t/md5.sh

   1 #!/bin/sh
   2 #
   3 # Copyright © 2021 Nick Bowler
   4 #
   5 # Fake md5sum-like program for testing the md5 detection macro.
   6 #
   7 # License WTFPL2: Do What The Fuck You Want To Public License, version 2.
   8 # This is free software: you are free to do what the fuck you want to.
   9 # There is NO WARRANTY, to the extent permitted by law.
  10
  11 : "${MD5_NO_R=}"
  12 : "${MD5_HASH=d41d8cd98f00b204e9800998ecf8427e}"
  13 : "${MD5_DIRECTION=forward}"
  14
  15 stdin=true
  16
  17 print_hash () {
  18   case $MD5_DIRECTION in
  19   forward) printf '%s  %s\n' "$MD5_HASH" "$1" ;;
  20   reverse) printf '%s = %s\n' "$1" "$MD5_HASH" ;;
  21   *) printf 'invalid direction %s\n' "$MD5_DIRECTION" 1>&2; exit 1 ;;
  22   esac
  23 }
  24
  25 for arg
  26 do
  27   case $arg in
  28   -r)
  29     test x"$MD5_NO_R" = x"" || exit
  30     MD5_DIRECTION=forward
  31     continue ;;
  32   md5)
  33     continue ;;
  34   esac
  35
  36   stdin=false
  37   print_hash $arg
  38 done
  39
  40 if $stdin; then
  41   cat >/dev/null
  42   print_hash stdin
  43 fi