Function parseStorePathFromInstallableOutput

internal/nix/store.go:78–102

parseStorePathFromInstallableOutput parses the output of `nix store path-from-installable --json` into a map of store paths to whether they are in the store. This function is decomposed out of StorePathFromInstallable to make it testable.

(output []byte)

// into a map of store paths to whether they are in the store.
// This function is decomposed out of StorePathFromInstallable to make it testable.
func parseStorePathFromInstallableOutput(output []byte) (map[string]bool, error) {
	result := map[string]bool{}

	// Newer nix versions (like 2.20) have output of the form
	// {"<store-path>": {}}
	// Note that values will be null if paths are not in store.
	var modernPathInfo map[string]any
	if err := json.Unmarshal(output, &modernPathInfo); err == nil {
		for path, val := range modernPathInfo {
			result[path] = val != nil
		}
		return result, nil
	}

	var legacyPathInfos []LegacyPathInfo

	if err := json.Unmarshal(output, &legacyPathInfos); err == nil {
		for _, outValue := range legacyPathInfos {
			result[outValue.Path] = outValue.Valid
		}
		return result, nil
	}

	return nil, fmt.Errorf("failed to parse path-info output: %s", output)
}

// DaemonError reports an unsuccessful attempt to connect to the Nix daemon.
type DaemonError struct {