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59 lines
2.7 KiB
Bash
59 lines
2.7 KiB
Bash
#!/bin/bash -x
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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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if [ -f /.expand-rootfs ] || [ -f /.resize-rootfs ]; then
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echo "$0: Expanding rootfs partition"
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if [ -x /usr/bin/raspi-config ]; then # Raspberry Pi OS
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# 2022-02-17: Uses do_expand_rootfs() from:
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# https://github.com/RPi-Distro/raspi-config/blob/master/raspi-config
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raspi-config --expand-rootfs
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else # Other Linux OS's
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# 2022-03-15: Borrows from above raspi-config URL's do_expand_rootfs()
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ROOT_PART="$(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 # raspi-config instead uses fdisk
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resize2fs $ROOT_PART
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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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fi
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rm -f /.expand-rootfs /.resize-rootfs
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fi
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