X-Git-Url: https://zdv2.bktei.com/gitweb/EVA-2020-02.git/blobdiff_plain/1b0e622772dd3a08ccce04a0fb201ec18b6a079d..2fc10824a04e0d2153705f9e9d5be33654a99493:/exec/bkgpslog

diff --git a/exec/bkgpslog b/exec/bkgpslog
index 6308e09..187e246 100755
--- a/exec/bkgpslog
+++ b/exec/bkgpslog
@@ -612,6 +612,46 @@ setScriptTTL() {
 	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 "$(echo "Data to be written.")" [name of file to be inserted] [tar path] [temp dir] ([cmd1] [cmd2] [cmd3] [cmd4]...)
@@ -663,8 +703,16 @@ appendArgTar(){
 } # Append Bash var to file appended to Tar archive
 magicWriteBuffer() {
     # Desc: bkgpslog-specific meta function for writing data to DIR_TMP then appending each file to PATHOUT_TAR
+    # Inputs: PATHOUT_TAR FILEOUT_{NMEA,GPX,KML} CMD_CONV_{NMEA,GPX,KML} CMD_{COMPRESS,ENCRYPT} DIR_TMP
+    # Depends: yell, try, vbm, appendArgTar, tar
     local FN="${FUNCNAME[0]}";
-    yell "DEBUG:STATUS:$FN:Started magicWriteBuffer().";
+    wait; # Wait to avoid collision with older magicWriteBuffer() instances (see https://www.tldp.org/LDP/abs/html/x9644.html )
+    vbm "DEBUG:STATUS:$FN:Started magicWriteBuffer().";
+
+    # Check that PATHOUT_TAR is a tar. Rename old and create empty one otherwise.
+    checkMakeTar "$PATHOUT_TAR"
+
+    # Write bufferBash to PATHOUT_TAR
     appendArgTar "$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
@@ -759,30 +807,14 @@ main() {
     ## 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
+    ## Generate VERSION file
     FILEOUT_VERSION="$(dateTimeShort)..VERSION";
     PATHOUT_VERSION="$DIR_TMP"/"$FILEOUT_VERSION";
     echo "$(dateTimeShort):$(basename "$0")"" Version:""$SCRIPT_VERSION" >> "$PATHOUT_VERSION" && vbm "DEBUG:VERSION created:$PATHOUT_VERSION";
-    ## 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.
-	FILEOUT_APPENDTEST="$(dateTimeShort)..RESUMING_LOGGING_SESSION.txt";
-	PATHOUT_APPENDTEST="$DIR_TMP"/"$FILEOUT_APPENDTEST" && \
-	    vbm "DEBUG:Set PATHOUT_APPENDTEST to:$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="$PATHOUT_TAR" "$FILEOUT_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:$PATHOUT_TAR";
-    fi	
+
+    ## Check that PATHOUT_TAR is a tar. Rename old and create empty one otherwise.
+    checkMakeTar "$PATHOUT_TAR" && vbm "DEBUG:Confirmed or Created to be a tar:$PATHOUT_TAR";
+
     ## Append VERSION file to PATHOUT_TAR
     try tar --append --directory="$DIR_TMP" --file="$PATHOUT_TAR" "$FILEOUT_VERSION" && \
 	vbm "DEBUG:VERSION added to $PATHOUT_TAR";