BUILD file not found on package path when loading worker_protobuf_java_proto target

[Miles Yucht]

Hi all,

I'm trying to update the version of Bazel for a project that uses Bazel's java protobuf libraries. In version 0.2.2b, we depended on a target @bazel_tools//src/main/protobuf:worker_protobuf_java_proto, but I get the following error when building this project on version 0.3.0:

error loading package '@bazel_tools//src/main/protobuf': Extension file not found. Unable to load package for '@bazel_tools//third_party/protobuf:protobuf.bzl': BUILD file not found on package path and referenced by '//bazel/rules/scala/scala:scala-worker-lib'.

I installed Bazel on Ubuntu 16.04 following the instructions at http://www.bazel.io/docs/install.html, and bazel version prints the following output:

Build label: 0.3.0

Build target: bazel-out/local-fastbuild/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar

Build time: Fri Jun 10 11:38:23 2016 (1465558703)

Build timestamp: 1465558703

Build timestamp as int: 1465558703

Minimal reproductive case which I think demonstrates the problem:

mkdir test

cd test

touch WORKSPACE

bazel query 'kind(rule, @bazel_tools//src/main/protobuf:all)'

results in:

ERROR: while parsing '@bazel_tools//src/main/protobuf:all': error loading package '@bazel_tools//src/main/protobuf': Extension file not found. Unable to load package for '@bazel_tools//third_party/protobuf:protobuf.bzl': BUILD file not found on package path.

It seems like this BUILD file is present in the release according to github: https://github.com/bazelbuild/bazel/blob/0.3.0/third_party/protobuf/BUILD

Appreciate the guidance in advance!

Miles

[Miles Yucht]

Sorry, the target name is worker_protocol_java_proto, not worker_protobuf_java_proto.

[Miles Yucht]

Ah, I just saw this: https://github.com/bazelbuild/bazel/commit/285112c9b61ca3782e00ccf6411339da7291a3c3. Where can we get these dependencies from now, if not from bazel_tools?

[Damien Martin-guillerez]

Hi Miles,

You can use a git_repository to depends on the bazel repository. This protobuf was never intended to be accessed from the bazel_tools repository.

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[Miles Yucht]

Hi Damien,

Thanks for your response! That's exactly what I ended up doing (copying what you guys did in the dash project).

By the way, I was trying to find out exactly what the bazel_tools repository was, since it seems like you can use it without actually adding it in the WORKSPACE file. Where can I go to find out what the bazel_tools repository exposes?

Thanks again!

Miles

[Damien Martin-guillerez]

It is created by https://github.com/bazelbuild/bazel/blob/0773430188885e075121ebf720c82bb05a39db21/src/main/java/com/google/devtools/build/lib/bazel/rules/tools.WORKSPACE and constructed through https://github.com/bazelbuild/bazel/blob/0773430188885e075121ebf720c82bb05a39db21/src/BUILD#L90. It is made to ship native rules tools along with Bazel.