#!/bin/sh
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# Copyright (c) Fathi Boudra <fathi.boudra@linaro.org>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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# we must be root
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[ $(whoami) = "root" ] || { echo "E: You must be root" && exit 1; }
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# we must have few tools
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SGDISK=$(which sgdisk) || { echo "E: You must have sgdisk" && exit 1; }
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PARTED=$(which parted) || { echo "E: You must have parted" && exit 1; }
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PARTPROBE=$(which partprobe) || { echo "E: You must have partprobe" && exit 1; }
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RESIZE2FS=$(which resize2fs) || { echo "E: You must have resize2fs" && exit 1; }
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# find root device
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ROOT_DEVICE=$(findmnt --noheadings --output=SOURCE / | cut -d'[' -f1)
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# prune root device (for example UUID)
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ROOT_DEVICE=$(realpath ${ROOT_DEVICE})
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# get the partition number and type
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PART_ENTRY_NUMBER=$(udevadm info --query=property --name=${ROOT_DEVICE} | grep '^ID_PART_ENTRY_NUMBER=' | cut -d'=' -f2)
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# in case the root device is not on a partitioned media
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if [ "x$PART_ENTRY_NUMBER" = "x" ]; then
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${RESIZE2FS} "${ROOT_DEVICE}"
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exit 0
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fi
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PART_TABLE_TYPE=$(udevadm info --query=property --name=${ROOT_DEVICE} | grep '^ID_PART_TABLE_TYPE=' | cut -d'=' -f2)
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# find the block device
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DEVICE=$(udevadm info --query=path --name=${ROOT_DEVICE} | awk -F'/' '{print $(NF-1)}')
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DEVICE="/dev/${DEVICE}"
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if [ "$PART_TABLE_TYPE" = "gpt" ]; then
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${SGDISK} -e ${DEVICE}
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${PARTPROBE}
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fi
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${PARTED} ${DEVICE} resizepart ${PART_ENTRY_NUMBER} 100%
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${PARTPROBE}
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${RESIZE2FS} "${ROOT_DEVICE}"
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