user/check_ots.sh

   1 #!/usr/bin/env bash
   2 # Desc: Upgrades and verfies ots files.
   3 # Usage: check_ots.sh [file]
   4 # Example: ./check_ots.sh foo.txt.ots
   5 # Note: Only outputs stderr or stdout on upgrade or verify failures.
   6 # Version 0.0.2
   7 # Depends: Bash 5.1.16, GNU Coreutils 8.32 (date), ots 0.7.0
   8
   9 # Plumbing
  10 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
  11 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
  12 must() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
  13 check_givens() {
  14     if [[ ! -f $1 ]]; then die "FATAL:Not a file:$1"; fi;
  15     re=".ots$|.OTS$";
  16     if [[ ! "$1" =~ $re ]]; then die "FATAL:Not an OTS file extension:$1"; fi;
  17     if [[ $# -ne 1 ]]; then die "FATAL:Incorrect argument count:$#"; fi;
  18     if ! command -v ots 1>/dev/random 2>&1; then die "FATAL:Not found:ots"; fi;
  19 };  # Check given assumptions
  20 upgrade_ots() {
  21     # Depends: GNU Coreutils 8.32 (date), ots 0.7.0
  22
  23     file_in="$1";
  24     file_bak="$file_in".bak ;
  25
  26     # # Upgrade ots
  27     if [[ ! -f "$file_bak" ]]; then
  28         "$(which ots)" u "$file_in" 1>/dev/null 2>&1;
  29     else
  30         yell "ERROR:Upgrade failed due to existing backup:$file_bak";
  31     fi;
  32 }; # Upgrades ots file
  33 verify_ots() {
  34     # Depends: ots 0.7.0
  35
  36     if ! ( ots v "$1" 1>/dev/random 2>&1 ); then
  37         yell "ERROR:Verification failed:$1";
  38         ots v "$1"; # Show error
  39     fi;
  40 }; # Verify ots file
  41 main() {
  42     must check_givens "$1";
  43     must upgrade_ots "$1";
  44     must verify_ots "$1";
  45 };
  46
  47 main "$@";
  48
  49 # Author: Steven Baltakatei Sandoval
  50 # License: GPLv3+
  51
  52 # ots 0.7.0
  53 #   See https://opentimestamps.org/