jdk-24/test/jdk/java/nio/file/attribute/BasicFileAttributeView/SetTimesNanos.java

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/* @test
 * @bug 8181493 8231174 8343417
 * @summary Verify that nanosecond precision is maintained for file timestamps
 * @library ../.. /test/lib
 * @build jdk.test.lib.Platform
 * @modules java.base/sun.nio.fs:+open
 * @run main SetTimesNanos
 */

import java.io.IOException;
import java.lang.reflect.Method;
import java.nio.file.Files;
import java.nio.file.FileStore;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.BasicFileAttributeView;
import java.nio.file.attribute.FileTime;
import java.util.List;
import java.util.Set;

import static java.nio.file.LinkOption.*;
import static java.util.concurrent.TimeUnit.*;

import jdk.test.lib.Platform;
import jtreg.SkippedException;

public class SetTimesNanos {

    public static void main(String[] args) throws Exception {
        Path dirPath = Path.of("test");
        Path dir = Files.createDirectory(dirPath);
        FileStore store = Files.getFileStore(dir);
        System.out.format("FileStore: \"%s\" on %s (%s)%n",
            dir, store.name(), store.type());

        Set<String> testedTypes = Platform.isWindows() ?
            Set.of("NTFS") : Set.of("apfs", "ext4", "xfs", "zfs");
        if (!testedTypes.contains(store.type())) {
            throw new SkippedException(store.type() + " not in " + testedTypes);
        }

        testNanos(dir);

        Path file = Files.createFile(dir.resolve("test.dat"));
        testNanos(file);

        testNanosLink(false);
        testNanosLink(true);
    }

    private static void testNanos(Path path) throws IOException {
        // Set modification and access times
        // Time stamp = "2017-01-01 01:01:01.123456789";
        long timeNanos = 1_483_261_261L*1_000_000_000L + 123_456_789L;
        FileTime pathTime = FileTime.from(timeNanos, NANOSECONDS);
        BasicFileAttributeView view =
            Files.getFileAttributeView(path, BasicFileAttributeView.class);
        view.setTimes(pathTime, pathTime, null);

        // Windows file time resolution is 100ns so truncate
        if (Platform.isWindows()) {
            timeNanos = 100L*(timeNanos/100L);
        }

        // Read attributes
        BasicFileAttributes attrs =
            Files.readAttributes(path, BasicFileAttributes.class);

        // Check timestamps
        String[] timeNames = new String[] {"modification", "access"};
        FileTime[] times = new FileTime[] {attrs.lastModifiedTime(),
            attrs.lastAccessTime()};
        for (int i = 0; i < timeNames.length; i++) {
            long nanos = times[i].to(NANOSECONDS);
            if (nanos != timeNanos) {
                throw new RuntimeException("Expected " + timeNames[i] +
                    " timestamp to be '" + timeNanos + "', but was '" +
                    nanos + "'");
            }
        }
    }

    private static void testNanosLink(boolean absolute) throws IOException {
        System.out.println("absolute: " + absolute);

        var target = Path.of("target");
        var symlink = Path.of("symlink");
        if (absolute)
            symlink = symlink.toAbsolutePath();

        try {
            Files.createFile(target);
            Files.createSymbolicLink(symlink, target);

            long timeNanos = 1730417633157646106L;

            // Windows file time resolution is 100ns so truncate
            if (Platform.isWindows()) {
                timeNanos = 100L*(timeNanos/100L);
            }

            var newTime = FileTime.from(timeNanos, NANOSECONDS);
            System.out.println("newTime: " + newTime.to(NANOSECONDS));

            for (Path p : List.of(target, symlink)) {
                System.out.println("p: " + p);

                var view = Files.getFileAttributeView(p,
                    BasicFileAttributeView.class, NOFOLLOW_LINKS);
                view.setTimes(newTime, newTime, null);
                var attrs = view.readAttributes();

                if (!attrs.lastAccessTime().equals(newTime))
                    throw new RuntimeException("Last access time "
                                               + attrs.lastAccessTime()
                                               + " != " + newTime);
                if (!attrs.lastAccessTime().equals(newTime))
                    throw new RuntimeException("Last modified time "
                                               + attrs.lastModifiedTime()
                                               + " != " + newTime);
            }
        } finally {
            Files.deleteIfExists(target);
            Files.deleteIfExists(symlink);
        }
    }
}