Add debugging output to show wheel directory structures

Add debugging output to show the directory structure of input and output
wheels for troubleshooting. This will help diagnose issues with the
wheel merge process.

- Use Python's zipfile module (standard library) to list wheel contents
- Add debugging output showing cuda/core/ directory structure for:
  * Each input wheel before merging
  * The output merged wheel after merging
- Format output similar to unzip -l for readability
- Filter output to show only cuda/core/ entries

Author: rwgk

ci/tools/merge_cuda_core_wheels.py

@@ -25,6 +25,7 @@
 import subprocess
 import sys
 import tempfile
+import zipfile
 from pathlib import Path
 from typing import List
 
@@ -54,6 +55,31 @@ def merge_wheels(wheels: List[Path], output_dir: Path) -> Path:
     if len(wheels) == 1:
         raise RuntimeError("only one wheel is provided, nothing to merge")
 
+    # Debug: Show directory structure of input wheels
+    print("\n=== Input wheel directory structures ===", file=sys.stderr)
+    for i, wheel in enumerate(wheels):
+        print(f"\n--- Input wheel {i + 1}: {wheel.name} ---", file=sys.stderr)
+        try:
+            with zipfile.ZipFile(wheel, "r") as zf:
+                print(f"{'Length':>10}  {'Date':>12}  {'Time':>8}  Name", file=sys.stderr)
+                print("-" * 80, file=sys.stderr)
+                total_size = 0
+                file_count = 0
+                for name in sorted(zf.namelist()):
+                    if "cuda/core/" in name:
+                        info = zf.getinfo(name)
+                        total_size += info.file_size
+                        file_count += 1
+                        # Format similar to unzip -l output
+                        date_time = info.date_time
+                        date_str = f"{date_time[0]:04d}-{date_time[1]:02d}-{date_time[2]:02d}"
+                        time_str = f"{date_time[3]:02d}:{date_time[4]:02d}:{date_time[5]:02d}"
+                        print(f"{info.file_size:10d}  {date_str}  {time_str}  {name}", file=sys.stderr)
+                print("-" * 80, file=sys.stderr)
+                print(f"{total_size:10d}                    {file_count} files", file=sys.stderr)
+        except Exception as e:
+            print(f"Warning: Could not list wheel contents: {e}", file=sys.stderr)
+
     # Extract all wheels to temporary directories
     with tempfile.TemporaryDirectory() as temp_dir:
         temp_path = Path(temp_dir)
@@ -157,6 +183,30 @@ def merge_wheels(wheels: List[Path], output_dir: Path) -> Path:
 
         merged_wheel = output_wheels[0]
         print(f"Successfully merged wheel: {merged_wheel}", file=sys.stderr)
+
+        # Debug: Show directory structure of output wheel
+        print("\n=== Output wheel directory structure ===", file=sys.stderr)
+        try:
+            with zipfile.ZipFile(merged_wheel, "r") as zf:
+                print(f"{'Length':>10}  {'Date':>12}  {'Time':>8}  Name", file=sys.stderr)
+                print("-" * 80, file=sys.stderr)
+                total_size = 0
+                file_count = 0
+                for name in sorted(zf.namelist()):
+                    if "cuda/core/" in name:
+                        info = zf.getinfo(name)
+                        total_size += info.file_size
+                        file_count += 1
+                        # Format similar to unzip -l output
+                        date_time = info.date_time
+                        date_str = f"{date_time[0]:04d}-{date_time[1]:02d}-{date_time[2]:02d}"
+                        time_str = f"{date_time[3]:02d}:{date_time[4]:02d}:{date_time[5]:02d}"
+                        print(f"{info.file_size:10d}  {date_str}  {time_str}  {name}", file=sys.stderr)
+                print("-" * 80, file=sys.stderr)
+                print(f"{total_size:10d}                    {file_count} files", file=sys.stderr)
+        except Exception as e:
+            print(f"Warning: Could not list wheel contents: {e}", file=sys.stderr)
+
         return merged_wheel