63 lines
2.3 KiB
Bash
63 lines
2.3 KiB
Bash
set -ex
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DISK_NAME=${PWD}/ubuntu-sgdisk.img
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#DISK_NAME=/dev/sdb
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# cleanup
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touch $DISK_NAME
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rm $DISK_NAME
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# Partition sizes in MiB
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EFI_SIZE=4
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SWAP_SIZE=8
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BOOT_SIZE=16
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ROOT_SIZE=128
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# Define max sizes and offsets
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EFI_START=2048 # was 64 but report it is not aligned, 2048, which is 1MB alignment.
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EFI_OFFSET=$((${EFI_SIZE}*1024*1024/512)) # 8192 4 MiB 8192
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SWAP_OFFSET=$((${SWAP_SIZE}*1024*1024/512)) # 16382 8 MiB 16384
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BOOT_OFFSET=$((${BOOT_SIZE}*1024*1024/512)) # 32768 16 MiB 32768
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ROOT_OFFSET=$((${ROOT_SIZE}*1024*1024/512)) # 524288 128 MiB 262144
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MIN_SIZE=$((500*1000*1000/512)) # 976562 500 MiB
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SIZE_STEP=$((100*1000*1000/512)) # 195312 100 MiB
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MAX_SIZE=$((8*1000*1000*1000/512)) # 15625000 8 GiB
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# Create
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rm -f "$DISK_NAME"
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truncate --size "$((MAX_SIZE*512))" "$DISK_NAME"
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bootfs="fat32"
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rootfs="ext2"
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alignment_type="optimal" # none, cylinder, minimal, optimal
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# Create partitions
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echo Updating GPT...
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TARGET=${DISK_NAME}
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/sbin/sgdisk --zap-all ${TARGET}
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## Partition 1 - Create partition using start and end values for partitioning the `EFI` partition.
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#STARTSECTOR=`/sbin/sgdisk --first-aligned-in-largest ${TARGET}|sed -sn 2p`
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STARTSECTOR=${EFI_START}
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/sbin/sgdisk --print --set-alignment=${STARTSECTOR} --mbrtogpt --new=1:${STARTSECTOR}:+${EFI_SIZE}MB ${TARGET}
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/sbin/sgdisk --print --change-name=1:"EFI System Partition" --typecode=1:EF00 ${TARGET}
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## Partition 2 - Create partition using start and end values for partitioning the `swap` partition.
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#ENDSECTOR=`/sbin/sgdisk --end-of-largest ${TARGET}|sed -sn 2p`
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STARTSECTOR=`/sbin/sgdisk --first-in-largest ${TARGET}|sed -sn 2p`
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/sbin/sgdisk --print --new=2:${STARTSECTOR}:+${SWAP_SIZE}MB ${TARGET}
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/sbin/sgdisk --print --change-name=2:"Linux swap" --typecode=2:8200 ${TARGET}
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## Partition 3 - upto 2GB partition for boot
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#ENDSECTOR=`/sbin/sgdisk --end-of-largest ${TARGET}|sed -sn 2p`
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STARTSECTOR=`/sbin/sgdisk --first-in-largest ${TARGET}|sed -sn 2p`
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/sbin/sgdisk --print --new=3:${STARTSECTOR}:+${BOOT_SIZE}MB ${TARGET}
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/sbin/sgdisk --print --change-name=3:boot --typecode=3:BE00 ${TARGET}
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## Partition 4 - the main partition for root
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/sbin/sgdisk --print --largest-new=4 ${TARGET}
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/sbin/sgdisk --print --change-name=4:root --typecode=4:BF00 ${TARGET}
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/sbin/gdisk -print ${TARGET}
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