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Re: Skipping fsck during boot with systemd?

On 12/10/2014 at 06:10 AM, Andrei POPESCU wrote:

> On Mi, 10 dec 14, 07:32:07, Renaud OLGIATI wrote:
>> In my case no, more likely during shut-down, since the only time I
>> shut down my box is when there is a power cut, and I have to shut
>> it down quickly, before the UPS gives up. So I certainly do not
>> want an unwanted automatic fsck at that time.
> That would be easy to implement, assuming you computer "knows" it's 
> running on batteries.

On batteries is easy enough, for a laptop-style system.

But for a more ordinary desktop (or server), running on a UPS, how is it
supposed to know that it is on battery-based power?

It's plugged in through an ordinary power cable, with no other
connection to the power source. What indication is it supposed to have
that the power source at the other end of that cable is any different
from a standard wall outlet?

I imagine that this might be one of the things the "USB cable from the
UPS" is intended to address, but I don't think my own UPS (for example)
includes any USB port, despite being a fairly high-end unit. (And off
the top of my head I don't know of any software to handle that in

For that matter, what if the wall outlet is connected to a "room" UPS?
There won't be a data connection to the UPS there.

Or if the entire thing is backed by a building emergency generator?

Both of those latter situations are similarly time-limited, and even if
there are heuristic solutions for the others, the last at least will
generally not be something the computer can detect and identify.

   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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