3 # Desc: Template function to write data supplied as argument
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 $*"; }
9 # Desc: Writes first argument to temporary file with arguments as options, then appends file to tar
10 # Usage: appendArgTar "$(echo "Data to be written.")" [name of file to be inserted] [tar path] [temp dir] ([cmd1] [cmd2] [cmd3] [cmd4]...)
12 # Input: arg1: data to be written
13 # arg2: file name of file to be inserted into tar
14 # arg3: tar archive path (must exist first)
15 # arg4: temporary working dir
16 # arg5+: command strings (ex: "gpsbabel -i nmea -f - -o kml -F - ")
17 # Output: file written to disk
18 # Example: decrypt multiple large files in parallel
19 # appendArgTar "$(cat /tmp/largefile1.gpg)" "largefile1" $HOME/archive.tar /tmp "gpg --decrypt" &
20 # appendArgTar "$(cat /tmp/largefile2.gpg)" "largefile2" $HOME/archive.tar /tmp "gpg --decrypt" &
21 # appendArgTar "$(cat /tmp/largefile3.gpg)" "largefile3" $HOME/archive.tar /tmp "gpg --decrypt" &
23 # Ref/Attrib: Using 'eval' to construct command strings https://askubuntu.com/a/476533
26 local FN
="${FUNCNAME[0]}";
27 #yell "DEBUG:STATUS:$FN:Finished appendArgTar()."
30 if ! [ -z "$2" ]; then FILENAME
="$2"; else yell
"ERROR:$FN:Not enough arguments."; exit 1; fi
32 # Check tar path is a file
33 if [ -f "$3" ]; then TAR_PATH
="$3"; else yell
"ERROR:$FN:Tar archive arg not a file."; exit 1; fi
36 if ! [ -z "$4" ]; then TMP_DIR
="$4"; else yell
"ERROR:$FN:No temporary working dir set."; exit 1; fi
39 if ! [ -z "$5" ]; then CMD1
="$5"; else CMD1
="tee /dev/null "; fi # command string 1
40 if ! [ -z "$6" ]; then CMD2
="$6"; else CMD2
="tee /dev/null "; fi # command string 2
41 if ! [ -z "$7" ]; then CMD3
="$7"; else CMD3
="tee /dev/null "; fi # command string 3
42 if ! [ -z "$8" ]; then CMD4
="$8"; else CMD4
="tee /dev/null "; fi # command string 4
48 # yell "DEBUG:STATUS:$FN:CMD0:$CMD0"
49 # yell "DEBUG:STATUS:$FN:CMD1:$CMD1"
50 # yell "DEBUG:STATUS:$FN:CMD2:$CMD2"
51 # yell "DEBUG:STATUS:$FN:CMD3:$CMD3"
52 # yell "DEBUG:STATUS:$FN:CMD4:$CMD4"
53 # yell "DEBUG:STATUS:$FN:FILENAME:$FILENAME"
54 # yell "DEBUG:STATUS:$FN:TAR_PATH:$TAR_PATH"
55 # yell "DEBUG:STATUS:$FN:TMP_DIR:$TMP_DIR"
57 # Write to temporary working dir
58 eval "$CMD0 | $CMD1 | $CMD2 | $CMD3 | $CMD4" > "$TMP_DIR"/"$FILENAME";
61 try
tar --append --directory="$TMP_DIR" --file="$TAR_PATH" "$FILENAME";
62 #yell "DEBUG:STATUS:$FN:Finished appendArgTar()."
63 } # Append Bash var to file appended to Tar archive
65 #==BEGIN sample code==
66 myTar
="/tmp/$(date +%s).tar";
67 try
tar --create --file="$myTar" --files-from=/dev
/null
;
68 myVar
="how are you doing?"
69 appendArgTar
"$myVar" "$(date +%s)..LOUD_insidetar" "$myTar" "/dev/shm" "tee /tmp/$(date +%s)..outsidetar " "tr '[:lower:]' '[:upper:]'"
72 # Author: Steven Baltakatei Sandoval