[Buildroot] [PATCH] package/skeleton: add a startup script to wait for slow network interfaces

[Maxime Hadjinlian]

On Sat, Oct 3, 2015 at 5:47 PM, Thomas Petazzoni <
thomas.petazzoni at free-electrons.com> wrote:

> Hello,
>
> On Sat,  3 Oct 2015 14:31:45 +0100, Yann E. MORIN wrote:
>
> > +    printf "Waiting for interface %s to appear" "${IF}"
> > +    wait=${WAIT_DELAY}
> > +    while [ ${wait} -gt 0 ]; do
> > +        if [ -e "/sys/class/net/${IF}" ]; then
> > +            printf " yes\n"
> > +            return 0
> > +        fi
> > +        sleep 1
> > +        printf "."
> > +        : $((wait--))
> > +    done
>
> One thing that I really like in Buildroot is that by default, it
> generates you a system that boots really fast. People often don't have
> to do anything special with Buildroot to make it boot fast. So having a
> shell script that is installed by default and does a "sleep 1" in a
> loop is not very nice :-/
>
> Though I agree that it will only slow the boot on systems where the
> network interfaces are not available immediately at boot time.
>
I have that trouble too but instead of doing a sleep 1, I "hammer" the
system with sleep 0.1 or usleep 25 if it's available (even usleep 1 can
work, since it's not RT, it takes around 10ms).
This way it's almost transparent and add the necessary requirements before
going on with the boot.

>
> Thomas
> --
> Thomas Petazzoni, CTO, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com
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>
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