test-permissions.sh

#!/usr/bin/env bash

# tested with bash 4.3

cd_into() {
    (cd $1)
}

list_directory() {
    (ls $1 > /dev/null)
}

cd_and_list() {
    (cd $1 && ls > /dev/null)
}

rename_file() {
    act_on_file --rename $@
}

delete_file() {
    act_on_file --delete $@
}

append_to_file() {
    act_on_file --append $@
}

write_to_file() {
    act_on_file --write $@
}

read_file() {
    act_on_file --read $@
}

act_on_file() {
    local action=${1:2}
    local pre_or_post=${2:2}
    local current_dir=$3
    local perm=$4

    local filename="$current_dir/${perm}_${pre_or_post}_$action"
    case $action in
        rename) mv $filename "$filename.other";;
        append) echo something >> $filename;;
        write) echo something > $filename;;
        delete) rm $filename; return $? ;;
        read) cat $filename;;
        *) echo "Invalid Option"; exit 1;;
    esac
}

act_all() {
    execute_action rename_file $@
    execute_action delete_file $@
    execute_action append_to_file $@
    execute_action write_to_file $@
    execute_action read_file $@
}

execute_action() {
    local action=$1
    shift

    eval $action $@
    if (( $? )); then
        echo "$action $@ FAILURE"
    else
        echo "$action $@ SUCCESS"
    fi

}

setup_directory() {
    local pre_or_post=${1:2}
    local current_dir=$2
    local action
    local perm

    touch "$current_dir/can_create_file_${pre_or_post}"
    if (( $? )); then
        return 1
    fi
    for action in $ACTIONS; do 
        for perm in $PERMS; do
            local filename="$current_dir/${perm}_${pre_or_post}_$action"
            touch $filename && chmod $perm $filename
        done
    done
    return 0
}

setup() {
    local perm
    mkdir -p $ROOT_DIR

    for perm in $PERMS; do 
        current_dir="$ROOT_DIR/$perm"
        mkdir $current_dir
        setup_directory --pre $current_dir
        chmod $perm $current_dir
        setup_directory --post $current_dir
        [[ $? == 0 ]] && CREATION_SUCCESS[$perm]=1
    done
}

LOGFILE=${1:-`pwd`/test-permissions.log}
ACTIONS="read write append delete rename"
OPERATIONS=(cd_into list_directory
            cd_and_list)

ROOT_DIR="/tmp/dirtest.$RANDOM"


PERMS="000 111 222 333 444 555 666 777"
CREATION_SUCCESS=([000]=0 [111]=0 [222]=0
                  [333]=0 [444]=0 [555]=0
                  [666]=0 [777]=0)

echo "" > $LOGFILE
exec >  >(tee -a $LOGFILE)
exec 2> >(tee -a $LOGFILE >/dev/null)

setup

cd $ROOT_DIR
for current_dir in *; do
    echo "=== $current_dir ==="
    for operation in ${OPERATIONS[@]}; do
        execute_action $operation $current_dir
    done
    for perm in $PERMS; do
        act_all --pre $current_dir $perm
    done

    if (( ${CREATION_SUCCESS[$perm]} )); then
        echo "create_file $perm SUCCESS"
        for perm in $PERMS; do
            act_all --post $current_dir $perm
        done
    else
        echo "create_file $perm FAILURE"
    fi
done


# cleanup
find $ROOT_DIR -type d -exec chmod 777 {} \; 
find $ROOT_DIR -exec chmod 777 {} \; 
rm -rf $ROOT_DIR