Layers that already exist locally should not count towards download
progress since there's nothing to download for them. Only layers that
need pulling are included in the progress calculation.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Refactor Docker image pull progress to use a simpler count-based approach
where each layer contributes equally (100% / total_layers) regardless of
size. This replaces the previous size-weighted calculation that was
susceptible to progress regression.
The core issue was that Docker rate-limits concurrent downloads (~3 at a
time) and reports layer sizes only when downloading starts. With size-
weighted progress, large layers appearing late would cause progress to
drop dramatically (e.g., 59% -> 29%) as the total size increased.
The new approach:
- Each layer contributes equally to overall progress
- Per-layer progress: 70% download weight, 30% extraction weight
- Progress only starts after first "Downloading" event (when layer
count is known)
- Always caps at 99% - job completion handles final 100%
This simplifies the code by moving progress tracking to a dedicated
module (pull_progress.py) and removing complex size-based scaling logic
that tried to account for unknown layer sizes.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
