Docker for Mac - use DOCKER_CONFIG var

docker_config_var_mac.md

Docker for Mac does not respect the DOCKER_CONFIG var - docker/for-mac#2635

However, using launchctl you can get the desktop app to use a different .docker location.

• Create a plist file, I use environment.plist as I use this workaround for other apps.
• Insert the following into the plist file:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
        <dict>
                <key>Label</key>
                <string>my.startup</string>
                <key>ProgramArguments</key>
                <array>
                        <string>sh</string>
                        <string>-c</string>
                        <string>
                                launchctl setenv DOCKER_CONFIG /Users/myuser/.config/docker
                        </string>
                </array>
                <key>RunAtLoad</key>
                <true/>
        </dict>
</plist>

• Move the file to the LaunchAgents folder (optional, but recommended) mv environment.plist ~/Library/LaunchAgents/
• Start the agent launchctl start ~/Library/LaunchAgents/environment.plist

Now, when you open Docker (or any other app!), the DOCKER_CONFIG variable will be set to the value you provide, and Docker will use the proper path for the config.