BAS-Connect: SSH Dev Space Tunnel CLI

A utility tool for creating secure SSH tunnels to Business Application Studio (BAS) Dev Spaces, allowing direct SSH access to your development environment.

Description

This tool automates the process of establishing an SSH connection to your Business Application Studio dev space. It handles:

• Automatic Authentication: Opens a browser window for authentication towards the BAS landscape
• Dev Space Auto-Start: Starts your dev space if it's not running
• SSH Configuration: Automatically sets up your local SSH config
• Connection Resilience: Automatically reconnects if the connection is lost

Once running, you can connect to your dev space using standard SSH commands and tools like VS Code Remote - SSH.

Prerequisites

• Node.js (v22 or later)
• The BAS landscape URL (e.g., https://xxx.eu20cf.applicationstudio.cloud.sap) and an already created dev space ID (e.g., ws-xxxx)

Usage

You can simply run the script without any arguments, and it will prompt you for the necessary information:

npx bas-connect

Command Line Arguments

For faster usage, the script accepts also the following command-line parameters:

Argument	Short	Description	Example
--landscapeUrl	-u	Your BAS landscape URL	--landscapeUrl https://xxx.eu20cf.applicationstudio.cloud.sap
--devspaceId	-d	Your dev space ID	--devspaceId ws-xxxx
--sshPort	-p	Local SSH port to use (default: 22222)	--sshPort 22222
	-L	Forward extra ports. Can be used multiple times	-L 4004:4004 (local:remote)

Example with command line arguments:

npx bas-connect --landscapeUrl https://xxx.eu20cf.applicationstudio.cloud.sap --devspaceId ws-xxxx --sshPort 22222
npx bas-connect -u https://xxx.eu20cf.applicationstudio.cloud.sap -d ws-xxxx -p 22222

Environment Variables

You can also set the following environment variables in a .env file to avoid entering them every time:

BAS_LANDSCAPE_URL=https://xxx.eu20cf.applicationstudio.cloud.sap
BAS_DEVSPACE_ID=ws-xxxx
BAS_SSH_PORT=22222

Connecting to your dev space

Once the tunnel is established, you will see the connection details in the terminal.

The script will keep running to maintain the tunnel. Press CTRL+C to stop the tunnel when you're finished.

Troubleshooting

Connection Issues:

• Ensure you have an active internet connection
• Verify your dev space exists and is accessible (only two dev spaces can be active at a time)
• Check that the local port is not already in use

Authentication Issues:

• If authentication fails, try clearing browser cookies and try again

Contributing

This script is based on the VS Code Extensions but adapted to provide fixed SSH ports and a more streamlined CLI experience with the ability to automatically start the dev space and reconnect if the connection is lost.

You can run the dev script with arguments like this npm run dev -- -- -u xxx.com -d ws-xxxx the double -- are needed to first pass it to te npm run script and then again to ts-node

Contributions are welcome!

Disclaimer

This is an unofficial tool and is not affiliated with, endorsed, or sponsored by SAP SE or its affiliates. It is provided "as-is" without any warranty. Use at your own discretion and risk.