The Nineteenth Byte - 2017-05-30 (page 5 of 5)

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11:08 PM

I'm pretty sure a-ta.co has a big security flaw because of the .jsd system I use.

Destructible Lemon

...

9

Q: Prisoner's Dilemma v.3 - Petri Dilemma

A mad scientist has just created a new species of bacterium! He has decided to name it Noblus Gentlemanus, after observing its behaviour. However, his bacteria have ran out of food, and are have declared war, as they are able to harvest other bacterium's corpses for enough food to create copies...

king-of-the-hill python

the leaderboard...

the almost-a-joke answer comes second

@DestructibleLemon My Elephant was crushed... But it was so smart!

@ATaco *hacks a-ta.co*

Destructible Lemon

seriously though, wtf happened

Actualy, first looks up what .jsd is

Then hacks a-ta.co

11:10 PM

To my knowledge, Nothing.

But It's Javascript Document to me.

Destructible Lemon

I think I can win this petri dilemma

Re-inventing the wheel is how I roll (▀̿Ĺ̯▀̿ ̿)

Destructible Lemon

70 tit for tat!!!11

What do you use it for?'

.jsd documents, when requested from a-ta.co, take any blocks of <script type="server/javascript"></script>, and executes them in a (very weakly contained) sandbox.

11:12 PM

So what you're saying is I can execute arbitrary node on your server.

If you can find a way to upload a .jsd file to my /www/www directory.

But currently, to my knowledge, I don't allow the creation of arbitrarily named documents anywhere in that subdirectory, so there's be no way to normally call it.

Question: if I have:

Then it's not a security flaw, it's just shitty code :P

@Downgoat *guetion

why

11:14 PM

class Foo {
    void method() {
        doThing(new Goat() {
            void otherThing() {
                // How do I call an INSTANCE method of the parent instance in which this is being called (of Foo)
            }
        });
    }
}

I try Foo.this but none of the fields are populated when I do that

@Phoenix It's a security flaw waiting to happen.

@Downgoat Is this Java

yes

class Foo {
    void method() {
        Foo scoped = this;
        doThing(new Goat() {
            void otherThing() {
                // How do I call an INSTANCE method of the parent instance in which this is being called (of Foo)
               scoped.thing
            }
        });
    }
}

I can't wrap my head around the function nesting.

11:15 PM

I think that works.

@Downgoat wait ono i spel quetion wrong

^^ Seems far too hacky. Then again, Java.

@ATaco *self

@ASCII-only ono :(

The point stands, Use scoping.

It works in Lua, after all

11:16 PM

@Phoenix ... How is this hacky

@ATaco 10/10 quality solution

IDK.

Why doesn't this.thing work?

You're not in an inner class.

Because this refers to the Goat instance.

@Phoenix ... You are, how is new Goat not an inner class

Wait I get it.

I was confused by the nesting

11:17 PM

I'm saddened print doesn't return anything, when it could return print so you could chain together prints.

@Phoenix :|

@ATaco example?

print ("Hello, World!")
("How are you?")

@ATaco there's a good reason why this doesn't exist

Or just print ("Hello, World!", "How are you?")

That tab sepeartes though.

11:19 PM

@ATaco solution: use cheddar

Try it online!

Chaining is newline separated!

Destructible Lemon

who is hyped for my koth?

anyone?

I wish print returned the Printed string

And yes, Lua doesn't love your whitespace.

So you could use it in golfy ways.

Destructible Lemon

11:20 PM

ok, I expected this

@DestructibleLemon what is the koth?

@DestructibleLemon Not really tbh

Destructible Lemon

@Mendeleev dungeon of botdom

@DestructibleLemon no idea what that is

Destructible Lemon

based on this

11:21 PM

0

Q: Log Scales are for Quitters

Everyone knows log scales are for quitters. Therefore, you must write a program or function that de-quitifies a bar graph with a log scale given a base. The bar graph input is taken as a single string which is a list of bars, where each bar of the log scale bar graph is separated by the printab...

code-golf ascii-art

Try it online!

Is that your name for Maze KOTH or did that happen forever ago?

Destructible Lemon

Chatroom of botdom

Discussion of my dungeon of botdom koth

@Phoenix that got abandoned

if you want, you could try making a bot, and if you did, I would post the challenge

@Mendeleev wtf

exactly my thoughts

Destructible Lemon

thank you

anyway, would you like to participate in this koth?

when it is soon posted to main

11:23 PM

link to sandbox post?

Destructible Lemon

tbh that just has a bad description of the link I already gave

also I didn't bother with making a base class

yet anyway

@DestructibleLemon you what

Destructible Lemon

@ASCII-only hey, they can still implement the things themselves

if you really want, I'll make a base class

-1 this will only discourage people from participating

Destructible Lemon

fine

what happens if you have an import loop?

11:25 PM

i mean you don't have to but imo more people will participate if you have a base class so they don't have to reimplement some of the more simple stuff

@DestructibleLemon it breaks :P

What language are you using?

Destructible Lemon

python

Welp, I have no idea how Python OOP works

Anonymous

@DestructibleLemon Nothing really, except your modules may be missing stuff when they get loaded initially. Try not to do them, but if you do, you should be mostly OK.

Destructible Lemon

if I do from thingy import this specific thingy

would that be fine?

Anonymous

11:28 PM

Probably

@ATaco :( doesn't work

Anonymous

The only thing that causes problems is if you have a cyclic import and the module initialization requires something from that import

Destructible Lemon

well, I might as well not risk it

@Downgoat Worth a shot.

Destructible Lemon

ok now I made the base class

11:29 PM

See? Didn't take long

Anonymous

So if you have b.py: from a import x; y = a.x and a.py: import b; x = 5, then you'll have issues.

@ATaco already did shot and bullet went through but called 911 anyway :P

Anonymous

But if everything that depends on the other module is wrapped inside of a function or a class, you should be ok

If you name your file __main__.py, does that bork anything if you try to import it?

Anonymous

@Phoenix I'm about 90% sure the answer is "yes why would you do that what is wrong with you"

11:34 PM

@Mego Try it online!

Destructible Lemon

also git didn't cache my special password

phoenix I blame you

Right, because your special password is special

It only caches ordinary passwords.

Destructible Lemon

come on

@Phoenix Thats like making a function called exit while you are in python's repl

Destructible Lemon

yup, thats it

I'm disabling 2fa because it is too insecure

11:36 PM

@WheatWizard Works

 ~  python
Python 2.7.13 (default, Jan 19 2017, 14:48:08)
[GCC 6.3.0 20170118] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> def exit():
...     print 'foo'
...
>>> exit()
foo
>>>

Yes but now you need an interrupt to exit

Or EOF

The point being, it lets you redefine exit(), but you cannot import __main__

import __main__ doesn't error

See above TIO link

@WheatWizard or __import__("sys").exit()

Anonymous

@Phoenix Or __builtins__.exit()

Anonymous

11:40 PM

@WheatWizard It doesn't error, but it also doesn't work.

Destructible Lemon

@WheatWizard am I the only one who doesn't use exit in python repl

I too use <C-d>

Anonymous

__main__ is already in sys.modules, so the import just silently does nothing

Destructible Lemon

those underscores are there for a reason!!!

or __import__("subprocess").call(["killall","python"])

11:41 PM

<C-d> is also how I exit irb or Bash

I also use <C-d> but I used to use exit until I borked my repl by redefining exit

Anonymous

@WheatWizard I just yank the power cord out of my computer

10

Anonymous

That's also how most people exit vim

@WheatWizard What if you have other python processes running? __import__("subprocess").call(['kill', str(os.getpid())])

@Phoenix Good point, I also think my code doesn't work

11:43 PM

@WheatWizard Doesn't exit reset after reentering the repl

Destructible Lemon

^

I also want to know what kind of repl you are running

Anonymous

@Phoenix Necessary sacrifices

If you assume there are no other python processes, pkill is golfier.

@Phoenix Yeah but it caused some weird things to happen I'm not 100% sure redefining exit was the root of the problem but as soon as I did it python stopped working

Anonymous

@WheatWizard Have you tried rm -rf ~ yet? 9/10 goats say it solves all problems

3

11:46 PM

Assuming you don't care about your computer ` __import__("subprocess").call(['rm', "-rf","/","--no-perserve-root"])` also works

I'm really bothered by the fact that it isn't the p part of pgrep that makes it search for proccesses by regex, but killing a process by regex is pkill

Ninja'd

@WheatWizard It does not, you need --no-preserve-root

Or rm -rf /* I suppose

Anonymous

@Phoenix For a long time, I thought pkill meant process kill

Anonymous

It took me a while to realize that was dumb

11:47 PM

To be fair, it's a dumb name.

@Phoenix Sorry, I didn't bother to test my code

0

Q: Radiation hardened semiquine

Challenge Write two programs that: run in two different programming languages. when one program is run, it outputs the second program, and vice versa. The two programs must be different (no polyglots). Here's the catch though: The programs must be radiation hardened. This means that when...

code-challenge quine radiation-hardening

How do you write a script that adds a man page for your program?

21

Q: How do I manually install a man page?

How do I install a man page file system-wide? For example, if I have a man page file examplecommand.1, how do I install it so that I can just type man examplecommand to view it?

command-line manpage

user image

2

@WheatWizard Thanks

11:58 PM

@Mego Doesn't it?

user165474

Hm. I'm still here. Interesting.

@Phoenix Where did you get that?

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The Nineteenth Byte

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