How to unzip files in a Heroku Buildpack

Question

I'm writing a custom Heroku buildpack (heroku-buildpack-fantom) for Fantom, and as part of the compile script I've downloaded a .zip file (from a language vendor), but how do I unzip it?

unzip is not a recognised command.

gunzip exists but I can't use it to unzip .zip files.

What am I missing?

Answer 1

Even though (by default) Linux does not come pre-installed with unzip, the Heroku dyno does have a jar command. So the following works okay:

  > jar xf wotever.zip

Answer 2

Be sure to run the 'file' command on it. I got a .zip file from SourceForge that was actually bzip2 encoded and Heroku has both the bunzip2 decoder and the -j (--bzip2) option on tar to handle it.