PAR::Dist(3)

NAME
PAR::Dist - Create and manipulate PAR distributions

VERSION
This document describes version 0.20 of PAR::Dist, released Oct 11, 2006.

SYNOPSIS
As a shell command:

    % perl -MPAR::Dist -eblib_to_par

In programs:

    use PAR::Dist;

    my $dist = blib_to_par();   # make a PAR file using ./blib/
    install_par($dist);         # install it into the system
    uninstall_par($dist);       # uninstall it from the system
    sign_par($dist);            # sign it using Module::Signature
    verify_par($dist);          # verify it using Module::Signature

    install_par("http://foo.com/DBI-1.37-MSWin32-5.8.0.par"); # works too
    install_par("http://foo.com/DBI-1.37"); # auto-appends archname + perlver
    install_par("cpan://SMUELLER/PAR-0.91"); # uses CPAN author directory

DESCRIPTION
This module creates and manipulates PAR distributions. They are architecture-specific PAR files, containing everything under blib/ of CPAN distributions after their "make" or "Build" stage, a META.yml describing metadata of the original CPAN distribution, and a MANIFEST detailing all files within it. Digitally signed PAR distributions will also contain a SIGNATURE file.

The naming convention for such distributions is:

    $NAME-$VERSION-$ARCH-$PERL_VERSION.par

For example, "PAR-Dist-0.01-i386-freebsd-5.8.0.par" corresponds to the 0.01 release of "PAR-Dist" on CPAN, built for perl 5.8.0 running on "i386-freebsd".

FUNCTIONS
Several functions are exported by default. Unless otherwise noted, they can take either a hash of named arguments, a single argument (taken as $path by "blib_to_par" and $dist by other functions), or no arguments (in which case the first PAR file in the current directory is used).

Therefore, under a directory containing only a single test.par, all invocations below are equivalent:

    % perl -MPAR::Dist -e"install_par( dist => 'test.par' )"
    % perl -MPAR::Dist -e"install_par( 'test.par' )"
    % perl -MPAR::Dist -einstall_par;

If $dist resembles a URL, "LWP::Simple::mirror" is called to mirror it locally under $ENV{PAR_TEMP} (or "$TEMP/par/" if unspecified), and the function will act on the fetched local file instead. If the URL begins with "cpan://AUTHOR/", it will be expanded automatically to the author's CPAN directory (e.g. "http://www.cpan.org/modules/by-authors/id/A/AU/AUTHOR/").

If $dist does not have a file extension beginning with a letter or underscore, a dash and $suffix ($ARCH-$PERL_VERSION.par by default) will be appended to it.

  blib_to_par
Takes key/value pairs as parameters or a single parameter indicating the path that contains the blib/ subdirectory.

Builds a PAR distribution from the blib/ subdirectory under "path", or under the current directory if unspecified. If blib/ does not exist, it automatically runs Build, make, Build.PL or Makefile.PL to create it.

Returns the filename or the generated PAR distribution.

Valid parameters are:

path
    Sets the path which contains the blib/ subdirectory from which the PAR distribution will be generated.

name, version, suffix
    These attributes set the name, version and platform specific suffix of the distribution. Name and version can be automatically determined from the distributions META.yml or Makefile.PL files.

    The suffix is generated from your architecture name and your version of perl by default.

dist
    The output filename for the PAR distribution.

  install_par
Installs a PAR distribution into the system, using "ExtUtils::Install::install_default".

Valid parameters are:

dist
    The .par file to install. The heuristics outlined in the FUNCTIONS section above apply.

prefix
    This string will be prepended to all installation paths. If it isn't specified, the environment variable "PERL_INSTALL_ROOT" is used as a prefix.

Additionally, you can use several parameters to change the default installation destinations. You don't usually have to worry about this unless you are installing into a user-local directory. The following section outlines the parameter names and default settings:

  Parameter         From          To
  inst_lib          blib/lib      $Config{installsitelib} (*)
  inst_archlib      blib/arch     $Config{installsitearch}
  inst_script       blib/script   $Config{installscript}
  inst_bin          blib/bin      $Config{installbin}
  inst_man1dir      blib/man1     $Config{installman1dir}
  inst_man3dir      blib/man3     $Config{installman3dir}
  packlist_read                   $Config{sitearchexp}/auto/$name/.packlist
  packlist_write                  $Config{installsitearch}/auto/$name/.packlist

The "packlist_write" parameter is used to control where the .packlist file is written to. (Necessary for uninstallation.) The "packlist_read" parameter specifies a .packlist file to merge in if it exists.

Finally, you may specify a "custom_targets" parameter. Its value should be a reference to a hash of custom installation targets such as

  custom_targets => { 'blib/my_data' => '/some/path/my_data' }

You can use this to install the .par archives contents to arbitrary locations.

If only a single parameter is given, it is treated as the "dist" parameter.

  uninstall_par
Uninstalls all previously installed contents of a PAR distribution, using "ExtUtils::Install::uninstall".

Takes almost the same parameters as "install_par", but naturally, the installation target parameters do not apply. The only exception to this is the "packlist_read" parameter which specifies the .packlist file to read the list of installed files from. It defaults to "$Config::Config{installsitearch}/auto/$name/.packlist".

  sign_par
Digitally sign a PAR distribution using "gpg" or Crypt::OpenPGP, via Module::Signature.

  verify_par
Verify the digital signature of a PAR distribution using "gpg" or Crypt::OpenPGP, via Module::Signature.

Returns a boolean value indicating whether verification passed; $! is set to the return code of "Module::Signature::verify".

  merge_par
Merge two or more PAR distributions into one. First argument must be the name of the distribution you want to merge all others into. Any following arguments will be interpreted as the file names of further PAR distributions to merge into the first one.

  merge_par('foo.par', 'bar.par', 'baz.par')

This will merge the distributions "foo.par", "bar.par" and "baz.par" into the distribution "foo.par". "foo.par" will be overwritten! The original META.yml of "foo.par" is retained.

  remove_man
Remove the man pages from a PAR distribution. Takes one named parameter: dist which should be the name (and path) of the PAR distribution file. The calling conventions outlined in the "FUNCTIONS" section above apply.

The PAR archive will be extracted, stripped of all "man\d?" and "html" subdirectories and then repackaged into the original file.

  get_meta
Opens a PAR archive and extracts the contained META.yml file. Returns the META.yml file as a string.

Takes one named parameter: dist. If only one parameter is passed, it is treated as the dist parameter. (Have a look at the description in the "FUNCTIONS" section above.)

Returns undef if no PAR archive or no META.yml within the archive were found.

  parse_dist_name
First argument must be a distribution file name. The file name is parsed into distribution name, distribution version, architecture name, and perl version.

Returns the results as a list in the above order. If any or all of the above cannot be determined, returns undef instead of the undetermined elements.

Supported formats are:

Math-Symbolic-0.502-x86_64-linux-gnu-thread-multi-5.8.7

Math-Symbolic-0.502

The ".tar.gz" or ".par" extensions as well as any preceding paths are stripped before parsing.

This function is not exported by default.

  generate_blib_stub
Creates a blib/lib subdirectory in the current directory and prepares a META.yml with meta information for a new PAR distribution. First argument should be the name of the PAR distribution in a format understood by "parse_dist_name()". Alternatively, named arguments resembling those of "blib_to_par" are accepted.

After running "generate_blib_stub" and injecting files into the blib directory, you can create a PAR distribution using "blib_to_par". This function is useful for creating custom PAR distributions from scratch. (I.e. not from an unpacked CPAN distribution) Example:

  use PAR::Dist;
  use File::Copy 'copy';

  generate_blib_stub(
    name => 'MyApp', version => '1.00'
  );
  copy('MyApp.pm', 'blib/lib/MyApp.pm');
  blib_to_par(); # generates the .par file!

"generate_blib_stub" will not overwrite existing files.

SEE ALSO
PAR, ExtUtils::Install, Module::Signature, LWP::Simple

AUTHORS
Audrey Tang <cpan@audreyt.org> 2003-2006

Steffen Mueller <smueller@cpan.org> 2005-2006

PAR has a mailing list, <par@perl.org>, that you can write to; send an empty mail to <par-subscribe@perl.org> to join the list and participate in the discussion.

Please send bug reports to <bug-par@rt.cpan.org>.

COPYRIGHT
Copyright 2003, 2004, 2006 by Audrey Tang <autrijus@autrijus.org>.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

See <http://www.perl.com/perl/misc/Artistic.html>