psmux_psmux/docker

psmux Docker Dev Environment

A Windows container with Rust (MSVC), Visual Studio Build Tools, and OpenSSH — ready to build and run psmux.

What's inside

Component	Details
Base image	mcr.microsoft.com/powershell:windowsservercore-ltsc2022
Rust	stable-x86_64-pc-windows-msvc via rustup
MSVC	Visual Studio Build Tools 2022 (cl.exe, link.exe)
SSH	OpenSSH Server on port 2222 (key-only auth, no passwords)
Shell	PowerShell 7 with auto-loaded VS dev environment
Git	MinGit for cloning repos

Quick start

One command

pwsh -File docker\Run-PsmuxDev.ps1

This will:

1. Generate an SSH key at ~/.ssh/psmux_docker_key (if not present)
2. Build the Docker image (first time only)
3. Start the container with your public key injected
4. Print the SSH command to connect

Manual steps

1. Build the image

cd docker
docker build -t psmux-dev .

Note: The build takes a while (~15-30 min) because it downloads and installs Visual Studio Build Tools. The resulting image is large (~15 GB). This is expected for Windows MSVC containers.

2. Run the container

# Generate SSH key (once)
ssh-keygen -t ed25519 -f ~/.ssh/psmux_docker_key -N "" -C "psmux-docker"

# Run with your public key
$pubkey = Get-Content ~/.ssh/psmux_docker_key.pub
docker run -d --name psmux-dev --isolation=hyperv `
    -e "SSH_PUBLIC_KEY=$pubkey" `
    psmux-dev

3. SSH in

$ip = docker inspect psmux-dev --format "{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}"
ssh -i ~/.ssh/psmux_docker_key -p 2222 ContainerAdministrator@$ip

4. Build psmux

git clone https://github.com/psmux/psmux.git
cd psmux
cargo install --path .
psmux --version

SSH authentication

This container uses key-only SSH — no passwords. Your public key is passed in via the SSH_PUBLIC_KEY environment variable at container start. The Run-PsmuxDev.ps1 script handles this automatically.

You can also mount a public key file:

docker run -d --name psmux-dev --isolation=hyperv `
    -v "$HOME\.ssh\id_ed25519.pub:C:\ssh_public_key" `
    psmux-dev

Verifying the toolchain

After SSH-ing in, these should all work:

rustc --version
cargo --version
where cl
where link

Safety notes

• No passwords are used — SSH key auth only
• Container runs with Hyper-V isolation (full VM separation from host)
• SSH listens on port 2222 to avoid conflicts with host sshd
• Key is stored at ~/.ssh/psmux_docker_key (never inside the repo)

File layout

docker/
  Dockerfile
  README.md
  Run-PsmuxDev.ps1               # Host-side: generates key, builds, runs, prints SSH command
  Tools/
    StartContainer.ps1            # Entrypoint: configures sshd with key auth, starts sshd
    InstallAll.ps1                # Build-time: installs Rust, VS Build Tools, OpenSSH, Git
    ImportVsDevEnv.ps1            # Loads VS dev environment (cl.exe, link.exe) into PowerShell
  Profile/
    Microsoft.PowerShell_profile.ps1   # Auto-loads Rust + MSVC env on every shell