I think I'm at an 80% solution, committing up to test on linux

rdify

@@ -6,49 +6,70 @@ import os
 import shutil
 import subprocess
 import sys
+import time
 from pathlib import Path
 
 def eprint(*args, **kwargs):
     print(*args, file=sys.stderr, **kwargs)
 
-def init(target, persist):
-    target = Path(target)
-    persist = Path(persist)
-    persist.mkdir(parents=True, exist_ok=True)
-    ramdisk = Path("/dev/shm/ramdisk")
-    ramdisk.mkdir(parents=True, exist_ok=True)
-
-    full_dest_path = ramdisk.joinpath(target.name)
-    if target.is_file():
-        shutil.copy2(target, ramdisk)
-    else:
-        shutil.copytree(target, full_dest_path)
-    shutil.move(target, persist)
-
-    os.symlink(full_dest_path, target)
+class RamDiskItem():
+    def __init__(self, target, persist):
+        self.target = Path(target)
+        self.persist = Path(persist)
+        self.ramdisk = Path("/dev/shm/ramdisk")
+        self.full_rd_path = ramdisk.joinpath(target.name)
+        self.full_persist_path = persist.joinpath(target.name)
 
 
-def sync(target, persist):
-    pass
+    def init(self):
+        self.persist.mkdir(parents=True, exist_ok=True)
+        self.ramdisk.mkdir(parents=True, exist_ok=True)
 
-def loop_sync(target, persist):
-    pass
 
-def cleanup(target, persist):
-    pass
+        if target.is_file():
+            shutil.copy2(self.target, self.ramdisk)
+        else:
+            shutil.copytree(self.target, self.full_rd_path)
+        shutil.move(self.target, self.persist)
+
+        os.symlink(self.full_rd_path, self.target)
+
+
+    def sync(self):
+        # TODO: actually look at output from this...
+        subprocess.run(["rsync", "-aP", "--delete", self.full_rd_path, self.full_persist_path])
+
+    def loop_sync(self, delay):
+        while True:
+            self.sync
+            time.sleep(delay)
+
+    def cleanup(self):
+        self.sync()
+        shutil.move(self.full_persist_path, self.target.parent)
+        if self.full_rd_path.is_file():
+            self.full_rd_path.unlink()
+        else:
+            shutil.rmtree(self.full_rd_path)
+        shutil.rmtree(self.full_persist_path)
 
 
 def main():
     parser = argparse.ArgumentParser()
     # Arguments to specify the action to take
     action = parser.add_mutually_exclusive_group(required=True)
-    action.add_argument("-i", "--init", action="store_true", help="Initialize the target file/directory into ramdisk")
-    action.add_argument("-s", "--sync", action="store_true", help="Perform a single sync of the target from ramdisk to persistent storage")
-    action.add_argument("-l", "--loop-sync", type=int, help="Starts a repeating sync that loops every LOOP_SYNC seconds")
-    action.add_argument("-c", "--cleanup", action="store_true", help="clean up an existing ramdiskified target")
+    action.add_argument("-i", "--init", action="store_true",
+        help="Initialize the target file/directory into ramdisk")
+    action.add_argument("-s", "--sync", action="store_true",
+        help="Perform a single sync of the target from ramdisk to persistent storage")
+    action.add_argument("-l", "--loop_sync", type=int,
+        help="Starts a repeating sync that loops every LOOP_SYNC seconds")
+    action.add_argument("-c", "--cleanup", action="store_true",
+        help="clean up an existing ramdiskified target")
     # Arguments to specify what to act on
     parser.add_argument("target", help="The target file/directory to ramdiskify")
-    parser.add_argument("persist", nargs="?", default=".persist", help="The location to store the persistent copy while ramdiskified, defaults to '.persist'")
+    parser.add_argument("persist", nargs="?", default=".persist",
+        help="The location to store the persistent copy while ramdiskified, defaults to '.persist'")
 
     args = parser.parse_args()
 
@@ -56,14 +77,16 @@ def main():
         eprint(f"Target: {args.target} doesn't exist!")
         return
 
+    rd_item = RamDiskItem(args.target, args.persist)
+
     if args.init:
-        init(args.target, args.persist)
+        rd_item.init()
     elif args.sync:
-        sync(args.target, args.persist)
-    elif args.loop-sync:
-        loop_sync(args.target, args.persist)
+        rd_item.sync()
+    elif args.loop_sync:
+        rd_item.loop_sync(args.loop_sync)
     elif args.cleanup:
-        cleanup(args.target, args.perist)
+        rd_item.cleanup(args.target, args.perist)
     else:
         pass