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Perl Cookbook
book

Perl Cookbook

by Tom Christiansen, Nathan Torkington
August 1998
Intermediate to advanced content levelIntermediate to advanced
800 pages
39h 20m
English
O'Reilly Media, Inc.
Content preview from Perl Cookbook

Program: symirror

The program in Example 9.6 recursively duplicates a directory tree, making a shadow forest full of symlinks pointing back at the real files.

Example 9-6. symirror

#!/usr/bin/perl -w
# symirror - build spectral forest of symlinks
use strict;
use File::Find;
use Cwd;

my ($srcdir, $dstdir);
my $cwd = getcwd();
die "usage: $0 realdir mirrordir" unless @ARGV == 2;

for (($srcdir, $dstdir) = @ARGV) {
    my $is_dir = -d;
    next if $is_dir;                        # cool
    if (defined ($is_dir)) {
        die "$0: $_ is not a directory\n";
    } else {                                # be forgiving
        mkdir($dstdir, 07777) or die "can't mkdir $dstdir: $!";
    }
} continue {
    s#^(?!/)#$cwd/#;                        # fix relative paths
}
                    
chdir $srcdir;
find(\&wanted, '.');

sub wanted {
    my($dev, $ino, $mode) = lstat($_);
    my $name = $File::Find::name;
    $mode &= 07777;                 # preserve directory permissions
    $name =~ s!^\./!!;              # correct name
    if (-d _) {                     # then make a real directory
        mkdir("$dstdir/$name", $mode)
            or die "can't mkdir $dstdir/$name: $!";
    } else {                        # shadow everything else
        symlink("$srcdir/$name", "$dstdir/$name")
            or die "can't symlink $srcdir/$name to $dstdir/$name: $!";
    }
}
               
               
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Publisher Resources

ISBN: 1565922433Supplemental ContentCatalog PageErrata