| | 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 $*"; } |
| | 8 | appendArgTar(){ |
| | 9 | # Desc: Writes first argument to temporary file with arguments as options, then appends file to tar |
| | 10 | # Usage: appendArgTar "$(echo "Data to be written.")" [name of file to be inserted] [tar path] [temp dir] ([cmd1] [cmd2] [cmd3] [cmd4]...) |
| | 11 | # Version: 1.0.4 |
| | 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" $HOME/archive.tar /tmp "gpg --decrypt" & |
| | 22 | # Depends: bash 5 |
| | 23 | # Ref/Attrib: Using 'eval' to construct command strings https://askubuntu.com/a/476533 |
| | 24 | |
| | 25 | # Save function name |
| | 26 | local FN="${FUNCNAME[0]}"; |
| | 27 | #yell "DEBUG:STATUS:$FN:Finished appendArgTar()." |
| | 28 | |
| | 29 | # Set file name |
| | 30 | if ! [ -z "$2" ]; then FILENAME="$2"; else yell "ERROR:$FN:Not enough arguments."; exit 1; fi |
| | 31 | |
| | 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 |
| | 34 | |
| | 35 | # Check temp dir arg |
| | 36 | if ! [ -z "$4" ]; then TMP_DIR="$4"; else yell "ERROR:$FN:No temporary working dir set."; exit 1; fi |
| | 37 | |
| | 38 | # Set command strings |
| | 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="$8"; else CMD4="tee /dev/null "; fi # command string 4 |
| | 43 | |
| | 44 | # Input command |
| | 45 | CMD0="echo \"\$1\"" |
| | 46 | |
| | 47 | # # Debug |
| | 48 | # yell "DEBUG:STATUS:$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:$TMP_DIR" |
| | 56 | |
| | 57 | # Write to temporary working dir |
| | 58 | eval "$CMD0 | $CMD1 | $CMD2 | $CMD3 | $CMD4" > "$TMP_DIR"/"$FILENAME"; |
| | 59 | |
| | 60 | # Append to tar |
| | 61 | try tar --append --directory="$TMP_DIR" --file="$TAR_PATH" "$FILENAME"; |
| | 62 | #yell "DEBUG:STATUS:$FN:Finished appendArgTar()." |
| | 63 | } # Append Bash var to file appended to Tar archive |
| | 64 | |
| | 65 | #==BEGIN sample code== |
| | 66 | myTar="/tmp/$(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:]'" |
| | 70 | #==END sample code== |
| | 71 | |
| | 72 | # Author: Steven Baltakatei Sandoval |
| | 73 | # License: GPLv3+ |
projects / BK-2020-03.git / blame_incremental