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>>>>>>>> My new laptop uses /dev/nvme0n1 instead of /dev/sda which 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 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 want |
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>>>>>>> the nvme disk to show up as /dev/sda, and the USB disk(s) to show 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 the |
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>>>>>>> /dev/sdX device namespace, and will sequentially create devices nodes |
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>>>>>>> for SCSI-like block devices using that namespace. There is no way 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, 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 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 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 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 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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> Network devices don't have device nodes. They have interface names, |
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> which are a different concept entirely. |
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OK I'll take your advice and change the script to detect /dev/nvme0n1. |
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- Grant |
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