NAME
   App::cpanminus - get, unpack, build and install modules from CPAN

SYNOPSIS
       cpanm Module
       cpanm MIYAGAWA/Plack-1.0000.tar.gz
       cpanm ~/mydists/MyCompany-Framework-1.0.tar.gz
       cpanm http://example.com/MyModule-0.1.tar.gz
       cpanm http://github.com/miyagawa/Tatsumaki/tarball/master
       cpanm --interactive Task::Kensho

   Run `cpanm -h' for more options.

DESCRIPTION
   cpanminus is a script to get, unpack, build and install modules from
   CPAN.

   Why? It's dependency free, requires zero configuration, and stands alone
   -- but it's maintainable and extensible with plugins and friendly to
   shell scripting. When running, it requires only 10MB of RAM.

INSTALLATION
   There are Debian packages, RPMs, FreeBSD ports, and packages for other
   operation systems available. If you want to use the package management
   system, search for cpanminus and use the appropriate command to install.
   This makes it easy to install `cpanm' to your system without thinking
   about where to install, and later upgrade.

   If you want to build the latest from source,

       git clone git://github.com/miyagawa/cpanminus.git
       cd cpanminus
       perl Makefile.PL
       make install # or sudo make install if you're non root

   This will install `cpanm' to your bin directory like `/usr/local/bin'
   (unless you configured `INSTALL_BASE' with local::lib), so you might
   need to sudo. Later you can say `cpanm --self-upgrade --sudo' to upgrade
   to the latest version.

   Otherwise,

       cd ~/bin
       wget http://xrl.us/cpanm
       chmod +x cpanm
       # edit shebang if you don't have /usr/bin/env

   just works, but be sure to grab the new version manually when you
   upgrade (`--self-upgrade' might not work).

DEPENDENCIES
   perl 5.8 or later (Actually I believe it works with pre 5.8 too but I
   haven't tested this).

   *   'tar' executable (bsdtar or GNU tar version 1.22 are rcommended) or
       Archive::Tar to unpack files.

   *   C compiler, if you want to build XS modules.

   And optionally:

   *   make, if you want to reliably install MakeMaker based modules

   *   Module::Build (core in 5.10) to install Build.PL based modules

PLUGINS
   WARNING: plugin API is not stable so this feature is turned off by
   default for now. To enable plugins you have to be savvy enough to look
   at the build.log or read the source code to see how :)

   The cpanminus core is a compact and simple 1000 lines of code (with some
   embedded utilities and documents) but can be extended by writing
   plugins. Plugins are flat perl scripts placed inside `~/.cpanm/plugins'.
   You can copy (or symlink, if you're a developer) a plugin file to the
   directory to enable plugins. Delete the file or symlink to disable it.

   See the `plugins/' directory in the git repository
   http://github.com/miyagawa/cpanminus for the list of available and
   sample plugins.

QUESTIONS
 Another CPAN installer?
   OK, the first motivation was this: the CPAN shell runs out of memory (or
   swaps heavily and gets really slow) on Slicehost/linode's most
   affordable plan with only 256MB RAM. Should I pay more to install perl
   modules from CPAN? I don't think so.

 But why a new client?
   First of all, I have no intention to dis CPAN or CPANPLUS developers.
   Don't get me wrong. They're great tools I've used for *literally* years
   (you know how many modules I have on CPAN, right?). I really respect
   their efforts of maintaining the most important tools in the CPAN
   toolchain ecosystem.

   However, for less experienced users (mostly from outside the Perl
   community), or even really experienced Perl developers who know how to
   shoot themselves in their feet, setting up the CPAN toolchain often
   feels like yak shaving, especially when all they want to do is just
   install some modules and start writing code.

   In particular, here are the few issues I've observed:

   *   They ask too many questions and do not provide enough sane defaults.
       A normal user doesn't (and shouldn't have to) know what's the right
       answer for the question `Parameters for the 'perl Build.PL' command?
       []'

   *   They provide very noisy output by default.

   *   They fetches and rebuild their indexes almost every day, and this
       takes time.

   *   ... and they hog 200MB of memory and thrashes/OOMs on my 256MB VPS

   cpanminus is designed to be very quiet (but logs all output to
   `~/.cpanm/build.log') and to pick the sanest possibledefaults without
   asking any questions -- to *just work*.

   Note that most of these problems with existing tools are rare, or are
   just overstated. They might already be fixed, or can be configured to
   work nicer. For instance, the latest CPAN.pm dev release has a much
   better first time configuration experience than ever before.

   I know there's a reason for them to have many options and questions,
   because they're meant to work everywhere for everybody.

   Of course I should have contributed back to CPAN/CPANPLUS instead of
   writing a new client, but CPAN.pm is nearly impossible (for anyone other
   than andk or xdg) to maintain (that's why CPANPLUS was born, right?) and
   CPANPLUS is a huge beast for me to start working on.

 Are you on drugs?
   Yeah, I think my brain has been damaged since I looked at PyPI,
   gemcutter, pip and rip. They're quite nice and I really wanted something
   as nice for CPAN which I love.

 How does this thing work?
   Imagine you don't have CPAN or CPANPLUS. You search for a module on the
   CPAN search site, download a tarball, unpack it and then run `perl
   Makefile.PL' (or `perl Build.PL'). If the module has dependencies you
   probably have to resolve those dependencies by hand before doing so.
   Then you run the unit tests and `make install' (or `./Build install').

   cpanminus automates that.

 Zero-conf? How does this module get/parse/update the CPAN index?
   It queries the CPAN Meta DB site running on Google AppEngine at
   http://cpanmetadb.appspot.com/. The site is updated every hour to
   reflect the latest changes from fast syncing mirrors. The script then
   also falls back to the site http://search.cpan.org/. I've been talking
   to and working with with the QA/toolchain people for building a more
   reliable CPAN DB website.

   Fetched files are unpacked in `~/.cpanm'. You can configure this with
   the `PERL_CPANM_HOME' environment variable.

 Where does this install modules to? Do I need root access?
   It installs to wherever ExtUtils::MakeMaker and Module::Build are
   configured to (via `PERL_MM_OPT' and `MODULEBUILDRC'). So if you're
   using local::lib, then it installs to your local perl5 directory.
   Otherwise it installs to the siteperl directory.

   cpanminus at a boot time checks whether you have configured local::lib,
   or have the permission to install modules to the sitelib directory. If
   neither, it automatically sets up local::lib compatible installation
   path in a `perl5' directory under your home directory. To avoid this,
   run the script as the root user or with `--sudo' option.

   This local::lib automatic integration is still considered alpha and in
   the work -- more bootstrapping is under development. Stay tuned.

 Does this really work?
   I tested installing MojoMojo, Task::Kensho, KiokuDB, Catalyst, Jifty and
   Plack using cpanminus and the installations including dependencies were
   mostly successful. More than *half of CPAN* behaves really nicely and
   appears to work.

   However, there might be some distributions that will miserably fail,
   because of nasty edge cases. Here are some examples:

   *   Packages uploaded to PAUSE in 90s which don't live under the
       standard `authors/id/A/AA' directory hierarchy.

   *   Distributions with a `Makefile.PL' or `Build.PL' that asks you
       questions without using `prompt' function. However cpanminus has a
       mechanism to kill those questions with a timeout, and you can always
       say `--interactive' to make the configuration interactive.

   *   Distributions that do not shipped with `META.yml' file but do
       require some specific version of toolchain for configuration.

   *   Distributions that test a SIGNATURE in the `*.t' unit tests and has
       `MANIFEST.SKIP' file in the distribution at the same time. The
       intent of signature testing is to provide some degree of security,
       but running it in unit tests is too late as it occurs *after*
       running `Makefile.PL'. cpanminus has a `verify_signature' plugin to
       verify the dist before configurations.

   *   Distributions that have a `META.yml' file that is encoded in YAML
       1.1 format using YAML::XS. This will be eventually solved once we
       move to `META.json'.

   cpanminus intends to work for 99.9% of modules on CPAN for 99.9% of
   people. It may not be perfect, but it should just work in most cases.

   If this tool doesn't work for your very rare environment, then I'm
   sorry, but you should use CPAN or CPANPLUS, or build and install modules
   manually.

 That sounds fantastic. Should I switch to this from CPAN(PLUS)?
   If you have CPAN or CPANPLUS working then you may want to keep using
   CPAN or CPANPLUS in the longer term, but I hope this can be a quite
   handy alternative to them for people in other situations. And
   apparently, many people love (at least the idea of) this software :)

COPYRIGHT
   Copyright 2010- Tatsuhiko Miyagawa

   The standalone executable contains the following modules embedded.

   Parse::CPAN::Meta Copyright 2006-2009 Adam Kennedy
   local::lib Copyright 2007-2009 Matt S Trout
   HTTP::Lite Copyright 2000-2002 Roy Hopper, 2009 Adam Kennedy

LICENSE
   Same as Perl.

CREDITS
 CONTRIBUTORS
   Patches and code improvements were contributed by:

   Goro Fuji, Kazuhiro Osawa, Tokuhiro Matsuno, Kenichi Ishigaki, Ian
   Wells, Pedro Melo, Masayoshi Sekimura, Matt S Trout, squeeky, horus and
   Ingy dot Net.

 ACKNOWLEDGEMENTS
   Bug reports, suggestions and feedbacks were sent by, or general
   acknowledgement goes to:

   Jesse Vincent, David Golden, Andreak Koenig, Jos Boumans, Chris
   Williams, Adam Kennedy, Audrey Tang, J. Shirley, Chris Prather, Jesse
   Luehrs, Marcus Ramberg, Shawn M Moore, chocolateboy, Chirs Nehren,
   Jonathan Rockway, Leon Brocard, Simon Elliott, Ricardo Signes, AEvar
   Arnfjord Bjarmason, Eric Wilhelm, Florian Ragwitz and xaicron.

COMMUNITY
   http://github.com/miyagawa/cpanminus - source code repository, issue
   tracker
   irc: - discussions about Perl toolchain. I'm there.

NO WARRANTY
   This software is provided "as-is," without any express or implied
   warranty. In no event shall the author be held liable for any damages
   arising from the use of the software.

SEE ALSO
   CPAN CPANPLUS pip

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