examples/zyg.sh

   1 #!/bin/sh
   2 # Run z-machine interpreter, allowing the user to save their game in a
   3 # directory specific to their client cert.
   4
   5 var=/var/gemini/zyg/
   6
   7 [ -n "$TLS_CLIENT_HASH" ] || exit 1
   8
   9 if [ -n "$INIT_QUERY" ]; then
  10     sanitised="$(tr -dc [:alnum:]_ <<< "$INIT_QUERY")"
  11     gamefile="$var/games/$sanitised"
  12     if ! ( [ -n "$sanitised" ] && [ -e "$gamefile" ] ); then
  13         echo "Unknown game: $sanitised"
  14         exit 1
  15     fi
  16 else
  17     echo "Choose your poison:"
  18     ls -1 "$var/games/"
  19
  20     while read input; do
  21         sanitised="$(tr -dc [:alnum:]_ <<< "$input")"
  22         gamefile="$var/games/$sanitised"
  23         if [ -n "$sanitised" ] && [ -e "$gamefile" ]; then
  24             break;
  25         fi
  26         echo "Please enter one of the listed games"
  27     done
  28 fi
  29
  30 echo "Starting $sanitised. Savefiles will be preserved."
  31 echo
  32
  33 savesdir="$var/$TLS_CLIENT_HASH/$sanitised"
  34
  35 mkdir -p "$savesdir" || exit 1
  36 cd "$savesdir" || exit 1
  37
  38 # Impose some limits to reduce potential for abuse
  39 ulimit -t 1200
  40 ulimit -f 5000
  41 ulimit -v 20000
  42
  43 # using the z-machine interpreter infuse, which has a nice stdio interface:
  44 # https://gitlab.com/monkeymind/infuse
  45 stdbuf -i0 -o0 infuse "$gamefile"
  46
  47 # Previous attempt: using dfrotz, but it has some problems.
  48 #dfrotz -m -Z0 -R. "$gamefile"