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  1. JDK
  2. JDK-8220793

(fs) No support for changing modification time of symlink

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    • Subcomponent:
    • Resolved In Build:
      b20
    • CPU:
      x86_64
    • OS:
      os_x

      Description

      ADDITIONAL SYSTEM INFORMATION :
      macOS 10.13.6 (17G5019), but reliably reproduceable on any Mac or Linux system.

      openjdk version "11.0.2" 2018-10-16
      OpenJDK Runtime Environment 18.9 (build 11.0.2+7)
      OpenJDK 64-Bit Server VM 18.9 (build 11.0.2+7, mixed mode)

      A DESCRIPTION OF THE PROBLEM :
      Calling BasicFileAttributeView.setTimes fails for any symlink:

      Exception in thread "main" java.nio.file.FileSystemException: /tmp/symlink: Too many levels of symbolic links or unable to access attributes of symbolic link
      at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:96)
      at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
      at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:116)
      at java.base/sun.nio.fs.UnixFileAttributeViews$Basic.setTimes(UnixFileAttributeViews.java:85)


      This issue is closely related to https://bugs.openjdk.java.net/browse/JDK-8139133, but with the difference that for symbolic links sun.nio.fs.UnixPath#openForAttributeAccess doesn't throw an ENXIO error but an ELOOP error. Therefore the fix for JDK-8139133 can be extended to also fix this issue.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Create a symlink (target doesn't need to exist):

      ln -s foo /tmp/symlink

      Then run the Java test case program attached to this issue.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      Last Modified Date of /tmp/symlink is set to 2001-09-09
      ACTUAL -
      java.nio.file.FileSystemException: /tmp/symlink: Too many levels of symbolic links or unable to access attributes of symbolic link

      ---------- BEGIN SOURCE ----------
      import java.io.IOException;
      import java.nio.file.Files;
      import java.nio.file.LinkOption;
      import java.nio.file.Path;
      import java.nio.file.Paths;
      import java.nio.file.attribute.BasicFileAttributeView;
      import java.nio.file.attribute.FileTime;

      public class SymlinkTest {

      public static void main(String args[]) throws IOException {
      Path link = Paths.get("/tmp/symlink");
      BasicFileAttributeView view = Files.getFileAttributeView(link, BasicFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);
      view.setTimes(FileTime.fromMillis(1000000000000l), null, null);
      }

      }
      ---------- END SOURCE ----------

      FREQUENCY : always


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            Assignee:
            bpb Brian Burkhalter
            Reporter:
            webbuggrp Webbug Group
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              Updated:
              Resolved: