Ruin The assorted ramblings of Brendan Tobolaski

fpm

For many developers, the way that they deploy is by checking out a specific revision from version control. While some people consider that to be a bit of an anti-pattern, I think that is a fine way to deploy applications written in dynamic languages. In theory, you could do the same thing for compiled languages, it just doesnʼt work well in practice. This would require you to compile your application on every server during the deploy. While this is possible, its very inefficient and time consuming. A much better way to do this is to build your application and then distribute the resultant artifacts. The way that Iʼve chosen to do this is by building native packages, specifically debs.

Generating these debs arenʼt very difficult. It took me quite a bit of research to figure out what needed to be there (debianʼs packaging and Clemens Leeʼs package building HowTo guides were both hugely helpful). once you figure that out, its just a matter of creating the correct directory structure and then run it through dpkg-deb . Alright then, how do you make a similar rpm? Time to do some research, huh?

Why should any of this be required? Surely many other people have figured out what is required. One of them must have documented their knowledge somehow. The answer to both of these things is of course. Theres an awesome tool called fpm that creates packages of many different types from many different sources. Of course, it can package up files and directories into debs and rpms.

Iʼve known about fpm for quite some time. In fact, I knew about it before I started building debs by hand. As I mentioned, its not terribly difficult to use dpkg-deb to produce a deb. I also donʼt really like that fpm is written in ruby. While I think ruby is a fine language, getting it installed with everything that is needed to build native gem extensions is a pain. A pain that I didnʼt want to pay for a simple cli tool. It also requires a bit more setup than that to fully utilize. The rpm output requires the rpmbuild command to be installed and Iʼm sure that some of the other outputs require similar commands to be available. Iʼd love to see a similar tool compiled into a static binary but, Iʼve long given up on ever producing this tool for myself.

As I alluded to earlier, what prompted me to start using fpm was generating rpms. Iʼve since realized that I shouldnʼt have dragged my feet on it for so long. Instead of figuring out everything that is required to generate an rpm, I just used fpm: fpm -s dir -t rpm -v $VERSION -d libgmp10 ~/.local/bin=/usr/local/bin/. Of course, I can simply swap out the rpm with deb to generate a deb instead of an rpm. This ignores many of the fancier things that fpm can do. You can easily make native packages for gems, python modules, and cpan modules (to name a few). It also supports some more “exotic” formats such as self extracting scripts and OS X packages. Iʼve converted many of my deb building scripts to use fpm and Iʼll be using fpm for all of my packaging needs.