We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
CheckUpdates widget swallows crashes and shows as no updates
As per title, it's not clear if the check update command is working as any error in the command results in the widget treating it as no updates. 

This makes debugging impossible.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `libqtile/widget/check_updates.py`
Content:
```
1 # Copyright (c) 2015 Ali Mousavi
2 #
3 # Permission is hereby granted, free of charge, to any person obtaining a copy
4 # of this software and associated documentation files (the "Software"), to deal
5 # in the Software without restriction, including without limitation the rights
6 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 # copies of the Software, and to permit persons to whom the Software is
8 # furnished to do so, subject to the following conditions:
9 #
10 # The above copyright notice and this permission notice shall be included in
11 # all copies or substantial portions of the Software.
12 #
13 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
19 # SOFTWARE.
20 
21 import os
22 from subprocess import CalledProcessError, Popen
23 
24 from libqtile.log_utils import logger
25 from libqtile.widget import base
26 
27 
28 class CheckUpdates(base.ThreadPoolText):
29     """Shows number of pending updates in different unix systems"""
30 
31     defaults = [
32         ("distro", "Arch", "Name of your distribution"),
33         (
34             "custom_command",
35             None,
36             "Custom shell command for checking updates (counts the lines of the output)",
37         ),
38         (
39             "custom_command_modify",
40             (lambda x: x),
41             "Lambda function to modify line count from custom_command",
42         ),
43         ("update_interval", 60, "Update interval in seconds."),
44         ("execute", None, "Command to execute on click"),
45         ("display_format", "Updates: {updates}", "Display format if updates available"),
46         ("colour_no_updates", "ffffff", "Colour when there's no updates."),
47         ("colour_have_updates", "ffffff", "Colour when there are updates."),
48         ("restart_indicator", "", "Indicator to represent reboot is required. (Ubuntu only)"),
49         ("no_update_string", "", "String to display if no updates available"),
50     ]
51 
52     def __init__(self, **config):
53         base.ThreadPoolText.__init__(self, "", **config)
54         self.add_defaults(CheckUpdates.defaults)
55 
56         # Helpful to have this as a variable as we can shorten it for testing
57         self.execute_polling_interval = 1
58 
59         # format: "Distro": ("cmd", "number of lines to subtract from output")
60         self.cmd_dict = {
61             "Arch": ("pacman -Qu", 0),
62             "Arch_checkupdates": ("checkupdates", 0),
63             "Arch_Sup": ("pacman -Sup", 0),
64             "Arch_paru": ("paru -Qu", 0),
65             "Arch_paru_Sup": ("paru -Sup", 0),
66             "Arch_yay": ("yay -Qu", 0),
67             "Debian": ("apt-show-versions -u -b", 0),
68             "Gentoo_eix": ("EIX_LIMIT=0 eix -u# --world", 0),
69             "Ubuntu": ("aptitude search ~U", 0),
70             "Fedora": ("dnf list updates -q", 1),
71             "FreeBSD": ("pkg_version -I -l '<'", 0),
72             "Mandriva": ("urpmq --auto-select", 0),
73         }
74 
75         if self.custom_command:
76             # Use custom_command
77             self.cmd = self.custom_command
78 
79         else:
80             # Check if distro name is valid.
81             try:
82                 self.cmd = self.cmd_dict[self.distro][0]
83                 self.custom_command_modify = lambda x: x - self.cmd_dict[self.distro][1]
84             except KeyError:
85                 distros = sorted(self.cmd_dict.keys())
86                 logger.error(
87                     self.distro
88                     + " is not a valid distro name. "
89                     + "Use one of the list: "
90                     + str(distros)
91                     + "."
92                 )
93                 self.cmd = None
94 
95         if self.execute:
96             self.add_callbacks({"Button1": self.do_execute})
97 
98     def _check_updates(self):
99         # type: () -> str
100         try:
101             updates = self.call_process(self.cmd, shell=True)
102         except CalledProcessError:
103             updates = ""
104         num_updates = self.custom_command_modify(len(updates.splitlines()))
105 
106         if num_updates < 0:
107             num_updates = 0
108         if num_updates == 0:
109             self.layout.colour = self.colour_no_updates
110             return self.no_update_string
111         num_updates = str(num_updates)
112 
113         if self.restart_indicator and os.path.exists("/var/run/reboot-required"):
114             num_updates += self.restart_indicator
115 
116         self.layout.colour = self.colour_have_updates
117         return self.display_format.format(**{"updates": num_updates})
118 
119     def poll(self):
120         # type: () -> str
121         if not self.cmd:
122             return "N/A"
123         return self._check_updates()
124 
125     def do_execute(self):
126         self._process = Popen(self.execute, shell=True)
127         self.timeout_add(self.execute_polling_interval, self._refresh_count)
128 
129     def _refresh_count(self):
130         if self._process.poll() is None:
131             self.timeout_add(self.execute_polling_interval, self._refresh_count)
132 
133         else:
134             self.timer_setup()
135
```
--- 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()

```

diff --git a/libqtile/widget/check_updates.py b/libqtile/widget/check_updates.py
--- a/libqtile/widget/check_updates.py
+++ b/libqtile/widget/check_updates.py
@@ -26,7 +26,21 @@
 
 
 class CheckUpdates(base.ThreadPoolText):
-    """Shows number of pending updates in different unix systems"""
+    """
+    Shows number of pending updates in different unix systems.
+
+    .. note::
+
+        It is common for package managers to return a non-zero code when there are no
+        updates. As a result, the widget will treat *any* error as if there are no updates.
+        If you are using a custom commmand/script, you should therefore ensure that it
+        returns zero when it completes if you wish to see the output of your command.
+
+        In addition, as no errors are recorded to the log, if the widget is showing no
+        updates and you believe that to be incorrect, you should run the appropriate
+        command in a terminal to view any error messages.
+
+    """
 
     defaults = [
         ("distro", "Arch", "Name of your distribution"),

{"golden_diff": "diff --git a/libqtile/widget/check_updates.py b/libqtile/widget/check_updates.py\n--- a/libqtile/widget/check_updates.py\n+++ b/libqtile/widget/check_updates.py\n@@ -26,7 +26,21 @@\n \n \n class CheckUpdates(base.ThreadPoolText):\n-    \"\"\"Shows number of pending updates in different unix systems\"\"\"\n+    \"\"\"\n+    Shows number of pending updates in different unix systems.\n+\n+    .. note::\n+\n+        It is common for package managers to return a non-zero code when there are no\n+        updates. As a result, the widget will treat *any* error as if there are no updates.\n+        If you are using a custom commmand/script, you should therefore ensure that it\n+        returns zero when it completes if you wish to see the output of your command.\n+\n+        In addition, as no errors are recorded to the log, if the widget is showing no\n+        updates and you believe that to be incorrect, you should run the appropriate\n+        command in a terminal to view any error messages.\n+\n+    \"\"\"\n \n     defaults = [\n         (\"distro\", \"Arch\", \"Name of your distribution\"),\n", "issue": "CheckUpdates widget swallows crashes and shows as no updates\nAs per title, it's not clear if the check update command is working as any error in the command results in the widget treating it as no updates. \r\n\r\nThis makes debugging impossible.\n", "before_files": [{"content": "# Copyright (c) 2015 Ali Mousavi\n#\n# Permission is hereby granted, free of charge, to any person obtaining a copy\n# of this software and associated documentation files (the \"Software\"), to deal\n# in the Software without restriction, including without limitation the rights\n# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n# copies of the Software, and to permit persons to whom the Software is\n# furnished to do so, subject to the following conditions:\n#\n# The above copyright notice and this permission notice shall be included in\n# all copies or substantial portions of the Software.\n#\n# THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\n# SOFTWARE.\n\nimport os\nfrom subprocess import CalledProcessError, Popen\n\nfrom libqtile.log_utils import logger\nfrom libqtile.widget import base\n\n\nclass CheckUpdates(base.ThreadPoolText):\n    \"\"\"Shows number of pending updates in different unix systems\"\"\"\n\n    defaults = [\n        (\"distro\", \"Arch\", \"Name of your distribution\"),\n        (\n            \"custom_command\",\n            None,\n            \"Custom shell command for checking updates (counts the lines of the output)\",\n        ),\n        (\n            \"custom_command_modify\",\n            (lambda x: x),\n            \"Lambda function to modify line count from custom_command\",\n        ),\n        (\"update_interval\", 60, \"Update interval in seconds.\"),\n        (\"execute\", None, \"Command to execute on click\"),\n        (\"display_format\", \"Updates: {updates}\", \"Display format if updates available\"),\n        (\"colour_no_updates\", \"ffffff\", \"Colour when there's no updates.\"),\n        (\"colour_have_updates\", \"ffffff\", \"Colour when there are updates.\"),\n        (\"restart_indicator\", \"\", \"Indicator to represent reboot is required. (Ubuntu only)\"),\n        (\"no_update_string\", \"\", \"String to display if no updates available\"),\n    ]\n\n    def __init__(self, **config):\n        base.ThreadPoolText.__init__(self, \"\", **config)\n        self.add_defaults(CheckUpdates.defaults)\n\n        # Helpful to have this as a variable as we can shorten it for testing\n        self.execute_polling_interval = 1\n\n        # format: \"Distro\": (\"cmd\", \"number of lines to subtract from output\")\n        self.cmd_dict = {\n            \"Arch\": (\"pacman -Qu\", 0),\n            \"Arch_checkupdates\": (\"checkupdates\", 0),\n            \"Arch_Sup\": (\"pacman -Sup\", 0),\n            \"Arch_paru\": (\"paru -Qu\", 0),\n            \"Arch_paru_Sup\": (\"paru -Sup\", 0),\n            \"Arch_yay\": (\"yay -Qu\", 0),\n            \"Debian\": (\"apt-show-versions -u -b\", 0),\n            \"Gentoo_eix\": (\"EIX_LIMIT=0 eix -u# --world\", 0),\n            \"Ubuntu\": (\"aptitude search ~U\", 0),\n            \"Fedora\": (\"dnf list updates -q\", 1),\n            \"FreeBSD\": (\"pkg_version -I -l '<'\", 0),\n            \"Mandriva\": (\"urpmq --auto-select\", 0),\n        }\n\n        if self.custom_command:\n            # Use custom_command\n            self.cmd = self.custom_command\n\n        else:\n            # Check if distro name is valid.\n            try:\n                self.cmd = self.cmd_dict[self.distro][0]\n                self.custom_command_modify = lambda x: x - self.cmd_dict[self.distro][1]\n            except KeyError:\n                distros = sorted(self.cmd_dict.keys())\n                logger.error(\n                    self.distro\n                    + \" is not a valid distro name. \"\n                    + \"Use one of the list: \"\n                    + str(distros)\n                    + \".\"\n                )\n                self.cmd = None\n\n        if self.execute:\n            self.add_callbacks({\"Button1\": self.do_execute})\n\n    def _check_updates(self):\n        # type: () -> str\n        try:\n            updates = self.call_process(self.cmd, shell=True)\n        except CalledProcessError:\n            updates = \"\"\n        num_updates = self.custom_command_modify(len(updates.splitlines()))\n\n        if num_updates < 0:\n            num_updates = 0\n        if num_updates == 0:\n            self.layout.colour = self.colour_no_updates\n            return self.no_update_string\n        num_updates = str(num_updates)\n\n        if self.restart_indicator and os.path.exists(\"/var/run/reboot-required\"):\n            num_updates += self.restart_indicator\n\n        self.layout.colour = self.colour_have_updates\n        return self.display_format.format(**{\"updates\": num_updates})\n\n    def poll(self):\n        # type: () -> str\n        if not self.cmd:\n            return \"N/A\"\n        return self._check_updates()\n\n    def do_execute(self):\n        self._process = Popen(self.execute, shell=True)\n        self.timeout_add(self.execute_polling_interval, self._refresh_count)\n\n    def _refresh_count(self):\n        if self._process.poll() is None:\n            self.timeout_add(self.execute_polling_interval, self._refresh_count)\n\n        else:\n            self.timer_setup()\n", "path": "libqtile/widget/check_updates.py"}], "after_files": [{"content": "# Copyright (c) 2015 Ali Mousavi\n#\n# Permission is hereby granted, free of charge, to any person obtaining a copy\n# of this software and associated documentation files (the \"Software\"), to deal\n# in the Software without restriction, including without limitation the rights\n# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n# copies of the Software, and to permit persons to whom the Software is\n# furnished to do so, subject to the following conditions:\n#\n# The above copyright notice and this permission notice shall be included in\n# all copies or substantial portions of the Software.\n#\n# THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\n# SOFTWARE.\n\nimport os\nfrom subprocess import CalledProcessError, Popen\n\nfrom libqtile.log_utils import logger\nfrom libqtile.widget import base\n\n\nclass CheckUpdates(base.ThreadPoolText):\n    \"\"\"\n    Shows number of pending updates in different unix systems.\n\n    .. note::\n\n        It is common for package managers to return a non-zero code when there are no\n        updates. As a result, the widget will treat *any* error as if there are no updates.\n        If you are using a custom commmand/script, you should therefore ensure that it\n        returns zero when it completes if you wish to see the output of your command.\n\n        In addition, as no errors are recorded to the log, if the widget is showing no\n        updates and you believe that to be incorrect, you should run the appropriate\n        command in a terminal to view any error messages.\n\n    \"\"\"\n\n    defaults = [\n        (\"distro\", \"Arch\", \"Name of your distribution\"),\n        (\n            \"custom_command\",\n            None,\n            \"Custom shell command for checking updates (counts the lines of the output)\",\n        ),\n        (\n            \"custom_command_modify\",\n            (lambda x: x),\n            \"Lambda function to modify line count from custom_command\",\n        ),\n        (\"update_interval\", 60, \"Update interval in seconds.\"),\n        (\"execute\", None, \"Command to execute on click\"),\n        (\"display_format\", \"Updates: {updates}\", \"Display format if updates available\"),\n        (\"colour_no_updates\", \"ffffff\", \"Colour when there's no updates.\"),\n        (\"colour_have_updates\", \"ffffff\", \"Colour when there are updates.\"),\n        (\"restart_indicator\", \"\", \"Indicator to represent reboot is required. (Ubuntu only)\"),\n        (\"no_update_string\", \"\", \"String to display if no updates available\"),\n    ]\n\n    def __init__(self, **config):\n        base.ThreadPoolText.__init__(self, \"\", **config)\n        self.add_defaults(CheckUpdates.defaults)\n\n        # Helpful to have this as a variable as we can shorten it for testing\n        self.execute_polling_interval = 1\n\n        # format: \"Distro\": (\"cmd\", \"number of lines to subtract from output\")\n        self.cmd_dict = {\n            \"Arch\": (\"pacman -Qu\", 0),\n            \"Arch_checkupdates\": (\"checkupdates\", 0),\n            \"Arch_Sup\": (\"pacman -Sup\", 0),\n            \"Arch_paru\": (\"paru -Qu\", 0),\n            \"Arch_paru_Sup\": (\"paru -Sup\", 0),\n            \"Arch_yay\": (\"yay -Qu\", 0),\n            \"Debian\": (\"apt-show-versions -u -b\", 0),\n            \"Gentoo_eix\": (\"EIX_LIMIT=0 eix -u# --world\", 0),\n            \"Ubuntu\": (\"aptitude search ~U\", 0),\n            \"Fedora\": (\"dnf list updates -q\", 1),\n            \"FreeBSD\": (\"pkg_version -I -l '<'\", 0),\n            \"Mandriva\": (\"urpmq --auto-select\", 0),\n        }\n\n        if self.custom_command:\n            # Use custom_command\n            self.cmd = self.custom_command\n\n        else:\n            # Check if distro name is valid.\n            try:\n                self.cmd = self.cmd_dict[self.distro][0]\n                self.custom_command_modify = lambda x: x - self.cmd_dict[self.distro][1]\n            except KeyError:\n                distros = sorted(self.cmd_dict.keys())\n                logger.error(\n                    self.distro\n                    + \" is not a valid distro name. \"\n                    + \"Use one of the list: \"\n                    + str(distros)\n                    + \".\"\n                )\n                self.cmd = None\n\n        if self.execute:\n            self.add_callbacks({\"Button1\": self.do_execute})\n\n    def _check_updates(self):\n        # type: () -> str\n        try:\n            updates = self.call_process(self.cmd, shell=True)\n        except CalledProcessError:\n            updates = \"\"\n        num_updates = self.custom_command_modify(len(updates.splitlines()))\n\n        if num_updates < 0:\n            num_updates = 0\n        if num_updates == 0:\n            self.layout.colour = self.colour_no_updates\n            return self.no_update_string\n        num_updates = str(num_updates)\n\n        if self.restart_indicator and os.path.exists(\"/var/run/reboot-required\"):\n            num_updates += self.restart_indicator\n\n        self.layout.colour = self.colour_have_updates\n        return self.display_format.format(**{\"updates\": num_updates})\n\n    def poll(self):\n        # type: () -> str\n        if not self.cmd:\n            return \"N/A\"\n        return self._check_updates()\n\n    def do_execute(self):\n        self._process = Popen(self.execute, shell=True)\n        self.timeout_add(self.execute_polling_interval, self._refresh_count)\n\n    def _refresh_count(self):\n        if self._process.poll() is None:\n            self.timeout_add(self.execute_polling_interval, self._refresh_count)\n\n        else:\n            self.timer_setup()\n", "path": "libqtile/widget/check_updates.py"}]}