Method Add

loader/loader.go:226–253

(filename, service string)

}

func (ct *cycleTracker) Add(filename, service string) (*cycleTracker, error) {
	toAdd := serviceRef{filename: filename, service: service}
	for _, loaded := range ct.loaded {
		if toAdd == loaded {
			// Create an error message of the form:
			// Circular reference:
			//   service-a in docker-compose.yml
			//   extends service-b in docker-compose.yml
			//   extends service-a in docker-compose.yml
			errLines := []string{
				"Circular reference:",
				fmt.Sprintf("  %s in %s", ct.loaded[0].service, ct.loaded[0].filename),
			}
			for _, service := range append(ct.loaded[1:], toAdd) {
				errLines = append(errLines, fmt.Sprintf("  extends %s in %s", service.service, service.filename))
			}

			return nil, errors.New(strings.Join(errLines, "\n"))
		}
	}

	var branch []serviceRef
	branch = append(branch, ct.loaded...)
	branch = append(branch, toAdd)
	return &cycleTracker{
		loaded: branch,
	}, nil
}

// WithDiscardEnvFiles sets the Options to discard the `env_file` section after resolving to
// the `environment` section