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Further clarify 1-prep/templates/iiab-rpi-max-rootfs.sh

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A Holt 2022-02-18 13:46:46 -05:00 • committed by GitHub
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roles/1-prep/templates/iiab-rpi-max-rootfs.sh
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@ -13,20 +13,24 @@ if [ -f /.resize-rootfs ]; then
if [ -x /usr/bin/raspi-config ]; then
# 2022-02-17: Works in many more situations, e.g. with USB disks (not
# just microSD cards). IF ONLY THIS ALSO WORKED ON Ubuntu/Mint/etc !
# Uses do_expand_rootfs() from:
# https://github.com/RPi-Distro/raspi-config/blob/master/raspi-config
raspi-config --expand-rootfs
else
# 2022-02-17 PR #3121: This 2-line explanation appears stale...
# Assumes SD card style partition name like <device>p<partition number>
# Only works on F22 + where resizepart command exists
# ASSUMES SD CARD STYLE PARTITION NAME LIKE <device>p<partition number>
# e.g. /dev/mmcblk0p2 mounts at / (typical RasPiOS microSD)
# BUT /dev/sda2 mounts at /media/usb1 (typical RasPiOS USB boot
# disk WON'T WORK BELOW!)
# Calculate root partition
root_part=`lsblk -aP -o NAME,MOUNTPOINT | grep 'MOUNTPOINT="/"' | awk -F\" '{ print $2 }'`
root_dev=${root_part:0:-2}
root_part=`lsblk -aP -o NAME,MOUNTPOINT | grep 'MOUNTPOINT="/"' | awk -F\" '{ print $2 }'` # e.g. mmcblk0p2
root_dev=${root_part:0:-2} # e.g. mmcblk0
# bash substring expansion: "negative offset [below, but not above]
# must be separated from the colon by at least one space to avoid
# being confused with the ‘:-’ expansion"
# https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html
root_part_no=${root_part: -1}
root_part_no=${root_part: -1} # e.g. 2
# Resize partition
growpart /dev/$root_dev $root_part_no