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Subject: bug#39905: Why does parted change ownerships of devices?
Resent-From: Guillaume Abrioux <gabrioux@HIDDEN>
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From: Guillaume Abrioux <gabrioux@HIDDEN>
Date: Wed, 4 Mar 2020 16:01:51 +0100
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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@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@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@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@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/pa=
rted.py#L418


*Guillaume Abrioux*
Senior Software Engineer

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<div dir=3D"ltr"><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=
=3D"gmail_signature"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><di=
v dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=
=3D"ltr"><div style=3D"background-color:rgb(253,253,253)"><span style=3D"co=
lor:rgb(102,102,102)"><span style=3D"font-size:8pt"></span></span><span sty=
le=3D"background-color:rgb(255,255,255)">Hello,</span><span style=3D"color:=
rgb(102,102,102)"><span style=3D"font-size:8pt"><br></span></span></div><br=
>We use parted in ceph-ansible playbook [1] to retrieve some devices inform=
ation, the parted ansible module runs a parted/print command [2], but we ar=
e facing an issue where ownerships get modified after that.<br><br>Doing th=
e test manually without ansible context shows it&#39;s parted itself which =
apply this change:<br><br>Before running parted on /dev/sdc:<br>[root@osd0 =
~]# ls -l /dev/sdc*<br>brw-rw----. 1 root disk 8, 32 Jun 11 08:53 /dev/sdc<=
br>brw-rw----. 1 ceph ceph 8, 33 Jun 11 08:53 /dev/sdc1<br>brw-rw----. 1 ce=
ph ceph 8, 34 Jun 11 08:53 /dev/sdc2<br><br>Running a basic parted/print:<b=
r>[root@osd0 ~]# parted -s /dev/sdc print =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0<br>Model: ATA QEMU HARDDISK (scsi)<br>Disk /dev/sdc: 53.7GB<br>S=
ector size (logical/physical): 512B/512B<br>Partition Table: gpt<br>Disk Fl=
ags:<br><br>Number =C2=A0Start =C2=A0 End =C2=A0 =C2=A0 Size =C2=A0 =C2=A0F=
ile system =C2=A0Name =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Flags<br>=C2=A01 =
=C2=A0 =C2=A0 =C2=A01049kB =C2=A01075MB =C2=A01074MB =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 ceph block.db<br>=C2=A02 =C2=A0 =C2=A0 =C2=A010=
75MB =C2=A02149MB =C2=A01074MB =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 ceph block.db<br><br>We can see ownerships have changed from ceph:ce=
ph to root:disk:<br>[root@osd0 ~]# ls -l /dev/sdc* =C2=A0 =C2=A0 =C2=A0 =C2=
=A0<br>brw-rw----. 1 root disk 8, 32 Jun 11 08:57 /dev/sdc<br>brw-rw----. 1=
 root disk 8, 33 Jun 11 08:57 /dev/sdc1<br>brw-rw----. 1 root disk 8, 34 Ju=
n 11 08:57 /dev/sdc2<br>[root@osd0 ~]# <br><br>I&#39;m wondering whether th=
ere&#39;s a good reason for this or should it be considered as a bug?<br><b=
r><br>Thanks!<br><br><br>[1] <a href=3D"https://github.com/ceph/ceph-ansibl=
e/blob/master/roles/ceph-osd/tasks/main.yml#L39-L44">https://github.com/cep=
h/ceph-ansible/blob/master/roles/ceph-osd/tasks/main.yml#L39-L44</a><br>[2]=
 <a href=3D"https://github.com/ansible/ansible/blob/devel/lib/ansible/modul=
es/system/parted.py#L418">https://github.com/ansible/ansible/blob/devel/lib=
/ansible/modules/system/parted.py#L418</a><br><span style=3D"color:rgb(102,=
102,102)"><span style=3D"font-size:8pt"><span><span><span></span></span></s=
pan></span></span></div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><div cl=
ass=3D"gmail_default" style=3D"font-family:tahoma,sans-serif"></div><div><d=
iv dir=3D"ltr" class=3D"gmail_signature"><div dir=3D"ltr"><div dir=3D"ltr">=
<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div di=
r=3D"ltr"><div dir=3D"ltr"><div style=3D"background-color:rgb(253,253,253)"=
><span style=3D"color:rgb(102,102,102)"><span style=3D"font-size:x-large"><=
span style=3D"font-size:11pt"><b>Guillaume Abrioux<br></b></span></span></s=
pan></div></div></div></div></div></div></div></div></div></div></div><div =
class=3D"gmail_default" style=3D"font-family:tahoma,sans-serif"><span style=
=3D"font-size:8pt;color:rgb(102,102,102);background-color:rgb(253,253,253);=
font-family:Arial,Helvetica,sans-serif">Senior Software Engineer</span></di=
v><br><br></div></div></div></div></div></div></div></div></div></div>

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Guillaume Abrioux <gabrioux@HIDDEN>
Subject: bug#39905: Acknowledgement (Why does parted change ownerships of
 devices?)
Message-ID: <handler.39905.B.15833342186067.ack <at> debbugs.gnu.org>
References: <CANqTTH58TK4KZ8aZiATJG6nD1VE+LXcAiA9qfTsXoviZcdBXog@HIDDEN>
X-Gnu-PR-Message: ack 39905
X-Gnu-PR-Package: parted
Reply-To: 39905 <at> debbugs.gnu.org
Date: Wed, 04 Mar 2020 15:04:02 +0000

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Message sent to bug-parted@HIDDEN:

Subject: bug#39905: Why does parted change ownerships of devices?
Resent-From: "Brian C. Lane" <bcl@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
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To: Guillaume Abrioux <gabrioux@HIDDEN>
Cc: 39905 <at> debbugs.gnu.org
Date: Wed, 4 Mar 2020 09:32:38 -0800
From: "Brian C. Lane" <bcl@HIDDEN>
Message-ID: <20200304173238.GE23744@HIDDEN>
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On Wed, Mar 04, 2020 at 04:01:51PM +0100, Guillaume Abrioux wrote:
> Hello,
>=20
> We use parted in ceph-ansible playbook [1] to retrieve some devices
> information, the parted ansible module runs a parted/print command [2], b=
ut
> we are facing an issue where ownerships get modified after that.
>=20
> 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?

--=20
Brian C. Lane (PST8PDT) - weldr.io - lorax - parted - pykickstart

Last modified: Wed, 4 Mar 2020 17:45:01 UTC

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