This docker image provides the old versions of the D compiler. The container takes source code encoded as Base64 on the command line and decodes it internally and passes it to dreg. The compiler tries to compile the source and, if successful, outputs the program's output. Compiler errors will also be output, to stderr.

This container is used in the dlang-tour to support online compilation of user code in a safe sandbox.

Run the docker container passing the base64 source as command line parameter:

bsource=$(echo 'void main() { import std.conv; std.stdio; writefln("Hello World, %s", 42.to!int); }' | base64 -w0)
docker run --rm dlangtour/core-dreg $bsource

It returns:

Up to      2.062  : Failure with output:
-----
onlineapp.d(1): Error: undefined identifier 'to'
onlineapp.d(1): Error: undefined identifier 'to'
-----

Since      2.063  : Success with output: Hello World, 2

As this Docker images is intended for run.dlang.io, it base64-encodes the input. As this is a bit bulky, for local usage, this wrapper is recommended. For example, create this file dreg and add it to your PATH:

#!/bin/bash
docker run --rm dlangtour/core-dreg $(echo "$1" | base64 -w0) ${@:2}

Usage is as follows:

dreg "import std.experimental.allocator;" -c

it returns:

Up to      2.068.2: Failure with output:
-----
onlineapp.d(1): Error: module allocator is in file 'std/experimental/allocator.d' which cannot be read
import path[0] = /path/to/dmd/dmd2/linux/bin64/../../src/phobos
import path[1] = /path/to/dmd/dmd2/linux/bin64/../../src/druntime/import
-----

Since      2.069.2: Success and no output

The docker image gets built after every push to master and pushed to DockerHub.

Boost license.