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#!/bin/sh
reboot_pi () {
umount /boot
mount / -o remount,ro
sync
if [ "$NOOBS" = "1" ]; then
if [ "$NEW_KERNEL" = "1" ]; then
reboot -f "$BOOT_PART_NUM"
else
echo "$BOOT_PART_NUM" > "/sys/module/${BCM_MODULE}/parameters/reboot_part"
fi
fi
echo b > /proc/sysrq-trigger
sleep 5
exit 0
}
check_commands () {
if ! command -v whiptail > /dev/null; then
echo "whiptail not found"
sleep 5
return 1
fi
for COMMAND in grep cut sed parted fdisk findmnt partprobe; do
if ! command -v $COMMAND > /dev/null; then
FAIL_REASON="$COMMAND not found"
return 1
fi
done
return 0
}
check_noobs () {
if [ "$BOOT_PART_NUM" = "1" ]; then
NOOBS=0
else
NOOBS=1
fi
}
get_variables () {
ROOT_PART_DEV=$(findmnt / -o source -n)
ROOT_PART_NAME=$(echo "$ROOT_PART_DEV" | cut -d "/" -f 3)
ROOT_DEV_NAME=$(echo /sys/block/*/"${ROOT_PART_NAME}" | cut -d "/" -f 4)
ROOT_DEV="/dev/${ROOT_DEV_NAME}"
ROOT_PART_NUM=$(cat "/sys/block/${ROOT_DEV_NAME}/${ROOT_PART_NAME}/partition")
BOOT_PART_DEV=$(findmnt /boot -o source -n)
BOOT_PART_NAME=$(echo "$BOOT_PART_DEV" | cut -d "/" -f 3)
BOOT_DEV_NAME=$(echo /sys/block/*/"${BOOT_PART_NAME}" | cut -d "/" -f 4)
BOOT_PART_NUM=$(cat "/sys/block/${BOOT_DEV_NAME}/${BOOT_PART_NAME}/partition")
OLD_DISKID=$(fdisk -l "$ROOT_DEV" | sed -n 's/Disk identifier: 0x\([^ ]*\)/\1/p')
check_noobs
ROOT_DEV_SIZE=$(cat "/sys/block/${ROOT_DEV_NAME}/size")
TARGET_END=$((ROOT_DEV_SIZE - 1))
PARTITION_TABLE=$(parted -m "$ROOT_DEV" unit s print | tr -d 's')
LAST_PART_NUM=$(echo "$PARTITION_TABLE" | tail -n 1 | cut -d ":" -f 1)
ROOT_PART_LINE=$(echo "$PARTITION_TABLE" | grep -e "^${ROOT_PART_NUM}:")
ROOT_PART_START=$(echo "$ROOT_PART_LINE" | cut -d ":" -f 2)
ROOT_PART_END=$(echo "$ROOT_PART_LINE" | cut -d ":" -f 3)
if [ "$NOOBS" = "1" ]; then
EXT_PART_LINE=$(echo "$PARTITION_TABLE" | grep ":::;" | head -n 1)
EXT_PART_NUM=$(echo "$EXT_PART_LINE" | cut -d ":" -f 1)
EXT_PART_START=$(echo "$EXT_PART_LINE" | cut -d ":" -f 2)
EXT_PART_END=$(echo "$EXT_PART_LINE" | cut -d ":" -f 3)
fi
}
fix_partuuid() {
DISKID="$(fdisk -l "$ROOT_DEV" | sed -n 's/Disk identifier: 0x\([^ ]*\)/\1/p')"
sed -i "s/${OLD_DISKID}/${DISKID}/g" /etc/fstab
sed -i "s/${OLD_DISKID}/${DISKID}/" /boot/cmdline.txt
}
check_variables () {
if [ "$NOOBS" = "1" ]; then
if [ "$EXT_PART_NUM" -gt 4 ] || \
[ "$EXT_PART_START" -gt "$ROOT_PART_START" ] || \
[ "$EXT_PART_END" -lt "$ROOT_PART_END" ]; then
FAIL_REASON="Unsupported extended partition"
return 1
fi
fi
if [ "$BOOT_DEV_NAME" != "$ROOT_DEV_NAME" ]; then
FAIL_REASON="Boot and root partitions are on different devices"
return 1
fi
if [ "$ROOT_PART_NUM" -ne "$LAST_PART_NUM" ]; then
FAIL_REASON="Root partition should be last partition"
return 1
fi
if [ "$ROOT_PART_END" -gt "$TARGET_END" ]; then
FAIL_REASON="Root partition runs past the end of device"
return 1
fi
if [ ! -b "$ROOT_DEV" ] || [ ! -b "$ROOT_PART_DEV" ] || [ ! -b "$BOOT_PART_DEV" ] ; then
FAIL_REASON="Could not determine partitions"
return 1
fi
}
check_kernel () {
local MAJOR=$(uname -r | cut -f1 -d.)
local MINOR=$(uname -r | cut -f2 -d.)
if [ "$MAJOR" -eq "4" ] && [ "$MINOR" -lt "9" ]; then
return 0
fi
if [ "$MAJOR" -lt "4" ]; then
return 0
fi
NEW_KERNEL=1
}
main () {
get_variables
if ! check_variables; then
return 1
fi
check_kernel
if [ "$NOOBS" = "1" ] && [ "$NEW_KERNEL" != "1" ]; then
BCM_MODULE=$(grep -e "^Hardware" /proc/cpuinfo | cut -d ":" -f 2 | tr -d " " | tr '[:upper:]' '[:lower:]')
if ! modprobe "$BCM_MODULE"; then
FAIL_REASON="Couldn't load BCM module $BCM_MODULE"
return 1
fi
fi
if [ "$ROOT_PART_END" -eq "$TARGET_END" ]; then
reboot_pi
fi
if [ "$NOOBS" = "1" ]; then
if ! parted -m "$ROOT_DEV" u s resizepart "$EXT_PART_NUM" yes "$TARGET_END"; then
FAIL_REASON="Extended partition resize failed"
return 1
fi
fi
if ! parted -m "$ROOT_DEV" u s resizepart "$ROOT_PART_NUM" "$TARGET_END"; then
FAIL_REASON="Root partition resize failed"
return 1
fi
partprobe "$ROOT_DEV"
fix_partuuid
return 0
}
mount -t proc proc /proc
mount -t sysfs sys /sys
mount -t tmpfs tmp /run
mkdir -p /run/systemd
mount /boot
mount / -o remount,rw
sed -i 's| init=/usr/lib/raspi-config/init_resize.sh||' /boot/cmdline.txt
if ! grep -q splash /boot/cmdline.txt; then
sed -i "s/ quiet//g" /boot/cmdline.txt
fi
sync
echo 1 > /proc/sys/kernel/sysrq
if ! check_commands; then
reboot_pi
fi
if main; then
whiptail --infobox "Resized root filesystem. Rebooting in 5 seconds..." 20 60
sleep 5
else
sleep 5
whiptail --msgbox "Could not expand filesystem, please try raspi-config or rc_gui.\n${FAIL_REASON}" 20 60
fi
reboot_pi