v0.6.3

Breaking Changes

Bundle format changed from base64-encoded to makeself-style

• Old bundles (v0.6.2 and earlier) cannot be loaded by v0.6.3+
• New bundles cannot be loaded by v0.6.2 and earlier

Major Improvements

Size Reduction (25% smaller bundles)

• Eliminates 33% base64 encoding overhead
• postgres:15: 155MB (was ~207MB with base64)
• alpine:latest: 9.7MB (was ~13MB with base64)

Performance Improvements

• Zero encoding/decoding time (saves 2-3 seconds per operation)
• Streaming data processing with constant ~50MB memory usage
• No more loading entire images into memory

Bundle Format (Makeself-Style)

• Shell script header + __PAYLOAD_BELOW__ marker + raw tar.gz payload
• Uses standard tail and tar commands for extraction
• No special tools required on target system

New Features

• Added -o shorthand for --out-dir flag
• Progress logging during bundle creation:
  • "Creating payload archive..."
  • "Writing self-extracting header..."
  • "Appending binary payload (XXX MB)..."
  • "Bundle created successfully (XXX MB total)"

Technical Details

• Removed base64 encoding/decoding logic completely
• Bundle payload structure: imgcd binary + image.tar.gz (no base64)
• Self-extractor template now embedded in binary using go:embed
• Verified incremental export functionality works correctly with new format

Test Results

Incremental export verification (postgres:15):

• Full export: 155MB (14 layers)
• Incremental (--since postgres:14): 127MB (13 layers)
• Space savings: 28MB (18%) ✓

Large image example (vllm):

• Full export: 11.6GB (33 layers)
• Incremental (v0.11.0 --since v0.10.1.1): 6.8GB (22 layers)
• Space savings: 4.8GB (41.3%) ✓