Two devenv patches

[cgwalters]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @cgwalters, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the development environment's capabilities by enabling nested containerization and virtual machine support within devcontainers without relying on the broad --privileged flag. It achieves this through a new Python-based setup script that intelligently configures user namespaces, mount propagation, and device access, coupled with a dedicated self-test script to validate these complex interactions. Additionally, it refines a GitHub Action for more robust package cleanup.

Highlights

• Refactored Nested Container Setup: The devenv-init.sh script has been completely refactored to delegate its complex logic to a new Python script, userns-setup. This new script intelligently handles mount propagation, KVM device permissions, and subuid/subgid configuration for rootless Podman in constrained UID namespaces, as well as containers.conf adjustments.
• Reduced Privileges for Devcontainers: The common/.devcontainer/devcontainer.json configuration now replaces the broad --privileged flag with a set of minimal, specific security options. These options (label=disable, unmask=/proc/*, /dev/net/tun, /dev/kvm) provide the necessary capabilities for nested Podman and VM support without granting excessive privileges.
• New Self-Test for Nested Functionality: A new devcontainer-test target has been added to the Justfile, which executes a new devenv-selftest.sh script. This script verifies that nested Podman and VM functionality (using bcvk) works correctly within the devcontainer, ensuring the new setup is effective.
• Improved GitHub Action Package Cleanup: The bootc-ubuntu-setup GitHub Action has been enhanced to use glob patterns for identifying unwanted packages and now includes a check (dpkg -l) to ensure a package is installed before attempting to remove it, preventing errors during cleanup.

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Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/test-devcontainer.yml

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[gemini-code-assist]

Code Review

This pull request introduces several improvements to the development environment setup. Key changes include replacing the --privileged flag with more granular security options for nested containers, which is a significant security enhancement. The devenv-init.sh script has been refactored from a shell script into a more robust and maintainable Python script (userns-setup). A new self-test script (devenv-selftest.sh) and a corresponding Justfile command have been added to validate the nested container setup. Additionally, the GitHub Action for setting up Ubuntu has been improved for more reliable package removal.

The changes are well-structured and improve the security and maintainability of the development environment. I have a couple of minor suggestions for the new Python script to improve its robustness and adherence to Python conventions.

[cgwalters]

OK, well the plus side of adding tests is it found out that the c10s devenv was broken. Man, figuring out that /usr/bin/newuidmap was missing file caps becuase we have a broken legacy buildsystem for quay.io/centos/centos:stream10 was a pain.

[gursewak1997]

looks decent to me