Add reflink support for unlinkable files and a set of all property

files processed that can be safely skipped

requirements.txt

@@ -2,3 +2,4 @@ pytz
 python-dateutil
 PyYAML
 appdirs
+reflink

tibi_hardlinks/__init__.py

@@ -16,19 +16,24 @@ def find_all_property_files():
 
 def hardlink_all_files(files, dry=False):
     for prop_file in files:
-        backup = Backup(prop_file)
-        dest_dir = create_backup_directory_name(
-            backup.backup_info, CONFIG_DATA["customization"]["time_format"]
-        )
-        dest_dir = Path(CONFIG_DATA["output"]["output_root"]) / dest_dir
-        if dry:
-            print(f"mkdir: {dest_dir}")
-        else:
-            dest_dir.mkdir(parents=True, exist_ok=True)
-        backup.hardlink_to(dest_dir, dry)
+        try:
             already_processed = cache_manager.tibi_cache["already_processed"]
+        except KeyError:
+            already_processed = set()
             cache_manager.tibi_cache["already_processed"] = already_processed
             cache_manager.tibi_cache.sync()
+        if prop_file not in already_processed:
+            backup = Backup(prop_file)
+            dest_dir = create_backup_directory_name(
+                backup.backup_info, CONFIG_DATA["customization"]["time_format"]
+            )
+            dest_dir = Path(CONFIG_DATA["output"]["output_root"]) / dest_dir
+            if not dest_dir.exists():
+                if dry:
+                    print(f"mkdir: {dest_dir}")
+                else:
+                    dest_dir.mkdir(parents=True)
+            backup.hardlink_to(dest_dir, dry)
 
 
 def main():

tibi_hardlinks/backups.py

@@ -1,5 +1,8 @@
 from pathlib import Path
 import datetime
+import re
+
+from reflink import reflink
 
 from tibi_hardlinks.backup_parser import read_backup_properties
 from tibi_hardlinks.exceptions import ConfigurationException
@@ -99,8 +102,18 @@ class Backup:
         for filepath in self.related_files.values():
             if filepath:
                 filename = filepath.name
-                if dry:
-                    print(f'link: "{filepath}" => "{dest_dir / filename}"')
-                else:
-                    filepath.link_to(dest_dir / filename)
+                dest_path = dest_dir / filename
+                can_skip = True
+                if not dest_path.exists():
+                    can_skip = False
+                    if dry:
+                        print(f'link: "{filepath}" => "{dest_path}"')
+                    else:
+                        try:
+                            filepath.link_to(dest_path)
+                        except OSError:
+                            reflink(str(filepath), str(dest_path))
+                        except Exception:
+                            raise
+        if can_skip and not dry:
             cache_manager.tibi_cache["already_processed"].add(self.property_file)