fix(exec/bklog):Add kill switch if `while read` returns empty buffer

[EVA-2020-02.git] / exec / bklog

diff --git a/exec/bklog b/exec/bklog
index 62c0901f9b9e099bc00ccf384bf7cc412a4f90e0..cc807a6e4f0d19b328aea786ee8f596db991c50d 100644 (file)
--- a/exec/bklog
+++ b/exec/bklog
@@ -11,8 +11,9 @@ dirTmpDefault="/dev/shm"; # Default parent of working directory
 
 # Script Metadata
 scriptName="bklog";             # Define basename of script file.
-scriptVersion="0.1.27";          # Define version of script.
-scriptURL="https://gitlab.com/baltakatei/ninfacyzga-01"; # Define wesite hosting this script.
+scriptVersion="0.1.33";         # Define version of script.
+scriptURL="https://gitlab.com/baltakatei/ninfacyzga-01"; # Define website hosting this script.
+scriptTimeStartEpoch="$(date +%s)"; # Save start time of script in epoch seconds
 scriptTimeStart="$(date +%Y%m%dT%H%M%S.%N)"; # YYYYmmddTHHMMSS.NNNNNNNNN
 scriptHostname=$(hostname);     # Save hostname of system running this script.
 PATH="$HOME/.local/bin:$PATH";  # Add "$(systemd-path user-binaries)" path in case user apps saved there
@@ -57,7 +58,7 @@ processArguments() {
            -p | --process-string) optionProcString="true" && argProcStrings+=("$2") && argProcFileExts+=("$3") && vbm "STATUS:file extension \"$3\" for output of processing string added:\"$2\""; shift; shift;;
            -l | --label) optionLabel="true" && argLabel="$2"; vbm "DEBUG :Custom label received:$argLabel"; shift;;
            -w | --store-raw) optionStoreRaw="true" && argRawFileExt="$2"; vbm "DEBUG :Raw stdin file extension received:$argRawFileExt"; shift;;
-           -W | --no-store-raw) optionNoStoreRaw="true"; vbm "DEBUG :Option selected to not store raw stdin data."; shift;;
+           -W | --no-store-raw) optionNoStoreRaw="true"; vbm "DEBUG :Option selected to not store raw stdin data.";;
            *) yell "ERROR: Unrecognized argument: $1"; yell "STATUS:All arguments:$*"; exit 1;; # Handle unrecognized options.
        esac
        shift
@@ -1177,6 +1178,21 @@ magicSetScriptTTL() {
     fi;
     vbm "STATUS:$fn:Finished magicSetScriptTTL() function.";
 } # Set scriptTTL in seconds until next (day|hour).
+magicVerboseReadout() {
+    vbm "$bufferTTL"; # Time-to-live (seconds) for each buffer round
+    vbm "$scriptTTL_TE"; # Time element at the end of which script terminates
+    vbm "$dirTmpDefault"; # Default parent of working directory
+    # Script Metadata
+    vbm "$scriptName"; # Basename of script file.
+    vbm "$scriptVersion"; # Version of script.
+    vbm "$scriptURL"; # Website hosting this script.
+    vbm "$scriptTimeStartEpoch"; # Start time of script in epoch seconds
+    vbm "$scriptTimeStart"; # YYYYmmddTHHMMSS.NNNNNNNNN
+    vbm "$scriptHostname" # Hostname of system running this script.
+    vbm "$PATH"; # PATH env. var.
+    vbm "$ageVersion"; # Version of age (encryption program)
+    vbm "$ageURL"; # Website hosting age.
+} # Display script variables
 magicWriteVersion() {
     # Desc: Appends time-stamped VERSION to pathout_tar
     # Usage: magicWriteVersion
@@ -1402,6 +1418,8 @@ main() {
     magicParseProcessStrings; # Sets arrays: procStrings, procFileExts
     ## React to "-l" (output file label) option
     magicParseLabel; # sets label (ex: "_location")
+    ## React to "-v" (verbose) option
+    magicVerboseReadout; # Display various script variables
 
     # Perform secondary setup operations
     ## Set script lifespan (scriptTTL from scriptTTL_TE)
@@ -1431,14 +1449,27 @@ main() {
     while [[ $SECONDS -lt "scriptTTL" ]]; do
        vbm "STATUS:$fn:Starting buffer round:$bufferRound";
        bufferTOD="$(( (1+bufferRound)*bufferTTL ))" && vbm "DEBUG :$fn:bufferTOD:$bufferTOD"; # Set buffer round time-of-death
-       # Note start time of data collection
-       timeBufferStartEpoch="$(date +%s)" && vbm "DEBUG :$fn:timeBufferStartEpoch:$timeBufferStartEpoch";
        # Consume stdin to fill buffer until buffer time-of-death (TOD) arrives
        while read -r -t "$bufferTTL" line && [[ $SECONDS -lt "$bufferTOD" ]]; do
            # Append line to buffer array
            buffer+=("$line");
-       done;
-       # Note end time of data collection
+       done < /dev/stdin;
+       # End script if buffer array empty (ex: EOF found in stdin)
+       if [[ ${#buffer[@]} -eq 0 ]]; then
+           yell "ERROR:$fn:Empty array:buffer:${buffer[@]}"; exit 1;
+       fi;
+       # Mark time for buffer
+       ## Initial time
+       if [[ bufferRound -gt 0 ]]; then
+           ### Usual case
+           timeBufferStartEpoch="$timeBufferEndEpoch" && vbm "DEBUG :$fn:timeBufferStartEpoch:$timeBufferStartEpoch";
+       elif [[ bufferRound -eq 0 ]]; then
+           ### Edge case: initial startup
+           timeBufferStartEpoch="$scriptTimeStartEpoch" && vbm "DEBUG :$fn:timeBufferStartEpoch:$timeBufferStartEpoch";
+       else
+           yell "ERROR:$fn:Invalid bufferRound value."; exit 1;
+       fi;
+       ## End Time
        timeBufferEndEpoch="$(date +%s)" && vbm "DEBUG :$fn:timeBufferEndEpoch:$timeBufferEndEpoch";
        # Create dir_tmp if missing
        if ! [[ -d "$dir_tmp" ]]; then