Personal Computer World 2009 February/PCWFEB09.iso/Software/Linux/Kubuntu 8.10/kubuntu-8.10-desktop-i386.iso/casper/filesystem.squashfs/usr/share/perl/5.10.0/validate.pl

Text File | 2008-07-24 | 4KB | 103 lines

;# The validate routine takes a single multiline string consisting of
;# lines containing a filename plus a file test to try on it.  (The
;# file test may also be a 'cd', causing subsequent relative filenames
;# to be interpreted relative to that directory.)  After the file test
;# you may put '|| die' to make it a fatal error if the file test fails.
;# The default is '|| warn'.  The file test may optionally have a ! prepended
;# to test for the opposite condition.  If you do a cd and then list some
;# relative filenames, you may want to indent them slightly for readability.
;# If you supply your own "die" or "warn" message, you can use $file to
;# interpolate the filename.

;# Filetests may be bunched:  -rwx tests for all of -r, -w and -x.
;# Only the first failed test of the bunch will produce a warning.

;# The routine returns the number of warnings issued.

;# Usage:
;#    require "validate.pl";
;#    $warnings += do validate('
;#    /vmunix            -e || die
;#    /boot            -e || die
;#    /bin            cd
;#        csh            -ex
;#        csh            !-ug
;#        sh            -ex
;#        sh            !-ug
;#    /usr            -d || warn "What happened to $file?\n"
;#    ');

sub validate {
    local($file,$test,$warnings,$oldwarnings);
    foreach $check (split(/\n/,$_[0])) {
    next if $check =~ /^#/;
    next if $check =~ /^$/;
    ($file,$test) = split(' ',$check,2);
    if ($test =~ s/^(!?-)(\w{2,}\b)/$1Z/) {
        $testlist = $2;
        @testlist = split(//,$testlist);
    }
    else {
        @testlist = ('Z');
    }
    $oldwarnings = $warnings;
    foreach $one (@testlist) {
        $this = $test;
        $this =~ s/(-\w\b)/$1 \$file/g;
        $this =~ s/-Z/-$one/;
        $this .= ' || warn' unless $this =~ /\|\|/;
        $this =~ s/^(.*\S)\s*\|\|\s*(die|warn)$/$1 || do valmess('$2','$1')/;
        $this =~ s/\bcd\b/chdir (\$cwd = \$file)/g;
        eval $this;
        last if $warnings > $oldwarnings;
    }
    }
    $warnings;
}

sub valmess {
    local($disposition,$this) = @_;
    $file = $cwd . '/' . $file unless $file =~ m|^/|;
    if ($this =~ /^(!?)-(\w)\s+\$file\s*$/) {
    $neg = $1;
    $tmp = $2;
    $tmp eq 'r' && ($mess = "$file is not readable by uid $>.");
    $tmp eq 'w' && ($mess = "$file is not writable by uid $>.");
    $tmp eq 'x' && ($mess = "$file is not executable by uid $>.");
    $tmp eq 'o' && ($mess = "$file is not owned by uid $>.");
    $tmp eq 'R' && ($mess = "$file is not readable by you.");
    $tmp eq 'W' && ($mess = "$file is not writable by you.");
    $tmp eq 'X' && ($mess = "$file is not executable by you.");
    $tmp eq 'O' && ($mess = "$file is not owned by you.");
    $tmp eq 'e' && ($mess = "$file does not exist.");
    $tmp eq 'z' && ($mess = "$file does not have zero size.");
    $tmp eq 's' && ($mess = "$file does not have non-zero size.");
    $tmp eq 'f' && ($mess = "$file is not a plain file.");
    $tmp eq 'd' && ($mess = "$file is not a directory.");
    $tmp eq 'l' && ($mess = "$file is not a symbolic link.");
    $tmp eq 'p' && ($mess = "$file is not a named pipe (FIFO).");
    $tmp eq 'S' && ($mess = "$file is not a socket.");
    $tmp eq 'b' && ($mess = "$file is not a block special file.");
    $tmp eq 'c' && ($mess = "$file is not a character special file.");
    $tmp eq 'u' && ($mess = "$file does not have the setuid bit set.");
    $tmp eq 'g' && ($mess = "$file does not have the setgid bit set.");
    $tmp eq 'k' && ($mess = "$file does not have the sticky bit set.");
    $tmp eq 'T' && ($mess = "$file is not a text file.");
    $tmp eq 'B' && ($mess = "$file is not a binary file.");
    if ($neg eq '!') {
        $mess =~ s/ is not / should not be / ||
        $mess =~ s/ does not / should not / ||
        $mess =~ s/ not / /;
    }
    print STDERR $mess,"\n";
    }
    else {
    $this =~ s/\$file/'$file'/g;
    print STDERR "Can't do $this.\n";
    }
    if ($disposition eq 'die') { exit 1; }
    ++$warnings;
}

1;