Constellation Container does not start: "storage service endpoint not initialised"

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I had the issue that the Constellation container did not start - stating that the storage service was not initialized and hence the certificate and key files could not be read. Reason is a weak assumption in /usr/src/app/src/utils.js:

exports.inContainer = function () {
    let containerised = false;
    try {
        const cgroups = childProcess.execSync("cat /proc/1/cgroup").toString('utf8');
        ...
        containerised = !!cgroups.match(new RegExp('[0-9]+\:[a-z_-]+\:\/docker\/', 'i'));
    }
    ...
    return containerised;
}

/proc/1/cgroup does not always contain the keyword “docker” when running inside a container. Suggestion is to rather check for the existence of “/.dockerenv”.

Possible workaround: Derive your own container image and provide your own version of utils.js.