* guix/build/ruby-build-system.scm (build): Move extraction from here ...
(extract-gemspec): ... to here. New variable.
(first-gemspec): New variable.
(%standard-phases): Add 'extract-gemspec' phase.
Previously paths to the GEM_HOME of certain Ruby packages were
hard-coded, so packages failed to build when Ruby was updated to 2.3.0.
* guix/build/ruby-build-system.scm (gem-home): New procedure.
* gnu/packages/ruby.scm (ruby-metaclass, ruby-instantiator,
ruby-introspection, ruby-mocha, ruby-minitest-tu-shim): Use it.
The .gem file stored in GEM_HOME after install is both redundant and an
archive that stores timestamped files which makes builds
non-deterministic, so delete it after 'gem install'.
* guix/build/ruby-build-system.scm (install): Remove cached gem after
install.
Previously, the Ruby build system only knew how to work with gem archives,
which made it difficult to build unreleased gems from a Git repository or
released gems in tarball form.
* gnu/build/ruby-build-system.scm (gnu:unpack, gem-archive?): New procedures.
(unpack): Use GNU build system unpack phase for non-gem sources.
(build): Rebuild the gemspec iff the source is a gem archive.
* guix.texi ("ruby-build-system"): Mention that tarballs and directories are
acceptable.
Having the hash of the source gem in the source directory file name proved to
be problematic when running the test suite for the 'pg' gem that creates
UNIX-domain sockets in the source directory and exceeded the 108 character
limit on GNU/Linux systems.
* guix/build/ruby-build-system.scm (unpack): Rename unpacked gem directory to
"gem".
Ben Woodcroft