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Re: bug#51857: cross-filesystem copying broken on macOS with coreutils >

From: Paul Eggert
Subject: Re: bug#51857: cross-filesystem copying broken on macOS with coreutils >= 9.0
Date: Mon, 15 Nov 2021 15:41:00 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0

On 11/15/21 10:37, Sudhip Nashi wrote:
Turns out lseek is broken (or at least works differently) on macOS as well 
(https://lists.gnu.org/archive/html/bug-gnulib/2018-09/msg00054.html). Funny 
coincidence! I’ll take a better look later this week if I can and try to see 
what the exact problem is.

Thanks, I think I see the problem now.

Eventually macOS will likely get fixed to work around this lseek+SEEK_DATA incompatibility (as FreeBSD, Solaris, etc. all do things the Linux way and that's what I think will appear in the next POSIX), but in the meantime I attempted to work around the portability issue by installing the attached patch into Gnulib, and by syncing coreutils to the latest Gnulib.

I don't use macOS so have not tested this. Please give it a try, either by building from bleeding-edge coreutils on Savannah, or by building from the tarball temporarily here:



Attachment: 0001-lseek-port-around-macOS-SEEK_DATA-glitch.patch
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