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

[Pádraig Brady]

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,
Pádraig