df

#!/bin/bash

max_space=90
max_inodes=85
skip_fstypes=( fuse.sshfs squashfs )
skip_mps=( )
err=

df_bb= df_cmd=$(readlink -f $(command -pv df))
[[ "${df_cmd##*/}" = busybox ]] && df_bb=t df_cmd='df -hT' || \
	df_cmd='df -h --output=target,pcent,ipcent,fstype,used,size'

while read mp perc_space perc_inodes fstype used size tail; do
	[[ "$mp" = Mounted || "$mp" = Filesystem ]] && continue
	[[ -z "$df_bb" ]] || {
		mp=$tail used=$fstype fstype=$perc_space
		perc_space=$size size=$perc_inodes perc_inodes=0; }

	skip=
	for fstype_chk in "${skip_fstypes[@]}"
	do [[ "$fstype" = "$fstype_chk" ]] && { skip=t; break; }
	done
	for mp_chk in "${skip_mps[@]}"
	do eval "[[ \$mp =~ $skip_mps ]] && { skip=t; break; }"
	done
	[[ -n "$skip" ]] && continue

	perc_space=${perc_space%\%}
	perc_inodes=${perc_inodes%\%}

	warn=
	[[ -n "$max_space" && "$perc_space" != -
		&& "$perc_space" -gt "$max_space" ]] && warn=t
	[[ -n "$max_inodes" && "$perc_inodes" != -
		&& "$perc_inodes" -gt "$max_inodes" ]] && warn=t

	[[ -n "$warn" ]] && {
		err=t; echo >&2 "WARNING: mountpoint is over space/inodes threshold"\
			"($perc_space/$max_space:$perc_inodes/$max_inodes) - $mp ($fstype, $used/$size)"; }
done < <(LANG=C $df_cmd)

[[ -n "$err" ]] && exit 1 || exit 0