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Bug#1107169: cp --preserve=mode from nfs-mounted share works but returns error

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On Mon, Jun 02, 2025 at 05:31:00PM +0000, bls 3427 wrote:
> and the NFS client disk are ext4.
> 
> This works correctly and without error on a Debian 12 X64 or arm64 NFS client system.
> 
> NFS server:
> * Debian 12 X64
> * File system fstab entry: /dev/disk/by-partuuid/6ce32e00-7481-b244-9924-f616c327c050 /h    ext4 defaults,noatime 0 0
> * /etc/exports entry: /h               192.168.92.0/24(rw,no_root_squash,no_subtree_check,insecure)
> 
> NFS client:
> * Debian 13 X64
> * fstab entry: mondo:/h        /h      nfs rw,noatime,x-systemd.automount,x-systemd.idle-timeout=3600 0 0
> 
> * NFS mount via mount command: mondo:/h on /h type nfs4 (rw,noatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr\
> =192.168.92.116,local_lock=none,addr=192.168.92.9,x-systemd.automount,x-systemd.idle-timeout=3600)
> 
> Copying a file from the NFS server share to the NFS client with no switches works correctly.
> 
> Copying with --preserve=mode copies the file correctly but exits with a failure status.
> 
> d13~/test# ls -l l /h/tmp
> total 8
> drwxr-xr-x  2 root root 4096 Jun  2 10:15 .
> drwxr-xr-x 19 root root 4096 Jun  2 10:15 ..
> -rw-r--r--  1 root root    0 Jun  2 10:15 foobar
> d13~/test# rm -f foobar
> d13~/test# cp /h/tmp/foobar .
> d13~/test# ls -l foobar
> -rw-r--r-- 1 root root 0 Jun  2 10:18 foobar
> d13~/test# rm -f foobar
> d13~/test# cp --preserve=mode /h/tmp/foobar .
> cp: preserving permissions for './foobar': Operation not supported

This error message means exactly what it tells: it can't copy some
permissions, in this case posix acl.  Aka the filesystem you are copying
to lacks support for some acl parts.

Please show the output of "strace cp --preserve=mode /h/tmp/foobar .".

Bastian

-- 
	"Life and death are seldom logical."
	"But attaining a desired goal always is."
		-- McCoy and Spock, "The Galileo Seven", stardate 2821.7

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Bug#1107169: cp --preserve=mode from nfs-mounted share works but returns error Bastian Blank <waldi@debian.org> - 2025-06-03 21:20 +0200
  Processed: Re: Bug#1107169: cp --preserve=mode from nfs-mounted  share works but returns error "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-06-03 21:20 +0200
  Processed: Re: Bug#1107169: cp --preserve=mode from nfs-mounted  share works but returns error "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-06-03 21:20 +0200
  Bug#1107169: cp --preserve=mode from nfs-mounted share works but returns error Bastian Blank <waldi@debian.org> - 2025-06-03 21:50 +0200

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