Function get_can_expand returns 0 even if there is no space to expand

[majes-github]

In order to automate installations of raspberry pis I'm writing an ansible playbook, which should also expand the rootfs if possible.

My idea was to use raspi-config nonint get_can_expand to check if the rootfs can be expanded (as the name indicates), but looking at the code it just checks if the rootfs partition is the second on drive and it is the last one. This would trigger the playbook to call raspi-config nonint do_expand_rootfs every time.

Actually it should also check if there is space left on the drive, e.g.

UNUSED_SECTORS=$(parted "$ROOT_DEV" -ms unit s p | awk -F: 'NR==2{ print $2, "-" } NR==4 { print $3 }' | tr -d 's' | xargs expr)
if [ $UNUSED_SECTORS -le 1 ]; then
  echo 2
  exit
fi

[majes-github]

For the sake of completeness - this is the output from parted on my DUT:

$ sudo parted /dev/mmcblk0 -ms unit s p
BYT;
/dev/mmcblk0:61046784s:sd/mmc:512:512:msdos:SD SD32G:;
1:8192s:532479s:524288s:fat32::lba;
2:532480s:61046783s:60514304s:ext4::;