Find gmail id based on project id of appspot - google-app-engine

Question

I have so many appengine projects running on different google accounts. I have forgotten which google account I have used for one of my appengine projects. Is there a way to find out the google account id based on my project id?

Answer 1

There is not; this would likely be a security concern if it were possible.
The solution would be to iterate over all your accounts and test each account in turn -- like a key -- in the project's lock until you -- hopefully -- find one that works.
You'll want to identify a command that you consider sufficient to determine that you have access, perhaps:
gcloud projects describe ${PROECT}
Then you could iterate across all your authenticated accounts, trying this command:
for ACCOUNT in $(gcloud auth list --format="value(account)"); do
gcloud projects describe ${PROJECT} --account=${ACCOUNT}
done
UPDATE
More cute (but in full-disclosure I find gcloud filter|formatting challenging cf to jq):
for ACCOUNT in $(gcloud auth list --format="value(account)"); do
ROLE=$(\
gcloud projects get-iam-policy ${PROJECT} \
--flatten="bindings[].members" \
--filter="bindings.members=user:${ACCOUNT}" \
--format="value(bindings.role)")
printf "%s\t%s\n" ${ACCOUNT} ${ROLE}
done