Function MergeExtraEnvs

coderd/provisionerdserver/provisionerdserver.go:3471–3504

MergeExtraEnvs applies extra environment variables to the given map, respecting the merge_strategy field on each env. When merge_strategy is empty or "replace", the value overwrites any existing entry. "append" and "prepend" join values with a ":" separator (PATH-style). "error" causes a failure if

(env map[string]string, extraEnvs []*sdkproto.Env)

// "append" and "prepend" join values with a ":" separator (PATH-style).
// "error" causes a failure if the key already exists.
func MergeExtraEnvs(env map[string]string, extraEnvs []*sdkproto.Env) error {
	for _, e := range extraEnvs {
		strategy := e.GetMergeStrategy()
		if strategy == "" {
			strategy = "replace"
		}
		existing, exists := env[e.GetName()]
		switch strategy {
		case "error":
			if exists {
				return xerrors.Errorf(
					"duplicate env var %q: merge_strategy is %q but variable is already defined",
					e.GetName(), strategy,
				)
			}
			env[e.GetName()] = e.GetValue()
		case "append":
			if exists && existing != "" {
				env[e.GetName()] = existing + ":" + e.GetValue()
			} else {
				env[e.GetName()] = e.GetValue()
			}
		case "prepend":
			if exists && existing != "" {
				env[e.GetName()] = e.GetValue() + ":" + existing
			} else {
				env[e.GetName()] = e.GetValue()
			}
		default: // "replace"
			env[e.GetName()] = e.GetValue()
		}
	}
	return nil
}

func encodeSubagentEnvs(envs []*sdkproto.Env) (pqtype.NullRawMessage, error) {
	if len(envs) == 0 {