OnWorks favicon

gem2deb - Online in the Cloud

Run gem2deb in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command gem2deb that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



gem2deb - converts Rubygems' .gem file into Debian package


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

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


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.


-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

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

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

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

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.

-h, --help
Displays gem2deb usage information.

-v, --version
Displays gem2deb version information.


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

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:

It contains all the files the gem contains.

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

Use gem2deb online using onworks.net services

Free Servers & Workstations

Download Windows & Linux apps

Linux commands