В Wed, 07 May 2014 13:32:39 +0200
Harald Hoyer <harald@xxxxxxxxxx> пишет:
> On 07.05.2014 13:12, Thomas Renninger wrote:
> > Hi,
> >
> > I wonder for what this one is exactly for?
> >
> > commit ab9457efd78ff74c654b4123956cdbd131935066
> > Author: Harald Hoyer <harald@xxxxxxxxxx>
> > Date: Tue Feb 25 12:35:32 2014 +0100
> >
> > Add flag to toggle hostonly cmdline storing in the initramfs
> >
> > --hostonly-cmdline:
> > Store kernel command line arguments needed in the initramfs
> >
> > --no-hostonly-cmdline:
> > Do not store kernel command line arguments needed in the initramfs
> >
> >
> >
> > Wouldn't it be enough to simply add hostonly command line parameters
> > only in hostonly case like:
> > + if [[ $hostonly == "yes" ]]; then
> > + cmdline >> "${initdir}/etc/cmdline.d/90mdraid.conf"
> > + echo >> "${initdir}/etc/cmdline.d/90mdraid.conf"
> > + fi
> >
> > why is a hostonly-cmdline extra parameter needed?
> >
> > Thanks,
> >
> > Thomas
> >
>
> hostonly stores config files like mdadm.conf and only installs those kernel
> modules, which are specific to the machine.
>
> hostonly-cmdline also stores dracut specific kernel cmdline parameters to boot
> the system in the initramfs, so that basically you could boot the system by
> only specifying "root=" on the kernel cmdline.
>
> The advantage of hostonly-cmdline is that the kernel cmdline does not need
> complex rd.md.uuid=... or rd.luks.uuid=... parameters.
>
> The disadvantage is that in case of uuid or disk changes, you cannot alter the
> parameters which are in the initramfs.
>
> I suggest to use the output of:
>
> # dracut --print-cmdline
>
> and add it to the kernel command line.
>
> hostonly-cmdline should only be used, when e.g. the maximum char limit of the
> kernel command line would be reached or when the user has a generic rescue
> image, to be used when the disk layout changed and the user has not generated a
> new initramfs with it.
>
> Maybe we could let hostonly-cmdline be the default and add a parameter
> "rd.cmdline.conf=0", which turns of parsing $initrd/etc/cmdline.d/*.conf.
>
> Thoughts?
Actually hostonly-cmdline is partially broken with systemd in
initramfs. For example systemd-cryptsetup-generator does not
read /etc/cmdline.d/*.conf files, so rd.luks* parameters must be
appended to kernel cmdline anyway.
--
Alexander Tsoy
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