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

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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

#87828 — Bug#1107169: cp --preserve=mode from nfs-mounted share works but returns error

Control: tags -1 moreinfo

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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#87829 — Processed: Re: Bug#1107169: cp --preserve=mode from nfs-mounted share works but returns error

Processing control commands:

> tags -1 moreinfo
Bug #1107169 [nfs-common] cp --preserve=mode from nfs-mounted share works but returns error
Added tag(s) moreinfo.

-- 
1107169: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1107169
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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#87830 — Processed: Re: Bug#1107169: cp --preserve=mode from nfs-mounted share works but returns error

Processing control commands:

> tags -1 moreinfo
Bug #1107169 [nfs-common] cp --preserve=mode from nfs-mounted share works but returns error
Ignoring request to alter tags of bug #1107169 to the same tags previously set

-- 
1107169: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1107169
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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#87835

Control: reassign -1 coreutils

On Tue, Jun 03, 2025 at 07:34:49PM +0000, bls 3427 wrote:
> Also, as far as I can tell, the source file does not have any ACLs on it. 

> fsetxattr(4, "system.nfs4_acl", "\0\0\0\3\0\0\0\0\0\0\0\0\0\26\1\207\0\0\0\6OWNER@\0\0\0\0\0", 80, 0) = -1 EOPNOTSUPP (Operation not supported)

It does, it has nfs4 acl and nfs acl are not supported for everything
except nfs.  But why would cp try to copy that?

I'm reassigning this to coreutils, which provides cp.

Bastian

-- 
Bones: "The man's DEAD, Jim!"

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