Undocumented Docker Environment Variables

gistfile1.txt

# clone repo and extract all DOCKER_* environment variables used in the code

git clone https://github.com/docker/docker.git
cd docker
grep -rn "os.Getenv" . | sed -r 's/([^:]*:[0-9]*:).*os.Getenv\(([^\)]*)\).*/\2/' | grep DOCKER_ | sort -u

# remove all documented DOCKER_* envrionemnt variables (https://docs.docker.com/engine/reference/commandline/cli/#environment-variables)

"DOCKER_BINARY"
"DOCKER_CONTAINER_NAT"
"DOCKER_CONTENT_TRUST_OFFLINE_PASSPHRASE"
"DOCKER_CONTENT_TRUST_REPOSITORY_PASSPHRASE"
"DOCKER_CONTENT_TRUST_ROOT_PASSPHRASE"
"DOCKER_CONTENT_TRUST_TAGGING_PASSPHRASE"
"DOCKER_ENGINE_GOARCH"
"DOCKER_GRAPHDRIVER"
"DOCKER_REMAP_ROOT"
"DOCKER_REMOTE_DAEMON"
"DOCKER_USERLANDPROXY"