#!/bin/sh
#
# Verify that given mountpoints have 'read-write' option.

output=$(mktemp --tmpdir $(basename "$0").XXXXXXXXXX)
critical_count=0
ok_count=0

trap "rm -f $output" EXIT

for mountpoint in $@; do
    # We verify no mointpoints have 'read-only' option instead of checking
    # for 'read-write' option, because there could be multiple device
    # mounted on a sigle path.  In that edge case only checking for the
    # presence of the 'read-write' option would yeild a flase positive.
    if findmnt -O ro --noheadings "$mountpoint" 1>/dev/null 2>&1; then
        echo "CRITICAL - $mountpoint" >> "$output"
        critical_count=$(( critical_count + 1))
    else
        echo "OK - $mountpoint" >> "$output"
        ok_count=$(( ok_count + 1))
    fi
done

total_count=$(( ok_count + critical_count ))

plural=''
test "$total_count" -gt 1 && plural='s'

if [ $ok_count -eq  $total_count ]; then
     printf "OK - %d/%d  mountpoint%s have 'read-write' option\n\n" \
         "$ok_count" "$total_count" "$plural"
     cat "$output"
     exit 0
else
    printf "CRITICAL - %d/%d mountpoint%s don't have 'read-write' option\n\n" \
        "$critical_count" "$total_count" "$plural"
    cat "$output"
    exit 2 
fi