Build inconsistency when pushing go to Heroku

[brandur]

Hey @freeformz, I might need some expert help with one :) I have a project that I've managed to push to Heroku many times successfully in the past, but after a minor refactor, will no longer build.

It seems that the package that I refactored can't be located:

$ git push staging master
Counting objects: 544, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (308/308), done.
Writing objects: 100% (544/544), 249.16 KiB | 0 bytes/s, done.
Total 544 (delta 203), reused 517 (delta 185)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Go app detected
remote: -----> Checking Godeps/Godeps.json file.
remote: -----> Using go1.4.2
remote: -----> Running: godep go install -tags heroku ./...
remote: cmd/midgard-drip/main.go:6:2: cannot find package "github.com/heroku/midgard/log" in any of:
remote:         /app/tmp/cache/go1.4.2/go/src/github.com/heroku/midgard/log (from $GOROOT)
remote:         /tmp/build_cb970858d6be73d56650d7d715998909/.heroku/go/src/github.com/heroku/midgard/Godeps/_workspace/src/github.com/heroku/midgard/log (from $GOPATH)
remote:         /tmp/build_cb970858d6be73d56650d7d715998909/.heroku/go/src/github.com/heroku/midgard/log
remote: godep: go exit status 1
remote:
remote:  !     Push rejected, failed to compile Go app
remote:
remote: Verifying deploy....
remote:
remote: !       Push rejected to midgard-staging.
remote:
To https://git.heroku.com/midgard-staging.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/midgard-staging.git'

It builds fine on Travis though, and also locally:

$ godep go install -tags heroku ./...
$

It seems that the package is in the expected directory:

$ pwd
/Users/brandur/Documents/go/src/github.com/heroku/midgard
$ ls log
log.go          log_test.go

And that the files within the package correctly define their package:

$ head -n 1 log/*
==> log/log.go <==
package log

==> log/log_test.go <==
package log

Git is clean:

$ git status
On branch master
nothing to commit, working directory clean

The project is located at heroku/midgard if you want to take a look. Any ideas? Possibly a caching issue?

[freeformz]

@brandur Looking at this now. Thanks for the detailed bug report.

[freeformz]

@brandur I don't think this is actually related to the go buildpack. Looking into it more with others.

[freeformz]

This turns out to be heroku pruning a dir rooted in your repo named log. Should be fixed "soonish".

[brandur]

@freeformz Hah, sweet. Thanks for taking a look into this one. Closing it out.

[freeformz]

@brandur the fix for this is now deployed,.

[brandur]

@freeformz You rock. Thanks!

[freeformz]

@brandur Thanks, but all credit goes to @ojacobson for fixing and deploying the affected system.