hardlink_*: add hardlink replicating scripts

hardlink_mapper.py

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+#!/usr/bin/env python3
+
+import os
+import sys
+import json
+import argparse
+
+
+# Function to get hard links between source and target directories
+def get_hard_links(source_dir, target_dir):
+    # Dictionary to store hard links
+    source_links = {}
+    target_links = {}
+
+    # Walk through the source directory to collect hard links
+    for dirpath, _, filenames in os.walk(source_dir):
+        for filename in filenames:
+            filepath = os.path.join(dirpath, filename)
+            try:
+                inode = os.stat(filepath).st_ino
+                if inode not in source_links:
+                    source_links[inode] = []
+                source_links[inode].append(filepath)
+            except FileNotFoundError:
+                continue
+
+    # Walk through the target directory to collect hard links
+    for dirpath, _, filenames in os.walk(target_dir):
+        for filename in filenames:
+            filepath = os.path.join(dirpath, filename)
+            try:
+                inode = os.stat(filepath).st_ino
+                if inode not in target_links:
+                    target_links[inode] = []
+                target_links[inode].append(filepath)
+            except FileNotFoundError:
+                continue
+
+    # Generate the list of tuples (relative_src, relative_dst)
+    hard_links = []
+    for inode, target_files in target_links.items():
+        if inode in source_links:
+            for target_file in target_files:
+                relative_target = os.path.relpath(target_file, target_dir)
+                for source_file in source_links[inode]:
+                    relative_source = os.path.relpath(source_file, source_dir)
+                    hard_links.append([relative_source, relative_target])
+
+    return hard_links
+
+
+def main():
+    # Argument parser for CLI arguments
+    parser = argparse.ArgumentParser(description="Collect hard links between source and target directories.")
+    parser.add_argument('source_dir', help="Path to the source directory")
+    parser.add_argument('target_dir', help="Path to the target directory")
+
+    args = parser.parse_args()
+
+    hard_links = get_hard_links(args.source_dir, args.target_dir)
+    print(json.dumps(hard_links, indent=2))
+
+
+if __name__ == "__main__":
+    main()