#!/usr/bin/perl -w

#

# Licensed to the Apache Software Foundation (ASF) under one or more

# contributor license agreements.  See the NOTICE file distributed with

# this work for additional information regarding copyright ownership.

# The ASF licenses this file to You under the Apache License, Version 2.0

# (the "License"); you may not use this file except in compliance with

# the License.  You may obtain a copy of the License at

#

#     http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

use strict;

use File::Basename;

use File::Copy;

use File::Find;

use File::Path qw(mkpath);

require 5.010;

my $srcdir;

my $destdir;

sub process_file {

    return if $_ =~ /^\./;

    my $rel_to_srcdir = substr($File::Find::name, length($srcdir));

    my $destfile = "$destdir$rel_to_srcdir";

    if (-d $File::Find::name) {

        # If the directory is empty, it won't get created.

        # Otherwise it will get created when copying a file.

    }

    else {

        if (-f $destfile) {

            # Preserve it.

        }

        else {

            # Create it.

            my $dir = dirname($destfile);

            if (! -e $dir) {

                mkpath($dir) or die "Failed to create directory $dir: $!";

            }

            copy($File::Find::name, $destfile) or die "Copy $File::Find::name->$destfile failed: $!";

        }

    }

}

$srcdir = shift;

$destdir = shift;

if (scalar(@ARGV) > 0) {

    my $mode = shift;

    if ($mode eq "ifdestmissing") {

        # Normally the check for possible overwrite is performed on a

        # file-by-file basis.  If "ifdestmissing" is specified and the

        # destination directory exists, bail out.

        if (-d $destdir) {

            print "[PRESERVING EXISTING SUBDIR $destdir]\n";

            exit(0);

        }

    }

    else {

        die "bad mode $mode";

    }

}

find(\&process_file, ($srcdir));