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The recent changes to ssh had broke container exits after qemu had finished, which broke to-disk etc.

The recent changes to ssh had broke container exits after qemu had finished,
which broke to-disk etc.
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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 addresses a critical issue where processes were not reliably terminating after QEMU exited, leading to resource leaks and instability in container operations. The changes focus on improving the lifecycle management of child processes, centralizing asynchronous runtime control, and enhancing the reporting of QEMU's operational status to ensure a more robust and predictable system behavior.

Highlights

  • Enhanced Process Lifecycle Management: Implemented set_parent_process_death_signal for child processes to ensure they receive a TERM signal if their parent exits, preventing orphaned processes and resource leakage.
  • Centralized Asynchronous Runtime: Consolidated the Tokio runtime initialization to a single point in the main application, ensuring consistent asynchronous execution across different commands.
  • Improved Supervisor Status Signaling: Introduced a running flag within the SupervisorStatus and a finish() method for the StatusWriter to explicitly communicate QEMU's operational state and graceful termination.
  • Graceful Container Exit Handling: Modified the container entrypoint to return Ok(()) on termination signals, allowing for proper async task cleanup rather than an abrupt process exit.
  • Robust Status Monitoring: Updated the status file monitor to remove explicit timeouts and instead rely on the running status to determine when to cease streaming updates, improving reliability.
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Code Review

This pull request addresses a task leakage issue that occurs after QEMU exits. The changes are a significant improvement to the robustness of process and task management.

The key improvements include:

  • A more reliable status monitoring mechanism that uses an explicit running flag for termination, replacing the previous timeout-based approach.
  • Better child process management by setting pdeathsig on podman exec calls, ensuring they are terminated if the parent process dies unexpectedly.
  • Centralized Tokio runtime creation, which is a good practice.

While most of the changes are excellent, I've identified one high-severity issue in main.rs where std::process::exit(0) is used for termination. This is a problematic pattern as it bypasses graceful shutdown procedures, including that of the Tokio runtime, and can mask underlying issues with non-terminating tasks. I've left a specific comment with a suggestion to fix this.

@cgwalters cgwalters merged commit 3df87e0 into main Sep 19, 2025
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