From: Karel Zak <kzak@redhat.com>
To: Kay Sievers <kay@vrfy.org>
Cc: ceph-devel@vger.kernel.org, systemd-devel@lists.freedesktop.org,
Sage Weil <sage@inktank.com>
Subject: Re: [PATCH] rules: add by-parttypeuuid rule for GPT labeled partitions
Date: Tue, 13 May 2014 11:53:43 +0200 [thread overview]
Message-ID: <20140513095343.GO8951@x2.net.home> (raw)
In-Reply-To: <CAPXgP10_kwapAMsq8hgsGE3AyOuWd9uBqyb-EkP=RnNRBpeaBg@mail.gmail.com>
On Mon, May 12, 2014 at 05:18:56PM +0200, Kay Sievers wrote:
> > I just looked up libudev and it looks like there is even a pyudev wrapper,
> > so that could indeed work better. I take it that queries via
> > udev_enumerate for (say) ID_PART_ENTRY_TYPE=x are efficient?
>
> Sure, filter for "block" devices and this or other GPT properties. The
> libudev API will just find the devices is /sys and read the database
> files in tmpfs /run and, it will not talk to any devices, so it should
> perform pretty well.
and on command line lsblk(8) reads the info from udev db, so you can
use:
$ lsblk -o+PARTTYPE
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT PARTTYPE
sda 8:0 0 149.1G 0 disk
├─sda1 8:1 0 1000M 0 part /boot c12a7328-f81f-11d2-ba4b-00a0c93ec93b
├─sda2 8:2 0 2G 0 part ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
├─sda3 8:3 0 9.7G 0 part [SWAP] 0657fd6d-a4ab-43c4-84e5-0933c84b4f4f
├─sda4 8:4 0 34.2G 0 part / ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
├─sda5 8:5 0 63.2G 0 part /home ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
└─sda6 8:6 0 39.1G 0 part ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
(well, this is from git tree, will be in v2.25 :-)
Karel
--
Karel Zak <kzak@redhat.com>
http://karelzak.blogspot.com
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prev parent reply other threads:[~2014-05-13 9:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-09 21:31 [PATCH] rules: add by-parttypeuuid rule for GPT labeled partitions Sage Weil
2014-05-09 21:51 ` Kay Sievers
2014-05-09 22:00 ` [systemd-devel] " Sage Weil
2014-05-09 22:17 ` Kay Sievers
2014-05-09 22:34 ` [systemd-devel] " Sage Weil
2014-05-12 15:18 ` Kay Sievers
2014-05-13 9:53 ` Karel Zak [this message]
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