Merge "Optimize EROFS detection code." into tm-dev

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.nio.charset.StandardCharsets;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

            addFeature(PackageManager.FEATURE_IPSEC_TUNNELS, 0);

        }

        if (isFilesystemSupported("erofs")) {

        if (isErofsSupported()) {

            if (isKernelVersionAtLeast(5, 10)) {

                addFeature(PackageManager.FEATURE_EROFS, 0);

            } else if (isKernelVersionAtLeast(4, 19)) {

        return Process.myUid() == Process.SYSTEM_UID;

    }

    private static boolean isFilesystemSupported(String fs) {

    private static boolean isErofsSupported() {

        try {

            final byte[] fsTableData = Files.readAllBytes(Paths.get("/proc/filesystems"));

            final String fsTable = new String(fsTableData, StandardCharsets.UTF_8);

            return fsTable.contains("\t" + fs + "\n");

            final Path path = Paths.get("/sys/fs/erofs");

            return Files.exists(path);

        } catch (Exception e) {

            return false;

        }