genmgr

genmgr is a binary used to apply reviewers and update go.mod in a gocloud regen CL once the corresponding genproto PR is submitted.

Required tools

1. Install Go

2. Install Go tools:

   go get \
       golang.org/x/lint/golint \
       golang.org/x/tools/cmd/goimports \
       honnef.co/go/tools/cmd/staticcheck \
       golang.org/x/review/git-codereview
   

Getting certs

This tool relies on API authentication for both github (which hosts the google.golang.org/genproto/... libraries) and the Gerrit code review instance code-review.googlesource.com which is where the cloud.google.com/go/... libraries are maintained.

You need to supply credentials for both systems to successfully manage the generation of gapic libraries.

Github

For Github, you need to generate/supply a Personal Access Token. More information on how that's done is here: https://help.github.com/en/github/authenticating-to-github/creating-a-personal-access-token-for-the-command-line

Gerrit

For Gerrit, you need a gerrit authentication cookie. The authentication flow in gerrit to fetch this information begins here: https://code-review.googlesource.com/settings/#HTTPCredentials

At the end, it provides a shell script for injecting the cookies into your .gitcookies file. There's typically two cookies in the provided shell script, one for code.googlesource.com and one for code-review.googlesource.com (though there is an option to generate a single cookie for the entire domain as well). You want the cookie correspnding to code-review.googlesource.com.

The relevant portion which needs to be passed to this tool looks similar to this (you need both the identity and the secret): git-yourlogin.yourdomain.com=1//abcdef01010209202-cbdef010102-skdjskljsdkjsksjd

Running locally

Note: this may change your ~/.gitconfig and ~/.gitcookies.

cd /path/to/internal/gapicgen
go run cloud.google.com/go/internal/gapicgen/cmd/genmgr \
    --githubAccessToken=11223344556677889900aabbccddeeff11223344 \
    --githubName="Jean de Klerk" \
    --githubEmail=deklerk@google.com \
    --gerritCookieValue=<cookie>

Running with docker

Note: this may leave a lot of docker resources laying around. Use docker system prune to clean up after runs.

cd /path/to/internal/gapicgen/cmd/genmgr
docker build . -t genmgr
docker run -t --rm --privileged \
    -v `pwd`/../..:/gapicgen \
    -e "GITHUB_ACCESS_TOKEN=11223344556677889900aabbccddeeff11223344" \
    -e "GITHUB_NAME=\"Jean de Klerk\"" \
    -e "GITHUB_EMAIL=deklerk@google.com" \
    -e "GERRIT_COOKIE_VALUE=<cookie>" \
    genmgr