GNU bug report logs - #39905
Why does parted change ownerships of devices?

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Guillaume Abrioux <gabrioux <at> redhat.com>
To: bug-parted <at> gnu.org
Subject: Why does parted change ownerships of devices?
Date: Wed, 4 Mar 2020 16:01:51 +0100

[Message part 1 (text/plain, inline)]

Hello,

We use parted in ceph-ansible playbook [1] to retrieve some devices
information, the parted ansible module runs a parted/print command [2], but
we are facing an issue where ownerships get modified after that.

Doing the test manually without ansible context shows it's parted itself
which apply this change:

Before running parted on /dev/sdc:
[root <at> osd0 ~]# ls -l /dev/sdc*
brw-rw----. 1 root disk 8, 32 Jun 11 08:53 /dev/sdc
brw-rw----. 1 ceph ceph 8, 33 Jun 11 08:53 /dev/sdc1
brw-rw----. 1 ceph ceph 8, 34 Jun 11 08:53 /dev/sdc2

Running a basic parted/print:
[root <at> osd0 ~]# parted -s /dev/sdc print
Model: ATA QEMU HARDDISK (scsi)
Disk /dev/sdc: 53.7GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system  Name           Flags
 1      1049kB  1075MB  1074MB               ceph block.db
 2      1075MB  2149MB  1074MB               ceph block.db

We can see ownerships have changed from ceph:ceph to root:disk:
[root <at> osd0 ~]# ls -l /dev/sdc*
brw-rw----. 1 root disk 8, 32 Jun 11 08:57 /dev/sdc
brw-rw----. 1 root disk 8, 33 Jun 11 08:57 /dev/sdc1
brw-rw----. 1 root disk 8, 34 Jun 11 08:57 /dev/sdc2
[root <at> osd0 ~]#

I'm wondering whether there's a good reason for this or should it be
considered as a bug?


Thanks!


[1]
https://github.com/ceph/ceph-ansible/blob/master/roles/ceph-osd/tasks/main.yml#L39-L44
[2]
https://github.com/ansible/ansible/blob/devel/lib/ansible/modules/system/parted.py#L418


*Guillaume Abrioux*
Senior Software Engineer

[Message part 2 (text/html, inline)]

Message #8 received at 39905 <at> debbugs.gnu.org (full text, mbox):

From: "Brian C. Lane" <bcl <at> redhat.com>
To: Guillaume Abrioux <gabrioux <at> redhat.com>
Cc: 39905 <at> debbugs.gnu.org
Subject: Re: bug#39905: Why does parted change ownerships of devices?
Date: Wed, 4 Mar 2020 09:32:38 -0800

On Wed, Mar 04, 2020 at 04:01:51PM +0100, Guillaume Abrioux wrote:
> Hello,
> 
> We use parted in ceph-ansible playbook [1] to retrieve some devices
> information, the parted ansible module runs a parted/print command [2], but
> we are facing an issue where ownerships get modified after that.
> 
> Doing the test manually without ansible context shows it's parted itself
> which apply this change:

No, parted doesn't do anything to ownership or permissions. My guess is
that udev is doing something when the device is opened/closed. How does
ceph set the ownership?

-- 
Brian C. Lane (PST8PDT) - weldr.io - lorax - parted - pykickstart

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