prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  command to check lock file
  <!-- Checked checkbox should look like this: [x] -->
  - [X] I have searched the [issues](https://github.com/sdispater/poetry/issues) of this repo and believe that this is not a duplicate.
  
  ## Issue
  
  Would it be possible to add a `poetry check` command (oh, I see you'e used that already, maybe the command could be extended or have a `poetry lock --check`?) that will return zero if the current poetry.lock is both correct w.r.t. the pyproject.toml (ie: packages match) *and* that it matches the output of `poetry lock`.
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `poetry/console/commands/lock.py`
  Content:
  ```
  1 from cleo.helpers import option
  2 
  3 from .installer_command import InstallerCommand
  4 
  5 
  6 class LockCommand(InstallerCommand):
  7 
  8     name = "lock"
  9     description = "Locks the project dependencies."
  10 
  11     options = [
  12         option(
  13             "no-update", None, "Do not update locked versions, only refresh lock file."
  14         ),
  15     ]
  16 
  17     help = """
  18 The <info>lock</info> command reads the <comment>pyproject.toml</> file from the
  19 current directory, processes it, and locks the dependencies in the <comment>poetry.lock</>
  20 file.
  21 
  22 <info>poetry lock</info>
  23 """
  24 
  25     loggers = ["poetry.repositories.pypi_repository"]
  26 
  27     def handle(self) -> int:
  28         self._installer.use_executor(
  29             self.poetry.config.get("experimental.new-installer", False)
  30         )
  31 
  32         self._installer.lock(update=not self.option("no-update"))
  33 
  34         return self._installer.run()
  35
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/poetry/console/commands/lock.py b/poetry/console/commands/lock.py
  --- a/poetry/console/commands/lock.py
  +++ b/poetry/console/commands/lock.py
  @@ -12,6 +12,12 @@
           option(
               "no-update", None, "Do not update locked versions, only refresh lock file."
           ),
  +        option(
  +            "check",
  +            None,
  +            "Check that the <comment>poetry.lock</> file corresponds to the current version "
  +            "of <comment>pyproject.toml</>.",
  +        ),
       ]
   
       help = """
  @@ -29,6 +35,13 @@
               self.poetry.config.get("experimental.new-installer", False)
           )
   
  +        if self.option("check"):
  +            return (
  +                0
  +                if self.poetry.locker.is_locked() and self.poetry.locker.is_fresh()
  +                else 1
  +            )
  +
           self._installer.lock(update=not self.option("no-update"))
   
           return self._installer.run()
  
verification_info: {"golden_diff": "diff --git a/poetry/console/commands/lock.py b/poetry/console/commands/lock.py\n--- a/poetry/console/commands/lock.py\n+++ b/poetry/console/commands/lock.py\n@@ -12,6 +12,12 @@\n         option(\n             \"no-update\", None, \"Do not update locked versions, only refresh lock file.\"\n         ),\n+        option(\n+            \"check\",\n+            None,\n+            \"Check that the <comment>poetry.lock</> file corresponds to the current version \"\n+            \"of <comment>pyproject.toml</>.\",\n+        ),\n     ]\n \n     help = \"\"\"\n@@ -29,6 +35,13 @@\n             self.poetry.config.get(\"experimental.new-installer\", False)\n         )\n \n+        if self.option(\"check\"):\n+            return (\n+                0\n+                if self.poetry.locker.is_locked() and self.poetry.locker.is_fresh()\n+                else 1\n+            )\n+\n         self._installer.lock(update=not self.option(\"no-update\"))\n \n         return self._installer.run()\n", "issue": "command to check lock file\n<!-- Checked checkbox should look like this: [x] -->\r\n- [X] I have searched the [issues](https://github.com/sdispater/poetry/issues) of this repo and believe that this is not a duplicate.\r\n\r\n## Issue\r\n\r\nWould it be possible to add a `poetry check` command (oh, I see you'e used that already, maybe the command could be extended or have a `poetry lock --check`?) that will return zero if the current poetry.lock is both correct w.r.t. the pyproject.toml (ie: packages match) *and* that it matches the output of `poetry lock`.\r\n\n", "before_files": [{"content": "from cleo.helpers import option\n\nfrom .installer_command import InstallerCommand\n\n\nclass LockCommand(InstallerCommand):\n\n    name = \"lock\"\n    description = \"Locks the project dependencies.\"\n\n    options = [\n        option(\n            \"no-update\", None, \"Do not update locked versions, only refresh lock file.\"\n        ),\n    ]\n\n    help = \"\"\"\nThe <info>lock</info> command reads the <comment>pyproject.toml</> file from the\ncurrent directory, processes it, and locks the dependencies in the <comment>poetry.lock</>\nfile.\n\n<info>poetry lock</info>\n\"\"\"\n\n    loggers = [\"poetry.repositories.pypi_repository\"]\n\n    def handle(self) -> int:\n        self._installer.use_executor(\n            self.poetry.config.get(\"experimental.new-installer\", False)\n        )\n\n        self._installer.lock(update=not self.option(\"no-update\"))\n\n        return self._installer.run()\n", "path": "poetry/console/commands/lock.py"}], "after_files": [{"content": "from cleo.helpers import option\n\nfrom .installer_command import InstallerCommand\n\n\nclass LockCommand(InstallerCommand):\n\n    name = \"lock\"\n    description = \"Locks the project dependencies.\"\n\n    options = [\n        option(\n            \"no-update\", None, \"Do not update locked versions, only refresh lock file.\"\n        ),\n        option(\n            \"check\",\n            None,\n            \"Check that the <comment>poetry.lock</> file corresponds to the current version \"\n            \"of <comment>pyproject.toml</>.\",\n        ),\n    ]\n\n    help = \"\"\"\nThe <info>lock</info> command reads the <comment>pyproject.toml</> file from the\ncurrent directory, processes it, and locks the dependencies in the <comment>poetry.lock</>\nfile.\n\n<info>poetry lock</info>\n\"\"\"\n\n    loggers = [\"poetry.repositories.pypi_repository\"]\n\n    def handle(self) -> int:\n        self._installer.use_executor(\n            self.poetry.config.get(\"experimental.new-installer\", False)\n        )\n\n        if self.option(\"check\"):\n            return (\n                0\n                if self.poetry.locker.is_locked() and self.poetry.locker.is_fresh()\n                else 1\n            )\n\n        self._installer.lock(update=not self.option(\"no-update\"))\n\n        return self._installer.run()\n", "path": "poetry/console/commands/lock.py"}]}