cli (base): Add instance isolation options:

- New ``-i``/``--isolation`` argument is added, it must be used before first positional
  argument (i.e., first comamnd).
- The new `entry.py` module is now the entry point, so it can set the `LIBERVIA_ISOLATION`
  environment variable before the backend read it.

libervia/cli/base.py

@@ -596,6 +596,12 @@ class LiberviaCli:
                 )
             ),
         )
+        self.parser.add_argument(
+            "-i",
+            "--isolation",
+            metavar="NAME",
+            help=("use the isolated instance NAME (must be used before the command)"),
+        )
 
     def register_output(self, type_, name, callback, description="", default=False):
         if type_ not in C.OUTPUT_TYPES:

libervia/cli/entry.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+
+# Libervia: an XMPP client
+# Copyright (C) 2009-2026 Jérôme Poisson (goffi@goffi.org)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Entry point for the Libervia CLI frontends."""
+
+import os
+import sys
+
+
+def extract_isolation_arg(argv: list[str]) -> str | None:
+    """Extract the isolation argument.
+
+    Only arguments used before the first command are considered, avoiding conflicts with
+    sub-commands.
+
+    @param argv: The command line arguments, without the program name
+    @return: The isolation name, or None if the argument is not used
+    """
+    for i, arg in enumerate(argv):
+        if arg in ("-i", "--isolation"):
+            if i + 1 >= len(argv):
+                return None
+            return argv[i + 1]
+        if arg.startswith("-i") and len(arg) > 2:
+            # combined short option, e.g. "-iname"
+            return arg[2:]
+        if arg.startswith("--isolation="):
+            return arg.split("=", 1)[1]
+        if not arg.startswith("-"):
+            # first positional argument (the command), we stop here
+            break
+    return None
+
+
+def main() -> None:
+    """Run the Libervia CLI."""
+    # The backend reads the environment variable at import time, we have to process the
+    # isolation argument here, before first "libervia.backend" import.
+    isolation = extract_isolation_arg(sys.argv[1:])
+    if isolation is not None:
+        os.environ["LIBERVIA_ISOLATION"] = isolation
+    from libervia.cli.base import LiberviaCli
+
+    LiberviaCli.run()

pyproject.toml

@@ -169,10 +169,10 @@ docs = [
 
 [project.scripts]
 # Legacy name, will be removed in future version
-jp = "libervia.cli.base:LiberviaCli.run"
-li = "libervia.cli.base:LiberviaCli.run"
+jp = "libervia.cli.entry:main"
+li = "libervia.cli.entry:main"
 libervia-backend = "libervia.backend.core.launcher:Launcher.run"
-libervia-cli = "libervia.cli.base:LiberviaCli.run"
+libervia-cli = "libervia.cli.entry:main"
 libervia-tui = "libervia.tui.base:LiberviaTUIApp.run"
 # Legacy name, will be removed in future version
 primitivus = "libervia.tui.base:LiberviaTUIApp.run"