[Samba] Samba 4 provisioning error on Ubuntu 12.04

[Rowland Penny]

On 21/06/12 12:30, Rowland Penny wrote:
> On 21/06/12 10:16, steve wrote:
>> On 06/21/2012 10:24 AM, Rowland Penny wrote:
>>> On 21/06/12 07:42, steve wrote:
>>>> On 06/21/2012 08:27 AM, Andrew Bartlett wrote:
>>>>> On Wed, 2012-06-20 at 14:17 -0700, todd kman wrote:
>>>>> Let's start from the top: - Is libacl-dev1 installed on your system?
>>>> ** I think that should be:
>>>> libacl1-dev
>>>>
>>>> Here is the fstab entry on a working 12.04:
>>>> UUID=f99d4f08-6123-4941-8ee2-a260d22ddce5 / ext4 
>>>> errors=remount-ro,acl,user_xattr 0 1
>>>>
>>>> HTH
>>>> Steve
>>>>
>>> Hmm, this is interesting, this is what I have in my /etc/fstab on 
>>> Ubuntu 12.04 server
>>>
>>> # /etc/fstab: static file system information.
>>> # / was on /dev/sda1 during installation
>>> UUID=63c10807-be9a-4aed-bf2f-fa52e53fc162 /               ext4    
>>> errors=remount-ro 0       1
>>> # /home was on /dev/sda6 during installation
>>> UUID=3826e336-978b-43e6-b02f-83694b132ed3 /home           ext4    
>>> defaults        0       2
>>>
>>> cat /proc/mounts
>>> Shows:
>>> /dev/disk/by-uuid/63c10807-be9a-4aed-bf2f-fa52e53fc162 / ext4 
>>> rw,relatime,errors=remount-ro,user_xattr,barrier=1,data=ordered 0 0
>>> /dev/sda6 /home ext4 rw,relatime,user_xattr,barrier=1,data=ordered 0 0
>>>
>>> This passes the acl test on 
>>> https://wiki.samba.org/index.php/Samba4/HOWTO even though acl is not 
>>> mentioned (it is installed) and Samba4 from git compiles and 
>>> installs ok.
>>> Do I need to add acl to my /etc/fstab lines? user_xattr seems to be 
>>> a default setting.
>>>
>>> Rowland
>>>
>>>
>> Hi Rowland
>> My Samba4 is installed at /usr/local/bin on the / partition of the 
>> disk so I added acl,user_xattr to the / line in fstab and rebuilt 
>> with libacl1-dev installed, having read a post on the Ubuntu forum. 
>> Before this, I had the same s3fs error when provisioning.
>>
>> /proc/mounts here gives the same output as yours so It looks as if 
>> the acl parameter is not needed, but no harm in trying. Are you able 
>> to reboot if you change fstab? If my memory server me correctly, 
>> remounting didn't work.
>>
>> Sorry can't be more positive.
>> Cheers,
>> Steve
>>
> Well, I could try adding acl to the relevant /etc/fstab lines but as I 
> said Samba4 compiled, installed & provisioned without complaining 
> about it being missing. The acl test from the howto was passed on the 
> relevant partitions, so I am wondering if I do need to alter my 
> /etc/fstab.
> Is there anybody out there, with more knowledge than me, who can 
> confirm one way or the other?
>
> Rowland
>
Well, after a bit of thought and downloading the kernel source from 
Ubuntu, I am answering my own question.

This is from the source file for the kernel that Ubuntu 12.04 uses 
(3.2.0-25)

It comes from "Documentation/filesystems/ext4.txt"

nouser_xattr        Disables Extended User Attributes. If you have extended
                             attribute support enabled in the kernel 
configuration
                             (CONFIG_EXT4_FS_XATTR), extended attribute 
support
                             is enabled by default on mount. See the 
attr(5) manual
                             page and http://acl.bestbits.at/ for more 
information
                             about extended attributes.

noacl                   This option disables POSIX Access Control List
                             support. If ACL support is enabled in the 
kernel
                             configuration (CONFIG_EXT4_FS_POSIX_ACL), 
ACL is
                             enabled by default on mount. See the acl(5) 
manual
                             page and http://acl.bestbits.at/ for more 
information
                             about acl.

If I run:
cat /boot/config-3.2.0-25-generic | grep CONFIG_EXT4
I get:
CONFIG_EXT4_FS=y
CONFIG_EXT4_FS_XATTR=y
CONFIG_EXT4_FS_POSIX_ACL=y
CONFIG_EXT4_FS_SECURITY=y
# CONFIG_EXT4_DEBUG is not set

I would suggest that, as I thought, you do not have to add anything to 
/etc/fstab to get acl's, in fact you have to add something to turn them off.

Rowland



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