On Fri, 15 Jun 2018 10:41:02 +0100, RobH wrote:

> On 15/06/18 00:32, Dennis Lee Bieber wrote:
>> On Thu, 14 Jun 2018 20:04:35 +0100, RobH  declaimed
>> the following:
>>
>>
>>> pi@raspberrypi:/mnt $ ls -l total 4 drwxrwxrwx 3 pi pi 4096 Jun  5
>>> 09:50 CCTV
>>>
>>>
>>  Try
>>
>> ls -lR
>>
>> and ensure that ALL directories, not just CCTV, have been changed.
>>
>>
>>  The other side of the coin (recall, I do not have a NAS unit) is
that
>> the NAS may need to be configured with privileges for users.
>>
>>  Forget about running the capture script... You need to get
everything
>> working from the command line first...
>>
>> Create some garbage file in your home directory
>>
>> $ date >~/junk.txt
>>
>> Then try moving that file to the mount point...
>>
>> $ mv ~/junk.txt /mnt/CCTV/PiZero/junk.txt
>>
>> That should represent what the script is trying to do.
>>
>>
>>
>>
>>
> After creating the junk.txt file and moving it:
> pi@raspberrypi:~ $ mv ~/junk.txt /mnt/CCTV/PiZero/junk.txt mv:
> preserving times for '/mnt/CCTV/PiZero/junk.txt': Operation not
> permitted mv: preserving permissions for ‘/mnt/CCTV/PiZero/junk.txt’:
> Input/output error
>
> The said file was moved to my NAS box on /mnt/CCTV/PiZero and shows as
> 29 bytes but could not be opened. Because it is owned by root.
>
>
> My NAS box is configured to accept connections and files from my CCTV
> cameras, so there is not the problem.
>
> One thing I have noticed, and why I never mentioned before , I don't
> know.
>
> When I do ls on the root of pi:
>
> pi@raspberrypi:~ $ ls Desktop    Downloads  Public    Templates
> Documents  Music      Pictures  python_games  Videos pi@raspberrypi:~ $
>
> the /mnt directory is not listed or showing, and that is because ls only
> lists what is under /pi   while /mnt is under /
>
> Just out of interest, I have created a /mnt directory under /pi, and
> also CCTV/PiZero, then changed permissions and ownership for all the
> directories.
>
> I am not sure but the python script might get confused as to which /mnt
> directory it should use.
>
> Advise please

Get one of the recommended Linux books and read the chapter on file
ownership and permissions. Until you understand the concepts and how they
work together you'll continue to struggle with this area.

The way Linux enforces file ownership and access to files is very
different from Windows. In the latter where these concepts are almost
nonexistent because Windows is and always was fundamentally a single-user
system with a bit of rudimentary multi-user stuff bolted on while Linux
inherited its multi-user way  of working, and the aim of actively
preventing users from interfering with each other from Unix.


--
Martin    | martin at
Gregorie  | gregorie dot org

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