Commit | Line | Data |
---|---|---|
0f8ac166 SBS |
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 $*"; } | |
8 | appendArgTar(){ | |
9 | # Desc: Writes first argument to temporary file with arguments as options, then appends file to tar | |
71d6b5c9 | 10 | # Usage: appendArgTar "$(echo "Data to be written.")" [name of file to be inserted] [tar path] [temp dir] ([cmd1] [cmd2] [cmd3] [cmd4]...) |
76671929 | 11 | # Version: 1.0.4 |
0f8ac166 SBS |
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" $HOME/archive.tar /tmp "gpg --decrypt" & | |
0f8ac166 | 22 | # Depends: bash 5 |
f0531598 | 23 | # Ref/Attrib: Using 'eval' to construct command strings https://askubuntu.com/a/476533 |
0f8ac166 | 24 | |
4dad1c36 SBS |
25 | # Save function name |
26 | local FN="${FUNCNAME[0]}"; | |
27 | #yell "DEBUG:STATUS:$FN:Finished appendArgTar()." | |
28 | ||
0f8ac166 | 29 | # Set file name |
4dad1c36 | 30 | if ! [ -z "$2" ]; then FILENAME="$2"; else yell "ERROR:$FN:Not enough arguments."; exit 1; fi |
0f8ac166 SBS |
31 | |
32 | # Check tar path is a file | |
4dad1c36 | 33 | if [ -f "$3" ]; then TAR_PATH="$3"; else yell "ERROR:$FN:Tar archive arg not a file."; exit 1; fi |
0f8ac166 SBS |
34 | |
35 | # Check temp dir arg | |
4dad1c36 | 36 | if ! [ -z "$4" ]; then TMP_DIR="$4"; else yell "ERROR:$FN:No temporary working dir set."; exit 1; fi |
0f8ac166 SBS |
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="$8"; else CMD4="tee /dev/null "; fi # command string 4 | |
43 | ||
f0531598 SBS |
44 | # Input command |
45 | CMD0="echo \"\$1\"" | |
46 | ||
4dad1c36 | 47 | # # Debug |
f0531598 | 48 | # yell "DEBUG:STATUS:$FN:CMD0:$CMD0" |
4dad1c36 SBS |
49 | # yell "DEBUG:STATUS:$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:$TMP_DIR" | |
56 | ||
0f8ac166 | 57 | # Write to temporary working dir |
76671929 | 58 | eval "$CMD0 | $CMD1 | $CMD2 | $CMD3 | $CMD4" > "$TMP_DIR"/"$FILENAME"; |
0f8ac166 SBS |
59 | |
60 | # Append to tar | |
61 | try tar --append --directory="$TMP_DIR" --file="$TAR_PATH" "$FILENAME"; | |
4dad1c36 | 62 | #yell "DEBUG:STATUS:$FN:Finished appendArgTar()." |
0f8ac166 SBS |
63 | } # Append Bash var to file appended to Tar archive |
64 | ||
65 | #==BEGIN sample code== | |
0089d651 SBS |
66 | myTar="/tmp/$(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:]'" | |
0f8ac166 SBS |
70 | #==END sample code== |
71 | ||
72 | # Author: Steven Baltakatei Sandoval | |
73 | # License: GPLv3+ |