NAME

       gem2deb - converts Rubygems' .gem file into Debian package

SYNOPSIS

       gem2deb [OPTIONS] GEMNAME (to download the gem with gem fetch)

       gem2deb [OPTIONS] GEMFILE (to use a local .gem file)

DESCRIPTION

       gem2deb converts the gem into a Debian source package, and then will attempt to build it.
       The process is made of several steps.

       First, gem2deb converts the gem file to a tar.gz archive containing a metadata.yml file
       with the Gem specification. This is equivalent to what gem2tgz does.

       Then, gem2deb unpacks the tar.gz archive and prepares a Debian source package, guess many
       of the defaults from the files included in the archive, or the Gem specification. This is
       equivalent to what dh-make-ruby does.  gem2deb cannot determine all parameters for obvious
       reasons. It is recommended to search for the "FIXME" string in the debian/ directory.  The
       generated Debian source package uses dh_ruby to build the package.

       Finally, gem2deb tries to build the source and binary packages using dpkg-buildpackage.

OPTIONS

       -t, --only-tarball
           Stop after creating the tar.gz archive.

       -s, --only-source-dir
           Stop after preparing the Debian source package directory (do not attempt to build the
           package).

       -S, --only-debian-source
           Only build a Debian source package (do not build binary packages).

       -d, --no-check-builddeps
           Do not check build dependencies when building the package. Equivalent to the options
           with the same in dpkg-buildpackage(1).

       -p PACKAGE, --package PACKAGE
           Specify package name (default: ruby-*).  Passed to dh-make-ruby. See dh-make-ruby(1).

       -g, --git
           Import the resulting source package, if any, to a git repository under the current
           directory. The git repository will be named after the source package (i.e. it is
           influenced by --package).

           Note that --only-tarball or --only-source-dir will prevent this, since they make
           gem2deb stop early.

           The import uses gbp import-dsc --pristine-tar (see gbp-import-dsc(1)), and thus git-
           buildpackage and pristine-tar need to be installed for this to work.

       --purge
           After building the package, remove all files files that were produced by gem2deb. This
           includes source tarballs, Debian package artifacts (.dsc, .deb, .changes etc), and
           even the source directory. This is useful for example when used in conjunction with
           --git.

       --ruby-versions VERSIONS
           Ruby versions to build the package for (default: all).  Passed to dh-make-ruby. See
           dh-make-ruby(1).

       --no-wnpp-check
           Prevents dh-make-ruby to check wnpp reports to get the number of a possible ITP
           (intend to package) bug report. By default, dh-make-ruby does check these reports,
           which requires an Internet access.

       -o, --offline
           Prevents dh-make-ruby from accessing the internet at all.

       -h, --help
           Displays gem2deb usage information.

       -v, --version
           Displays gem2deb version information.

HOW THE .GEM -> .TGZ CONVERSION WORKS

       A gem named mygem-0.1.0.gem is converted in a tarball with (approximately) the following
       steps:

         mkdir mygem-0.1.0
         cd mygem-0.1.0
         tar xfm /absolute/path/to/mygem-0.1.0.gem
         tar xzfm data.tar.gz
         zcat metadata.gz > metadata.yml
         rm -f data.tar.gz metadata.gz
         cd ..
         tar czf mygem-0.1.0.tar.gz mygem-0.1.0
         rm -rf mygem-0.1.0

       The generated tarball has the following properties:

       Files
           It contains all the files the gem contains.

       Metadata
           It contains the gem metadata in a file named ``metadata.yml`` inside the mygem-0.1.0
           directory.

SEE ALSO

       dh_ruby(1)

COPYRIGHT AND AUTHORS

       Copyright (c) 2011, Lucas Nussbaum <lucas@debian.org>

       This program is free software: you can redistribute it and/or modify it under the terms of
       the GNU General Public License as published by the Free Software Foundation, either
       version 3 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
       without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
       See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program.
       If not, see <http://www.gnu.org/licenses/>.

                                            2022-07-30                                 GEM2DEB(1)