| 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: 1.0.6 |
| 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" $HOME/archive.tar /tmp "gpg --decrypt" & |
| 22 | # Depends: bash 5, tar 1, yell() |
| 23 | # Ref/Attrib: Using 'eval' to construct command strings https://askubuntu.com/a/476533 |
| 24 | |
| 25 | local fn fileName tarPath tmpDir cmd0 cmd1 cmd2 cmd3 cmd4 |
| 26 | |
| 27 | # Save function name |
| 28 | fn="${FUNCNAME[0]}"; |
| 29 | #yell "DEBUG:STATUS:$fn:Finished appendArgTar()." |
| 30 | |
| 31 | # Set file name |
| 32 | if ! [ -z "$2" ]; then fileName="$2"; else yell "ERROR:$fn:Not enough arguments."; exit 1; fi |
| 33 | |
| 34 | # Check tar path is a file |
| 35 | if [ -f "$3" ]; then tarPath="$3"; else yell "ERROR:$fn:Tar archive arg not a file."; exit 1; fi |
| 36 | |
| 37 | # Check temp dir arg |
| 38 | if ! [ -z "$4" ]; then tmpDir="$4"; else yell "ERROR:$fn:No temporary working dir set."; exit 1; fi |
| 39 | |
| 40 | # Set command strings |
| 41 | if ! [ -z "$5" ]; then cmd1="$5"; else cmd1="cat "; fi # command string 1 |
| 42 | if ! [ -z "$6" ]; then cmd2="$6"; else cmd2="cat "; fi # command string 2 |
| 43 | if ! [ -z "$7" ]; then cmd3="$7"; else cmd3="cat "; fi # command string 3 |
| 44 | if ! [ -z "$8" ]; then cmd4="$8"; else cmd4="cat "; fi # command string 4 |
| 45 | |
| 46 | # Input command |
| 47 | cmd0="echo \"\$1\"" |
| 48 | |
| 49 | # # Debug |
| 50 | # yell "DEBUG:STATUS:$fn:cmd0:$cmd0" |
| 51 | # yell "DEBUG:STATUS:$fn:cmd1:$cmd1" |
| 52 | # yell "DEBUG:STATUS:$fn:cmd2:$cmd2" |
| 53 | # yell "DEBUG:STATUS:$fn:cmd3:$cmd3" |
| 54 | # yell "DEBUG:STATUS:$fn:cmd4:$cmd4" |
| 55 | # yell "DEBUG:STATUS:$fn:fileName:$fileName" |
| 56 | # yell "DEBUG:STATUS:$fn:tarPath:$tarPath" |
| 57 | # yell "DEBUG:STATUS:$fn:tmpDir:$tmpDir" |
| 58 | |
| 59 | # Write to temporary working dir |
| 60 | eval "$cmd0 | $cmd1 | $cmd2 | $cmd3 | $cmd4" > "$tmpDir"/"$fileName"; |
| 61 | |
| 62 | # Append to tar |
| 63 | try tar --append --directory="$tmpDir" --file="$tarPath" "$fileName"; |
| 64 | #yell "DEBUG:STATUS:$fn:Finished appendArgTar()." |
| 65 | } # Append Bash var to file appended to Tar archive |
| 66 | |
| 67 | #==BEGIN sample code== |
| 68 | myTar="/tmp/$(date +%s).tar"; |
| 69 | myTmpDir="/dev/shm" |
| 70 | try tar --create --file="$myTar" --files-from=/dev/null ; |
| 71 | myVar="how are you doing?" |
| 72 | appendArgTar "$myVar" "$(date +%s)..LOUD_insidetar" "$myTar" "$myTmpDir" "tee /tmp/$(date +%s)..outsidetar " "tr '[:lower:]' '[:upper:]'" && \ |
| 73 | echo "Created $myTar using $myTmpDir as temp working dir." |
| 74 | #==END sample code== |
| 75 | |
| 76 | # Author: Steven Baltakatei Sandoval |
| 77 | # License: GPLv3+ |