ga-key

   1 #!/usr/bin/env bash
   2
   3 #=======================================================================
   4 # ga-key
   5 # File ID: 027211a6-f115-11e4-9e02-000df06acc56
   6 #
   7 # Generate SHA256 sums, use the same format as SHA256 keys in git-annex.
   8 #
   9 # Author: Øyvind A. Holm <sunny@sunbase.org>
  10 # License: GNU General Public License version 2 or later.
  11 #=======================================================================
  12
  13 progname=ga-key
  14 VERSION=0.3.0
  15
  16 ARGS="$(getopt -o "\
  17 f\
  18 h\
  19 q\
  20 v\
  21 " -l "\
  22 filename,\
  23 help,\
  24 quiet,\
  25 verbose,\
  26 version,\
  27 " -n "$progname" -- "$@")"
  28 test "$?" = "0" || exit 1
  29 eval set -- "$ARGS"
  30
  31 opt_filename=0
  32 opt_help=0
  33 opt_quiet=0
  34 opt_verbose=0
  35 while :; do
  36     case "$1" in
  37         -f|--filename) opt_filename=1; shift ;;
  38         -h|--help) opt_help=1; shift ;;
  39         -q|--quiet) opt_quiet=$(($opt_quiet + 1)); shift ;;
  40         -v|--verbose) opt_verbose=$(($opt_verbose + 1)); shift ;;
  41         --version) echo $progname $VERSION; exit 0 ;;
  42         --) shift; break ;;
  43         *) echo $progname: Internal error >&2; exit 1 ;;
  44     esac
  45 done
  46 opt_verbose=$(($opt_verbose - $opt_quiet))
  47
  48 if test "$opt_help" = "1"; then
  49     test $opt_verbose -gt 0 && { echo; echo $progname $VERSION; }
  50     cat <<END
  51
  52 Generate SHA256 sums, use the format used by the "SHA256" backend in
  53 git-annex.
  54
  55 Usage: $progname [options] FILE [FILE ...]
  56
  57 Options:
  58
  59   -f, --filename
  60     Include filenames in output.
  61   -h, --help
  62     Show this help.
  63   -q, --quiet
  64     Be more quiet. Can be repeated to increase silence.
  65   -v, --verbose
  66     Increase level of verbosity. Can be repeated.
  67   --version
  68     Print version information.
  69
  70 END
  71     exit 0
  72 fi
  73
  74 test -z "$1" && { echo $progname: Missing filename >&2; exit 1; }
  75
  76 for file in "$@"; do
  77     if test ! -f "$file"; then
  78         test $opt_verbose -ge 0 && echo $progname: $file: Ignoring non-file >&2
  79         continue
  80     fi
  81     if test "$opt_filename" = "1"; then
  82         fname_str=" $file"
  83     else
  84         fname_str=""
  85     fi
  86     echo SHA256-s$(
  87         wc -c "$file" | cut -f 1 -d ' '
  88     )--$(sha256sum "$file" | head -c 64)$fname_str
  89 done