Need solution for running dev container with rootless Docker

[jcr010910]

Writing to the host filesystem fails unless the container is run with root privileges.

Steps to Reproduce:

1. Set up rootless Docker environment (dockerd-rootless-setuptool.sh install)
2. Start a development container (docker run ...)
3. Attempt to write files from the container to the host filesystem (echo "test" > /host/path/file.txt)

Expected Behavior:
Files should be written successfully to the host filesystem without needing to run the container as root.

[timsu92]

Did you try to alter file permissions? Like using chmod?

[samruddhikhandale]

To write files from a rootless Docker container to the host filesystem, you need to ensure that the user inside the container has the necessary permissions to write to the specified directory on the host. Here are the steps to achieve this:

• Ensure Correct User Mapping: When running Docker in rootless mode, the user inside the container is mapped to a user on the host. Ensure that the user inside the container has the same UID and GID as the user on the host who has write permissions to the target directory.
• Set Up Permissions on the Host: Ensure that the target directory on the host has the appropriate permissions to allow writing by the user mapped from the container.
• Run the Container with the Correct User: Use the --user flag to specify the UID and GID when running the container.

@jcr010910 Which image are you using? The images hosted from https://github.com/devcontainers/images have ^ configured to support rootless docker.

[BrentBradburn]

From inside the dev container, it appears as if the 'vscode' user has the same id as the host user (1000).
However the actual user id, when mapped to the host, was (100999).
So you can work around this, as a hack, with chmod o+w.

I don't think this statement is correct...

The images hosted from https://github.com/devcontainers/images have configured to support rootless docker.

Note: Rootless Docker is not the same thing as a container-internal non-root user.