[OpenIndiana-discuss] File owner 'messagebus' ?

[Hugh McIntyre]

On 9/11/13 8:29 PM, Harry Putnam wrote:
> I've mounted a filesystem on a debian linux machine that resides on an
> opendiana (solaris x86) machine and is  zfs filesystem.
>
> I've mounted it with sshfs
>
> The linux user is the same alpha uid (reader) as the solaris user and
> both belong to the same group (same alpha and same numeric in the case
> of group).
>
> When mounted on the linux box by owner 'reader' the files owner
> appears as 'messagebus' instead of 'reader' but the group name stays
> the same (nfsu) like this:
>
> -rw-r--r-- 1 messagebus nfsu       69 Mar  9  2010 CMD
> drwxr-xr-x 1 messagebus nfsu        9 Mar  9  2010 doc
> -rw-r--r-- 1 messagebus nfsu      390 Mar 14  2010 elog_flt
>
> Anyone know what that means?

Probably that the numeric UID for user "messagebus" on the Linux side is 
the same as "reader" on the Solaris box.  I think if you use NFS4 the 
username may be reported the same, but not for other filesystems such as 
NFS3 and, presumably, sshfs.

What is almost certainly happening is that ls(1) on Linux calls stat() 
on each file, which returns a numeric uid/gid, and then the Linux box 
translates this to "messagebug" using it's password file to translate 
uid->name.

Traditionally for cases like this with NFS (and similar filesystems, but 
not SMB and generally NFS4) best practice always was to use the same 
name/uid mappings on all systems.

Hugh.