I can save 1 more char on the current contest with py3.9
okthxbye

test install to a debian vm and document any issues

Since the C++20 standard has been published in December 2020 piston should use it.

This could be as easy as changing -std=c++17 to -std++20 in

See packages/ for existing examples
Please merge to v3 branch!

See packages/ for existing examples
Please merge to v3 branch!

Since dash (an implementation of POSIX sh) is already installed, it would be nice to be able to directly use it (instead of having to write to a file then execute dash with it).

https://github.com/engineer-man/piston/blob/master/var/install.txt#L19 mentions debian/arch/mac os

You have Arch 😂 debian should be analogous to Ubuntu. Ubuntu is based from Debian. I am 99% certain the packages you install have the same names. OSx would run in a VM, which could be any of the above three (that is how docker on osx works).

Suggestion

Remove at least arch. Maybe debian. Maybe make a docker image using alpine so Mac users can do something almost as easy as brew install (docker run ...)

See packages/ for existing examples
Please merge to v3 branch!

For example:

{
	"input": "there",
	"source": "print('hello' + 1)",
	"language": "python"
}

should probably respond with

{
  "ran": true,
  "language": "python",
  "version": "3.6.9",
  "output": "",
  "error": "Traceback (most recent call last):\n  File \"code.code\", line 1, in <module>\n    print('hello' + 1)\nTypeError: can only concatenate str (not \"int\") to str"
}

Recent exploit was published on sudo: https://www.qualys.com/2021/01/26/cve-2021-3156/baron-samedit-heap-based-overflow-sudo.txt

The hosted version of piston on emkc.org though I'm not sure if this is serious given your security model.

POC:

$ curl -sX POST https://emkc.org/api/v1/piston/execute -d '{"language":"bash","source":"sudoedit -s '"'"'\\'"'"' `perl -e '"'"'print \"A\" x 65536'"'"'`","stdin":"","args":[""]}' -H "Content-Type: application/json" | jq
{
  "ran": true,
  "language": "bash",
  "version": "4.4.20",
  "output": "code.code: line 1:  2264 Segmentation fault      sudoedit -s '\\' `perl -e 'print \"A\" x 65536'`",
  "stdout": "",
  "stderr": "code.code: line 1:  2264 Segmentation fault      sudoedit -s '\\' `perl -e 'print \"A\" x 65536'`"
}

See packages/ for existing examples

Please merge to v3 branch!

See packages/ for existing examples

Please merge to v3 branch!

See packages/ for existing examples
Please merge to v3 branch!

See packages/ for existing examples

Please merge to v3 branch!

See packages/ for existing examples

Please merge to v3 branch!

When trying to call the version api listed in the readme it returns a 404 error

See packages/ for existing examples
Please merge to v3 branch!

See packages/ for existing examples
Please merge to v3 branch!

Most of the time users want a sandbox environment to test how a function from a package works; it would be very useful to have an option to provide a list of packages that should be installed on the container before code execution.

Something like this would be my suggestion to keep backward compatibility:

{
    "language": "python",
    "source": "import bcrypt\npassword = b\"super secret password\"\nhashed = bcrypt.hashpw(password, bcrypt.gensalt())\nif bcrypt.checkpw(password, hashed):\n    print('It Matches!')\nelse:\n    print('It Does not Match :(')",
    "stdin": "",
    "args": [
    ],
    "packages": [
        "bcrypt"
    ]
}

You should update bash, the current one is ~4 years old.

See packages/ for existing examples
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See packages/ for existing examples

Please merge to v3 branch!

See packages/ for existing examples

Please merge to v3 branch!

Update rust to a newer version, the one used currently is from 2019

See packages/ for existing examples

Please merge to v3 branch!

Programs like:

bash

yes

and

cpp

#include <iostream>

int main()
{
    while (true)
    {
        &printf == 0x000;
        printf("test");
    }
}

cause the API to "hang" and not send any reply.

See packages/ for existing examples
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See packages/ for existing examples
Please merge to v3 branch!

See packages/ for existing examples
Please merge to v3 branch!

See packages/ for existing examples
Please merge to v3 branch!

See packages/ for existing examples

Please merge to v3 branch!

Add support for COW: https://esolangs.org/wiki/COW

See packages/ for existing examples
Please merge to v3 branch!

engineer-man/piston-bot#5

I would like to implement this functionality in piston.
There are two ways I think I can do this.

• Add rust_test as a new language which would require the least changes.
• Add test as an arg to the rustc.
  • This might produce some changes in the current rust language behaviour.

Which path would be preferable.

See packages/ for existing examples
Please merge to v3 branch!

See packages/ for existing examples
Please merge to v3 branch!

POST to https://emkc.org/api/v1/piston/execute with a language that isn't whitelisted will result in a 200 with the response

{"output":""}

Here's some code to reproduce it:

fetch('https://emkc.org/api/v1/piston/execute', {
	method: 'POST',
	headers: {
		'Content-Type': 'application/json'
	},
	body: JSON.stringify({ language: 'randomstuff123', source: 'potatoes', args: [] }),
}).then(res => res.json()).then(console.log);

When running the below code

print(' ')

and

#include <iostream>
#include <iomanip>
std::cout << std::setw(8) << "hello" << '\n';

I would expect the outputs to be a single space for the first and

   hello

for the second but instead the bot says "Your code ran without output" on the first and outputs

hello

for the second.

Edit: the same thing happens with tabs.

When i try to do the following step:

install all necessary piston dependencies

The following error comes up: (when running apt-get update)

root@piston:/# echo 'source /opt/.profile' >> /opt/.bashrc
root@piston:/# echo 'export HOME=/opt' >> /opt/.profile
root@piston:/# echo 'export TERM=linux' >> /opt/.profile
root@piston:/# echo 'export PATH=$PATH:/opt/.local/bin' >> /opt/.profile
root@piston:/# export HOME=/opt
root@piston:/# export TERM=linux
root@piston:/# sed -i 's//root//opt/' /etc/passwd
root@piston:/# sed -i \

's/http:\/\/archive.ubuntu.com\/ubuntu/http:\/\/mirror.math.princeton.edu\/pub\/ubuntu/' \
/etc/apt/sources.list

root@piston:/# apt-get update
Err:1 http://security.ubuntu.com/ubuntu bionic-security InRelease
Temporary failure resolving 'security.ubuntu.com'
Err:2 http://mirror.math.princeton.edu/pub/ubuntu bionic InRelease
Temporary failure resolving 'mirror.math.princeton.edu'
Err:3 http://mirror.math.princeton.edu/pub/ubuntu bionic-updates InRelease
Temporary failure resolving 'mirror.math.princeton.edu'
Reading package lists... Done
W: Failed to fetch http://mirror.math.princeton.edu/pub/ubuntu/dists/bionic/InRelease Temporary failure resolving 'mirror.math.princeton.edu'
W: Failed to fetch http://mirror.math.princeton.edu/pub/ubuntu/dists/bionic-updates/InRelease Temporary failure resolving 'mirror.math.princeton.edu'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease Temporary failure resolving 'security.ubuntu.com'

Im on a debian VPS, can someone help me out?

Is there a way to use this as a docker container, so its an easy install?

For example:

{
	"input": "there",
	"source": "print('hello ' + input())",
	"language": "python"
}

should respond with

{
  "ran": true,
  "language": "python",
  "version": "3.6.9",
  "output": "hello there"
}

Deno allows you to import from remote URLs in your code when building, however piston disables networking.
Some libraries are required (e.g. std), which you pull from a remote url

import { printf } from "https://deno.land/std/fmt/printf.ts";
printf("Hello world!")

Stdin is passed as argv, which is probably why it turns newlines into spaces. To get around this, the stdin file should be written to directly, the same way the code is.

By the way, why does the API write to a temporary file and let the executor copy it instead of just writing to the final path? Is there a reason for that? I just copied what the previous API did when rewriting it.

not sure if piston works and can be installed on macos, if someone wants to take this on that would be great.

Piston API is the core API which manages the lifecycle of languages and code execution.

The Piston API entails both the package manager and execution manager.

• F#
• CoffeScript
• Rockstar
• Turbo Pascal and other Pascal Dialects with Free Pascal or Modern Pascal

I have no clue who would use these, I just think it's fun to add more languages