gradle-master/subprojects/file-watching/src/main/java/org/gradle/internal/watch/vfs/impl/DefaultWatchableFileSystemDetector.java
/*
 * Copyright 2021 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.internal.watch.vfs.impl;

import com.google.common.collect.ImmutableSet;
import net.rubygrapefruit.platform.file.FileSystemInfo;
import net.rubygrapefruit.platform.file.FileSystems;
import org.gradle.internal.watch.vfs.WatchableFileSystemDetector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.util.stream.Stream;

public class DefaultWatchableFileSystemDetector implements WatchableFileSystemDetector {
    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultWatchableFileSystemDetector.class);

    // !IMPORTANT! If changed, make sure to update the documentation in gradle_daemon.adoc
    private static final ImmutableSet<String> SUPPORTED_FILE_SYSTEM_TYPES = ImmutableSet.of(
        // APFS on macOS
        "apfs",
        // HFS and HFS+ on macOS
        "hfs",
        "ext3",
        "ext4",
        "btrfs",
        "xfs",
        // NTFS on macOS
        "ntfs",
        // NTFS on Windows
        "NTFS",
        // FAT32 on macOS
        "msdos",
        // exFAT on macOS
        "exfat",
        // VirtualBox FS
        "vboxsf"
    );

    private final FileSystems fileSystems;

    public DefaultWatchableFileSystemDetector(FileSystems fileSystems) {
        this.fileSystems = fileSystems;
    }

    @Override
    public Stream<File> detectUnsupportedFileSystems() {
        return fileSystems.getFileSystems().stream()
            .filter(fileSystem -> {
                LOGGER.debug("Detected {}: {} from {} (remote: {})",
                    fileSystem.getFileSystemType(),
                    fileSystem.getMountPoint(),
                    fileSystem.getDeviceName(),
                    fileSystem.isRemote()
                );
                // We don't support network file systems
                if (fileSystem.isRemote()) {
                    return true;
                }
                return !SUPPORTED_FILE_SYSTEM_TYPES.contains(fileSystem.getFileSystemType());
            })
            .map(FileSystemInfo::getMountPoint);
    }
}
