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Debian Squeeze mounting problem

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  Debian Squeeze mounting problem Richard Owlett <rowlett@cloud85.net> - 2015-10-31 16:30 +0100
    Re: Debian Squeeze mounting problem David Christensen <dpchrist@holgerdanske.com> - 2015-10-31 22:10 +0100
      Re: Debian Squeeze mounting problem Richard Owlett <rowlett@cloud85.net> - 2015-11-01 20:50 +0100
        Re: Debian Squeeze mounting problem Richard Owlett <rowlett@cloud85.net> - 2015-11-05 15:40 +0100
          ntfs, a POSSIBLE solution - was [Re: Debian Squeeze mounting problem] Richard Owlett <rowlett@cloud85.net> - 2015-11-08 20:20 +0100

#160028 — Debian Squeeze mounting problem

I'm having problems understanding 
http://manpages.debian.org/cgi-bin/man.cgi?query=mount&apropos=0&sektion=0&manpath=Debian+6.0.10+squeeze&format=html&locale=en

I have 3 partitions labeled proj-all, proj-1, and proj-2.
The machine intentionally has no networking.
There are 2 relevant but minimally privileged users [u1 and u2].
I wish to have proj-all mounted at power on with 
read/write/execute privileges for both u1 and u2.

proj-1 and/or proj-2 will be mounted separately if required.
Once mounted, u1 and u2 will each have read/write access.

How do I accomplish this.
TIA

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#160060

On 10/31/2015 08:28 AM, Richard Owlett wrote:
> I'm having problems understanding
> http://manpages.debian.org/cgi-bin/man.cgi?query=mount&apropos=0&sektion=0&manpath=Debian+6.0.10+squeeze&format=html&locale=en
>
> I have 3 partitions labeled proj-all, proj-1, and proj-2.
> The machine intentionally has no networking.
> There are 2 relevant but minimally privileged users [u1 and u2].
> I wish to have proj-all mounted at power on with read/write/execute
> privileges for both u1 and u2.
>
> proj-1 and/or proj-2 will be mounted separately if required.
> Once mounted, u1 and u2 will each have read/write access.
>
> How do I accomplish this.

I don't use labels much in Linux, but they can be helpful when I have 
multiple disk drives of the same make and model with identical 
partitioning schemes.


I use UUID's to identify partitions in /etc/fstab.  For example:

     # /boot was on /dev/sda1 during installation
     UUID=2ef32b38-2ede-491d-9d4d-e9da3282170f /boot 
      ext4        defaults,discard                    0       2


"mount" connects a disk partition containing a file system into the 
Linux file system heirarchical tree.


Traditional read, write, and execute permissions are controlled by the 
"mode" bits:

     https://en.wikipedia.org/wiki/Modes_%28Unix%29


So:

1.  If you want all users to have full access to the file system on the 
partition labeled "proj-all", then you need to create an empty directory 
(mount point), mount the partition file system into that directory, and 
set the "other" read, write, and execute mode bits of the directory once 
mounted.

2.  If you want just u1 and u2 to have full access to "proj-all", then 
you need to create an empty directory, mount the partition, create a 
group containing u1 and u2, change the group ownership of the directory 
to the group you created, set the "group" read, write, and execute bits, 
and clear the "other" bits.

3.  If you want just u1 to have full access to "proj-1", then you need 
to create an empty directory, mount the partition, and either create a 
group with just u1 and do the above, or change the user ownership of the 
directory to u1, set the "user" read, write, and execute bits, and clear 
the "group" and "other" bits.


David

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#160079

David Christensen wrote:
> On 10/31/2015 08:28 AM, Richard Owlett wrote:
>> I'm having problems understanding
>> http://manpages.debian.org/cgi-bin/man.cgi?query=mount&apropos=0&sektion=0&manpath=Debian+6.0.10+squeeze&format=html&locale=en
>>
>>
>> I have 3 partitions labeled proj-all, proj-1, and proj-2.
>> The machine intentionally has no networking.
>> There are 2 relevant but minimally privileged users [u1 and u2].
>> I wish to have proj-all mounted at power on with
>> read/write/execute
>> privileges for both u1 and u2.
>>
>> proj-1 and/or proj-2 will be mounted separately if required.
>> Once mounted, u1 and u2 will each have read/write access.
>>
>> How do I accomplish this.
>
> I don't use labels much in Linux, but they can be helpful when I
> have multiple disk drives of the same make and model with
> identical partitioning schemes.
>
>
> I use UUID's to identify partitions in /etc/fstab.  For example:
>
>      # /boot was on /dev/sda1 during installation
>      UUID=2ef32b38-2ede-491d-9d4d-e9da3282170f /boot
> ext4        defaults,discard                    0       2
>
>
> "mount" connects a disk partition containing a file system into
> the Linux file system heirarchical tree.
>
>
> Traditional read, write, and execute permissions are controlled
> by the "mode" bits:
>
>      https://en.wikipedia.org/wiki/Modes_%28Unix%29
>
>
> So:
>
> 1.  If you want all users to have full access to the file system
> on the partition labeled "proj-all", then you need to create an
> empty directory (mount point), mount the partition file system
> into that directory, and set the "other" read, write, and execute
> mode bits of the directory once mounted.
>
> 2.  If you want just u1 and u2 to have full access to "proj-all",
> then you need to create an empty directory, mount the partition,
> create a group containing u1 and u2, change the group ownership
> of the directory to the group you created, set the "group" read,
> write, and execute bits, and clear the "other" bits.
>
> 3.  If you want just u1 to have full access to "proj-1", then you
> need to create an empty directory, mount the partition, and
> either create a group with just u1 and do the above, or change
> the user ownership of the directory to u1, set the "user" read,
> write, and execute bits, and clear the "group" and "other" bits.
>
>


Thank you.
The "shape" of your answer indicates my question could be better 
phrased.
The Wikipedia reference (or one of its links) indicates the 
answer will not be of the originally desired "shape".
I think I've been given enough hints to create a workable if not 
ideal solution.

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#160225

On 11/1/2015 1:47 PM, Richard Owlett wrote:
> David Christensen wrote:
>> On 10/31/2015 08:28 AM, Richard Owlett wrote:
>>> I'm having problems understanding
>>> http://manpages.debian.org/cgi-bin/man.cgi?query=mount&apropos=0&sektion=0&manpath=Debian+6.0.10+squeeze&format=html&locale=en
>>>
>>> I have 3 partitions labeled proj-all, proj-1, and proj-2.
>>> The machine intentionally has no networking.
>>> There are 2 relevant but minimally privileged users [u1 and u2].
>>> I wish to have proj-all mounted at power on with
>>> read/write/execute
>>> privileges for both u1 and u2.
>>>
>>> proj-1 and/or proj-2 will be mounted separately if required.
>>> Once mounted, u1 and u2 will each have read/write access.
>>>
>>> How do I accomplish this.
>>
>> I don't use labels much in Linux, but they can be helpful when I
>> have multiple disk drives [snip]

My 'universe of discourse' is a _personal_ laptop with one 
hard-drive.

The set of users is intrinsically "me", "myself" and "i". Only 
"i" may use sudo.
"me" and "myself" are working on different aspects of the same 
problem and must share results. The only distinction is in 
scratch files. Debian's personalized home directories serve that 
nicely.

Labels are intrinsically unique mnemonics. UUID's would only be a 
source of confusion.

Mr. Christensen had referred me to 
https://en.wikipedia.org/wiki/Modes_%28Unix%29
I also found the following to be informative (complementing the 
man pages):
    https://en.wikipedia.org/wiki/Fstab
    https://en.wikipedia.org/wiki/Chmod
    https://en.wikipedia.org/wiki/Chown
    https://en.wikipedia.org/wiki/Ls
    https://en.wikipedia.org/wiki/Mount_(Unix)

For the moment proj-1 and proj-2 should be considered 
appropriately formatted and labeled USB flash drives. When one or 
other or both are plugged in, they shall be immediately available 
WITHOUT operator intervention. FAT32 would work except for file 
size limitations.

The laptop being used is dedicated to this project and to me 
learning ins and outs of Debian. Due to later I've wiped the disk 
and reinstalled multiple times in a single day. [If retirement is 
not for education, of what use might it be ;]

Thank you for your time.

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#160321 — ntfs, a POSSIBLE solution - was [Re: Debian Squeeze mounting problem]

On 11/5/2015 8:33 AM, Richard Owlett wrote:
> On 11/1/2015 1:47 PM, Richard Owlett wrote:
>> David Christensen wrote:
>>> On 10/31/2015 08:28 AM, Richard Owlett wrote:
>>>> I'm having problems understanding
>>>> http://manpages.debian.org/cgi-bin/man.cgi?query=mount&apropos=0&sektion=0&manpath=Debian+6.0.10+squeeze&format=html&locale=en
>>>>
>>>>
>>>> I have 3 partitions labeled proj-all, proj-1, and proj-2.
>>>> The machine intentionally has no networking.
>>>> There are 2 relevant but minimally privileged users [u1 and u2].
>>>> I wish to have proj-all mounted at power on with
>>>> read/write/execute
>>>> privileges for both u1 and u2.
>>>>
>>>> proj-1 and/or proj-2 will be mounted separately if required.
>>>> Once mounted, u1 and u2 will each have read/write access.
>>>>
>>>> How do I accomplish this.
>>>
>>> I don't use labels much in Linux, but they can be helpful when I
>>> have multiple disk drives [snip]
>
> My 'universe of discourse' is a _personal_ laptop with one
> hard-drive.
>
> The set of users is intrinsically "me", "myself" and "i". Only
> "i" may use sudo.
> "me" and "myself" are working on different aspects of the same
> problem and must share results. The only distinction is in
> scratch files. Debian's personalized home directories serve that
> nicely.
>
> Labels are intrinsically unique mnemonics. UUID's would only be a
> source of confusion.
>
> Mr. Christensen had referred me to
> https://en.wikipedia.org/wiki/Modes_%28Unix%29
> I also found the following to be informative (complementing the
> man pages):
>     https://en.wikipedia.org/wiki/Fstab
>     https://en.wikipedia.org/wiki/Chmod
>     https://en.wikipedia.org/wiki/Chown
>     https://en.wikipedia.org/wiki/Ls
>     https://en.wikipedia.org/wiki/Mount_(Unix)
>
> For the moment proj-1 and proj-2 should be considered
> appropriately formatted and labeled USB flash drives. When one or
> other or both are plugged in, they shall be immediately available
> WITHOUT operator intervention. FAT32 would work except for file
> size limitations.
>
> The laptop being used is dedicated to this project and to me
> learning ins and outs of Debian. Due to later I've wiped the disk
> and reinstalled multiple times in a single day. [If retirement is
> not for education, of what use might it be ;]
>
> Thank you for your time.
>

On a USENET group discussing an unrelated topic I came across 
partitions formatted as ntfs. I had seen the acronym before, but 
never investigated it.

A minimal reading suggests that Debian's default action when 
asked to mount a ntfs partition will make the owner to be 'root' 
and give all others read/write access. That will _apparently_ 
meet my requirements as the machine in question does *NOT* have 
any possible network connectivity whatsoever and I am the *ONLY* 
one with physical access.

If I actually understand some particulars of what I read, ACL 
{Access Control Lists} would allow me to store information WITHIN 
SAID partition to control permissions.

If I'm clueless, please inform me.
P.S. Over the decades, I have found that when entering a unknown 
office complex I have found that asking Receptionist, "Would you 
like to tell someone 'Where to go'?"
[GRIN}

Owl now DUCKs for cover ;/

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