Py-solc and solidity imports

Question

How can I compile solidity files which perform relative imports through py-solc? Here's a minimal example:

Directory structure

my-project
   - main.py
   - bar.sol
   - baz.sol

main.py:

from solc import compile_source

def get_contract_source(file_name):
    with open(file_name) as f:
        return f.read()

contract_source_code = get_contract_source("bar.sol")

compiled_sol = compile_source(contract_source_code)  # Compiled source code

baz.sol:

pragma solidity ^0.4.0;

contract baz {
    function baz(){

    }
}

bar.sol:

pragma solidity ^0.4.0;

import "./baz" as baz;

contract bar {
    function bar(){

    }
}

When I try to run the python file I get the following error:

solc.exceptions.SolcError: An error occurred during execution
        > command: `solc --combined-json abi,asm,ast,bin,bin-runtime,clone-bin,devdoc,interface,opcodes,userdoc`
        > return code: `1`
        > stderr:

        > stdout:
        :17:1: Error: Source "baz" not found: File outside of allowed directories.
import "./baz" as baz;
^----------------------^

I'm still not 100% clear on how imports work. I've reviewed the docs and it seems like I need to pass some extra arguments to the compile_source command. I've found some potentially useful docs here and I think I need to play around with allow_paths or compile_files which I will. If I find a solution before I get an answer I will post what I find.

Answer 1

Ok, turns out compile_files is exactly what I need.

The new compile command is

import os

PROJECT_ROOT = os.path.dirname(os.path.dirname(__file__))
compiled_sol = compile_files([os.path.join(self.PROJECT_ROOT, "bar.sol"), os.path.join(self.PROJECT_ROOT, "baz.sol")])

and it turns out my import was wrong. I need to import baz like import "./baz.sol" as baz; - I was missing the .sol extension.