I have 3 commands I have to run manually to expand my USB filesystem. I am looking for help on automating this in a script that does not need user input at all. I understand you can expand the filesystem using command "raspi-config --expand-rootfs" but I need to combine all these commands into a script.
sudo bash
sed -E 's/mmcblk0p?/sda/' /usr/bin/raspi-config | bash
-- THEN manually expand filesystem --
Rather than adapting raspi-config to your needs, wouldn't it be easier to write your own script to expand the root FS?
parted /dev/sda resizepart 2 XXXX # resize /dev/sda2 to XXXX in MB
parted /dev/sda resizepart 2 100% # or just use all available space
resize2fs /dev/sda2 # resize filesystem
(obviously, you don't need both parted lines in an actual script, choose the one that fits your use case)
Take a look inside raspi-config or here if you need to find out the partition size dynamically.
There is no need to "find the full size of the filesystem" - by default fdisk will use all space (and will indeed suggest the size). The only precaution is the need to ensure the correct partition START is selected.
If you REALLY want to use parted you can use a command like
cat /sys/block/mmcblk0/size
to get the size (you would need to use the appropriate disk identifier).
See https://raspberrypi.stackexchange.com/a/49921/8697 - this is a generic Linux procedure that should work on any MBR disk
This CAN be scripted, but as the link points out "scripting fdisk is far from straightforward and you will probably never need to repeat".
The script I used to resize images - could be adapted, but be warned it takes so long to get it right you would be better to do it manually.
Alternatively you could adapt the script Raspbian uses:-
#!/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 "$ROOT_DEV"
fix_partuuid
return 0
}
mount -t proc proc /proc
mount -t sysfs sys /sys
mount -t tmpfs tmp /run
mkdir -p /run/systemd
mount /boot
mount / -o remount,rw
sed -i 's| init=/usr/lib/raspi-config/init_resize\.sh||' /boot/cmdline.txt
sed -i 's| sdhci\.debug_quirks2=4||' /boot/cmdline.txt
if ! grep -q splash /boot/cmdline.txt; then
sed -i "s/ quiet//g" /boot/cmdline.txt
fi
sync
echo 1 > /proc/sys/kernel/sysrq
if ! check_commands; then
reboot_pi
fi
if main; then
whiptail --infobox "Resized root filesystem. Rebooting in 5 seconds..." 20 60
sleep 5
else
sleep 5
whiptail --msgbox "Could not expand filesystem, please try raspi-config or rc_gui.\n${FAIL_REASON}" 20 60
fi
reboot_pi
