From 8b986888a9ba5567803fc0d5fd0e6ddfc904e7a0 Mon Sep 17 00:00:00 2001
From: ed <s@ocv.me>
Date: Fri, 24 Apr 2026 20:09:52 +0000
Subject: [PATCH] logrotate-counter format

---
 README.md             |  1 +
 copyparty/__main__.py | 18 ++++++++++++++++++
 copyparty/svchub.py   | 31 +++++++++++++++++++++++--------
 3 files changed, 42 insertions(+), 8 deletions(-)

diff --git a/README.md b/README.md
index 3e459bf1..4277f9b5 100644
--- a/README.md
+++ b/README.md
@@ -1360,6 +1360,7 @@ serverlog is sent to stdout by default  (but logging to a file is also possible)
 * [-q](https://copyparty.eu/cli/#g-q) disables logging to stdout, and may improve performance a little bit
   * combine it with `-lo logfolder/cpp-%Y-%m-%d.txt` to log to a file instead
   * the `%Y-%m-%d` makes it create a new logfile every day, with the date as filename
+  * global-option [--rlo](https://copyparty.eu/cli/#rlo-help-page) decides what happens if the filename is taken
 * `-lo whatever.txt` can be used without `-q` to log to both at the same time
   * by default, the logfile will have colors if the terminal does (usually the case)
   * use the [textfile-viewer](https://github.com/user-attachments/assets/8a828947-2fae-4df9-bd2a-3de46f42d478) or `less -R` in a terminal to see colors correctly
diff --git a/copyparty/__main__.py b/copyparty/__main__.py
index 36ab35c7..9e9f13f4 100644
--- a/copyparty/__main__.py
+++ b/copyparty/__main__.py
@@ -1020,6 +1020,23 @@ def get_sects():
             """
             ),
         ],
+        [
+            "rlo",
+            "logrotate format",
+            dedent(
+                """
+            a logrotate-counter is added if the logfile filename is taken;
+            by default at the end, unless \033[32m%R\033[0m is somewhere in the \033[36m-lo\033[0m pattern,
+            for example:  -lo /var/log/cpp/%Y-%m-%d%R.txt
+
+            \033[36m--rlo\033[0m configures the logrotate format; examples:
+            .1   = when necessary, append a dot followed by a single digit
+            .1!  = counter is always added, even when not necessary
+            -3   = a hyphen followed by three-digit counter
+            (blank) = disable counter; overwrite existing logfile
+            """
+            ),
+        ],
         [
             "ls",
             "volume inspection",
@@ -1681,6 +1698,7 @@ def add_logging(ap):
     ap2.add_argument("-q", action="store_true", help="quiet; disable most STDOUT messages")
     ap2.add_argument("-lo", metavar="PATH", type=u, default="", help="logfile; use .txt for plaintext or .xz for compressed. Example: \033[32mcpp-%%Y-%%m%%d-%%H%%M%%S.txt.xz\033[0m (NB: some errors may appear on STDOUT only)")
     ap2.add_argument("--flo", metavar="N", type=int, default=1, help="log format for \033[33m-lo\033[0m; [\033[32m1\033[0m]=classic/colors, [\033[32m2\033[0m]=no-color")
+    ap2.add_argument("--rlo", metavar="TXT", type=u, default=".1", help="logrotate counter format; see \033[33m--help-rlo\033[0m")
     ap2.add_argument("--no-ansi", action="store_true", default=not VT100, help="disable colors; same as environment-variable NO_COLOR")
     ap2.add_argument("--ansi", action="store_true", help="force colors; overrides environment-variable NO_COLOR")
     ap2.add_argument("--no-logflush", action="store_true", help="don't flush the logfile after each write; tiny bit faster")
diff --git a/copyparty/svchub.py b/copyparty/svchub.py
index 939bff9a..fc0a9db9 100644
--- a/copyparty/svchub.py
+++ b/copyparty/svchub.py
@@ -209,7 +209,20 @@ class SvcHub(object):
         else:
             self.log = self._log_enabled
 
+        self.lo1 = self.lo2 = ""
         if args.lo:
+            if "%" in args.lo and "%R" not in args.lo:
+                args.lo += "%R"
+            if not args.rlo:
+                args.lo = args.lo.replace("%R", "")
+            try:
+                self.lo1, self.lo2 = args.lo.split("%R")
+            except:
+                self.lo1 = args.lo
+            try:
+                self.rot_fmt = "%%s%s%%0%sd%s" % (args.rlo[:1], args.rlo[1:2], self.lo2)
+            except:
+                self.rot_fmt = "%s.%d"
             self._setup_logfile()
 
         LOG[0] = self.log
@@ -1360,7 +1373,7 @@ class SvcHub(object):
 
     def _logname(self) -> str:
         dt = datetime.now(self.tz)
-        fn = str(self.args.lo)
+        fn = str(self.lo1)
         for fs in "YmdHMS":
             fs = "%" + fs
             if fs in fn:
@@ -1369,15 +1382,17 @@ class SvcHub(object):
         return fn
 
     def _setup_logfile(self) -> None:
-        base_fn = fn = sel_fn = self._logname()
-        do_xz = fn.lower().endswith(".xz")
-        if fn != self.args.lo:
-            ctr = 0
+        base_fn = fn = self._logname()
+        sel_fn = fn + self.lo2
+        do_xz = sel_fn.lower().endswith(".xz")
+        if "%R" in self.args.lo:
             # yup this is a race; if started sufficiently concurrently, two
             # copyparties can grab the same logfile (considered and ignored)
-            while os.path.exists(sel_fn):
-                ctr += 1
-                sel_fn = "{}.{}".format(fn, ctr)
+            for n in range(9999):
+                if n or "!" in self.args.rlo:
+                    sel_fn = self.rot_fmt % (fn, n)
+                if not os.path.exists(sel_fn):
+                    break
 
         fn = sel_fn
         try: