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9.2. RubyGems spec file conventions

A RubyGems spec file must meet the following conventions:

  • The file contains a definition of %{gem_name}, which is the name from the gem’s specification.
  • The source of the package must be the full URL to the released gem archive.
  • The version of the package must be the gem’s version.

  • The file contains the following BuildRequires: directive: 

    BuildRequires: rubygems-devel

    The rubygems-devel package contains macros needed for a build.

  • The file does not contain any additional rubygem(foo) Requires or Provides directives because these directives are autogenerated from the gem metadata.

9.2.1. RubyGems spec file example
リンクのコピー

The following is the RubyGems-specific part of an example spec file for building gems. The remaining part of the spec file follows the generic guidelines.

A RubyGems-specific part of an example spec file

%prep
%setup -q -n  %{gem_name}-%{version}

# Modify the gemspec if necessary
# Also apply patches to code if necessary
%patch 0 -p1

%build
# Create the gem as gem install only works on a gem file
gem build ../%{gem_name}-%{version}.gemspec

# %%gem_install compiles any C extensions and installs the gem into ./%%gem_dir
# by default, so that we can move it into the buildroot in %%install
%gem_install

%install
mkdir -p %{buildroot}%{gem_dir}
cp -a ./%{gem_dir}/* %{buildroot}%{gem_dir}/

# If there were programs installed:
mkdir -p %{buildroot}%{_bindir}
cp -a ./%{_bindir}/* %{buildroot}%{_bindir}

# If there are C extensions, copy them to the extdir.
mkdir -p %{buildroot}%{gem_extdir_mri}
cp -a .%{gem_extdir_mri}/{gem.build_complete,*.so} %{buildroot}%{gem_extdir_mri}/

9.2.2. RubyGems spec file directives
リンクのコピー

The following are the specifics of particular items in the RubyGems-specific part of the spec file.

Expand
表9.1 RubyGems' spec directives specifics
DirectiveRubyGems specifics

%prep

RPM can directly unpack gem archives. The %setup -n %{gem_name}-%{version} macro provides the directory into which the gem is unpacked. At the same directory level, the %{gem_name}-%{version}.gemspec file is automatically created. You can use this file to perform the following actions:

  • Modify the .gemspec file
  • Apply patches to the code.

%build

This section includes commands for building the software into machine code. The %gem_install macro operates only on gem archives. Therefore, you must first re-create the archive by using the gem build ../%{gem_name}-%{version}.gemspec command. The recreated gem file is then used by %gem_install to build and install the gem code into the default ./%{gem_dir} temporary directory. Before being installed, the built sources are placed into a temporary directory that is created automatically.

%install

The installation is performed into the %{buildroot} hierarchy. You can create the necessary directories and then copy the installed code from the temporary directories into the %{buildroot} hierarchy. If the gem creates shared objects, they are moved into the architecture-specific %{gem_extdir_mri} path.

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