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Building RPMs from Ruby gems

Update: see my recent post describing a better way to do this.

I often need to deploy Ruby gems across many CentOS servers. I prefer to use the native OS package management tools (rpm + yum) rather than using Ruby gems.

Here’s how to build RPMs from Ruby gems using gem2rpm.

I am assuming you have the necessary build tools installed (if not, yum install rpmdevtools) and have already created an RPM build environment, eg:

~/rpmbuild|-- BUILD|-- RPMS|-- SOURCES|-- SPECS`-- SRPMS

First, make sure gem2rpm is installed:

yum install rubygem-gem2rpm

Then, grab the gem you want to convert to an RPM:

cd ~/rpmbuild/SOURCESgem fetch capistrano

This will dump the gem file in the current directory, in this case: capistrano-2.5.14.gem.

Next, create a spec file:

gem2rpm capistrano-2.5.14.gem  > ../SPECS/rubygem-capistrano.spec

Finally, build the RPM(s):

rpmbuild -ba ../SPECS/rubygem-capistrano.spec
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