Sometimes you just need to know what Cloud Foundry is working with. This plugin downloads the current droplet for an app to your local file system. This works even if the app won't start, the only requirement is the stager successfully builds a droplet. It's useful for troubleshooting and you can't figure out what else to do (like this).
$ cf download-droplet
Usage: cf download-droplet APP_NAME PATH
$ cf download-droplet gocf /tmp/gocf.tar
Saving gocf's droplet to /tmp/gocf.tar
$ file gocf.tar
gocf.tar: gzip compressed data, from Unix, last modified: Fri Jan 8 22:13:58 2016
Saving gocf's droplet to /tmp/gocf.tar
➜ /tmp tar -xvmf gocf.tar
x ./: Can't update time for .
x ./staging_info.yml
x ./logs/
x ./tmp/
x ./app/
x ./app/app.go
x ./app/Procfile
x ./app/.profile.d/
x ./app/.profile.d/concurrency.sh
x ./app/.profile.d/go.sh
x ./app/widget.go
x ./app/Godeps/
x ./app/Godeps/Readme
x ./app/Godeps/_workspace/
x ./app/Godeps/_workspace/src/
x ./app/Godeps/_workspace/src/github.com/
x ./app/Godeps/_workspace/src/github.com/julienschmidt/
x ./app/Godeps/_workspace/src/github.com/julienschmidt/httprouter/
x ./app/Godeps/_workspace/src/github.com/julienschmidt/httprouter/README.md
x ./app/Godeps/_workspace/src/github.com/julienschmidt/httprouter/path.go
x ./app/Godeps/_workspace/src/github.com/julienschmidt/httprouter/LICENSE
x ./app/Godeps/_workspace/src/github.com/julienschmidt/httprouter/router.go
x ./app/Godeps/_workspace/src/github.com/julienschmidt/httprouter/tree.go
x ./app/Godeps/_workspace/src/github.com/julienschmidt/httprouter/.travis.yml
x ./app/Godeps/_workspace/pkg/
x ./app/Godeps/_workspace/pkg/darwin_amd64/
x ./app/Godeps/_workspace/pkg/darwin_amd64/github.com/
x ./app/Godeps/_workspace/pkg/darwin_amd64/github.com/julienschmidt/
x ./app/Godeps/_workspace/pkg/darwin_amd64/github.com/julienschmidt/httprouter.a
x ./app/Godeps/Godeps.json
x ./app/bin/
x ./app/bin/goservice
➜ /tmp
$ cf add-plugin-repo CF-Community http://plugins.cloudfoundry.org/
$ cf install-plugin 'Download Droplet' -r CF-Community
Install from Source (need to have Go installed)
$ go get github.com/cloudfoundry/cli
$ go get github.com/krujos/download_droplet_plugin
$ cd $GOPATH/src/github.com/krujos/download_droplet_plugin
$ go build
$ cf install-plugin download_droplet_plugin