RFR: 8334339: Test java/nio/file/attribute/BasicFileAttributeView/CreationTime.java fails on alinux3 [v2]

[Alan Bateman]

On Sun, 16 Jun 2024 15:01:29 GMT, SendaoYan <syan at openjdk.org> wrote:

>> Hi all,
>>   The testcase `java/nio/file/attribute/BasicFileAttributeView/CreationTime.java` fails on alinux3(alibaba cloud linux version 3) after [JDK-8316304](https://bugs.openjdk.org/browse/JDK-8316304).
>>   The testcase use /tmp directory to create the file and get the createtime(birth time) of this file. But on alinux3(alibaba cloud linux version 3), the /tmp is mount as tmpfs, it's not a real physic disk paitition, it's mount from RAM, and the alinux3 doesn't support get the `birth time` on tmpfs.
>>   On ubuntu 22, when I create a file on /dev/shm(it's also a tmpfs type partition), stat also doesn't support `birth time`.
>>   According to the [Java API doc](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/nio/file/attribute/BasicFileAttributes.html#creationTime()), If the file system implementation does not support a time stamp to indicate the time when the file was created, the creationTime() API return the epoch (1970-01-01T00:00:00Z).
>> 
>>   So in this PR, if the test directory(on linux the test directory is /tmp) doesn't support `birth time`, the test throw a jtreg.SkippedException, rather than report a failure.
>>   And in this PR, I create a new test, change the test directory from /tmp to `pwd`, which the current work directory maybe at diffrent partition to /tmp, and the current work directory support `birth time` possibly.
>> 
>>  The change has been verified on below env:
>> 
>> - [x] alinux3 run test CreationTime.java
>> - [x] windows run test CreationTime.java
>> 
>> [windows-CreationTime.java.log](https://github.com/user-attachments/files/15857148/windows-CreationTime.java.log)
>> [alinux3-CreationTime.java.log](https://github.com/user-attachments/files/15857149/alinux3-CreationTime.java.log)
>
> SendaoYan has updated the pull request incrementally with three additional commits since the last revision:
> 
>  - delete an extra whitespace for line77
>  - delete an extra whitespace for line : @test id=cwd
>  - add function comment for supportBirthTimeOnLinux

Would it be possible to say what `Files.getFileStore(file).type()` returns? The test has an existing method to skip and I'm wonder if that could be used rather than introducing another.

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PR Comment: https://git.openjdk.org/jdk/pull/19737#issuecomment-2172855619