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75 lines
1.5 KiB
Bash
Executable File
75 lines
1.5 KiB
Bash
Executable File
#!/bin/bash
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#
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# \brief Create hard-disk image bootable via GRUB2
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# \author Christian Helmuth
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# \date 2014-07-11
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#
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# We generate a head-image file only. This image contains MBR, label
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# (partition table), and one primary partition where GRUB2 is installed. The
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# image size fits only the GRUB2 binaries and must be extended later to include
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# further binaries and data.
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#
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# Some parts of this script must be executed with superuser privileges and
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# utilize 'sudo' for this purpose.
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set -e
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#set -x
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#
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# config
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#
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head_size="8MiB"
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head_img="grub2-head.img"
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# generate image file
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if [ -f $head_img ]; then
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echo "$head_img exists. Exiting..."
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exit 1
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fi
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fallocate -l $head_size $head_img
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# prepare label and partition table
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parted="parted -s $head_img -- unit MiB"
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$parted "mklabel msdos"
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$parted "mkpart primary ext2 1MiB -1s"
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# loop image as disk (loop0) and partition 1 (loop1)
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sudo losetup /dev/loop0 $head_img
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sudo losetup /dev/loop1 $head_img -o 1MiB
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# initialize ext2 on partition
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sudo mkfs.ext2 /dev/loop1 -L GENODE -q -T default
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# install GRUB2
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mnt=$(mktemp -d)
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sudo mount /dev/loop1 $mnt
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sudo grub-install --root-directory=$mnt --no-floppy \
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--modules="biosdisk part_msdos ext2" /dev/loop0
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# generate GRUB2 configuration
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cfg=$(mktemp)
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cat > $cfg <<EOF
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set prefix=(hd0,msdos1)/boot/grub
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insmod normal
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terminal_input console
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terminal_output console
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configfile /boot/grub/grub.cfg
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EOF
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sudo cp $cfg $mnt/boot/grub/grub.cfg
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# cleanup
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rm $cfg
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sudo umount $mnt
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rm -r $mnt
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sudo losetup -d /dev/loop1
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sudo losetup -d /dev/loop0
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