racket-langserver didn't work in a devcontainer, and a workaround

[SFurnace]

Environment

• OS: Windows 10 + Docker-Desktop
• VS Code Version [1.59.1]
• Racket version [8.2]
• Magic Racket version [0.5.7]

Error message

I use xvfb-run racket in a devcontainer, but racket-langserver doesn't work. I only get error message like that:

[Error - 下午2:22:06] Starting client failed
Launching server using command xvfb-run racket failed.

Workaround

I tried many times, and finally found if I change the serverOptions in extension.js from

        const executable = {
            command: racket,
            args: ["--lib", "racket-langserver"],
        };

to

        const executable = {
            command: racket,
            args: ["--lib", "racket-langserver"],
            options: { shell: true }
        };

then racket-langserver can work correctly. I guess vscode can communicate with the xvfb-run racket process by stdin/out, only when wrapping in a shell.

By the way, I put my devcontainer.json at here.

[sdjdd]

Doesn't work for me. My solution:

create a bash script xvfb-racket:

#!/bin/bash

for i in $*;
do
    params=" $params $i"
done

xvfb-run racket $params

add to $PATH

change the Racket Path config to xvfb-racket.

[SFurnace]

Doesn't work for me. My solution:

create a bash script xvfb-racket:

#!/bin/bash

for i in $*;
do
    params=" $params $i"
done

xvfb-run racket $params

add to $PATH

change the Racket Path config to xvfb-racket.

Maybe "$@" is a better way?

[rocketnia]

Just as @SFurnace suggested, I got this working using:

#!/bin/bash

xvfb-run racket "$@"

I'm using VS Code with the Magic Racket extension in Windows 10, talking to racket-langserver in a VirtualBox VM running Linux Mint.

[Eugleo]

Hey guys, is there anything I can do to make this simpler for you? Assuming no, closing issue, will re-open if need be. I will also link to this issue from the readme so that others can follow your instructions to get it working.

[Eugleo]

In the v0.6.0 it is possible to configure the command and the args that are used to launch the langserver. It should be possible to set the command to xvfb-run and the args to racket, [...and the args that are there by default].

[elmisback]

Confirming xvfb-run + racket --lib racket-langserver works on Windows WSL on v0.6.1.

[elmisback]

Another note--if multiple VSCode windows are opened, I found the --auto-servernum / -a argument to xvfb-run was required to avoid xvfb failing due to the default server number already being in use.

[brettgilio]

Doesn't work for me. My solution: create a bash script xvfb-racket:

#!/bin/bash

for i in $*;
do
    params=" $params $i"
done

xvfb-run racket $params

add to $PATH change the Racket Path config to xvfb-racket.

Maybe "$@" is a better way?

@Eugleo It would be nice if this file were included in either the magic-racket distribution as an in-built fallback. If the server fails to initialize then the bash sugar could be executed. I tried to use magic-racket today using https://github.com/gitpod-io/openvscode-server on a headless server and found myself having to tweak all kinds of things until I found this issue.

[Halkcyon]

Just to put this all together since I was setting this up from a fresh WSL2 Ubuntu install, I needed to take the following steps.

Dependencies:

$ sudo apt install -y --no-install-recommends \
    racket \
    libjpeg62-dev \
    libgtk2.0-dev \
    xvfb
$ raco pkg install racket-langserver

Script wrapper:

$ cat << EOF > xvfb-racket
#!/usr/bin/env bash
xvfb-run --auto-servernum racket "$@"
EOF
$ chmod +x xvfb-racket

Then I needed to point my configuration at it:

{
  "magicRacket.languageServer.command": "/home/$USERNAME/xvfb-racket",
  "magicRacket.general.racketPath": "/home/$USERNAME/xvfb-racket"
}

This made the extension work on files saved to disk, but not anonymous files in the editor.

[enricopolanski]

I tried to follow all of the comments here, using WSL 2 + Ubuntu 22.04.

It doesn't work for me.

In VSCode I get:

[Info  - 4:37:16 PM] Connection to server got closed. Server will restart.
[Info  - 4:37:17 PM] Connection to server got closed. Server will restart.
[Info  - 4:37:17 PM] Connection to server got closed. Server will restart.
[Info  - 4:37:17 PM] Connection to server got closed. Server will restart.
[Error - 4:37:17 PM] Connection to server got closed. Server will not be restarted.

If I try to execute highlight in REPL I get:

➜ /home/aquazi/xvfb-racket --repl --eval '(enter! (file "/home/aquazi/bench/racket-experiments/foo.rkt"))'
racket: bad module path: '(file "") derived from command-line argument: 

➜  racket-experiments "hello world"
hello world: command not found

[aidenstern]

This worked for me on WSL2 + Ubuntu 22.04

Dependencies:

$ sudo apt install -y --no-install-recommends \
    racket \
    libjpeg62-dev \
    libgtk2.0-dev \
    xvfb
$ raco pkg install racket-langserver

VSCode configuration:

}
    "magicRacket.languageServer.command": "xvfb-run",
    "magicRacket.languageServer.arguments": [
        "--auto-servernum",
        "racket",
        "--lib",
        "racket-langserver"
    ],
}