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72 lines
3.9 KiB
Bash
72 lines
3.9 KiB
Bash
#!/bin/bash -xe
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# Expand rootfs partition to its maximum size, if /.expand-rootfs exists.
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# Used by /etc/systemd/system/iiab-expand-rootfs.service on IIAB boot.
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# Should work with all Linux OS's boot disks -- regardless whether Raspberry Pi
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# microSD cards, external USB drives, internal spinning disks or SSD's, etc.
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# Verifies that rootfs is the last partition.
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# RELATED:
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# 1. https://github.com/iiab/iiab-factory/blob/master/box/rpi/min-sd
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# 2. https://github.com/iiab/iiab-factory/blob/master/box/rpi/cp-sd
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# 3. https://github.com/iiab/iiab-factory/blob/master/box/rpi/xz-json-sd
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# OR https://github.com/iiab/iiab-factory/blob/master/box/rpi/exp-sd
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if [ -f /.expand-rootfs ] || [ -f /.resize-rootfs ]; then
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echo "$0: Expanding rootfs partition"
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if [ -x /usr/bin/raspi-config ]; then # Raspberry Pi OS -- WARNING: their fdisk-centric approach of course FAILS with "Hybrid MBR" or GPT partition tables, as required by any drive > 2TB :/
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# 2022-02-17: Uses do_expand_rootfs() from:
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# https://github.com/RPi-Distro/raspi-config/blob/master/raspi-config
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# 2023-10-05: Official new RPi instructions:
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# sudo raspi-config nonint do_expand_rootfs
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# https://www.raspberrypi.com/documentation/computers/configuration.html#expand-filesystem-nonint
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raspi-config --expand-rootfs # REQUIRES A REBOOT
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rm -f /.expand-rootfs /.resize-rootfs
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reboot # In future, we might warn interactive users that a reboot is coming?
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else # REQUIRES NO REBOOT; BEWARE iiab-expand-rootfs.service RACE CONDITION WITH fsck (PR #2522 & #3325)
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# 2022-03-15: Borrows from above raspi-config URL's do_expand_rootfs()
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ROOT_PART="$(findmnt / -o SOURCE -n)" # e.g. /dev/sda2 or /dev/mmcblk0p2
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ROOT_DEV="/dev/$(lsblk -no pkname "$ROOT_PART")" # e.g. /dev/sda or /dev/mmcblk0
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ROOT_PART_NUM="$(echo "$ROOT_PART" | grep -o "[[:digit:]]*$")" # e.g. 2
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# SLOW (~10 seconds) but it works!
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LAST_PART_NUM=$(parted "$ROOT_DEV" -ms unit s p | tail -n 1 | cut -f 1 -d:)
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if [ $ROOT_PART_NUM -ne $LAST_PART_NUM ]; then
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echo "ERROR: $ROOT_PART partition ($ROOT_PART_NUM) is not the last partition ($LAST_PART_NUM). Don't know how to expand."
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exit 1
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fi
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# Expand partition
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growpart $ROOT_DEV $ROOT_PART_NUM || true # raspi-config instead uses fdisk (assuming MBR). They really should transition to gdisk, as required by any drive > 2TB. WARNING: growpart RC 2 is more severe than RC 1, and should possibly be handled separately in future?
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rc=$? # Make Return Code visible, for 'bash -x'
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resize2fs $ROOT_PART
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rc=$? # Make RC visible (as above)
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# 2022-03-15: Legacy code below worked with Raspberry Pi microSD cards
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# but *not* with USB boot drives, internal spinning disks/SSD's, etc.
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# # ASSUMES SD CARD STYLE PARTITION NAME LIKE <device>p<partition number>
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# # e.g. /dev/mmcblk0p2 mounts at / (typical RasPiOS microSD)
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# # BUT /dev/sda2 mounts at /media/usb1 (RasPiOS USB boot disk...
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# # ...WON'T WORK BELOW; recap @ PR #3121)
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# # Calculate root partition
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# root_part=`lsblk -aP -o NAME,MOUNTPOINT | grep 'MOUNTPOINT="/"' | awk -F\" '{ print $2 }'` # e.g. mmcblk0p2
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# root_dev=${root_part:0:-2} # e.g. mmcblk0
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# # bash substring expansion: "negative offset [below, but not above]
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# # must be separated from the colon by at least one space to avoid
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# # being confused with the ‘:-’ expansion"
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# # https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html
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# root_part_no=${root_part: -1} # e.g. 2
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# # Resize partition
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# growpart /dev/$root_dev $root_part_no
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# resize2fs /dev/$root_part
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rm -f /.expand-rootfs /.resize-rootfs
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fi
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fi
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