local function warnUser(filename)
    print("WARNING: File '" .. filename .. "' has been detected which modifies the startup file of the computer, which can prevent it from starting up.")
end

local function searchFileForKeyword(filename, keyword, skipKey)
    local file = fs.open(filename, "r")
    if not file then return end

    local content = file.readAll()
    file.close()

    if content:find(skipKey) then
        return
    end

    if content:find(keyword) then
        warnUser(filename)
    end
end

local function searchDirectory(path, keyword, skipKey)
    -- Skip the /rom directory and its subdirectories
    if path == "/rom" or string.sub(path, 1, 5) == "/rom/" then
        return
    end

    local files = fs.list(path)
    for _, file in ipairs(files) do
        local fullPath = fs.combine(path, file)
        if fs.isDir(fullPath) then
            searchDirectory(fullPath, keyword, skipKey)
        else
            searchFileForKeyword(fullPath, keyword, skipKey)
        end
    end
end

local function main()
    local keyword = "startup"
    local skipKey = "2f02e58e09db074280d6c10106c7511a"
    local rootPath = "/"

    searchDirectory(rootPath, keyword, skipKey)
end

main()