fix(show): ensure lockfile exists

src/poetry/console/commands/show.py

@@ -130,6 +130,10 @@ def handle(self) -> Optional[int]:
         if self.option("default"):
             only_groups.append("default")
 
+        if not self.poetry.locker.is_locked():
+            self.line_error("<comment>The lock file does not exist. Locking.</comment>")
+            self.call("lock")
+
         locked_repo = self.poetry.locker.locked_repository(True)
 
         if only_groups:

tests/console/commands/test_show.py

@@ -10,6 +10,7 @@
 
 if TYPE_CHECKING:
     from cleo.testers.command_tester import CommandTester
+    from pytest_mock import MockerFixture
 
     from poetry.poetry import Poetry
     from poetry.repositories import Repository
@@ -1587,3 +1588,45 @@ def test_show_required_by_deps(
 """.splitlines()
     actual = [line.rstrip() for line in tester.io.fetch_output().splitlines()]
     assert actual == expected
+
+
+def test_show_locks_if_no_lock_file(
+    mocker: "MockerFixture",
+    tester: "CommandTester",
+    poetry: "Poetry",
+    installed: "Repository",
+):
+    call = mocker.patch("cleo.commands.command.Command.call")
+
+    poetry.package.add_dependency(Factory.create_dependency("cachy", "0.1.0"))
+    installed.add_package(get_package("cachy", "0.1.0"))
+    lock_data = {
+        "package": [
+            {
+                "name": "cachy",
+                "version": "0.1.0",
+                "description": "Cachy package",
+                "category": "main",
+                "optional": False,
+                "platform": "*",
+                "python-versions": "*",
+                "checksum": [],
+            },
+        ],
+        "metadata": {
+            "python-versions": "*",
+            "platform": "*",
+            "content-hash": "123456789",
+            "hashes": {"cachy": []},
+        },
+    }
+    call.side_effect = lambda *args, **kwargs: poetry.locker.mock_lock_data(lock_data)
+
+    assert not poetry.locker.lock.exists()
+
+    tester.execute()
+
+    assert "The lock file does not exist. Locking." in tester.io.fetch_error()
+    assert tester.io.fetch_output() == "cachy 0.1.0 Cachy package\n"
+    assert call.call_count == 1
+    assert call.call_args == [("lock",)]