NetSDS::Util::File3pm

Usage

        use NetSDS::Util::File qw(file_read);
        my $passwd = file_read('/etc/passwd');
        file_move('/etc/passwd', '/tmp/find_this');

Overview

"NetSDS::Util::File" module contains some routines for files and directories processing tasks like creating, reading, writing, copying and moving files and catalogs.

This module of cource uses such well known things like File::Spec, File::Path, File::Copy and others.

Exported functions

is_handle($var) - check if argument is a file handle

Parameters: some variable

Returns: 1 if it's file handle or undef otherwise

        if (is_handle($var)) {
                reset_handle($fh);
        }

reset_handle($fh) - reset file handle

Parameters: file handle

Returns: nothing

This function tries to set filehandle to begin of file and set binmode on it.

        my $fh = file_open('/etc/passwd');
        ...
        do something with file
        ...
        reset_handle($fh); # We can read it from the beginning

file_open($file) - open file

Parameters: file name or file handle

Returns: file handle

This function provides unified API for opening files.

        my $f = file_open('/etc/passwd');

file_read($file) - read file to scalar

Parameters: file name or file handle

Returns: scalar content of file

This function provides ability to read file content to scalar variable.

        my $data = file_read('/etc/passwd');
        print "Passwords file: $data\n";

file_write($file, $data) - write scalar data to file

Parameters: file name or open file handle

Returns: length of written data or undef in case of error

        my $data = 'This should be file';
        file_write('/tmp/file.dat', $data);

file_copy($in_file, $out_file) - copy file

Parameters: input file name, output file name

Returns:

This function copy file to new location.

file_move($in_file, $out_file) - move file

Parameters: input file name, output file name

Returns: 1 or undef

This function moves old file to new location.

file_temp($dir) - create temporary file

Creates new temp file and return its handle

dir_create($dir) - create directory with parents

Parameters: directory name

Returns: directory name or undef

        # Will create all parent catalogs if necessary
        dir_create('/var/log/NetSDS/xxx');

dir_delete($dir) - remove directory recursive

Parameters: directory name

Returns: dir name or undef if error

        print "We need no libs!";
        dir_delete('/usr/lib');

dir_read($dir, $ext) - read files list from catalog

Parameters: directory name, extension of files to read

Returns: list of files in catalog

        my @logs = @{ dir_read('/var/log/httpd', 'log') };
        print "Logs are: " . join (', ', @logs);

dir_read_recursive($dir, $ext, [$res]) - read all files list recursive

Parameters: $start catalog, $extension

Returns: list of files with extension from parameters

        my $tpls = dir_read_recursive('/etc/NetSDS', 'tmpl');
        foreach my $tpl (@$tpls) {
                pritn "Template: $tpl\n";
        }

exec_external($prog, [$param1, ... $paramN]) - execute external program

Parameters: pragram name, arguments list (see perldoc -f system)

Returns: 1 if ok, undef otherwise

This function calls system() with given parameters and returns 1 if everything happened correctly (program executed and returned correct result).

        if (exec_external('/bin/rm', '-rf', '/')) {
                print "Hey! We removed the world!";
        }

Examples

None yet

Todo

1. Implement more detailed error handling