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The mkfs.ext2 heuristics select the "small" ext2 usage type, which does not fit well with GiB-sized pen drives. For example, the block size is just 1024 bytes compared to 4096 for "default". Therefore, we enforce the default usage type as this fits our use case of dumping the image to USB sticks better.
77 lines
1.6 KiB
Bash
Executable File
77 lines
1.6 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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insmod legacycfg
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terminal_input console
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terminal_output console
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## just legacy load Genode
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legacy_configfile /boot/grub/menu.lst
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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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