[RFC] new initctl command

[Scott James Remnant]

A few notes:

 - the D-Bus command needs to issue a method return to allow the initctl
command to exit ;-)

 - I would say you should move /proc, /sys & /dev over simply because
Upstart happens to use two of those, and it makes everyone's lives easier


On Wed, Jun 15, 2011 at 8:06 AM, Surbhi Palande <
surbhi.palande at canonical.com> wrote:

> Hi Scott,
>
> I have uploaded a new diff for the new initctl "pivot" command at:
>
> https://code.launchpad.net/~csurbhi/upstart/upstart-add-pivot-handling
>
> Background:
> --------------
> The pivot command is used for changing the root filesystem in the initramfs
> from the memory based "/" to the disk based real root filesystem. This
> command can be issued as follows:
>
> initctl pivot <ROOTFS> <INIT>
>
> where ROOTFS is the root filesystem that we want to move to while in the
> initramfs. INIT is the first program that we wish to execute once this move
> to the real root filesystem is made.
>
> This command is intended to be used when upstart is executed in initramfs
> for making the initramfs event driven.
>
> It is assumed that a user can specify a different ROOTFS, INIT or arguments
> to this new INIT at the grub command prompt. The console used for logging
> the messages is /dev/console and is a not a boot argument which can be
> changed.
>
> This command has no effect when it is executed from a non memory based root
> filesystem.
> ---------------
>
> The uploaded diff has the following changes:
>
> 1. Added the pivot related code in pivot.c, pivot.h.
> 2. Added support for compiling pivot.c
> 3. Made the code in pivot.c modular.
> 4. Added the handling of moving the virtual filesystem from / to the
> requested new rootfs.
> 5. The default console used is /dev/console. No other console can be
> specified. However, if we want to make the console device a boot parameter
> or a command line argument for the pivot command then this can be added.
> Would like to know views on this. Currently at least Ubuntu's initramfs does
> not change the console when it executes run_init.
>
> I would also love to know any views on whether the pivot command is the
> right place to handle the moving of the virtual filesystems (/dev, /proc,
> /sys to @rootfs/). Personally, I think that this virtual filesystem movement
> is needed _only_ for the correct execution of the pivot command and so it
> should be handled by the pivot command.
>
> Please do let me know your views on this diff. Thanks a lot!
>
> Warm Regards,
> Surbhi.
>
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