tuxdock/DEVLOG.md

Tux-Dock Development Log

0.2-beta

This release introduces tuxreaperd, a micro init system for containers.

Micro init

• Split the reaper into two implementations:
  • tuxreaperdgnu.c: the original standard POSIX/libc daemon used as PID 1 inside containers created by tux-dock.
  • tuxreaperdasm.c: a new freestanding -nostdlib syscall engine for x86_64 and aarch64 with a tiny static footprint.
• Both run as subreapers (PR_SET_CHILD_SUBREAPER) with a SIGCHLD handler that reaps every reparented/terminated descendant, so orphaned processes never accumulate as zombies.
• Both forward SIGTERM/SIGINT/SIGHUP to the primary workload and propagate its exit status (128 + signal for signal deaths).
• compile.sh detects the host architecture and builds the freestanding implementation when possible, falling back to tuxreaperdgnu.c on failure or unsupported hosts.
• DockerManager::createContainer bind-mounts tuxreaperd into the container as PID 1 and resolves the binary next to the tux-dock executable when it is not in the current directory.

Tests

• Added tuxreaperd-zombie-tests, an in-container test suite that boots a container with tuxreaperd as PID 1 and verifies orphaned grandchildren are reaped (zero zombies), exit status is propagated, and docker stop cleanly shuts down via forwarded SIGTERM (exit 143).
• The HTML web test view now includes a "Tuxreaperd Zombie Reaping" section alongside the Docker integration and TUI transcript sections.

0.1.2-beta

This release adds signal trapping to prevent state corruption during long-running Docker operations.

Reliability

• Added SIGINT (Ctrl+C) signal trapping during busy operations to prevent premature exit and socket corruption
• Added SIGTSTP (Ctrl+Z) signal trapping during busy operations to prevent suspension mid-operation
• Signals chain to previous handlers when not busy, preserving normal exit and suspend behavior
• Trap re-installs after terminal I/O restoration cycles to maintain protection through Attach Shell sessions
• Used SA_RESTART flag to prevent EINTR on blocking socket reads during signal delivery

TUI

• Added visual feedback in busy modal when signals are trapped
• Shows "Ctrl+C ignored: operation in progress" when SIGINT is trapped
• Shows "Ctrl+Z ignored: operation in progress" when SIGTSTP is trapped

0.1.1-beta

This release establishes the first beta-quality Docker integration and TUI workflow.

Docker integration

• Added direct Docker Engine API access through /var/run/docker.sock.
• Added startup Docker preflight using GET /_ping before launching the TUI.
• Added synchronous initial container and image loading.
• Added asynchronous cache refreshes after mutations and interactive sessions.
• Preserved cached state when a refresh fails.
• Added structured container/image JSON mapping with exited-container support.

Process execution

• Replaced system() and popen() with a fork/exec process runner.
• Added captured stdout/stderr and inherited terminal I/O modes.
• Kept direct CLI execution for interactive terminal handoffs.

Reliability

• Added HTTP response parsing for Content-Length, chunked transfer, and bodyless responses.
• Added robust handling for Docker 204 and idempotent 304 responses.
• Added tri-state stop polling: stopped, running, and unknown.
• Added bounded stop retries after transport timeouts.
• Stop completion now refreshes cached state before showing the result modal.

TUI

• Replaced the persistent status panel with a centered actions panel.
• Added busy-operation modals with spinner feedback.
• Blocked input during long-running Docker operations.
• Added structured, scrollable container and image list dialogs.

Tests

• Added HTTP response parser tests.
• Added container JSON mapping tests.
• Added operation-state tests.
• Added stop polling and timeout-sequence regression tests.