#!/bin/bash
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set -e
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set -u
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# find the root partition information
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ROOT_PART="$(mount | sed -n 's|^/dev/\(.*\) on / .*|\1|p')"
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ROOT_DEV="/dev/$(lsblk -no pkname /dev/${ROOT_PART})"
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PART_NUM="$(echo $ROOT_PART | grep -o "[[:digit:]]*$")"
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# Get the starting offset of the root partition
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PART_START=$(fdisk -l $ROOT_DEV | grep $ROOT_PART | awk '{print $2}')
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[ "$PART_START" ] || return 1 ;
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fdisk "$ROOT_DEV" > /dev/null 2>&1 <<EOF
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p
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d
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$PART_NUM
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n
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p
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$PART_NUM
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$PART_START
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p
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w
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EOF
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resize2fs /dev/$ROOT_PART > /dev/null 2>&1
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echo "Expand rootfs size successfully, it will be enlarged upon the next reboot."
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