Re: [yocto] [OE-core] Questions about udev rule and systemd-udev，relevant to mounting block device

[Vincent Prince]

Hi,

I'm not sure what is your use case, but you can check usbmount[1][2]
or automount-usb[3] for example on how to use udev with systemd:

Regards,
Vincent

[1]https://github.com/rbrito/usbmount
[2]
https://github.com/nefethael/meta-random/blob/master/recipes-support/usbmount/usbmount_git.bb
[3]https://github.com/six-k/automount-usb


2018-03-02 6:44 GMT+01:00 Hongzhi, Song :

> Hi all,
>
> Does anyone have suggestion for me?
>
> Thanks.
>
> Hongzhi.Song
>
> On 2018年03月01日 18:35, Hongzhi, Song wrote:
>
> Defect:
>
> The exiting method of automount of udev in *oe-core/meta/ *is using
>
> *automount.rules* which call *mount.sh* that using */bin/mount* to mount
> device.
>
> But systemd-udevd detaches *mount()* operations done within the service
>
> from the rest of the system with MountFlag=slave， this means host can
>
> not access device. (e.g. Executing *mkfs.ext4 /dev/sda1/* prompts
>
> */dev/sda1 is apparently in use by the system; will not make a filesystem
> here!*)
>
>
> Solution:
>
> Systemd upstream suggest that the best way is to use "systemd-mount"
>
> in udev rules, which will request the mount operation to be executed by
> PID 1.
>
> And I have tested it was effective.
>
>
> Uncertain：
>
> The exiting method is designed for *SysV-init *which is not
> compatible to
>
> systemd-udev, at least that's what I think. So I think that we should
> design
>
> a new rule or organizational structure to be suitable for systemd-udev and
>
> to mount deferent device. Dose anyone help do this? Or I can make some
>
> improvements on the basis of the existing with "systemd-mount".
>
>
>
>
> --
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> openembedded-c...@lists.openembedded.org
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>
>
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Re: [yocto] [OE-core] Questions about udev rule and systemd-udev，relevant to mounting block device

[Hongzhi, Song]

Hi all,

Does anyone have suggestion for me?

Thanks.

Hongzhi.Song


On 2018年03月01日 18:35, Hongzhi, Song wrote:


Defect:

    The exiting method of automount of udev in /oe-core/meta/ /is using

/automount.rules/ which call /mount.sh/ that using //bin/mount/ to 
mount device.


But systemd-udevd detaches /mount()/ operations done within the service

from the rest of the system with MountFlag=slave， this means host can

not access device. (e.g. Executing /mkfs.ext4 /dev/sda1// prompts

//dev/sda1 is apparently in use by the system; will not make a 
filesystem here!/)



Solution:

    Systemd upstream suggest that the best way is to use "systemd-mount"

in udev rules, which will request the mount operation to be executed 
by PID 1.


And I have tested it was effective.


Uncertain：

    The exiting method is designed for /SysV-init /which is not 
compatible to


systemd-udev, at least that's what I think. So I think that we should 
design


a new rule or organizational structure to be suitable for systemd-udev 
and


to mount deferent device. Dose anyone help do this? Or I can make some

improvements on the basis of the existing with "systemd-mount".





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