 @@ dateTimeShort(){
     TIME_CURRENT="$(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 "$TIME_CURRENT_SHORT";
-} # Get date&time without separators
+} # Get YYYYmmddTHHMMSS±zzzz
+dateShort(){
+    # Desc: Date without separators (YYYYmmdd)
+    # Usage: dateShort
+    # Output: stdout: date (ISO-8601, no separators)
+    local TIME_CURRENT DATE_CURRENT_SHORT
+    TIME_CURRENT="$(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])
+    # Version: 1.0.1
+    # 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), yell, 
+    local returnState ARG1 ARG2 remainder precision witherPrecision
+    local fullYears fullMonths fullDays fullHours fullMinutes fullSeconds
+    local displayYears displayMonths displayDays displayHours displayMinutes displaySeconds
+    local hasYears hasMonths hasDays hasHours hasMinutes hasSeconds
+    
+    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
+   	    :
+	else
+	    yell "ERROR:ARG1 not a digit.";
+	    returnState="ERROR_INPUT";
+	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:]]+$ ]] && [[ "$ARG2" -gt 0 ]]; then
+	precision="$ARG2";
+	else
+	    yell "ERROR:ARG2 not a positive integer. (is $ARG2 ). Leaving early.";
+	    returnState="ERROR_INPUT";
+	fi;
+    else
+	:
+    fi;
+    
+    remainder="$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$fullSeconds"S"; fi
+
+    ## Output duration string to stdout
+    if [[ "$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).
+checkMakeTar() {
+    # Desc: Checks that a valid tar archive exists, creates one otherwise
+    # Usage: checkMakeTar [ path ]
+    # Version: 1.0.1
+    # Input: arg1: path of tar archive
+    # Output: exit code 0 : tar readable
+    #         exit code 1 : tar missing; created
+    #         exit code 2 : tar not readable; moved; replaced
+    # Depends: try, tar, date
+    local PATH_TAR returnFlag0 returnFlag1 returnFlag2
+    PATH_TAR="$1"
+
+    # Check if file is a valid tar archive
+    if tar --list --file="$PATH_TAR" 1>/dev/null 2>&1; then
+	## T1: return success
+	returnFlag0="tar valid";
+    else
+	## F1: Check if file exists
+	if [[ -f "$PATH_TAR" ]]; then
+	    ### T: Rename file
+	    try mv "$PATH_TAR" "$PATH_TAR""--broken--""$(date +%Y%m%dT%H%M%S)" && \
+		returnFlag1="tar moved";
+	else
+	    ### F: -
+	    :
+	fi
+	## F2: Create tar archive, return 0
+	try tar --create --file="$PATH_TAR" --files-from=/dev/null && \
+	    returnFlag2="tar created";
+    fi
+    
+    # Determine function return code
+    if [[ "$returnFlag0" = "tar valid" ]]; then
+	return 0;
+    elif [[ "$returnFlag2" = "tar created" ]] && ! [[ "$returnFlag1" = "tar moved" ]]; then
+	return 1; # tar missing so created
+    elif [[ "$returnFlag2" = "tar created" ]] && [[ "$returnFlag1" = "tar moved" ]]; then
+	return 2; # tar not readable so moved; replaced
+    fi
+} # checks if arg1 is tar; creates one otherwise
+appendArgTar(){
+    # Desc: Writes first argument to temporary file with arguments as options, then appends file to tar
+    # Usage: writeArg "$(echo "Data to be written.")" [name of file to be inserted] [tar path] [temp dir] ([cmd1] [cmd2] [cmd3] [cmd4]...)
+    # Input: arg1: data to be written
+    #        arg2: file name of file to be inserted into tar
+    #        arg3: tar archive path (must exist first)
+    #        arg4: temporary working dir
+    #        arg5+: command strings (ex: "gpsbabel -i nmea -f - -o kml -F - ")
+    # Output: file written to disk
+    # Example: decrypt multiple large files in parallel
+    #          appendArgTar "$(cat /tmp/largefile1.gpg)" "largefile1" $HOME/archive.tar /tmp "gpg --decrypt" &
+    #          appendArgTar "$(cat /tmp/largefile2.gpg)" "largefile2" $HOME/archive.tar /tmp "gpg --decrypt" &
+    #          appendArgTar "$(cat /tmp/largefile3.gpg)" "largefile3" $HOME/archive.tar /tmp "gpg --decrypt" &
+    # Depends: bash 5
+
+    # Save function name
+    local FN="${FUNCNAME[0]}"
+    yell "DEBUG:STATUS:$FN:Finished appendArgTar()."
+    
+    # Set file name
+    if ! [ -z "$2" ]; then FILENAME="$2"; else yell "ERROR:$FN:Not enough arguments."; exit 1; fi
+    
+    # Check tar path is a file
+    if [ -f "$3" ]; then TAR_PATH="$3"; else yell "ERROR:$FN:Tar archive arg not a file."; exit 1; fi
+	
+    # Check temp dir arg
+    if ! [ -z "$4" ]; then TMP_DIR="$4"; else yell "ERROR:$FN:No temporary working dir set."; exit 1; fi
+    
+    # Set command strings
+    if ! [ -z "$5" ]; then CMD1="$5"; else CMD1="tee /dev/null "; fi # command string 1
+    if ! [ -z "$6" ]; then CMD2="$6"; else CMD2="tee /dev/null "; fi # command string 2
+    if ! [ -z "$7" ]; then CMD3="$7"; else CMD3="tee /dev/null "; fi # command string 3
+    if ! [ -z "$8" ]; then CMD4="$8"; else CMD4="tee /dev/null "; fi # command string 4
+
+    # Debug
+    yell "STATUS:$FN:CMD1:$CMD1"
+    yell "STATUS:$FN:CMD2:$CMD2"
+    yell "STATUS:$FN:CMD3:$CMD3"
+    yell "STATUS:$FN:CMD4:$CMD4"
+    yell "STATUS:$FN:FILENAME:$FILENAME"
+    yell "STATUS:$FN:TAR_PATH:$TAR_PATH"
+    yell "STATUS:$FN:TMP_DIR:$TMP_DIR"
+    # Write to temporary working dir
+    echo "$1" | $CMD1 | $CMD2 | $CMD3 | $CMD4 > "$TMP_DIR"/"$FILENAME";
+
+    # Append to tar
+    try tar --append --directory="$TMP_DIR" --file="$TAR_PATH" "$FILENAME";
+    yell "DEBUG:STATUS:$FN:Finished appendArgTar()."
+} # Append Bash var to file appended to Tar archive
+magicWriteVersion() {
+    # Desc: Appends time-stamped VERSION to PATHOUT_TAR
+    # Usage: magicWriteVersion
+    # Input: CONTENT_VERSION, FILEOUT_VERSION, PATHOUT_TAR, DIR_TMP
+    # Depends: dateTimeShort, appendArgTar
+    local CONTENT_VERSION
+    
+    # Generate VERSION file in BashVar
+    FILEOUT_VERSION="$(dateTimeShort)..VERSION";
+    CONTENT_VERSION="VERSION=$SCRIPT_VERSION";
+    CONTENT_VERSION="$CONTENT_VERSION""\n""SCRIPT_NAME=SCRIPT_NAME";
+    CONTENT_VERSION="$CONTENT_VERSION""\n""DATE=$(date --iso-8601=seconds)";
+    CONTENT_VERSION="$CONTENT_VERSION""\n""HOSTNAME=$SCRIPT_HOSTNAME";
+    CONTENT_VERSION="$(echo -e "$CONTENT_VERSION")"
+
+    # Create BashVar as file FILEOUT_VERSION and write-append to PATHOUT_TAR
+    appendArgTar "$CONTENT_VERSION" "$FILEOUT_VERSION" "$PATHOUT_TAR" "$DIR_TMP";
+} # bkgpslog: write version data to PATHOUT_TAR via appendArgTar()
+magicWriteBuffer() {
+    # Desc: bkgpslog-specific meta function for writing data to DIR_TMP then appending each file to PATHOUT_TAR
+    # Inputs: PATHOUT_TAR FILEOUT_{NMEA,GPX,KML} CMD_CONV_{NMEA,GPX,KML} CMD_{COMPRESS,ENCRYPT} DIR_TMP
+    # Depends: yell, try, vbm, appendArgTar, tar
+    local FN="${FUNCNAME[0]}";
+    wait; # Wait to avoid collision with older magicWriteBuffer() instances (see https://www.tldp.org/LDP/abs/html/x9644.html )
+    vbm "DEBUG:STATUS:$FN:Started magicWriteBuffer().";
+
+    # Validate PATHOUT_TAR as tar.
+    checkMakeTar "$PATHOUT_TAR";
+    ## Add VERSION file if checkMakeTar had to create a tar (exited 1) or replace one (exited 2)
+    if [[ $? -eq 1 ]] || [[ $? -eq 2 ]]; then magicWriteVersion; fi
+
+    # Write bufferBash to PATHOUT_TAR
+    appendArgTar "$bufferBash" "$FILEOUT_NMEA" "$PATHOUT_TAR" "$DIR_TMP" "$CMD_CONV_NMEA" "$CMD_COMPRESS" "$CMD_ENCRYPT"; # Write NMEA data
+    appendArgTar "$bufferBash" "$FILEOUT_GPX" "$PATHOUT_TAR" "$DIR_TMP" "$CMD_CONV_GPX" "$CMD_COMPRESS" "$CMD_ENCRYPT"; # Write GPX file
+    appendArgTar "$bufferBash" "$FILEOUT_KML" "$PATHOUT_TAR" "$DIR_TMP" "$CMD_CONV_KML" "$CMD_COMPRESS" "$CMD_ENCRYPT"; # Write KML file
+    # Remove secured chunks from DIR_TMP
+    try rm "$PATHOUT_NMEA" "$PATHOUT_GPX" "$PATHOUT_KML";
+    yell "DEBUG:STATUS:$FN:Finished magicWriteBuffer().";
+} # bkgpslog write function
+
 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:$OPTION_TMPDIR";
+	    exit 1;
+	fi
+    fi
+
+    ## Set DIR_TMP_PARENT to default or fallback otherwise
+    if [[ -d "$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().
+    
+    # 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
@@ -283,7 +786,7 @@ main() {
 		if echo "butts" | age -a -r "$pubkey" 1>/dev/null; then
 		    # Form age recipient string
 		    recipients="$recipients""-r $pubkey ";
-		    vbm "Added pubkey for forming age recipient string:""$pubkey";
+		    vbm "STATUS:Added pubkey for forming age recipient string:""$pubkey";
 		    vbm "DEBUG:recipients:""$recipients";
 		else
 		    yell "ERROR:Exit code ""$?"". Invalid recipient pubkey string. Exiting."; exit 1;
@@ -291,74 +794,95 @@ main() {
 	    done
 	    vbm "DEBUG:Finished processing recPubKeys array";
 	    # Form age command string
-	    CMD_ENCRYPT=" | age ""$recipients ";
+	    CMD_ENCRYPT="age ""$recipients ";
 	    CMD_ENCRYPT_SUFFIX=".age";
 	else
 	    yell "ERROR:Encryption enabled but \"age\" not found. Exiting."; exit 1;
 	fi
     else
-	CMD_ENCRYPT="";
+	CMD_ENCRYPT="tee /dev/null ";
 	CMD_ENCRYPT_SUFFIX="";
 	vbm "DEBUG:Encryption not enabled."
     fi
-
     if [[ "$OPTION_COMPRESS" = "true" ]]; then # Check if compression option active
 	if checkapp gzip; then # Check if gzip available
-	    CMD_COMPRESS=" | gzip ";
+	    CMD_COMPRESS="gzip ";
 	    CMD_COMPRESS_SUFFIX=".gz";
 	else
 	    yell "ERROR:Compression enabled but \"gzip\" not found. Exiting."; exit 1;
 	fi
     else
-	CMD_COMPRESS="";
+	CMD_COMPRESS="tee /dev/null ";
 	CMD_COMPRESS_SUFFIX="";
-	vbm "DEBUG:Compression not enabled."
+	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"; # seconds until next new SCRIPT_TTL (ex: "day" or "hour")
+
+    # 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:$PATHOUT_TAR";
+    ## Check that PATHOUT_TAR is a tar. Rename old and create empty one otherwise.
+    checkMakeTar "$PATHOUT_TAR" && vbm "DEBUG:Confirmed or Created to be a tar:$PATHOUT_TAR";
+    ## Append VERSION file to PATHOUT_TAR
+    magicWriteVersion;
     
-    
-    if checkapp gpspipe && checkdir "$DIROUT"; then
-	
-	# # Set script lifespan to end at start of next day
-	# if ! scriptTTL="$(timeUntilNextDay)"; then
-	#     if [[ "$scriptTTL" -eq 0 ]]; then
-	# 	((scriptTTL++)); # Add 1 because 0 would cause 'timeout' to never timeout.
-	#     else
-	# 	yell "ERROR: timeUntilNextDay exit code $?"; exit 1;
-	#     fi;
-	# fi;
+    # Record gps data until script lifespan ends
+    declare debugCounter; debugCounter="0"; # set debug counter
+    while [[ "$SECONDS" -lt "$scriptTTL" ]]; do
+	timeBufferStart="$(dateTimeShort)"; # Note start time
+	# Determine file paths (time is start of buffer period)
+	FILEOUT_BASENAME="$timeBufferStart""--""$bufferTTL_STR""..""$SCRIPT_HOSTNAME""_location" && vbm "STATUS:Set FILEOUT_BASENAME to:$FILEOUT_BASENAME";
+	## Files saved to DIR_TMP
+	FILEOUT_NMEA="$FILEOUT_BASENAME".nmea"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" && vbm "STATUS:Set FILEOUT_NMEA to:$FILEOUT_NMEA";
+	FILEOUT_GPX="$FILEOUT_BASENAME".gpx"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" && vbm "STATUS:Set FILEOUT_GPX to:$FILEOUT_GPX";
+	FILEOUT_KML="$FILEOUT_BASENAME".kml"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" && vbm "STATUS:Set FILEOUT_KML to:$FILEOUT_KML";
+	PATHOUT_NMEA="$DIR_TMP"/"$FILEOUT_NMEA" && vbm "STATUS:Set PATHOUT_NMEA to:$PATHOUT_NMEA";
+	PATHOUT_GPX="$DIR_TMP"/"$FILEOUT_GPX" && vbm "STATUS:Set PATHOUT_GPX to:$PATHOUT_GPX";
+	PATHOUT_KML="$DIR_TMP"/"$FILEOUT_KML" && 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 $DIR_TMP";
+	magicWriteBuffer &
+	# Append each secured chunk in memory dir (DIR_TMP) to file on disk (PATHOUT_TAR in DIR_OUT)
+	vbm "STATUS:DIR_TMP     :$DIR_TMP";
+	vbm "STATUS:PATHOUT_TAR :$PATHOUT_TAR";
+	vbm "STATUS:PATHOUT_NMEA:$PATHOUT_NMEA";
+	vbm "STATUS:PATHOUT_GPX:$PATHOUT_GPX";
+	vbm "STATUS:PATHOUT_KML:$PATHOUT_KML";
 
-	# 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 $?"; exit 1;
-	    fi;
-	fi;
-        
-	# Determine buffer lifespan
-	bufferTTL="60";
-
-	# Record gps data until script lifespan ends
-	declare debugCounter; debugCounter="0"
-	while [[ "$SECONDS" -lt "$scriptTTL" ]]; do
-	    ((debugCounter++))
-      	    # Determine output file paths (time is start of buffer period)
-	    FILEOUT_BASENAME="$(dateTimeShort)""--P""$bufferTTL""S..""$SCRIPT_HOSTNAME""_location" ; # ISO-8601 YYYYmmddTHHMMSS+zzP[$bufferTTL]S
-	    FILEOUT_NMEA="$FILEOUT_BASENAME".nmea"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" ;
-	    FILEOUT_GPX="$FILEOUT_BASENAME".gpx"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" ;
-	    FILEOUT_KML="$FILEOUT_BASENAME".kml"$CMD_COMPRESS_SUFFIX""$CMD_ENCRYPT_SUFFIX" ;
-	    # Fill buffer
-	    buffer="$(timeout "$bufferTTL""s" gpspipe -r)"; # Record gpspipe nmea data to buffer for bufferTTL seconds
-	    # Process and save buffers
-	    echo "$buffer"                                     "$CMD_COMPRESS" "$CMD_ENCRYPT" > "$DIROUT"/"$FILEOUT_NMEA" & # Save NMEA format
-	    echo "$buffer" | gpsbabel -i nmea -f - -o gpx -F - "$CMD_COMPRESS" "$CMD_ENCRYPT" > "$DIROUT"/"$FILEOUT_GPX" & # Save GPX format
-	    echo "$buffer" | gpsbabel -i nmea -f - -o kml -F - "$CMD_COMPRESS" "$CMD_ENCRYPT" > "$DIROUT"/"$FILEOUT_KML" & # Save KML format
-	    vbm "DEBUG:Completed buffer session $debugCounter ." 1>&2;
-	    # Reset buffer and filenames
-	    unset buffer FILEOUT_BASENAME FILEOUT_NMEA FILEOUT_GPX FILEOUT_KML;
-	done
-    fi
+	# Reset buffer and filenames
+	unset bufferBash FILEOUT_BASENAME PATHOUT_NMEA PATHOUT_GPX PATHOUT_KML PATHOUT_TAR timeBufferStart;
+	vbm "DEBUG:Completed buffer session $debugCounter ." 1>&2;
+	((debugCounter++))
+    done
+
+    # Remove DIR_TMP
+    try rm -r "$DIR_TMP";
+
+    vbm "STATUS:Main function finished.";
 } # Main function.
 #===END Declare local script functions===
 #==END Define script parameters==
@@ -368,7 +892,3 @@ main() {
 main "$@" # Run main function.
 exit 0;
 #==END Perform work and exit==
-
-
-    
-    #gpspipe -r -d -l -o "$DIROUT1"/"$FILEOUT1" ;