RFR: 8338884: java/nio/file/attribute/BasicFileAttributeView/CreationTime.java#tmp fails on alinux3 [v2]

[SendaoYan]

On Mon, 26 Aug 2024 10:05:41 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

>> It is difficult to enumerate which file types in Linux do and do not support creation time.
>> How about add a function that use `stat -c` linux command line to determise support or not.
>> 
>> 
>> +    /**
>> +     * read the output of linux command `stat -c "%w" file`, if the output is "-",
>> +     * then the file system doesn't support birth time
>> +     */
>> +    public static boolean supportBirthTimeOnLinux(Path file) {
>> +        try {
>> +            String filePath = file.toAbsolutePath().toString();
>> +            ProcessBuilder pb = new ProcessBuilder("stat", "-c", "%w", filePath);
>> +            pb.redirectErrorStream(true);
>> +            Process p = pb.start();
>> +            BufferedReader b = new BufferedReader(new InputStreamReader(p.getInputStream()));
>> +            String l = b.readLine();
>> +            if (l != null && l.equals("-")) { return false; }
>> +        } catch(Exception e) {
>> +        }
>> +        return true;
>> +    }
>
> It's a possibility. I'm fine with the current "tmpfs" special case in the test, but I guess what you proposed above would be more robust. So if others are OK with such an approach, that would be fine with me as well.

Use `stat -c` linux command line to determise support `create time` or not.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20687#discussion_r1731153397