devcontainer.json: Extensions installed by VSIX are not installed automatically in devcontainer

[MBAatEJOT]

• VSCode Version: 1.74.3 (user setup)

• Local OS Version: Windows_NT x64 10.0.19044

• Remote OS Version: Ubuntu 20.04.5 LTS

• Remote Extension/Connection Type: Containers

• Logs:

2023-01-20 06:46:56.196 [error] Error: Failed Installing Extensions: my-unique-id.my-first-extension
    at g.installExtensions (/vscode/vscode-server/bin/linux-x64/97dec172d3256f8ca4bfb2143f3f76b503ca0534/out/vs/server/node/server.main.js:91:42)

Steps to Reproduce:

1. Create a custom VSCode Extension
2. Install the extension locally from VSIX
3. Start a dev container
4. Install your custom extension in the dev container by clicking the button
5. Click on the and then on
6. Rebuild your container
7. Check the logs for the Remote Server

The logs say that it failed to install the extension.

I guess that this problem happens because the dev container only checks the marketplace if there is an extension with this id.

However, since you can install extensions in the container that were previously installed locally via a VSIX file, the process of installing extensions via a devcontainer.json entry should be the following:

Search the marketplace for the extension
If Extension is found then
  install from marketplace
else if Extension exists locally then
  install by using locally installed extension
else
  log installation failed

Alternatively it's of course als possible to check for locally installed extensions first and then check the marketplace.

Does this issue occur when you try this locally?: No
Does this issue occur when you try this locally and all extensions are disabled?: Not applicable

[vscodenpa]

This feature request is now a candidate for our backlog. The community has 60 days to upvote the issue. If it receives 10 upvotes we will move it to our backlog. If not, we will close it. To learn more about how we handle feature requests, please see our documentation.

Happy Coding!

[vscodenpa]

🙂 This feature request received a sufficient number of community upvotes and we moved it to our backlog. To learn more about how we handle feature requests, please see our documentation.

Happy Coding!

[daltonv]

According to this issue #8827 this is already supported, but you have to give the path to the VSIX file in the container AND vscode currently incorrectly warns you this is incorrect syntax.

[NCC1701M]

According to this issue #8827 this is already supported, but you have to give the path to the VSIX file in the container AND vscode currently incorrectly warns you this is incorrect syntax.

Doesn't work for me.

I tried but the extension is not installed in the remote container.