prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Can't install new certificates with certbot-apache under Gentoo since version 0.20.0
  It seems that version 0.20.0 has a major architecture revision from 0.19.0, in particular regarding OS specific overrides. But the Gentoo overrides have a flaw when trying to install a new certificate : at one point it tries to run "apache2ctl -t -D DUMP_MODULES", which is no good at all under Gentoo because apache2ctl is a dummy script redirecting to /etc/init.d/apache2. It generates this error :
  
  `Error in checking parameter list: /etc/init.d/apache2: invalid option -- 't'`
  
  ## My operating system is (include version):
  Gentoo
  
  ## I installed Certbot with (certbot-auto, OS package manager, pip, etc):
  OS package manager (emerge) with testing (~amd64) flag
  
  ## I ran this command and it produced this output:
  ```
  certbot -d test.example.com
  Saving debug log to /var/log/letsencrypt/letsencrypt.log
  Plugins selected: Authenticator apache, Installer apache
  Obtaining a new certificate
  Performing the following challenges:
  tls-sni-01 challenge for test.example.com
  Waiting for verification...
  Cleaning up challenges
  Error in checking parameter list: /etc/init.d/apache2: invalid option -- 't'
  
  Apache is unable to check whether or not the module is loaded because Apache is misconfigured.
  ```
  
  ## Certbot's behavior differed from what I expected because:
  Certbot did not install the certificate because it failed to run apache2ctl -t -D DUMP_MODULES
  
  </issue>
  <code>
  [start of certbot-apache/certbot_apache/override_gentoo.py]
  1 """ Distribution specific override class for Gentoo Linux """
  2 import pkg_resources
  3 
  4 import zope.interface
  5 
  6 from certbot import interfaces
  7 
  8 from certbot_apache import apache_util
  9 from certbot_apache import configurator
  10 from certbot_apache import parser
  11 
  12 @zope.interface.provider(interfaces.IPluginFactory)
  13 class GentooConfigurator(configurator.ApacheConfigurator):
  14     """Gentoo specific ApacheConfigurator override class"""
  15 
  16     OS_DEFAULTS = dict(
  17         server_root="/etc/apache2",
  18         vhost_root="/etc/apache2/vhosts.d",
  19         vhost_files="*.conf",
  20         logs_root="/var/log/apache2",
  21         version_cmd=['/usr/sbin/apache2', '-v'],
  22         apache_cmd="apache2ctl",
  23         restart_cmd=['apache2ctl', 'graceful'],
  24         conftest_cmd=['apache2ctl', 'configtest'],
  25         enmod=None,
  26         dismod=None,
  27         le_vhost_ext="-le-ssl.conf",
  28         handle_mods=False,
  29         handle_sites=False,
  30         challenge_location="/etc/apache2/vhosts.d",
  31         MOD_SSL_CONF_SRC=pkg_resources.resource_filename(
  32             "certbot_apache", "options-ssl-apache.conf")
  33     )
  34 
  35     def get_parser(self):
  36         """Initializes the ApacheParser"""
  37         return GentooParser(
  38             self.aug, self.conf("server-root"), self.conf("vhost-root"),
  39             self.version, configurator=self)
  40 
  41 
  42 class GentooParser(parser.ApacheParser):
  43     """Gentoo specific ApacheParser override class"""
  44     def __init__(self, *args, **kwargs):
  45         # Gentoo specific configuration file for Apache2
  46         self.apacheconfig_filep = "/etc/conf.d/apache2"
  47         super(GentooParser, self).__init__(*args, **kwargs)
  48 
  49     def update_runtime_variables(self):
  50         """ Override for update_runtime_variables for custom parsing """
  51         self.parse_sysconfig_var()
  52 
  53     def parse_sysconfig_var(self):
  54         """ Parses Apache CLI options from Gentoo configuration file """
  55         defines = apache_util.parse_define_file(self.apacheconfig_filep,
  56                                                 "APACHE2_OPTS")
  57         for k in defines.keys():
  58             self.variables[k] = defines[k]
  59
  [end of certbot-apache/certbot_apache/override_gentoo.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/certbot-apache/certbot_apache/override_gentoo.py b/certbot-apache/certbot_apache/override_gentoo.py
  --- a/certbot-apache/certbot_apache/override_gentoo.py
  +++ b/certbot-apache/certbot_apache/override_gentoo.py
  @@ -49,6 +49,7 @@
       def update_runtime_variables(self):
           """ Override for update_runtime_variables for custom parsing """
           self.parse_sysconfig_var()
  +        self.update_modules()
   
       def parse_sysconfig_var(self):
           """ Parses Apache CLI options from Gentoo configuration file """
  @@ -56,3 +57,10 @@
                                                   "APACHE2_OPTS")
           for k in defines.keys():
               self.variables[k] = defines[k]
  +
  +    def update_modules(self):
  +        """Get loaded modules from httpd process, and add them to DOM"""
  +        mod_cmd = [self.configurator.constant("apache_cmd"), "modules"]
  +        matches = self.parse_from_subprocess(mod_cmd, r"(.*)_module")
  +        for mod in matches:
  +            self.add_mod(mod.strip())
  
verification_info: {"golden_diff": "diff --git a/certbot-apache/certbot_apache/override_gentoo.py b/certbot-apache/certbot_apache/override_gentoo.py\n--- a/certbot-apache/certbot_apache/override_gentoo.py\n+++ b/certbot-apache/certbot_apache/override_gentoo.py\n@@ -49,6 +49,7 @@\n     def update_runtime_variables(self):\n         \"\"\" Override for update_runtime_variables for custom parsing \"\"\"\n         self.parse_sysconfig_var()\n+        self.update_modules()\n \n     def parse_sysconfig_var(self):\n         \"\"\" Parses Apache CLI options from Gentoo configuration file \"\"\"\n@@ -56,3 +57,10 @@\n                                                 \"APACHE2_OPTS\")\n         for k in defines.keys():\n             self.variables[k] = defines[k]\n+\n+    def update_modules(self):\n+        \"\"\"Get loaded modules from httpd process, and add them to DOM\"\"\"\n+        mod_cmd = [self.configurator.constant(\"apache_cmd\"), \"modules\"]\n+        matches = self.parse_from_subprocess(mod_cmd, r\"(.*)_module\")\n+        for mod in matches:\n+            self.add_mod(mod.strip())\n", "issue": "Can't install new certificates with certbot-apache under Gentoo since version 0.20.0\nIt seems that version 0.20.0 has a major architecture revision from 0.19.0, in particular regarding OS specific overrides. But the Gentoo overrides have a flaw when trying to install a new certificate : at one point it tries to run \"apache2ctl -t -D DUMP_MODULES\", which is no good at all under Gentoo because apache2ctl is a dummy script redirecting to /etc/init.d/apache2. It generates this error :\r\n\r\n`Error in checking parameter list: /etc/init.d/apache2: invalid option -- 't'`\r\n\r\n## My operating system is (include version):\r\nGentoo\r\n\r\n## I installed Certbot with (certbot-auto, OS package manager, pip, etc):\r\nOS package manager (emerge) with testing (~amd64) flag\r\n\r\n## I ran this command and it produced this output:\r\n```\r\ncertbot -d test.example.com\r\nSaving debug log to /var/log/letsencrypt/letsencrypt.log\r\nPlugins selected: Authenticator apache, Installer apache\r\nObtaining a new certificate\r\nPerforming the following challenges:\r\ntls-sni-01 challenge for test.example.com\r\nWaiting for verification...\r\nCleaning up challenges\r\nError in checking parameter list: /etc/init.d/apache2: invalid option -- 't'\r\n\r\nApache is unable to check whether or not the module is loaded because Apache is misconfigured.\r\n```\r\n\r\n## Certbot's behavior differed from what I expected because:\r\nCertbot did not install the certificate because it failed to run apache2ctl -t -D DUMP_MODULES\n", "before_files": [{"content": "\"\"\" Distribution specific override class for Gentoo Linux \"\"\"\nimport pkg_resources\n\nimport zope.interface\n\nfrom certbot import interfaces\n\nfrom certbot_apache import apache_util\nfrom certbot_apache import configurator\nfrom certbot_apache import parser\n\n@zope.interface.provider(interfaces.IPluginFactory)\nclass GentooConfigurator(configurator.ApacheConfigurator):\n    \"\"\"Gentoo specific ApacheConfigurator override class\"\"\"\n\n    OS_DEFAULTS = dict(\n        server_root=\"/etc/apache2\",\n        vhost_root=\"/etc/apache2/vhosts.d\",\n        vhost_files=\"*.conf\",\n        logs_root=\"/var/log/apache2\",\n        version_cmd=['/usr/sbin/apache2', '-v'],\n        apache_cmd=\"apache2ctl\",\n        restart_cmd=['apache2ctl', 'graceful'],\n        conftest_cmd=['apache2ctl', 'configtest'],\n        enmod=None,\n        dismod=None,\n        le_vhost_ext=\"-le-ssl.conf\",\n        handle_mods=False,\n        handle_sites=False,\n        challenge_location=\"/etc/apache2/vhosts.d\",\n        MOD_SSL_CONF_SRC=pkg_resources.resource_filename(\n            \"certbot_apache\", \"options-ssl-apache.conf\")\n    )\n\n    def get_parser(self):\n        \"\"\"Initializes the ApacheParser\"\"\"\n        return GentooParser(\n            self.aug, self.conf(\"server-root\"), self.conf(\"vhost-root\"),\n            self.version, configurator=self)\n\n\nclass GentooParser(parser.ApacheParser):\n    \"\"\"Gentoo specific ApacheParser override class\"\"\"\n    def __init__(self, *args, **kwargs):\n        # Gentoo specific configuration file for Apache2\n        self.apacheconfig_filep = \"/etc/conf.d/apache2\"\n        super(GentooParser, self).__init__(*args, **kwargs)\n\n    def update_runtime_variables(self):\n        \"\"\" Override for update_runtime_variables for custom parsing \"\"\"\n        self.parse_sysconfig_var()\n\n    def parse_sysconfig_var(self):\n        \"\"\" Parses Apache CLI options from Gentoo configuration file \"\"\"\n        defines = apache_util.parse_define_file(self.apacheconfig_filep,\n                                                \"APACHE2_OPTS\")\n        for k in defines.keys():\n            self.variables[k] = defines[k]\n", "path": "certbot-apache/certbot_apache/override_gentoo.py"}]}