bzr fails for golang project in AppVeyor

[Paulo Janotti]

Recently a dependency that requires bazaar was added to the golang project, at first it started to fail because bzr was not found. I added it using "choco install bzr" plus "refreshenv" so it could pick up it from the path. However, the attempts to run bzr are failing with:

go: launchpad.net/[email blocked].0-20140225173054-000000000087: bzr branch --use-existing-dir https://launchpad.net/~niemeyer/gocheck/trunk . in c:\gopath\pkg\mod\cache\vcs\f46ce2ae80d31f9b0a29099baa203e3b6d269dace4e5357a2cf74bd109e13339: exit status 3:
bzr: ERROR: Invalid http response for http://bazaar.launchpad.net/~niemeyer/gocheck/trunk/info/refs?service=git-upload-pack: Unable to handle http code 500: Internal Server Error

which at first sounds like an external problem but same bzr tool succeeds on unix and mac. Search results didn't help much. I suspect that some other golang project may have faced the same issue.

Respective issue on AppVeyor: https://help.appveyor.com/discussions/problems/20310-bazaar-fails-on-golang-project-internal-server-error-500

I don't have access to an environment to try to repro this directly, the version installed via chocolatey is:

 Download of bzr-2.5.1-1-setup.exe (20.06 MB) completed.

[Jelmer Vernooij (jelmer)]

This is Bzr probing for a Git repository, but failing because launchpad replies with a 500.