zhongjingxiong edited a comment on pull request #4036:
URL: https://github.com/apache/hadoop/pull/4036#issuecomment-1080612022
```java
File tempFile = File.createTempFile("test-unzip", ".txt");
Files.setPosixFilePermissions(tempFile.toPath(), permissionsFromMode(0700));
UserPrincipalLookupService lookupService =
FileSystems.getDefault().getUserPrincipalLookupService();
GroupPrincipal groupPrincipal =
lookupService.lookupPrincipalByGroupName("staff");
UserPrincipal userPrincipal = lookupService.lookupPrincipalByName("cooper");
PosixFileAttributeView view = Files.getFileAttributeView(tempFile.toPath(),
PosixFileAttributeView.class);
view.setGroup(groupPrincipal);
readTargetPermission(tempFile.toPath());
// This is going to fail because it's just a normal user
view.setOwner(userPrincipal);
readTargetPermission(tempFile.toPath());
assertTrue("file lacks execute permissions", tempFile.canExecute());
assertTrue("file lacks write permissions", tempFile.canWrite());
assertTrue("file lacks read permissions", tempFile.canRead());```
I tried to change the current user, but failed.
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