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On 01/08/2012 02:58 PM, Michael Weber wrote: |
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> Hi, |
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> |
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> do you need udevd in runlevel boot at all (for sysvinit)? |
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> |
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> Given either your kernel knows its root hardware device driver or has |
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> an initrd to load needed modules to mount the root filesystem. |
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> |
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> You can have CONFIG_DEVTMPFS=y and CONFIG_DEVTMPFS_MOUNT=y and let the |
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> kernel create all the /dev/{sd,sr,hd}? device files needed for |
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> /etc/init.d/{fsck,bootmisc,localmount} to check and mount /usr. |
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> |
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> Normally you can start udevd after localmount and just right before |
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> network, to persistent-network rename the interfaces. |
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> |
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> On NFS_ROOT setups, you either have network by CONFIG_IP_PNP |
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> (kernel-level ip autoconfiguration) and get your root fs from the DHCP |
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> or you have an initrd which can mount /usr. |
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> |
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> So, all you need udevd for is fancy-permissions/groups once a non-root |
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> plugs in an USB drive (which is an multiuser-nightmare by itself). |
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> |
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> It should be sufficient to load udevd after localmount has mounted |
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> /usr udevd replays all the discoveries read from the kernel and |
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> applies the permission/ownership rules. |
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> |
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> Concern is to sustain the freedom of choice that brought me to Gentoo. |
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> |
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> Please provide systemd as an option. |
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> And provide sysvinit/openrc as an option. |
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> Do __not__ make an initrd mandatory. |
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|
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In any case, you won't need an initramfs unless /usr is on a separate |
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partition. Assuming that /usr is mounted before init starts, doesn't it |
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make sense to start udevd as early as possible, before modules, before |
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lvm, and before localmount? If we start udevd after localmount as you |
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suggest, wouldn't that imply that we don't support modular kernels? |
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-- |
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Thanks, |
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Zac |
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