From: Mike Gilbert <floppym@gentoo.org>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Rename /dev/nvme0n1 to /dev/sda
Date: Mon, 4 Sep 2017 11:40:33 -0400 [thread overview]
Message-ID: <CAJ0EP41Ttb4pxRKm6aJPjnzr31J8bhtiVtUw4forCQObL2Z4Sg@mail.gmail.com> (raw)
In-Reply-To: <CAN0CFw1ms_aY4+8n74D6D1r90KtEenPmEdX21gvUd6RwdjewwA@mail.gmail.com>
On Mon, Sep 4, 2017 at 11:00 AM, Grant <emailgrant@gmail.com> wrote:
>>>>>>> My new laptop uses /dev/nvme0n1 instead of /dev/sda which conflicts
>>>>>>> with the script I use to manage about 12 similar laptops running
>>>>>>> Gentoo. Is there a udev method for renaming the disk that will work
>>>>>>> well with any USB disks that happen to also be attached?
>>>>>>
>>>>>> I'm not certain what you mean by that, but I would guess that you want
>>>>>> the nvme disk to show up as /dev/sda, and the USB disk(s) to show up
>>>>>> as /dev/sd[b-z].
>>>>>>
>>>>>> It is not possible to accomplish this using udev; the kernel owns the
>>>>>> /dev/sdX device namespace, and will sequentially create devices nodes
>>>>>> for SCSI-like block devices using that namespace. There is no way to
>>>>>> change that using a udev rule.
>>>>>
>>>>>
>>>>> Can I rename /dev/sda to /dev/sd[b-z] if it's attached via USB, and
>>>>> then rename /dev/nvme0n1 to /dev/sda if /dev/nvme0n1 exists?
>>>>>
>>>>> Alternatively, can I rename /dev/sda to /dev/sd[b-z] if /dev/sda and
>>>>> /dev/nvme0n1 exist, and then rename /dev/nvme0n1 to /dev/sda if
>>>>> /dev/nvme0n1 exists?
>>>>
>>>> You might technically be able to do it, but I would guess it would
>>>> cause some nasty race conditions between the kernel and udev. It's a
>>>> bad idea.
>>>
>>>
>>> Is it the conditionals that cause this to be a bad idea? Because I
>>> believe udev has functionality designed to rename devices exactly like
>>> this.
>>
>> udev doesn't provide any functionality to rename device nodes. You can
>> adjust their permissions, and create symlinks, but there is no direct
>> way to rename them.
>
>
> I use stuff like this to rename my USB devices and it works perfectly:
>
> SUBSYSTEM=="net", ACTION=="add", ENV{ID_NET_NAME_PATH}=="enp0s20u2u1",
> NAME="net0"
>
> Isn't this a true rename of the device node?
Network devices don't have device nodes. They have interface names,
which are a different concept entirely.
next prev parent reply other threads:[~2017-09-04 15:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-01 16:10 [gentoo-user] Rename /dev/nvme0n1 to /dev/sda Grant
2017-09-02 2:58 ` R0b0t1
2017-09-02 6:48 ` Andrew Savchenko
2017-09-02 13:14 ` Canek Peláez Valdés
2017-09-03 17:59 ` Grant
2017-09-03 18:11 ` Canek Peláez Valdés
2017-09-04 4:26 ` J. Roeleveld
2017-09-04 5:08 ` Canek Peláez Valdés
2017-09-02 14:35 ` Mike Gilbert
2017-09-03 18:11 ` Grant
2017-09-03 22:24 ` Mike Gilbert
2017-09-03 22:41 ` Grant
2017-09-04 1:26 ` Mike Gilbert
2017-09-04 1:38 ` Rich Freeman
2017-09-04 14:58 ` Grant
2017-09-04 15:00 ` Grant
2017-09-04 15:33 ` J. Roeleveld
2017-09-04 15:40 ` Mike Gilbert [this message]
2017-09-04 19:22 ` Grant
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