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Re: bin/55815: tar opens device files
On Wed, Nov 25, 2020 at 05:55:01AM +0000, Martin Husemann wrote:
> The following reply was made to PR bin/55815; it has been noted by GNATS.
> From: Martin Husemann <martin%duskware.de@localhost>
> To: gnats-bugs%netbsd.org@localhost
> Subject: Re: bin/55815: tar opens device files
> Date: Wed, 25 Nov 2020 06:54:12 +0100
> On Tue, Nov 24, 2020 at 08:15:02PM +0000, Joerg Sonnenberger wrote:
> > As discussed on IRC, this is a side effect of enabling ACL and extattr
> > support OOB. It is avoided when using --no-acls --no-extattr.
> Those should be the default then, or maybe check (is there a mount flag
> or something in statvfs?) whether any ACLs or ext attrs could be there at
That would be the ostrich approach of ignoring that open with side
effects is fundamentally a bad idea. It also doesn't match what other
tar implementations do and violates POLA just as well.
> What happens if the device can not be opened at all, will it be left out of
> the tar?
No ACLs or extattrs will be saved in that case.
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