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bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS

From: Pádraig Brady
Subject: bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS
Date: Fri, 10 Feb 2023 22:02:54 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Thunderbird/109.0

On 10/02/2023 21:50, Paul Eggert wrote:
On 2/10/23 13:35, George Valkov wrote:

Since the source and it’s clone have separate metadata,
it should be possible to change it on the clone, to comply with standards.

Attached is a hacky patch to do that. It also uses the new CLONE_ACL
flag. The old code apparently mishandled ACLs; the new code tries to do
a better job.

Yes this is looking much better.
I'm not fully convinced that we should also update the times,
but not against it either.

This whole area is a mess, but the patch should improve correctness on
macOS, while also being efficient in the usual case.

Yes it's a pity there is no fd (data) only interface for this,
rather than dealing with names (metadata) too.


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