antivirus installer

if not fs.exists("/disk") or not fs.isDir("/disk") then
    print("Waiting for disk...")
end

while not fs.exists("/disk") or not fs.isDir("/disk") do
    sleep(1)
end

print("Installing the boot disk program will delete all the files on the disk.")
write("Continue? [Y/n]: ")

local resp = read()
if resp:lower():find("n") then
    print("Install cancelled.")
    return
end

for _, v in pairs(fs.list("/disk")) do
    pcall(fs.delete, "/disk/" .. v)
end

local content = http.get("http://pastebin.com/raw.php?i=BvvkvEp4")
if not content then
    printError("Failed to download boot program from pastebin! Please try again later.")
    return
end

local f = io.open("/disk/startup", "w")
f:write(content.readAll())
f:close()

local side = nil
for _, v in pairs(peripheral.getNames()) do
    if peripheral.getType(v) == "drive" and
        peripheral.call(v, "hasData") then
        if peripheral.call(v, "getMountPath") == "disk" then
            side = v
            break
        end
    end
end

if side then
    peripheral.call(side, "setDiskLabel", "Rescue Boot Disk")
end

if term.isColor() then
    term.setTextColor(colors.yellow)
end

print("")
print("Installation successful!")
print("Follow these steps to disinfect a computer:")
print("1. Disconnect the computer from any modem networks.")
print("2. Make sure there are no other computers which can access the disk drive.")
print("3. Hold Ctrl + S on the infected computer to shut it down.")
print("4. While the computer is turned off, insert the boot disk.")
print("5. Turn on the computer, and follow on-screen prompts (if any).")
print("")
print("Thanks for using 1lann's rescue boot disk!")