ssh config stanza to use `gcloud beta ssh ...` straight via `ssh` CLI

dotssh-config-add.cfg

### Add below stanza to your ~/.ssh/config
## Parsed as vmname.REGION.PROJECT.gcp
Host *.*.*.gcp
        ProxyCommand gcloud beta compute ssh --tunnel-through-iap $(echo %h|awk -v FS=. '{ printf ("--project=%%s --zone=%%s %%s", $3, $2, $1) }') --command="nc -q0 localhost 22"

ssh-example-use.log

# Plain ssh against some VM (replace vm-name, some-project names below)
$ ssh vm-name.us-central1-a.some-project.gcp uname -r
4.19.0-18-cloud-amd64

# Or use any other ssh- backed tool, e.g:.
$ rsync vm-name.us-central1-a.some-project.gcp:

# SSH agent forwarding ftW
$ ssh -A vm-name.us-central1-a.some-project.gcp

## At VM prompt:
vm-name $ git clone git@github:foo/private-repo