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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: Sun, 19 Feb 2023 16:31:37 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Thunderbird/109.0

On 19/02/2023 06:08, Paul Eggert wrote:
George, given what you've written I suppose we should give up the idea
of copying sparse files efficiently on macOS (and on FreeBSD
13.0-RELEASE, as it has a similar bug with SEEK_HOLE and SEEK_DATA), in
cases where fclonefileat does not work.

Please try the attached Gnulib patch; it uses your idea of disabling
SEEK_HOLE and SEEK_DATA on macOS, except on steroids because it disables
these two macros everywhere, for all Gnulib-using applications, and it
also disables them on FreeBSD < 14. For coreutils you need only this
patch's change to lib/unistd.in.h. If this works for you I suppose we
can install it into Gnulib and propagate that into coreutils etc.

Also, you reported the bug against macOS 12.6. Can you check whether the
same bug occurs on macOS 13? If it's still there I suppose the attached
patch will need to be updated since it guesses the bug is fixed in macOS 13.

I'll cc this email to bug-gnulib to give them a heads-up. (Gnulib
readers can see <https://bugs.gnu.org/61386> for context.)

Really, Apple should fix this serious data corruption bug in APFS and macOS.

Yes I concur.
I'll adjust the coreutils tests to avoid
using SEEK_DATA if not available in a more dynamic manner.

thank you,

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