SGDDevCamporells
How to build grub2
svn co http://svn.savannah.gnu.org/svn/grub/trunk/grub2
Change directory to grub2
cd grub2
sudo apt-get install ruby bison autotools-dev automake liblzo2-2 liblzo2-dev libc6-dev
sudo apt-get install build-essential
./autogen.sh ./configure && make
Install grub2 on your system
This command does not modify your MBR so you do not have to be afraid to run it.
sudo make install
Create a basic grub2 cdrom
grub-mkrescue ../../grub2_cdrom_thanks_to_grub_mkrescue.iso
Boot Linux Grub2 Manual commands
set sgd_vmlinuz_path=/vmlinuz set sgd_initrd_path=/initrd.img search --set=sgd_linux_kernel -f $sgd_vmlinuz_path search --set=sgd_linux_initrd -f $sgd_initrd_path probe -u ($sgd_linux_kernel) --set=sgd_root_uuid set root=$sgd_linux_kernel linux ($sgd_linux_kernel)$sgd_vmlinuz_path root=UUID=$sgd_root_uuid initrd ($sgd_linux_initrd)$sgd_initrd_path boot
Create an advanced grub2 cdrom
Create raiz_disco_grub2_sgd_test1 folder
mkdir raiz_disco_grub2_sgd_test1 folder
Create a boot/grub/grub.cfg file inside raiz_disco_grub2_sgd_test1folder with the following content:
# Timeout for menu
set timeout=10
# Set default boot entry as Entry 0
set default=0
# Entry 0 - Load first Kernel and Initrd (initrd support)
menuentry "First Kernel and Initrd" {
set sgd_vmlinuz_path=/vmlinuz
set sgd_initrd_path=/initrd.img
search --set=sgd_linux_kernel -f $sgd_vmlinuz_path
search --set=sgd_linux_initrd -f $sgd_initrd_path
probe -u ($sgd_linux_kernel) --set=sgd_root_uuid
set root=$sgd_linux_kernel
linux ($sgd_linux_kernel)$sgd_vmlinuz_path root=UUID=$sgd_root_uuid
initrd ($sgd_linux_initrd)$sgd_initrd_path
boot
}
Finally you create:
grub-mkrescue --overlay=./raiz_disco_grub2_sgd_test1/ ./grub2_cdrom_thanks_to_grub_mkrescue.iso
How to modify grub-rescue-pc package
grub-rescue-pc just generates a cdrom and a floppy image. It is more or less what Super Grub2 Disk it is. So here we will learn how to modify grub-rescue-pc package from debian and upstream source code. After building the package we will set up a local repository and install it.
Debian Grub2 Source Code grab
svn export svn://svn.savannah.gnu.org/grub/trunk/grub2 grub2 cd grub2 svn export svn://svn.debian.org/svn/pkg-grub/grub2/trunk/debian svn cat svn://svn.debian.org/pkg-grub/grub/trunk/debian/update-grub > debian/legacy/update-grub svn export svn://svn.sv.nongnu.org/grub-extras/trunk debian/grub-extras
Debian Grub2 Super Grub Disk patch
SGD Disk patch for Grub2 can be found here at berlios download: https://developer.berlios.de/project/filelist.php?group_id=10921. (Check SG2D Source Code section)
In order to apply it you need to be at Debian source code package root folder and run:
patch -p1 < ../path/to/th /grub2_package_super_grub_disk.patch
This patch has every command that grub2 needs to be a super disk.
Debian Grub2 Build
You change directory to the Debian package source code root folder and you just run:
debuild -b
This command will create for you in ../ (upper folder) some files among binary packages, source packages, a .changes file and .dsc file (maybe it will not create this last one).
(Depending on your setup you might receive errors because of non-installed packages. Just install them as they are requested.)
Debian Grub2 Repository setup
Although you can install the grub-rescue-pc by hand thanks to
dpkg -i /path/to/package
I recommend you to setup a local repository so that you can install the packages with the Debian package system advantages.
So in order to setup a repository we are going to need the reprepro package.
apt-get install reprepro
We create a new folder.
mkdir /home/user/supergrub2_repository/
We enter it.
cd /home/user/supergrub2_repository/
We create conf folder
mkdir conf
We edit distributions file instead conf folder
gedit conf/distributions
This is the recommended distributions content (Althought I am not an expert so this might be improved):
Origin: Adrian Gibanel Lopez Label: sid_label Suite: unstable Codename: sid Architectures: i386 source Components: main Description: Svn updated grub2 packages and Super Grub2 Disk.
Debian Grub2 Repository import
We change directory to repository root
cd /home/user/supergrub2_repository/
We import the new package to the repository.
reprepro -Vb . include sid /home/adrian/gnu/sgd/sgd_grub2/grub2_package_updated_to_svn/nuevo/sgd_improved/grub2_1.96+20090725-1.1_i386.changes
(You have to use your own .changes file at Debian package source code root folder parent folder).
sources.list update
You should edit /etc/apt/sources.list file as root.
su <Enter your password> gedit /etc/apt/sources.list
Add this line to the top of the file:
deb file:/home/user/supergrub2_repository/ sid main
Save the file and exit from gedit.
Package System update
Run as root:
apt-get update
(If you have done everything ok no error should be reported).
grub-rescue-pc installation
Now you just have to run as root:
apt-get install grub-rescue-pc
Final grub-rescue-pc iso test
Now you can find the resultant files at: /usr/lib/grub-rescue/
grub-rescue-cdrom.iso grub-rescue-floppy.img
So that you can maybe try to boot the cdrom image in qemu:
qemu -boot d -cdrom /usr/lib/grub-rescue/grub-rescue-cdrom.iso -hda /path/to/harddisk.img
