vfs/extfs/ulha.in

   1 #! /bin/sh
   2
   3 #
   4 # LHa Virtual filesystem executive v0.1
   5 # Copyright (C) 1996, 1997 Joseph M. Hinkle
   6 # May be distributed under the terms of the GNU Public License
   7 # <jhinkle@rockisland.com>
   8 #
   9
  10 # Code for mc_lha_fs_run() suggested by:
  11 # Jan 97        Zdenek Kabelac <kabi@informatics.muni.cz>
  12
  13 # Tested with mc 3.5.18 and gawk 3.0.0 on Linux 2.0.0
  14 # Tested with lha v1.01 and lharc v1.02
  15 # Information and sources for other forms of lha/lzh appreciated
  16
  17 # Nota bene:
  18 # There are several compression utilities which produce *.lha files.
  19 # LHArc and LHa in exist several versions, and their listing output varies.
  20 # Another variable is the architecture on which the compressed file was made.
  21 # This program attempts to sort out the variables known to me, but it is likely
  22 # to display an empty panel if it encounters a mystery.
  23 # In that case it will be useful to execute this file from the command line:
  24 # ./lha list Mystery.lha
  25 # to examine the output directly on the console.  The output string must be
  26 # precisely in the format described in the README in this directory.
  27 # Caveat emptor.
  28 # Learn Latin.
  29
  30 # Define your awk
  31 AWK=@AWK@
  32
  33 # Define which archiver you are using with appropriate options
  34 LHA_LIST="lha lq"
  35 LHA_GET="lha pq"
  36 LHA_PUT="lha aq"
  37
  38 # The 'list' command executive
  39
  40 mc_lha_fs_list()
  41 {
  42    # List the contents of the archive and sort it out
  43    $LHA_LIST "$1" | $AWK -v uid=`id -nu` -v gid=`id -ng` '
  44       # Strip a leading '/' if present in a filepath
  45       $(NF) ~ /^\// { $(NF) = substr($NF,2) }
  46       # Print the line this way if there is no permission string
  47       $1 ~ /^\[.*\]/ {
  48          # Invent a generic permission
  49          $1 = ($NF ~ /\/$/) ? "drwxr-xr-x":"-rwxr--r--";
  50          # Print it
  51          printf "%s 1 %-8s %-8s %-8d %s %s %s %s\n",
  52                  $1, uid, gid, $2, $4, $5, $6, $7;
  53          # Get the next line of the list
  54          next;
  55       }
  56       # Do it this way for a defined permission
  57       $1 !~ /^\[.*\]/ {
  58          # If the permissions and UID run together
  59          if ($1 ~ /\//) {
  60             $8 = $7;
  61             $7 = $6;
  62             $6 = $5;
  63             $5 = $4;
  64             $3 = $2;
  65             $2 = substr($1,10);
  66             $1 = substr($1,1,9);
  67          }
  68          # If the permission string is missing a type
  69          if (length($1) == 9) {
  70             if ($NF ~ /\/$/)
  71                $1 = ("d" $1);
  72             else
  73                $1 = ("-" $1);
  74          }
  75          # UID:GID might not be the same as on your system so print numbers
  76          # Well, that is the intent.  At the moment mc is translating them.
  77          split($2, id, "/");
  78          printf "%s 1 %-8d %-8d %-8d %s %s %s %s\n",
  79                  $1, id[1], id[2], $3, $5, $6, $7, $8;
  80          # Get the next line of the list
  81          next;
  82       }
  83
  84    '
  85 }
  86
  87 # The 'copyout' command executive to copy displayed files to a destination
  88
  89 mc_lha_fs_copyout()
  90 {
  91    $LHA_GET "$1" "$2" > "$3"
  92 }
  93
  94 # The 'copyin' command executive to add something to the archive
  95
  96 mc_lha_fs_copyin ()
  97 {
  98    NAME2=`basename "$2"`; DIR2=${2%$NAME2}
  99    NAME3=`basename "$3"`; DIR3=${3%$NAME3}
 100
 101    cd "${DIR3}"
 102
 103    ONE2=${2%%/*}
 104    [ -n "${ONE2}" ] || exit 1
 105    [ -e "${ONE2}" ] && exit 1
 106
 107    [ -e "${DIR2}" ] || mkdir -p "${DIR2}"
 108    ln "$3" "$2"       || exit 1
 109
 110    $LHA_PUT "$1" "$2"
 111    rm -r "${ONE2}"
 112 }
 113
 114 # The 'run' command executive to run a command from within an archive
 115
 116 mc_lha_fs_run()
 117 {
 118    TMPDIR=`mktemp -d "${MC_TMPDIR:-/tmp}/mctmpdir-ulha.XXXXXX"` || exit 1
 119    trap "rm -rf \"$TMPDIR\"; exit 0" 1 2 3 4 15
 120    TMPCMD=$TMPDIR/run
 121    $LHA_GET "$1" "$2" > $TMPCMD
 122    chmod a+x "$TMPCMD"
 123    "$TMPCMD"
 124    rm -rf "$TMPDIR"
 125 }
 126
 127
 128 # The main routine
 129 umask 077
 130
 131 cmd="$1"
 132 shift
 133
 134 case "$cmd" in
 135    list)    mc_lha_fs_list    "$@" ;;
 136    copyout) mc_lha_fs_copyout "$@" ;;
 137    copyin)  mc_lha_fs_copyin  "$@" ;;
 138    run)     mc_lha_fs_run     "$@" ;;
 139    *)       exit 1 ;;
 140 esac
 141
 142 exit 0