Re: Proposition for Add-on

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 02.12.2013 01:11, Michel Benoit wrote:
> Hi!
> 
> I’ve d develop an internal command for grub to help the administrators
> of pool of dual boot machine.
> 
> The problem: We have class with near 100 computers in dual boot, under
> windows we have a maintenance period in the night to automatically
> install update. For that, in grub we put Windows has the default
> menu-entry.
> 
> The only time the computers are in linux, is when a student is using it.
> It's not a good time to install update. To install update, security
> patch, or other package, i was forced to pass computer by computer.
> 
No neede to write a module for this. Just do:
insmod datehook
if [ $HOUR -ge 4 -a $HOUR -lt 6 ]; then
  default=linux
else
  default=windows
fi
> 
> To get a period for the maintenance in linux, i wrote a simple module
> for grub that select the default menu-entry depending of the time of the
> day.
> 
> ex. :
> 
>    I set the period from 4am to 6am with the default boot to linux.
>    So i can put a script in the crontab at 4h05 to install the update.
>    (you have to put a shutdown -r command in Windows task scheduler at
> 4.00 am. And use a wake on lan for computer that are down)
> 
> Is it possible to integrate in in the distribution of grub, if you think
> it could help other user.
> 
> -------------------------------------------------------------------------------------------------------------------------------------------------------------
> 
> 
> The principal module grub-core/commands/select_by_time.c
> 
> The configuration file, two option
> 
>        the simple version /etc/grub.d/98_select_by_time
> 
>                    In 98_select_by_time, you select the period of time
> and the menuentry for that period, you can use many period of time. It
> use the 24 hours time format notation without colon.
> 
>        ex:
> 
>            # from 4 am to 6 am select item 3 as default
>            select_by_time 0400 0600 3
>            # and from 11h25 pm to midnight select item 5 as default
>            select_by_time 2325 2400 5
> 
>       or
> 
>        the more complete /etc/grub.d/99_select_by_time, that use the
> config file /boot/grub/select_by_time.cfg
>        With this version you don't have to know the position of the
> operating system in grub.cfg (menuitem).
> 
>        exemple of select_by_time.cfg
> 
>            select_default Windows
>            select_by_time 5:00 6:00 ubuntu           # maintenance period
>            select_by_time 13:00 15:00 ubuntu       # linux course
>            select_by_time 19:00 2308 "Linux 3.2.0-23-generic"    # specific
> 
> –--------------------------------------------------------------------------------------
> 
> 
> Right now, we are using select_by_time with 98_select_by_time, and we
> save a lot of days of work.
> If you think it could be helpful for other administrator, could you put
> it in a future grub distribution (the source code is very simple).
> The 99_select_by_time is optional, it's just more easy to use.
> 
> Thank's
> 
> ------------------------------------------------------
> Michel Benoit (morph1853)
> Technicien Systèmes Ordinés
> Dep. Informatique
> Université de Sherbooke
> address@hidden
> 
> 
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>

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