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 > michel.ben...@usherbrooke.ca > > > _______________________________________________ > Grub-devel mailing list > Grub-devel@gnu.org > https://lists.gnu.org/mailman/listinfo/grub-devel >
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