Mounting files into the container in the browser?

[adamnovak]

An example is given for mounting files into the container when running on a stand-alone WASI runner, but not in the context of the browser.

If I have a File or a Blob in hand in JavaScript when I am setting up the emulator, how would I expose that to the container at a certain path?

Bonus points if I can also mount something writable, like a resizable ArrayBuffer.

[alienself]

I am wondering the exact same thing, would be wonderful if we had the ability to attach files to a container in the browser

[ktock]

@adamnovak For container on WASI on browser configuration, you can provide file or directories as pre-opened fds to the container .

• Example1: w/ browser_wasi_shim :

  container2wasm/examples/wasi-browser/htdocs/worker.js

  Lines 25 to 33 in 31f6db8

  	fds = [
  	undefined, // 0: stdin
  	undefined, // 1: stdout
  	undefined, // 2: stderr
  	certDir, // 3: certificates dir
  	undefined, // 4: socket listenfd
  	undefined, // 5: accepted socket fd (multi-connection is unsupported)
  	// 6...: used by wasi shim
  	];

• Example2: w/ vscode-wasm : https://github.com/ktock/vscode-container-wasm/blob/26afb1790af51987687048b9bf8f16187ae7fe46/src/web/extension.ts#L76-L85