user/cbz_dedup.sh

   1 #!/bin/bash
   2 # Desc: Deduplicates files within a CBZ file
   3 # Usage: cbz_dedup.sh [CBZ file]
   4 # Example: cbz_dedup.sh input.cbz
   5 # Version: 0.0.5
   6 # Depends: jdupes 1.27.3, unzip 6.00 by Debian
   7
   8
   9 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
  10 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
  11 must() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
  12 showUsage() {
  13     # Desc: Display script usage information
  14     # Usage: showUsage
  15     # Version 0.0.2
  16     # Input: none
  17     # Output: stdout
  18     # Depends: GNU-coreutils 8.30 (cat)
  19     cat <<'EOF'
  20     USAGE:
  21         cbz_dedup.sh [FILE]
  22
  23     EXAMPLE:
  24       cbz_dedup.sh input.cbz
  25 EOF
  26 }; # Display information on how to use this script.
  27 main() {
  28      fout="output.cbz";
  29
  30      # Check args
  31      if [[ $# -ne 1 ]]; then showUsage; die "FATAL:Invalid arg count (should be 1):$#"; fi;
  32      re1='\.cbz$';
  33      if [[ ! "$1" =~ $re1 ]]; then showUsage; die "FATAL:Not a .cbz file:$1"; fi;
  34      if [[ ! -f "$1" ]]; then die "FATAL:Not a file:$1"; fi;
  35      fin="$1";
  36      dir_tmp="$(mktemp -d)";
  37      if [[ ! -d "$dir_tmp" ]]; then die "FATAL:Could not make temporary directory:${dir_tmp}"; fi;
  38      trap 'rm -rf "${dir_tmp}"' EXIT;
  39      pout="${dir_tmp}/${fout}";
  40
  41      # Check depends
  42      for _cmd in unzip zip jdupes; do
  43          if ! command -v "$_cmd" 1>/dev/random 2>&1; then
  44              die "FATAL:Missing app:${_cmd}";
  45          fi;
  46      done;
  47
  48      # Extract CBZ to temp dir
  49      must unzip "$fin" -x / -d "$dir_tmp";
  50
  51      # Dedupe with jdupes
  52      ## Check size before
  53      tmp_size1="$(du -bd0 "$dir_tmp" | cut -f1; )";
  54      must jdupes -dN "${dir_tmp}";
  55      ## Check size after
  56      tmp_size2="$(du -bd0 "$dir_tmp" | cut -f1; )";
  57
  58      # Replace CBZ if size changed
  59      if [[ "$tmp_size1" -eq "$tmp_size2" ]]; then yell "STATUS:No deduplication detected."; return 0; fi;
  60
  61      ## Recreate CBZ
  62      must zip -j "$pout" "${dir_tmp}"/*;
  63
  64      ## Preserve original CBZ
  65      must mv -n "$fin" "${fin%.*}_original.cbz";
  66
  67      ## Move deduped CBZ
  68      must mv -n "$pout" "$fin";
  69
  70      return 0;
  71 };
  72
  73 main "$@";