RFR: 8367552: JCmdTestFileSafety.java fails when ran by root user

[Paul Hübner]

On Fri, 12 Sep 2025 15:30:49 GMT, Francesco Andreuzzi <fandreuzzi at openjdk.org> wrote:

> I noticed this while running the test in a Docker container. The test tries to call `File.setWriteable(false)` on a directory in which it later tries to override an existing CDS archive. Since the root user is not affected by the missing write permission, the test fails consistently.
> 
> I propose to skip it if we detect that 'root' is running it, should be a trivial change.

Thanks for fixing.

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Marked as reviewed by phubner (Author).

PR Review: https://git.openjdk.org/jdk/pull/27261#pullrequestreview-3224617356