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Packaging.md
# Introduction This document describes how packagers can package Phusion Passenger binaries for their operating system. Phusion Passenger can be configured in 2 ways, the "originally packaged" configuration where everything is in the same directory, and the "natively packaged" configuration where files are scattered across the filesystem, e.g. in a FHS-compliant configuration. This document describes how you can configure Phusion Passenger to locate its own files when they're scattered across the filesystem. Phusion Passenger files are also called _assets_ in this document. ## Originally packaged This is the configuration you get when you checkout Phusion Passenger from git, when you install Phusion Passenger from a gem or when you extract it from a tarball. All the original files are stored in a single directory tree, which we call the _source root_. The git repository, gems and tarballs do not come with any binaries; they have to be compiled by the user. Phusion Passenger looks for binaries in, and (if the user initiates the compilation process) stores binaries in, the following directories: * Normally, binaries are to be located in the `buildout` subdirectory under the source root. * Phusion Passenger Standalone does things a little differently. Binaries are to be located in one of the following directories, whichever it finds first: - `~/.passenger/standalone/<VERSION>/<TYPE-AND-ARCH>` (a) - `/var/lib/passenger-standalone/<VERSION-AND-ARCH>` (b) If neither directories exist, then Passenger Standalone compiles the binaries and stores them in (b) (when running as root) or in (a). It still looks for everything else (like the .rb files) in the source root. ## Natively packaged Phusion Passenger is packaged, usually (but not necessarily) through a DEB or RPM package. This configuration comes not only with all necessary binaries, but also with some (but not all) source files. This is because when you run Phusion Passenger with a different Ruby interpreter than the packager intended, Phusion Passenger must be able to compile a new Ruby extension for that Ruby interpreter. This configuration does not however allow compiling against a different Apache version than the packager intended (but does allow compiling against a different Nginx version). In this configuration, files can be scattered anywhere throughout the filesystem. This way Phusion Passenger can be packaged in an FHS-compliant way. The exact locations of the different types of files can be specified through a _location configuration file_. The existance and usage of a location configuration file does not automatically imply that Phusion Passenger is natively packaged. If Phusion Passenger needs to have a new Ruby extension compiled, then it will store that in `~/.passenger/native_support/<VERSION>/<ARCH>`. # The location configuration file The Phusion Passenger administration tools, such as `passenger-status`, look for a location configuration file in the following places, in the given order: * The environment variable `$PASSENGER_LOCATION_CONFIGURATION_FILE`. * `<RUBYLIBDIR>/phusion_passenger/locations.ini`, where <LIBDIR> is the Ruby library directory that contains phusion_passenger.rb. For example, `/usr/lib/ruby/1.9.0/phusion_passenger/locations.ini`. * `~/.passenger/locations.ini` * `/etc/phusion-passenger/locations.ini` If it cannot find a location configuration file, then it assumes that Phusion Passenger is originally packaged. If a location configuration file is found then the configuration is determined by the `natively_packaged` option in the location configuration file, which can be either "true" or "false". The Apache module and the Nginx module expect `PassengerRoot`/`passenger_root` to refer to either a directory or a file. If the value refers to a directory, then it assumes that Phusion Passenger is originally packaged, where the source root is the specified directory. If the value refers to a file, then it will use it as the location configuration file, and the configuration depends on the `natively_packaged` setting. The location configuration file is an ini file that looks as follows: [locations] natively_packaged=true bin_dir=/usr/bin support_binaries_dir=/usr/lib/phusion-passenger/support-binaries lib_dir=/usr/lib/phusion-passenger helper_scripts_dir=/usr/share/phusion-passenger/helper-scripts resources_dir=/usr/share/phusion-passenger include_dir=/usr/share/phusion-passenger/include doc_dir=/usr/share/doc/phusion-passenger ruby_libdir=/usr/lib/ruby/vendor_ruby apache2_module_path=/usr/lib/apache2/modules/mod_passenger.so ruby_extension_source_dir=/usr/share/phusion-passenger/ruby_extension_source nginx_module_source_dir=/usr/share/phusion-passenger/ngx_http_passenger_module All keys except fo `natively_packaged` specify the locations of assets and asset directories. The "Asset types" section provides a description of all asset types. Thus, if you're packaging Phusion Passenger, then we recommend the following: * Put a locations.ini file in `<RUBYLIBDIR>/phusion_passenger/locations.ini` and set `PassengerRoot`/`passenger_root` to that filename. We don't recommend using `~/.passenger` or `/etc/phusion-passenger` because if the user wants to install a different Phusion Passenger version alongside the one that you've packaged, then that other version will incorrectly locate your packaged files instead of its own files. * Always set `natively_packaged` to "true". The "false" value is used internally for implementing Phusion Passenger Standalone and should never be used by packagers. # The Phusion Passenger Ruby libraries ## phusion_passenger.rb The Phusion Passenger administration tools are written in Ruby. So the first thing they do is trying to load `phusion_passenger.rb`, which is the source file responsible for figuring out where all the other Phusion Passenger files are. It tries to look for phusion_passenger.rb in `<OWN_DIRECTORY>/../src/ruby_supportlib` where `<OWN_DIRECTORY>` is the directory that the tool is located in. If phusion_passenger.rb is not there, then it tries to load it from the normal Ruby load path. ## Ruby extension The Phusion Passenger loader scripts try to load the Phusion Passenger Ruby extension (`passenger_native_support.so`) from the following places, in the given order: * If Phusion Passenger is originally packaged, it will look for the Ruby extension in `<SOURCE_ROOT>/libout/ruby/<ARCH>`. Otherwise, this step is skipped. * The Ruby library load path. * `~/.passenger/native_support/<VERSION>/<ARCH>` If it cannot find the Ruby extension in any of the above places, then it will attempt to compile the Ruby extension and store it in `~/.passenger/native_support/<VERSION>/<ARCH>`. ## Conclusion for packagers If you're packaging Phusion Passenger then you should put both phusion_passenger.rb and `passenger_native_support.so` somewhere in the Ruby load path, or make sure that that directory is included in the `$RUBYLIB` environment variable. You cannot specify a custom directory though the location configuration file. # Asset types Throughout the Phusion Passenger codebase, we refer to all kinds of assets. Here's a list of all possible assets and asset directories. * `source_root` When Phusion Passenger is originally packaged, this refers to the directory that contains the entire Phusion passenger source tree. Not available when natively packaged. * `bin_dir` A directory containing administration binaries and scripts and like `passenger-status`; tools that the user may directly invoke on the command line. Value when originally packaged: `<SOURCE_ROOT>/bin` * `support_binaries_dir` A directory that contains (platform-dependent) binaries that Phusion Passenger uses, but that should not be directly invoked from the command line. Things like PassengerAgent are located here. Value when originally packaged: - Normally: `<SOURCE_ROOT>/buildout/support-binaries` - Passenger Standalone: `~/.passenger/standalone/<VERSION>/support-<ARCH>` * `helper_scripts_dir` A directory that contains non-binary scripts that Phusion Passenger uses, but that should not be directly invoked from the command line. Things like rack-loader.rb are located here. Value when originally packaged: `<SOURCE_ROOT>/helper-scripts` * `resources_dir` A directory that contains non-executable, platform-independent resource files that the user should not directly access, like error page templates and configuration file templates. Value when originally packaged: `<SOURCE_ROOT>/resources`. * `doc_dir` A directory that contains documentation. Value when originally packaged: `<SOURCE_ROOT>/doc`. * `include_dir` A directory that contains the Phusion Passenger header files that are necessary for compiling Nginx. Value when originally packaged: `<SOURCE_ROOT>/src` * `lib_dir` A directory that contains the Phusion Passenger library files, e.g. libboost_oxt.a and various .o files. Value when originally packaged: `<SOURCE_ROOT>/buildout` * `ruby_libdir` A directory that contains the Phusion Passenger Ruby library files. Note that the Phusion Passenger administration tools still locate phusion_passenger.rb as described in the section "The Phusion Passenger Ruby libraries", irrespective of the value of this key in the location configuration file. The value is only useful to non-Ruby Phusion Passenger code. Value when originally packaged: `<SOURCE_ROOT>/src/ruby_supportlib`. * `apache2_module_path` The filename of the Apache 2 module, or the filename that the Apache 2 module will be stored after it's compiled. Used by `passenger-install-module` to print an example configuration snippet. Value when originally packaged: `<SOURCE_ROOT>/buildout/apache2/mod_passenger.so`. * `ruby_extension_source_dir` The directory that contains the source code for the Phusion Passenger Ruby extension. Phusion Passenger uses these sources to build a Ruby extension, when it detects that the user is using a new Ruby interpreter for which no Ruby extension has been compiled. Value when originally packaged: `<SOURCE_ROOT>/src/ruby_native_extension`. * `nginx_module_source_dir` The directory that contains the source code for the Phusion Passenger Nginx module. passenger-install-nginx-module uses these sources to build Nginx with Phusion Passenger support. Value when originally packaged: `<SOURCE_ROOT>/src/nginx_module`. Optional fields: * `build_system_dir` The directory that contains the Phusion Passenger main Rakefile, used for compiling the Apache module and the agent executable. This field is only present if Phusion Passenger is compilable. Native packages usually do not have this field because they ship a precompiled Apache module and a precompiled agent executable. Value when originally packaged: `<SOURCE_ROOT>` * `download_cache_dir` The directory that contains cached downloaded agent executables. Its main use case is to speed up agent executable downloading when Phusion Passenger is installed from a Ruby gem. When the user installs the gem, a script is invoked which downloads agent executables from the Phusion Passenger websites. The downloaded files are stored in this directory. Then later, when the user runs `passenger start` or any other command which requires the agent executable, the executable will be copied from this cache directory instead of downloaded. Native packages ship precompiled executables, so they can omit this field. Value when originally packaged: `<SOURCE_ROOT>/download_cache` # Vendoring of libraries Phusion Passenger vendors libev and libuv in order to make installation easier for users on operating systems without proper package management, like OS X. If you want Phusion Passenger to compile against the system-provided libev and/or libuv instead, then set the following environment variables before compiling: * `export USE_VENDORED_LIBEV=no` * `export USE_VENDORED_LIBUV=no` Note that we require at least libev 4.11 and libuv 1.4.2. # Generating gem and tarball Use the following commands to generate a gem and tarball, in which Phusion Passenger is originally packaged and without any binaries: rake package:gem rake package:tarball The files will be stored in `pkg/`. # Fakeroot You can generate a fakeroot with the command `rake fakeroot`. This will generate an FHS-compliant directory tree in `pkg/fakeroot`, which you can directly package or with minor modifications. The fakeroot even contains a location configuration file.
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