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On 4 September 2017 17:00:30 GMT+02:00, Grant <emailgrant@×××××.com> wrote: |
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>>>>>>> My new laptop uses /dev/nvme0n1 instead of /dev/sda which |
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>conflicts |
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>>>>>>> with the script I use to manage about 12 similar laptops running |
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>>>>>>> Gentoo. Is there a udev method for renaming the disk that will |
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>work |
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>>>>>>> well with any USB disks that happen to also be attached? |
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>>>>>> |
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>>>>>> I'm not certain what you mean by that, but I would guess that you |
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>want |
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>>>>>> the nvme disk to show up as /dev/sda, and the USB disk(s) to show |
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>up |
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>>>>>> as /dev/sd[b-z]. |
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>>>>>> |
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>>>>>> It is not possible to accomplish this using udev; the kernel owns |
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>the |
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>>>>>> /dev/sdX device namespace, and will sequentially create devices |
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>nodes |
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>>>>>> for SCSI-like block devices using that namespace. There is no way |
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>to |
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>>>>>> change that using a udev rule. |
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>>>>> |
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>>>>> |
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>>>>> Can I rename /dev/sda to /dev/sd[b-z] if it's attached via USB, |
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>and |
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>>>>> then rename /dev/nvme0n1 to /dev/sda if /dev/nvme0n1 exists? |
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>>>>> |
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>>>>> Alternatively, can I rename /dev/sda to /dev/sd[b-z] if /dev/sda |
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>and |
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>>>>> /dev/nvme0n1 exist, and then rename /dev/nvme0n1 to /dev/sda if |
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>>>>> /dev/nvme0n1 exists? |
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>>>> |
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>>>> You might technically be able to do it, but I would guess it would |
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>>>> cause some nasty race conditions between the kernel and udev. It's |
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>a |
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>>>> bad idea. |
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>>> |
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>>> |
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>>> Is it the conditionals that cause this to be a bad idea? Because I |
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>>> believe udev has functionality designed to rename devices exactly |
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>like |
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>>> this. |
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>> |
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>> udev doesn't provide any functionality to rename device nodes. You |
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>can |
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>> adjust their permissions, and create symlinks, but there is no direct |
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>> way to rename them. |
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> |
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> |
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>I use stuff like this to rename my USB devices and it works perfectly: |
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> |
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>SUBSYSTEM=="net", ACTION=="add", ENV{ID_NET_NAME_PATH}=="enp0s20u2u1", |
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>NAME="net0" |
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> |
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>Isn't this a true rename of the device node? |
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> |
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>- Grant |
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|
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For network devices I tend to use the MAC addresses. |
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|
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USB devices get a different name if you plug it into a different port. |
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|
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-- |
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Joost |
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-- |
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Sent from my Android device with K-9 Mail. Please excuse my brevity. |
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