.kokoro/validator.sh 
/tmp ~/Documents/conformance-tests
Cloning into 'googleapis'...
remote: Enumerating objects: 5917, done.
remote: Counting objects: 100% (5917/5917), done.
remote: Compressing objects: 100% (2198/2198), done.
remote: Total 5917 (delta 4385), reused 4175 (delta 3616), pack-reused 0
Receiving objects: 100% (5917/5917), 4.13 MiB | 3.88 MiB/s, done.
Resolving deltas: 100% (4385/4385), done.
~/Documents/conformance-tests
~/Documents/conformance-tests/storage/v1 ~/Documents/conformance-tests
/go/include: warning: directory does not exist.
protoc-gen-go: unable to determine Go import path for "google/cloud/conformance/storage/v1/tests.proto"

Please specify either:
        • a "go_package" option in the .proto source file, or
        • a "M" argument on the command line.

See https://developers.google.com/protocol-buffers/docs/reference/go-generated#package for more information.