bug#51857: cross-filesystem copying broken on macOS with coreutils >= 9.0

[Paul Eggert]

On 11/15/21 19:14, Sudhip Nashi wrote:
> lseek(0x3, 0x0, 0x3)             = -1 Err#6

Oh my, it appears lseek (fd, 0, SEEK_HOLE) is failing with errno == 
ENXIO when the file has no holes, even though the Darwin man page 
clearly states that lseek should return the file size in that case (see 
<https://github.com/apple/darwin-xnu/blob/main/bsd/man/man2/lseek.2>). 
So, not only does macOS lseek disagree with all other implementations, 
it even disagrees with the Darwin documentation.

To work around this macOS problem I installed the attached further patch 
into Gnulib and propagated it into coreutils. Please try the latest 
coreutils version on Savannah, or you can simply run configure+make from 
the tarball that is temporarily at:

https://web.cs.ucla.edu/~eggert/coreutils-9.0.28-6d0f0.tar.gz

0001-lseek-port-around-macOS-SEEK_HOLE-glitch.patch
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