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   1  ;# The validate routine takes a single multiline string consisting of
   2  ;# lines containing a filename plus a file test to try on it.  (The
   3  ;# file test may also be a 'cd', causing subsequent relative filenames
   4  ;# to be interpreted relative to that directory.)  After the file test
   5  ;# you may put '|| die' to make it a fatal error if the file test fails.
   6  ;# The default is '|| warn'.  The file test may optionally have a ! prepended
   7  ;# to test for the opposite condition.  If you do a cd and then list some
   8  ;# relative filenames, you may want to indent them slightly for readability.
   9  ;# If you supply your own "die" or "warn" message, you can use $file to
  10  ;# interpolate the filename.
  11  
  12  ;# Filetests may be bunched:  -rwx tests for all of -r, -w and -x.
  13  ;# Only the first failed test of the bunch will produce a warning.
  14  
  15  ;# The routine returns the number of warnings issued.
  16  
  17  ;# Usage:
  18  ;#    require "validate.pl";
  19  ;#    $warnings += do validate('
  20  ;#    /vmunix            -e || die
  21  ;#    /boot            -e || die
  22  ;#    /bin            cd
  23  ;#        csh            -ex
  24  ;#        csh            !-ug
  25  ;#        sh            -ex
  26  ;#        sh            !-ug
  27  ;#    /usr            -d || warn "What happened to $file?\n"
  28  ;#    ');
  29  
  30  sub validate {
  31      local($file,$test,$warnings,$oldwarnings);
  32      foreach $check (split(/\n/,$_[0])) {
  33      next if $check =~ /^#/;
  34      next if $check =~ /^$/;
  35      ($file,$test) = split(' ',$check,2);
  36      if ($test =~ s/^(!?-)(\w{2,}\b)/$1Z/) {
  37          $testlist = $2;
  38          @testlist = split(//,$testlist);
  39      }
  40      else {
  41          @testlist = ('Z');
  42      }
  43      $oldwarnings = $warnings;
  44      foreach $one (@testlist) {
  45          $this = $test;
  46          $this =~ s/(-\w\b)/$1 \$file/g;
  47          $this =~ s/-Z/-$one/;
  48          $this .= ' || warn' unless $this =~ /\|\|/;
  49          $this =~ s/^(.*\S)\s*\|\|\s*(die|warn)$/$1 || do valmess('$2','$1')/;
  50          $this =~ s/\bcd\b/chdir (\$cwd = \$file)/g;
  51          eval $this;
  52          last if $warnings > $oldwarnings;
  53      }
  54      }
  55      $warnings;
  56  }
  57  
  58  sub valmess {
  59      local($disposition,$this) = @_;
  60      $file = $cwd . '/' . $file unless $file =~ m|^/|;
  61      if ($this =~ /^(!?)-(\w)\s+\$file\s*$/) {
  62      $neg = $1;
  63      $tmp = $2;
  64      $tmp eq 'r' && ($mess = "$file is not readable by uid $>.");
  65      $tmp eq 'w' && ($mess = "$file is not writable by uid $>.");
  66      $tmp eq 'x' && ($mess = "$file is not executable by uid $>.");
  67      $tmp eq 'o' && ($mess = "$file is not owned by uid $>.");
  68      $tmp eq 'R' && ($mess = "$file is not readable by you.");
  69      $tmp eq 'W' && ($mess = "$file is not writable by you.");
  70      $tmp eq 'X' && ($mess = "$file is not executable by you.");
  71      $tmp eq 'O' && ($mess = "$file is not owned by you.");
  72      $tmp eq 'e' && ($mess = "$file does not exist.");
  73      $tmp eq 'z' && ($mess = "$file does not have zero size.");
  74      $tmp eq 's' && ($mess = "$file does not have non-zero size.");
  75      $tmp eq 'f' && ($mess = "$file is not a plain file.");
  76      $tmp eq 'd' && ($mess = "$file is not a directory.");
  77      $tmp eq 'l' && ($mess = "$file is not a symbolic link.");
  78      $tmp eq 'p' && ($mess = "$file is not a named pipe (FIFO).");
  79      $tmp eq 'S' && ($mess = "$file is not a socket.");
  80      $tmp eq 'b' && ($mess = "$file is not a block special file.");
  81      $tmp eq 'c' && ($mess = "$file is not a character special file.");
  82      $tmp eq 'u' && ($mess = "$file does not have the setuid bit set.");
  83      $tmp eq 'g' && ($mess = "$file does not have the setgid bit set.");
  84      $tmp eq 'k' && ($mess = "$file does not have the sticky bit set.");
  85      $tmp eq 'T' && ($mess = "$file is not a text file.");
  86      $tmp eq 'B' && ($mess = "$file is not a binary file.");
  87      if ($neg eq '!') {
  88          $mess =~ s/ is not / should not be / ||
  89          $mess =~ s/ does not / should not / ||
  90          $mess =~ s/ not / /;
  91      }
  92      print STDERR $mess,"\n";
  93      }
  94      else {
  95      $this =~ s/\$file/'$file'/g;
  96      print STDERR "Can't do $this.\n";
  97      }
  98      if ($disposition eq 'die') { exit 1; }
  99      ++$warnings;
 100  }
 101  
 102  1;