unitproc/bktemp-appendArgTar

   1 #!/bin/bash
   2
   3 # Desc: Template function to write data supplied as argument
   4
   5 yell() { echo "$0: $*" >&2; } # Yell, Die, Try Three-Fingered Claw technique; # Ref/Attrib: https://stackoverflow.com/a/25515370
   6 die() { yell "$*"; exit 111; }
   7 try() { "$@" || die "cannot $*"; }
   8 appendArgTar(){
   9     # Desc: Writes first argument to temporary file with arguments as options, then appends file to tar
  10     # Usage: writeArg "$(echo "Data to be written.")" [name of file to be inserted] [tar path] [temp dir] ([cmd1] [cmd2] [cmd3] [cmd4]...)
  11     # Input: arg1: data to be written
  12     #        arg2: file name of file to be inserted into tar
  13     #        arg3: tar archive path (must exist first)
  14     #        arg4: temporary working dir
  15     #        arg5+: command strings (ex: "gpsbabel -i nmea -f - -o kml -F - ")
  16     # Output: file written to disk
  17     # Example: decrypt multiple large files in parallel
  18     #          appendArgTar "$(cat /tmp/largefile1.gpg)" "largefile1" $HOME/archive.tar /tmp "gpg --decrypt" &
  19     #          appendArgTar "$(cat /tmp/largefile2.gpg)" "largefile2" $HOME/archive.tar /tmp "gpg --decrypt" &
  20     #          appendArgTar "$(cat /tmp/largefile3.gpg)" "largefile3" $HOME/archive.tar /tmp "gpg --decrypt" &
  21
  22     # Depends: bash 5
  23
  24     # Set file name
  25     if ! [ -z "$2" ]; then FILENAME="$2"; else yell "ERROR:Not enough arguments."; exit 1; fi
  26
  27     # Check tar path is a file
  28     if [ -f "$3" ]; then TAR_PATH="$3"; else yell "ERROR:Tar archive arg not a file."; exit 1; fi
  29
  30     # Check temp dir arg
  31     if ! [ -z "$4" ]; then TMP_DIR="$3"; else yell "ERROR:No temporary working dir set."; exit 1; fi
  32
  33     # Set command strings
  34     if ! [ -z "$5" ]; then CMD1="$5"; else CMD1="tee /dev/null "; fi # command string 1
  35     if ! [ -z "$6" ]; then CMD2="$6"; else CMD2="tee /dev/null "; fi # command string 2
  36     if ! [ -z "$7" ]; then CMD3="$7"; else CMD3="tee /dev/null "; fi # command string 3
  37     if ! [ -z "$8" ]; then CMD4="$8"; else CMD4="tee /dev/null "; fi # command string 4
  38
  39     # Debug
  40     yell "CMD1:$CMD1"
  41     yell "CMD2:$CMD2"
  42     yell "CMD3:$CMD3"
  43     yell "CMD4:$CMD4"
  44     # Write to temporary working dir
  45     echo "$1" | $CMD1 | $CMD2 | $CMD3 | $CMD4 > "$TMP_DIR"/"$FILENAME";
  46
  47     # Append to tar
  48     try tar --append --directory="$TMP_DIR" --file="$TAR_PATH" "$FILENAME";
  49
  50 } # Append Bash var to file appended to Tar archive
  51
  52 #==BEGIN sample code==
  53 myFile="/tmp/$(date +%s)..original"
  54 echo "how are you doing?" > "$myFile"
  55 myVAR="$(cat $myFile)"
  56 writeArg "$myVAR" "$myFile..LOUD_CHILD" "tee /tmp/cloneityclone " "tr '[:lower:]' '[:upper:]'"
  57 #==END sample code==
  58
  59 # Author: Steven Baltakatei Sandoval
  60 # License: GPLv3+