/ 
App-p5stack-0.004
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/ App::p5stack

NAME

App::p5stack - manage your dependencies and perl requirements locally

VERSION

version 0.004

SYNOPSIS

Warning: this tool is still under development and badly tested, use with care!

Manage your dependencies and perl requirements locally, by projects (directory).

# set up configuration in your application directory
$ cat > p5stack.yml
---
perl: 5.20.3
deps: dzil

# setup the environment
$ p5stack setup

# run your application
$ p5stack perl <application>

# execute an installed program for this environment
$ p5stack bin <program>

DESCRIPTION

p5stack is a tool that given a small set of configuration directives allows to quickly (in a single command) setup the required modules inside a local directory specific to this project. Including a specific perl version if required. This allows to constrain all the required elements to run your application to live inside the application directory. And thus not clashing to system wide perl installations.

Configuration files are written in YAML, an example configuration looks like:

---
perl: 5.20.3
deps: dzil

This tells p5stack that you want to use perl version 5.20.3, and to use dzil to find the required modules for the application. By default all perl versions are installed inside $HOME/.p5stack, and all the required modules are install in a .local directory. This way you can share perl releases installations, but have a local directory with the required modules for each project.

After setting up the environment with the required perl and modules using the setup command:

$ p5stack setup

You can run a command using the environment using:

$ p5stack perl <program>

Or execute a program installed by a module using:

$ p5stack bin <program>

You system perl and other possible installations remain unchanged.

The local installation of modules is done using App-cpanminus and local-lib.

EXAMPLES OF USE

Simple Example

Imagine a very simple project:

$ ls -A
dist.ini  ex1

which contains a script:

$ cat ex1
#!/usr/bin/perl

use Acme::123;

Acme::123->new->printnumbers;

that requires the Acme::123 module, as described in this simple dzil file:

$ cat dist.ini 
name = ex1

[Prereqs]
Acme::123 = 0

To setup the environment to run this using p5stack just run the tool with the setup command:

$ p5stack setup
[p5stack - Sep 28 23:58:19] Hammering setup ...
(...)

Since there is no configuration file for p5stack, by default the sytem perl is used. And a directory .local is created to install all the required modules. The list of required dependencies is gathered using dzil by default (or a cpanfile if available).

$ ls -A
.local  dist.ini  ex1

To run the simple application, just use the p5stack perl command:

$ p5stack perl ex1 
one 
two 
three 
(...)

Dancer Example

Dancer is a popular framework for building site. Creating a new project using Dancer can be done as:

$ dancer2 -a webapp
+ webapp
(...)

This will create a directory called webapp with a bunch of files inside. One of these files is a cpanfile that stores the required modules to run the bootstrap application. To setup this new environment to run the application just cd into the new directory and run:

$ cd webapp
webapp$ p5stack setup

By default p5stack will use your system perl, and will use the cpanfile to install in a .local directory inside your application the required dependencies to run the application.

You may require other perl version to use an application. You can write a configuration file, and define what version you require. For example:

$ cat > p5stack.yml
---
perl = 5.22.0

You need to run the setup again to install the new perl version and dependencies. After the setup is done, a perl 5.22.0 has been install in $HOME/.p5stack and all the require modules have been installed in .local inside your project.

We can run the application using:

webapp$ p5stack bin plackup bin/app.psgi 
HTTP::Server::PSGI: Accepting connections at http://0:5000/

COMMANDS

p5stack tool is executed using commands like:

$ p5stack <command> [args]

Available commands for p5stack are:

  • setup: build and setup the environment.

  • perl: run a perl interpreter.

  • bin: run a program installed by the setup in the environment.

  • cpanm: run cpanm in the context of your application environment.

  • help: show small help info.

CONFIGURATION

The currently available configuration attributes are:

  • perl defines the required perl version to run the application (eg. 5.20.3, 5.22.0); you can also use an absolute path, or the special keyword system which will use the system wide perl found (using which).

  • deps is used to define how to gather dependencies information, current available options are:

    • dzil: uses dzil listdeps to find out the list of requirements.

    • cpanfile: cpanm reads this file directly.

  • localperl if set, the required perl is installed in .local inside your directory project (not implemented yet).

You can write the configuration in a pstack.yml file in your project directory, have a $HOME/.p5stack/p5stack.yml configuration file, or use the environment variable P5STACKCFG to define where the configuration file is.

FUTURE WORK

  • Allow other options to set up local lib (eg. carton, DX).

  • More tests.

ACKNOWLEDGMENTS

Thank you to the authors and contributors of App-cpanminus and local-lib.

Inspired by The Haskell Tool Stack.

CONTRIBUTORS

Alberto Simões <ambs@cpan.org>

AUTHOR

Nuno Carvalho <smash@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2015 by Nuno Carvalho.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.