option to skip database syncs entirely

copyparty/__main__.py

@@ -542,6 +542,8 @@ def run_argparse(
               \033[36mnoforget$\033[35m don't forget files when deleted from disk
               \033[36mnowal\033[35m guarantee zero dataloss on powerloss by disabling wal
               \033[36mwal\033[35m enable wal (default; overrides --no-wal)
+              \033[36mnosync\033[35m switch to unsafe mode for extremely fast uploads
+              \033[36msync\033[35m normal corruption-protected db config
               \033[36mxlink$\033[35m cross-volume dupe detection / linking
               \033[36mxdev\033[35m do not descend into other filesystems
               \033[36mxvol\033[35m skip symlinks leaving the volume root
@@ -816,6 +818,7 @@ def run_argparse(
     ap2.add_argument("--no-dhash", action="store_true", help="disable rescan acceleration; do full database integrity check -- makes the db ~5%% smaller and bootup/rescans 3~10x slower")
     ap2.add_argument("--no-forget", action="store_true", help="never forget indexed files, even when deleted from disk -- makes it impossible to ever upload the same file twice (volflag=noforget)")
     ap2.add_argument("--no-wal", action="store_true", help="1%% faster searches, more reliable upload performance, and slightly more resistant to dataloss, but makes uploads up to 2x slower (volflag=nowal)")
+    ap2.add_argument("--no-sync", action="store_true", help="make uploads extremely fast, but removes corruption protection -- if the OS crashes, you might lose the db (volflag=nosync)")
     ap2.add_argument("--xlink", action="store_true", help="on upload: check all volumes for dupes, not just the target volume (volflag=xlink)")
     ap2.add_argument("--xdev", action="store_true", help="do not descend into other filesystems (symlink or bind-mount to another HDD, ...) (volflag=xdev)")
     ap2.add_argument("--xvol", action="store_true", help="skip symlinks leaving the volume root (volflag=xvol)")

copyparty/authsrv.py

@@ -1124,6 +1124,7 @@ class AuthSrv(object):
                 ("no_forget", "noforget"),
                 ("no_dupe", "nodupe"),
                 ("no_wal", "nowal"),
+                ("no_sync", "nosync"),
                 ("magic", "magic"),
                 ("xlink", "xlink"),
             ):

copyparty/up2k.py

@@ -666,6 +666,9 @@ class Up2k(object):
             except:
                 pass
 
+            if "nosync" in flags:
+                cur.execute("pragma synchronous=0")
+
             return cur, db_path
         except:
             msg = "cannot use database at [{}]:\n{}"

copyparty/util.py

@@ -202,7 +202,7 @@ if ANYWIN:
 UNPLICATIONS = [["no_dav", "daw"]]
 
 
-DROPLICATIONS = [["wal", "nowal"]]
+DROPLICATIONS = [["wal", "nowal"], ["sync", "nosync"]]
 
 
 MIMES = {