| 1 |
On 2012-12-23, Alan Mackenzie wrote: |
| 2 |
|
| 3 |
> On Sun, Dec 23, 2012 at 07:03:25PM +0200, Nuno J. Silva wrote: |
| 4 |
>> On 2012-12-23, Alan McKinnon wrote: |
| 5 |
> |
| 6 |
>> > On Sun, 23 Dec 2012 12:22:24 +0200 |
| 7 |
>> > nunojsilva@×××××××.pt (Nuno J. Silva) wrote: |
| 8 |
> |
| 9 |
>> >> On 2012-12-18, Alan McKinnon wrote: |
| 10 |
> |
| 11 |
>> >> > On Tue, 18 Dec 2012 09:08:53 -0500 |
| 12 |
>> >> > Michael Mol <mikemol@×××××.com> wrote: |
| 13 |
> |
| 14 |
> |
| 15 |
>> >> > This sentence summarizes my understanding of your post nicely: |
| 16 |
> |
| 17 |
>> >> >> Now, why is /usr special? It's because it contains executable code |
| 18 |
>> >> >> the system might require while launching. |
| 19 |
> |
| 20 |
>> >> > Now there are only two approaches that could solve that problem: |
| 21 |
> |
| 22 |
>> >> > 1. Avoid it entirely |
| 23 |
>> >> > 2. Deal with it using any of a variety of bootstrap techniques |
| 24 |
> |
| 25 |
>> >> > #1 is handled by policy, whereby any code the system might require |
| 26 |
>> >> > while launching is not in /usr. |
| 27 |
> |
| 28 |
>> >> > #2 already has a solution, it's called an init*. Other solutions |
| 29 |
>> >> > exist but none are as elegant as a throwaway temporary filesystem |
| 30 |
>> >> > in RAM. |
| 31 |
> |
| 32 |
>> >> What about just mounting /usr as soon as the system boots? |
| 33 |
> |
| 34 |
> |
| 35 |
>> > Please read the thread next time. The topic under discussion is |
| 36 |
>> > solutions to the problem of not being able to do exactly that. |
| 37 |
> |
| 38 |
>> Then I suppose you can surely explain in a nutshell why can't init |
| 39 |
>> scripts simply do that? |
| 40 |
> |
| 41 |
> Because certain people with influence have rearranged the filesystem so |
| 42 |
> that programs within /usr are absolutely necessary for booting; they are |
| 43 |
> needed _before_ init has a chance to mount /usr. So either /usr has to |
| 44 |
> be in the root partition, or crazy kludges need to be used to mount /usr |
| 45 |
> before the kernel runs init. |
| 46 |
|
| 47 |
I surely don't know the udev architecture well enough, but if this is |
| 48 |
all done by the udev daemon, can't we just "mount /usr" before the |
| 49 |
daemon is started? The only needed things should be mount (which is |
| 50 |
under /bin here) and /etc/fstab. |
| 51 |
|
| 52 |
Or is something outside udev needing stuff under /usr? |
| 53 |
|
| 54 |
-- |
| 55 |
Nuno Silva (aka njsg) |
| 56 |
http://njsg.sdf-eu.org/ |
Archives