self: add lock command

src/poetry/console/application.py

@@ -85,6 +85,7 @@ COMMANDS = [
     # Self commands
     "self add",
     "self install",
+    "self lock",
     "self remove",
     "self update",
     "self show",

src/poetry/console/commands/self/lock.py

+from __future__ import annotations
+
+from poetry.console.commands.lock import LockCommand
+from poetry.console.commands.self.self_command import SelfCommand
+
+
+class SelfLockCommand(SelfCommand, LockCommand):
+    name = "self lock"
+    description = "Lock the Poetry installation's system requirements."
+    help = f"""\
+The <c1>self lock</c1> command reads this Poetry installation's system requirements as \
+specified in the <comment>{SelfCommand.get_default_system_pyproject_file()}</> file.
+
+The system dependencies are locked in the <comment>\
+{SelfCommand.get_default_system_pyproject_file().parent.joinpath("poetry.lock")}</> \
+file.
+"""