On most systems, GRUB shows a message like
GRUB loading.
Welcome to GRUB!
at boot, just before loading the boot menu. Current versions of GRUB do not provide any mechanism to disable this message without patching and recompiling GRUB itself.
This process is cumbersone, as it requires expertise and forces you to recompile / repatch every time you update grub.
grub-shusher contains two tiny .c files that instead of patching the
grub source code, they patch the grub binaries or installed master boot
record to disable those messages.
The software is generally safe: it looks for a specific set of patterns, and if not all are found, it stops processing. It has been tested on a few machines, and works as expected.
However, I only have access to a handful of machines, and the code will modify your master boot record.
USE IT AT YOUR OWN RISK - YOU ARE RESPONSIBLE FOR BACKING UP AND RESTORING YOUR DATA
At this point, it has been tested on systems with:
- EFI
- GPT
- Standard partition table
If you have success / failure stories to tell, please email me directly (ccontavalli AT gmail.com) or open issues on github (https://github.com/ccontavalli/grub-shusher/issues).
REPLACE /dev/sda with your GRUB PARTITION, used with grub-setup or grub-install
# ./setup-debian.sh /dev/sda
... and go read configuring grub.
If you want to setup grub-shusher automatically after each upgrade, you
can edit /etc/apt/apt.conf, and add a section like:
DPkg
{
Post-Invoke {"/opt/projects/grub-shusher/setup-debian.sh /dev/sda >/dev/null 2>/dev/null || true;";};
}
where /opt/projects/grub-shuser is the directory where you downloaded grub-shusher, and /dev/sda is
the partition or disk where grub is installed.
$ make
$ sudo -s
# ./grub-kernel /boot/grub/kernel.img
# ./grub-kernel /usr/lib/grub/i386-pc/kernel.img
# grub-install /dev/sda
# ./mbr /dev/sda
... and done. Note that the order is important:
makewill compile the code, you need to have GCC installed.grub-kernel ...will remove the 'Welcome to GRUB!' message from thekernel.imgfile.grub-install /dev/sdawill create a new compressed image (by merging several other files, including kernel.img) and install it on your disk.mbr /dev/sdawill remove a few other messages from the installed mbr.
... and go read configuring grub.
$ make
$ sudo -s
# ./grub-kernel /boot/efi/EFI/***/grubx64.efi
... and done. Important:
-
make always sure that you have made a backup of
grubx64.efi -
replace
***with the distribution name, for example/boot/efi/EFI/manjaro/grubx64.efi.
... and go read configuring grub.
$ make
$ sudo -s
# ./mbr -g /dev/sda
# ./mbr -g /dev/bios-boot-partition
Note:
-
You must provide the -g flag, this is important for GPT partitions.
-
You must run
mbrtwice:- With the partition GRUB was told to use (/dev/sda, in this document).
- With the GPT partition, the one marked with the EF02 type. You can find this partition by running something like:
# parted /dev/sda print
To make GRUB entirely quiet, my /etc/defaults/grub has:
GRUB_DEFAULT=0
GRUB_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT=5
GRUB_HIDDEN_TIMEOUT_QUIET=true
Note that once you have those lines, you need to run update-grub, and on next reboot,
you will have to press 'ESC' or keep 'shift' pressed to get into the grub menu. I suggest
you try this before you shush grub.
If something goes wrong, you can:
# apt-get install --reinstall grub2
# grub-install /dev/sda
to clean up after yourself.
You can read more about grub-shusher on this blog post.
Once you change /etc/defaults/grub and run update-grub, grub will no longer show up at
boot. To get into the menu, you can try two things:
- Keep
shiftpressed during boot. This is the documented mechanism, did not work for me. - Press
ESCat boot. This is a bit tricky, as if you press it too early, most BIOSes will bring you in the BIOS menu. If you press it too late, well, the operating system will have booted already. The rule of thumb is to press it at the time the GRUB menu would have showed up, had it been enabled. If you use the settings above, you have 5 seconds of window to press the button. On my laptopt, this is right after the screen is cleared.
Thanks go to:
- Carlo Contavalli, www.github.com/ccontavalli - main author.
- cybnetsurfe3011, www.github.com/cybnetsurfe3011 - GPT support.
- vincent-t, www.github.com/vincent-t - EFI testing and documentation.
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