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README.md

Heroku buildpack: Scala Build Status

This is a Heroku buildpack for Scala apps. It uses sbt 0.11.0+.

Usage

Example usage:

$ ls
Procfile build.sbt project src

$ heroku create --buildpack https://github.com/heroku/heroku-buildpack-scala.git

$ git push heroku master
...
-----> Heroku receiving push
-----> Scala app detected
-----> Building app with sbt
-----> Running: sbt compile stage

The buildpack will detect your app as Scala if it has the project/build.properties and either .sbt or .scala based build config. It vendors a version of sbt and your popluated .ivy/cache into your slug. The .ivy2 directory will be cached between builds to allow for faster build times.

Clean builds

In some cases, builds need to clean artifacts before compiling. If a clean build is necessary, configure builds to perform clean by setting SBT_CLEAN=true:

$ heroku config:set SBT_CLEAN=true
Setting config vars and restarting example-app... done, v17
SBT_CLEAN: true

All subsequent deploys will use the clean task. To remove the clean task, unset SBT_CLEAN:

$ heroku config:unset SBT_CLEAN
Unsetting SBT_CLEAN and restarting example-app... done, v18

Hacking

To use this buildpack, fork it on Github. Push up changes to your fork, then create a test app with --buildpack <your-github-url> and push to it.

For example, to reduce your slug size by not including the .ivy2/cache, you could add the following.

for DIR in $CACHED_DIRS ; do
rm -rf $CACHE_DIR/$DIR
mkdir -p $CACHE_DIR/$DIR
cp -r $DIR/.  $CACHE_DIR/$DIR
# The following 2 lines are what you would add
echo "-----> Dropping ivy cache from the slug"
rm -rf $SBT_USER_HOME/.ivy2

Note: You will need to have your build copy the necessary jars to run your application to a place that will remain included with the slug.

Commit and push the changes to your buildpack to your Github fork, then push your sample app to Heroku to test. You should see:

...
-----> Dropping ivy cache from the slug

License

Licensed under the MIT License. See LICENSE file.