MiniPortile

This documents versions 2 and up, for which the require file was renamed to mini_portile2. For mini_portile versions 0.6.x and previous, please visit the v0.6.x branch.

• Documentation: http://www.rubydoc.info/github/flavorjones/mini_portile
• Source Code: https://github.com/flavorjones/mini_portile
• Bug Reports: https://github.com/flavorjones/mini_portile/issues

This project is a minimalistic implementation of a port/recipe system for developers.

Because “Works on my machine” is unacceptable for a library maintainer.

Not Another Package Management System

mini_portile2 is not a general package management system. It is not aimed to replace apt, macports or homebrew.

It’s intended primarily to make sure that you, as the developer of a library, can reproduce a user’s dependencies and environment by specifying a specific version of an underlying dependency that you’d like to use.

So, if a user says, “This bug happens on my system that uses libiconv 1.13.1”, mini_portile2 should make it easy for you to download, compile and link against libiconv 1.13.1; and run your test suite against it.

This scenario might be simplified with something like this:

rake compile LIBICONV_VERSION=1.13.1

(For your homework, you can make libiconv version be taken from the appropriate ENV variables.)

Sounds easy, but where’s the catch?

At this time mini_portile2 only supports autoconf- or configure-based projects. (That is, it assumes the library you want to build contains a configure script, which all the autoconf-based libraries do.)

As of v2.2.0, there is experimental support for CMake-based projects. We welcome your feedback on this, particularly for Windows platforms.

How to use (for autoconf projects)

Now that you know the catch, and you’re still reading this, here is a quick example:

gem "mini_portile2", "~> 2.0.0" # NECESSARY if used in extconf.rb. see below.
require "mini_portile2"
recipe = MiniPortile.new("libiconv", "1.13.1")
recipe.files = ["http://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.13.1.tar.gz"]
recipe.cook
recipe.activate

The gem version constraint makes sure that your extconf.rb is protected against possible backwards-incompatible changes to mini_portile2. This constraint is REQUIRED if you’re using mini_portile2 within a gem installation process (e.g., extconf.rb), because Bundler doesn’t enforce gem version constraints at install-time (only at run-time.

#cook will download, extract, patch, configure and compile the library into a namespaced structure.

#activate ensures GCC will find this library and prefer it over a system-wide installation.

How to use (for cmake projects)

Same as above, but instead of MiniPortile.new, call MiniPortileCMake.new.

Directory Structure Conventions

mini_portile2 follows the principle of convention over configuration and established a folder structure where is going to place files and perform work.

Take the above example, and let’s draw some picture:

mylib
  |-- ports
  |   |-- archives
  |   |   `-- libiconv-1.13.1.tar.gz
  |   `-- <platform>
  |       `-- libiconv
  |           `-- 1.13.1
  |               |-- bin
  |               |-- include
  |               `-- lib
  `-- tmp
      `-- <platform>
          `-- ports

In above structure, <platform> refers to the architecture that represents the operating system you’re using (e.g. i686-linux, i386-mingw32, etc).

Inside the platform folder, mini_portile2 will store the artifacts that result from the compilation process. The library is versioned so you can keep multiple versions around on disk without clobbering anything.

archives is where downloaded source files are cached. It is recommended you avoid trashing that folder to avoid downloading the same file multiple times (save bandwidth, save the world).

tmp is where compilation is performed and can be safely discarded.

Use the recipe’s #path to obtain the full path to the installation directory:

recipe.cook
recipe.path # => /home/luis/projects/myapp/ports/i686-linux/libiconv/1.13.1

How can I combine this with my compilation task?

In the simplest case, your rake compile task will depend on mini_portile2 compilation and most important, activation.

Example:

task :libiconv do
  recipe = MiniPortile.new("libiconv", "1.13.1")
  recipe.files << {
    url: "http://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.13.1.tar.gz"],
    sha256: "55a36168306089009d054ccdd9d013041bfc3ab26be7033d107821f1c4949a49"
  }
  checkpoint = ".#{recipe.name}-#{recipe.version}.installed"

  unless File.exist?(checkpoint)
    recipe.cook
    touch checkpoint
  end

  recipe.activate
end

task :compile => [:libiconv] do
  # ... your library's compilation task ...
end

The above example will:

• download and verify integrity the sources only once
• compile the library only once (using a timestamp file)
• ensure compiled library is activated
• make the compile task depend upon compiled library activation

As an exercise for the reader, you could specify the libiconv version in an environment variable or a configuration file.

Download verification

MiniPortile supports HTTPS, HTTP, FTP and FILE sources for download. The integrity of the downloaded file can be verified per hash value or PGP signature. This is particular important for untrusted sources (non-HTTPS).

Hash digest verification

MiniPortile can verify the integrity of the downloaded file per SHA256, SHA1 or MD5 hash digest.

  recipe.files << {
    url: "http://your.host/file.tar.bz2",
    sha256: "<32 byte hex value>",
  }

PGP signature verification

MiniPortile can also verify the integrity of the downloaded file per PGP signature.

  public_key = <<-EOT
    -----BEGIN PGP PUBLIC KEY BLOCK-----
    Version: GnuPG v1

    mQENBE7SKu8BCADQo6x4ZQfAcPlJMLmL8zBEBUS6GyKMMMDtrTh3Yaq481HB54oR
    [...]
    -----END PGP PUBLIC KEY BLOCK-----
  EOT

  recipe.files << {
    url: "http://your.host/file.tar.bz2",
    gpg: {
      key: public_key,
      signature_url: "http://your.host/file.tar.bz2.sig"
    }
  }

Please note, that the gpg executable is required to verify the signature. It is therefore recommended to use the hash verification method instead of PGP, when used in extconf.rb while gem install.

Native and/or Cross Compilation

The above example covers the normal use case: compiling dependencies natively.

MiniPortile also covers another use case, which is the cross-compilation of the dependencies to be used as part of a binary gem compilation.

It is the perfect complementary tool for rake-compiler and its cross rake task.

Depending on your usage of rake-compiler, you will need to use host to match the installed cross-compiler toolchain.

Please refer to the examples directory for simplified and practical usage.

Supported Scenarios

As mentioned before, MiniPortile requires a GCC compiler toolchain. This has been tested against Ubuntu, OSX and even Windows (RubyInstaller with DevKit)

License

This library is licensed under MIT license. Please see LICENSE.txt for details.