-* bkgpslog task list
-** DONE Add job control for short buffer length
- CLOSED: [2020-07-02 Thu 16:04]
-2020-07-02T14:56Z; bktei> File write operations were bundled into a
-magicWriteBuffer function that is called then detached from the script
-shell (job control), but the detached job is not tracked by the main
-script. A problem may arise if two instances of magicWriteBuffer
-attempt to write to the same tar simultaneously. Two instances of
-magicWriteBuffer may exist if the buffer length is low (ex: 1 second);
-the default buffer length of 60 seconds should reduce the probability
-of a collision but it should be possible for the main script to track
-the process ID of a magicWriteBuffer() as soon as it detaches and then
-checking (via ~$!~ as described [[https://bashitout.com/2013/05/18/Ampersands-on-the-command-line.html][here]]) that the process is still alive.
-2020-07-02T15:23Z; bktei> I found that the Bash ~wait~ built-in can be
-used to delay processing until a specified job completes. The ~wait~
-command will pause script execution until all backgrounded processes
-complete.
-2020-07-02T16:03Z; bktei> Added ~wait~.
-** DONE Rewrite tar initialization function
- CLOSED: [2020-07-02 Thu 17:23]
-2020-07-02T17:23Z; bktei> Simplify tar initialization function so
-VERSION file is used to test appendability of tar as well as to mark
-when a new session is started.
-** DONE Consolidate tar checking/creation into function
- CLOSED: [2020-07-02 Thu 18:33]
-2020-07-02T18:33Z; bktei> Simplify how the output tar file's existence
-is checked and its status as a valid tar file is validated. This was
-done using a new function ~checkMakeTar~.
-** DONE Add VERSION if output tar deleted between writes
-
- CLOSED: [2020-07-02 Thu 20:22]
-2020-07-02T20:21Z; bktei> Added bkgpslog-specified function
-magicWriteVersion() to be called whenever a new time-stamped ~VERSION~
-file needs to be generated and appended to the output tar file
-~PATHOUT_TAR~.
-** TODO Rewrite buffer loop to reduce lag between gpspipe runs
-2020-07-03T17:10Z; bktei> As is, there is still a 5-6 second lag
-between when ~gpspipe~ times out at the end of a buffer round and when
-~gpspipe~ is called by the subsequent buffer round. I believe this can
-be reduced by moving variable manipulations inside the
-asynchronously-executed magicWriteBuffer() function. Ideally, the
-while loop should look like:
-
-#+BEGIN_EXAMPLE
-while( $SECONDS < $SCRIPT_TTL); do
- gpspipe-r > "$DIR_TMP"/buffer.nmea
- writeBuffer &
-done
-#+END_EXAMPLE
-
-* bkgpslog narrative
-** Initialize environment
-*** Init variables
-**** Save timeStart (YYYYmmddTHHMMSS±zz)
-*** Define Functions
-**** Define Debugging functions
-**** Define Argument Processing function
-**** Define Main function
-** Run Main Function
-*** Process Arguments
-*** Set output encryption and compression option strings
-*** Check that critical apps and dirs are available, displag missing ones.
-*** Set lifespans of script and buffer
-*** Init temp working dir ~DIR_TMP~
-Make temporary dir in tmpfs dir: ~/dev/shm/$(nonce)..bkgpslog/~ (~DIR_TMP~)
-*** Initialize ~tar~ archive
-**** Write ~bkgpslog~ version to ~$DIR_TMP/VERSION~
-**** Create empty ~tar~ archive in ~DIR_OUT~ at ~PATHOUT_TAR~
-
-Set output file name to:
-: PATHOUT_TAR="$DIR_OUT/YYYYmmdd..hostname_location.gz.age.tar"
-Usage: ~iso8601Period $timeStart $timeEnd~
-
-**** Append ~VERSION~ file to ~PATHOUT_TAR~
-
-Append ~$DIR_TMP/VERSION~ to ~PATHOUT_TAR~ via ~tar --append~
-
-*** Read/Write Loop (Record gps data until script lifespan ends)
-**** Determine output file paths
-**** Define GPS conversion commands
-**** Fill Bash variable buffer from ~gpspipe~
-**** Process bufferBash, save secured chunk set to ~DIR_TMP~
-**** Append each secured chunk to ~PATHOUT_TAR~
-: tar --append --directory=DIR_TMP --file=PATHOUT_TAR $(basename PATHOUT_{NMEA,GPX,KML} )
-**** Remove secured chunk from ~DIR_TMP~
projects / EVA-2020-02.git / blobdiff