| | 1 | #!/bin/bash |
| | 2 | # Desc: Checks that a valid tar archive exists, creates one otherwise |
| | 3 | |
| | 4 | #===BEGIN Declare local script functions=== |
| | 5 | yell() { echo "$0: $*" >&2; } #o Yell, Die, Try Three-Fingered Claw technique |
| | 6 | die() { yell "$*"; exit 111; } #o Ref/Attrib: https://stackoverflow.com/a/25515370 |
| | 7 | try() { "$@" || die "cannot $*"; } #o |
| | 8 | checkMakeTar() { |
| | 9 | # Desc: Checks that a valid tar archive exists, creates one otherwise |
| | 10 | # Usage: checkMakeTar [ path ] |
| | 11 | # Version: 1.0.2 |
| | 12 | # Input: arg1: path of tar archive |
| | 13 | # Output: exit code 0 : tar readable |
| | 14 | # exit code 1 : tar missing; created |
| | 15 | # exit code 2 : tar not readable; moved; replaced |
| | 16 | # Depends: bash 5, date 8, tar 1, try() |
| | 17 | local pathTar returnFlag0 returnFlag1 returnFlag2 |
| | 18 | pathTar="$1"; |
| | 19 | |
| | 20 | # Check if file is a valid tar archive |
| | 21 | if tar --list --file="$pathTar" 1>/dev/null 2>&1; then |
| | 22 | ## T1: return success |
| | 23 | returnFlag0="tar valid"; |
| | 24 | else |
| | 25 | ## F1: Check if file exists |
| | 26 | if [[ -f "$pathTar" ]]; then |
| | 27 | ### T: Rename file |
| | 28 | try mv "$pathTar" "$pathTar""--broken--""$(date +%Y%m%dT%H%M%S)" && \ |
| | 29 | returnFlag1="tar moved"; |
| | 30 | else |
| | 31 | ### F: - |
| | 32 | : |
| | 33 | fi; |
| | 34 | ## F2: Create tar archive, return 0 |
| | 35 | try tar --create --file="$pathTar" --files-from=/dev/null && \ |
| | 36 | returnFlag2="tar created"; |
| | 37 | fi; |
| | 38 | |
| | 39 | # Determine function return code |
| | 40 | if [[ "$returnFlag0" = "tar valid" ]]; then |
| | 41 | return 0; |
| | 42 | elif [[ "$returnFlag2" = "tar created" ]] && ! [[ "$returnFlag1" = "tar moved" ]]; then |
| | 43 | return 1; # tar missing so created |
| | 44 | elif [[ "$returnFlag2" = "tar created" ]] && [[ "$returnFlag1" = "tar moved" ]]; then |
| | 45 | return 2; # tar not readable so moved; replaced |
| | 46 | fi; |
| | 47 | } # checks if arg1 is tar; creates one otherwise |
| | 48 | #===END Declare local script functions=== |
| | 49 | |
| | 50 | #====BEGIN sample code==== |
| | 51 | #myFile="/tmp/$(date +%s)..tar" |
| | 52 | myFile="/tmp/$(date +%Y%m%d).tar" |
| | 53 | if [[ -f "$myFile" ]]; then yell "$myFile already exists."; else yell "$myFile doesn't yet exist."; fi |
| | 54 | if checkMakeTar "$myFile"; then |
| | 55 | yell "checkMakeTar() function run and exited:$?"; |
| | 56 | else |
| | 57 | yell "checkMakeTar() function run and exited:$?"; |
| | 58 | fi |
| | 59 | |
| | 60 | if [[ -f "$myFile" ]]; then |
| | 61 | yell "Now exists :$myFile"; |
| | 62 | ls -l "$myFile"; |
| | 63 | else |
| | 64 | yell "Does not exist:$myFile"; |
| | 65 | ls -l "$myFile"; |
| | 66 | fi |
| | 67 | #====END sample code==== |
| | 68 | |
| | 69 | # Author: Steven Baltakatei Sandoval |
| | 70 | # License: GPLv3+ |
projects / BK-2020-03.git / blame_incremental