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Re: [PATCH] File::Copy & permission bits.

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Steve Peters
June 1, 2008 16:02
Re: [PATCH] File::Copy & permission bits.
Message ID:
On Fri, May 23, 2008 at 10:53 AM, Craig A. Berry
<> wrote:
> On Wed, May 7, 2008 at 4:16 PM, Abigail <> wrote:
>> The following patch to File::Copy makes if one copies a file, permission
>> bits are handled as POSIX 1003.1 describes the shell utility 'cp' ought
>> to behave.
> Belatedly following up on this.  If the rationale is that Perl should
> act as much as possible like a native utility, then this clearly is
> the right thing to do.  If, on the other hand, Perl should have its
> own definition of the right thing to do and act the same on all
> platforms, then this actually widens the gap between platforms.  I
> don't have any strong objection to your change, but I just want you to
> be aware you are shifting us from the latter to the former (after
> umpteen years of the latter).
>> A few points:
>>  * The patch is probably incomplete. Non-Unix systems may need some
>>    special handling, depending on what '(stat $fh) [2]' returns.
>>    I neither have knowledge of, nor access to any non-Unix systems
>>    to develop this myself.
>>  * This patch introduces a non-backwards compatible change. Some code
>>    somewhere is probably relying on the fact the permission bits of
>>    the new file have no relation to the file copied from.
> On VMS, and I believe also on Win32 (which closely mimics the VMS file
> protection scheme), the absence of a relationship between the source
> file permissions and the target file permissions is by design.  The
> specifics can get rather complicated, but the gist of it is that a
> copy of a file is a new file that is expected to play nice in its new
> environment, where "environment" may include previous versions of the
> same file, process defaults, directory defaults, ACLs, etc.  Native
> utilities can override this behavior (COPY/PROTECTION on VMS, XCOPY /O
> on Windows), but it's something you have to ask for explicitly.
>>  * The new tests may not work on all non-Unix systems.
> I'd say they are unlikely to work at all on any non-Unix system.  I've
> checked in change #33916 to skip them on VMS.  Last I saw they were
> all failing in the Win32 smokes and they will probably have to be
> skipped there as well.

Since the other Steve's connectivity is spotty right now, I'll be
testing and updating Win32 shortly.

Steve Peters

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