FS-3: Secure file deletion

Description

Your task is to implement a C++ program that deletes the file from the filesystem along with its content by replacing every byte in the files with ‘\0’ character.

Requirements

• Write a C++ program named “hacker-rm” that accepts a path to a file as a command-line argument.
• Implement proper error handling to check if the file exists and if the input path is valid.
• Open the file for writing and replace every byte with the null character (‘\0’).
• Remove the file from the file system after overwriting its content.
• Ensure that your program works for various file sizes and types.

Hint: you can use write, stat, lseek, unlink function to solve the problem.

Expected result

The resulting application should be able to build and execute from command line as follows:

make
./hacker-rm file-to-erase

The final solution should contain a Makefile for the multi-stage build. The Makefile should also contain targets all and clean. It’s recommended to have compiler and compiler flags to be declared as a Makefile variables. Alternatively, cmake could also be used instead of make.