deepjyoti30 / locker

Just another naive locker program for Linux written in shell

Locker

   __            _             
  / /  ___   ___| | _____ _ __ 
 / /  / _ \ / __| |/ / _ \ '__|
/ /__| (_) | (__|   <  __/ |   
\____/\___/ \___|_|\_\___|_|   


Just another naive locker for *nix

Why this

I was just reading a book and then I found out that we can change the permissions of a directory to none for all the users and that basically doesn't let any program except rm access the directory.

Hence, I created a small, naive script that just adds the ability to change those permissions with a password, which means that the dir can be locked using the password.

Dependencies

Are you kidding me? It's written in Shell, no dependencies, enjoy.

Installation

• Clone the repo and enter the dir

  git clone https://github.com/deepjyoti30/locker && cd locker

• Install using make

  make install

Usage

Usage: locker OPERATION DIR [--help]

Positional arguments:

  OPERATION: Either of [lock] or [unlock] can be passed.
  DIR: Directory to operate on.

Optional arguments:

  --help: Show this message and exit

Credits

Probably the book UNIX: concepts and applications by Sumitabha Das.

locker's Issues

Existential crisis

The locked directory can be unlocked without password with just "chmod". So what's the purpose of this program or is it just a joke?

[Optimize] replace tr

FIRST

echo "$(tr ' ' '#' <<< "$dir_hash")"

can be replaced with

echo ${dir_hash// /#}

SECOND

echo "$(echo "$1" | tr '[:lower:]' '[:upper:]')"

can be replaced with

echo ${1^^}

THIRD

echo "$(echo "$1" | tr '[:upper:]' '[:lower:]')"

can be replaced with

echo ${1,,}

Could do this too

printf "[*] Passed OPERATION is: %s\n" "$(get_upper $OP)"

could just be changed to

printf "[*] Passed OPERATION is: %s\n" "${OP^^}"

And

OP=$(get_lower $1)

could be

OP=${1,,}

With these last 2 you can ditch the get_upper and get_lower functions