Arthur Corliss > Paranoid > Paranoid::Glob

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NAME ^

Paranoid::Glob - Paranoid Glob objects

VERSION ^

$Id: Glob.pm,v 0.2 2010/04/21 09:07:30 acorliss Exp $

SYNOPSIS ^

    $obj = Paranoid::Glob->new(
           globs       => [ qw(/lib/* /sbin/* /etc/foo.conf) ],
           literals    => [ qw(/tmp/{sadssde-asdfak}) ],
           );

    print "Expanded globs:\n\t", join("\n\t", @$obj);

    $rv = $obj->addGlobs(qw(/etc/* /bin/*));
    $rv = $obj->addLiterals(qw(/etc/foo.conf));

    $obj->consolidate;

    @existing       = $obj->exists;
    @readable       = $obj->readable;
    @writable       = $obj->writable;
    @executable     = $obj->executable;
    @owned          = $obj->owned;
    @directories    = $obj->directories;
    @files          = $obj->files;
    @symlinks       = $obj->symlinks;
    @pipes          = $obj->pipes;
    @sockets        = $obj->sockets;
    @blockDevs      = $obj->blockDevs;
    @charDevs       = $obj->charDevs;

    $obj->recurse(1, 1);

DESCRIPTION ^

The primary purpose of these objects is to allow an easy way to detaint a list of files and/or directories while performing shell expansion of names. It does this with a caveat, however. If a given file or directory name exists on the file system as a literal string (regardless of whether it has shell expansion characters in it) it will be added as such. It is only filtered through bsd_glob if it does not exist on the file system.

The objects can also be created with instructions to explicitly treat all names as literal strings.

Any undef or zero-length strings passed in the files array are silently removed.

As a convenience subsets of the expanded files can be returned based on the common stat/lstat tests. Please note the obvious caveats, however: asking for a list of directories will fail to list directories if the effective user does not have privileges to read the parent directory, etc. This is no different than performing '-d', etc., directly. If you care about privilege/permission issues you shouldn't use these methods.

An additional method (recurse) falls outside of what a globbing construct should do, but it seemed too useful to leave out.

SUBROUTINES/METHODS ^

new

    $obj = Paranoid::Glob->new(
           globs       => [ qw(/lib/* /sbin/* /etc/foo.conf) ],
           literals    => [ qw(/tmp/{sadssde-asdfak}) ],
           );

This class method creates a Paranoid::Glob object. It can be constructed with optional literal strings and/or globs to expand. All are filtered through a [[:print:]] regex for detainting. Any undefined or zero-length strings are silently removed from the arrays.

The object reference is a blessed array reference, which is populated with the expanded (or literal) globs, making it easy to iterate over the final list.

If any entry in the globs array fails to detaint this method will return undef instead of an object reference.

addGlobs

    $rv = $obj->addGlobs(qw(/etc/* /bin/*));

Adds more globs to the object that are detainted and filtered through bsd_glob. Returns false if any strings fail to detaint. All undefined or zero-length strings are silently removed.

addLiterals

    $rv = $obj->addLiterals(qw(/etc/foo.conf));

Adds more literal strings to the object that are detainted. Returns false if any strings fail to detaint. All undefined or zero-length strings are silently removed.

consolidate

    $obj->consolidate;

This method removes redundant entries and lexically sorts the contents of the glob.

exists

    @existing       = $obj->exists;

This object method returns a list of all entries that currently exist on the filesystem. In the case of a symlink that exists but links to a nonexistent file it returns the symlink as well.

readable

    @readable       = $obj->readable;

This method returns a list of all entries that are currently readable by the effective user. In the case of a symlink it returns the symlink only if the target of the symlink is readable, just as a normal stat or -r function would.

writable

    @writable       = $obj->writable;

This method returns a list of all entries that are currently writable by the effective user. In the case of a symlink it returns the symlink only if the target of the symlink is writable, just as a normal stat or -w function would.

executable

    @executable     = $obj->executable;

This method returns a list of all entries that are currently executable by the effective user. In the case of a symlink it returns the symlink only if the target of the symlink is executable, just as a normal stat or -x function would.

owned

    @owned          = $obj->owned;

This method returns a list of all entries that are currently owned by the effective user. In the case of a symlink it returns the symlink only if the target of the symlink is owned, just as a normal stat or -o function would.

directories

    @directories    = $obj->directories;

This method returns a list of all the directories. In the case of a symlink it returns the symlink if the target of the symlink is a directory, just as a normal stat or -d function would.

files

    @files          = $obj->files;

This method returns a list of all the files. In the case of a symlink it returns the symlink if the target of the symlink is a file, just as a normal stat or -f function would.

symlinks

    @symlinks       = $obj->symlinks;

This method returns a list of all the symlinks.

pipes

    @pipes          = $obj->pipes;

This method returns a list of all the pipes. In the case of a symlink it returns the symlink if the target of the symlink is a pipe, just as a normal stat or -p function would.

sockets

    @sockets        = $obj->sockets;

This method returns a list of all the sockets. In the case of a symlink it returns the symlink if the target of the symlink is a socket, just as a normal stat or -S function would.

blockDevs

    @blockDevs      = $obj->blockDevs;

This method returns a list of all the block device nodes. In the case of a symlink it returns the symlink if the target of the symlink is a block device node, just as a normal stat or -b function would.

charDevs

    @charDevs       = $obj->charDevs;

This method returns a list of all the character device nodes. In the case of a symlink it returns the symlink if the target of the symlink is a character device node, just as a normal stat or -c function would.

recurse

    $obj->recurse;
    $obj->recurse(1);
    $obj->recurse(1, 1);

This method with recursively load all filesystem entries underneath any directories already listed in the object. It returns true upon completion, or false if any errors occured (such as Permission Denied).

Two optional boolean arguments can be passed to it:

  Option1:        Follow Symlinks
  Option2:        Include "Hidden" directories

Both options are false by default. If Option1 (Follow Symlinks) is true any symlinks pointing to directories will be recursed into as well. Option2 in its default false setting excludes dot files or directories just as normal shell expansion would. Setting it to true causes it to include (and recurse into) hidden files and directories.

DEPENDENCIES ^

o

Carp

o

Errno

o

Fcntl

o

File::Glob

o

Paranoid

o

Paranoid::Debug

BUGS AND LIMITATIONS ^

AUTHOR ^

Arthur Corliss (corliss@digitalmages.com)

LICENSE AND COPYRIGHT ^

This software is licensed under the same terms as Perl, itself. Please see http://dev.perl.org/licenses/ for more information.

(c) 2009, Arthur Corliss (corliss@digitalmages.com)

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