We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
postfix throttling afer a hard shutdown
After a hard shutdown, I noticed that postfix would not restart because of master.pid is found in /queue/pid/master.pid
We should check and remove this file during container start up (start.py)
postfix throttling afer a hard shutdown
After a hard shutdown, I noticed that postfix would not restart because of master.pid is found in /queue/pid/master.pid
We should check and remove this file during container start up (start.py)

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `core/postfix/start.py`
Content:
```
1 #!/usr/bin/env python3
2 
3 import os
4 import glob
5 import shutil
6 import multiprocessing
7 import logging as log
8 import sys
9 import re
10 
11 from podop import run_server
12 from pwd import getpwnam
13 from socrate import system, conf
14 
15 log.basicConfig(stream=sys.stderr, level=os.environ.get("LOG_LEVEL", "WARNING"))
16 
17 def start_podop():
18     os.setuid(getpwnam('postfix').pw_uid)
19     os.makedirs('/dev/shm/postfix',mode=0o700, exist_ok=True)
20     url = "http://" + os.environ["ADMIN_ADDRESS"] + "/internal/postfix/"
21     # TODO: Remove verbosity setting from Podop?
22     run_server(0, "postfix", "/tmp/podop.socket", [
23         ("transport", "url", url + "transport/§"),
24         ("alias", "url", url + "alias/§"),
25         ("dane", "url", url + "dane/§"),
26         ("domain", "url", url + "domain/§"),
27         ("mailbox", "url", url + "mailbox/§"),
28         ("recipientmap", "url", url + "recipient/map/§"),
29         ("sendermap", "url", url + "sender/map/§"),
30         ("senderlogin", "url", url + "sender/login/§"),
31         ("senderrate", "url", url + "sender/rate/§")
32     ])
33 
34 def start_mta_sts_daemon():
35     os.chmod("/root/", 0o755) # read access to /root/.netrc required
36     os.setuid(getpwnam('postfix').pw_uid)
37     from postfix_mta_sts_resolver import daemon
38     daemon.main()
39 
40 def is_valid_postconf_line(line):
41     return not line.startswith("#") \
42             and not line == ''
43 
44 # Actual startup script
45 os.environ['DEFER_ON_TLS_ERROR'] = os.environ['DEFER_ON_TLS_ERROR'] if 'DEFER_ON_TLS_ERROR' in os.environ else 'True'
46 os.environ["FRONT_ADDRESS"] = system.get_host_address_from_environment("FRONT", "front")
47 os.environ["ADMIN_ADDRESS"] = system.get_host_address_from_environment("ADMIN", "admin")
48 os.environ["ANTISPAM_MILTER_ADDRESS"] = system.get_host_address_from_environment("ANTISPAM_MILTER", "antispam:11332")
49 os.environ["LMTP_ADDRESS"] = system.get_host_address_from_environment("LMTP", "imap:2525")
50 os.environ["POSTFIX_LOG_SYSLOG"] = os.environ.get("POSTFIX_LOG_SYSLOG","local")
51 os.environ["POSTFIX_LOG_FILE"] = os.environ.get("POSTFIX_LOG_FILE", "")
52 
53 # Postfix requires IPv6 addresses to be wrapped in square brackets
54 if 'RELAYNETS' in os.environ:
55     os.environ["RELAYNETS"] = re.sub(r'([0-9a-fA-F]+:[0-9a-fA-F:]+)/', '[\\1]/', os.environ["RELAYNETS"])
56 
57 for postfix_file in glob.glob("/conf/*.cf"):
58     conf.jinja(postfix_file, os.environ, os.path.join("/etc/postfix", os.path.basename(postfix_file)))
59 
60 if os.path.exists("/overrides/postfix.cf"):
61     for line in open("/overrides/postfix.cf").read().strip().split("\n"):
62         if is_valid_postconf_line(line):
63             os.system('postconf -e "{}"'.format(line))
64 
65 if os.path.exists("/overrides/postfix.master"):
66     for line in open("/overrides/postfix.master").read().strip().split("\n"):
67         if is_valid_postconf_line(line):
68             os.system('postconf -Me "{}"'.format(line))
69 
70 for map_file in glob.glob("/overrides/*.map"):
71     destination = os.path.join("/etc/postfix", os.path.basename(map_file))
72     shutil.copyfile(map_file, destination)
73     os.system("postmap {}".format(destination))
74     os.remove(destination)
75 
76 if os.path.exists("/overrides/mta-sts-daemon.yml"):
77     shutil.copyfile("/overrides/mta-sts-daemon.yml", "/etc/mta-sts-daemon.yml")
78 else:
79     conf.jinja("/conf/mta-sts-daemon.yml", os.environ, "/etc/mta-sts-daemon.yml")
80 
81 for policy in ['tls_policy', 'transport']:
82     if not os.path.exists(f'/etc/postfix/{policy}.map.lmdb'):
83         open(f'/etc/postfix/{policy}.map', 'a').close()
84         os.system(f'postmap /etc/postfix/{policy}.map')
85 
86 if "RELAYUSER" in os.environ:
87     path = "/etc/postfix/sasl_passwd"
88     conf.jinja("/conf/sasl_passwd", os.environ, path)
89     os.system("postmap {}".format(path))
90 
91 # Configure and start local rsyslog server
92 conf.jinja("/conf/rsyslog.conf", os.environ, "/etc/rsyslog.conf")
93 os.system("/usr/sbin/rsyslogd -niNONE &")
94 # Configure logrotate and start crond
95 if os.environ["POSTFIX_LOG_FILE"] != "":
96     conf.jinja("/conf/logrotate.conf", os.environ, "/etc/logrotate.d/postfix.conf")
97     os.system("/usr/sbin/crond")
98     if os.path.exists("/overrides/logrotate.conf"):
99         shutil.copyfile("/overrides/logrotate.conf", "/etc/logrotate.d/postfix.conf")
100 
101 # Run Podop and Postfix
102 multiprocessing.Process(target=start_podop).start()
103 multiprocessing.Process(target=start_mta_sts_daemon).start()
104 os.system("/usr/libexec/postfix/post-install meta_directory=/etc/postfix create-missing")
105 # Before starting postfix, we need to check permissions on /queue
106 # in the event that postfix,postdrop id have changed
107 os.system("postfix set-permissions")
108 os.system("postfix start-fg")
109
```
--- 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/core/postfix/start.py b/core/postfix/start.py
--- a/core/postfix/start.py
+++ b/core/postfix/start.py
@@ -14,6 +14,8 @@
 
 log.basicConfig(stream=sys.stderr, level=os.environ.get("LOG_LEVEL", "WARNING"))
 
+os.system("flock -n /queue/pid/master.pid rm /queue/pid/master.pid")
+
 def start_podop():
     os.setuid(getpwnam('postfix').pw_uid)
     os.makedirs('/dev/shm/postfix',mode=0o700, exist_ok=True)

{"golden_diff": "diff --git a/core/postfix/start.py b/core/postfix/start.py\n--- a/core/postfix/start.py\n+++ b/core/postfix/start.py\n@@ -14,6 +14,8 @@\n \n log.basicConfig(stream=sys.stderr, level=os.environ.get(\"LOG_LEVEL\", \"WARNING\"))\n \n+os.system(\"flock -n /queue/pid/master.pid rm /queue/pid/master.pid\")\n+\n def start_podop():\n     os.setuid(getpwnam('postfix').pw_uid)\n     os.makedirs('/dev/shm/postfix',mode=0o700, exist_ok=True)\n", "issue": "postfix throttling afer a hard shutdown\nAfter a hard shutdown, I noticed that postfix would not restart because of master.pid is found in /queue/pid/master.pid\r\nWe should check and remove this file during container start up (start.py)\npostfix throttling afer a hard shutdown\nAfter a hard shutdown, I noticed that postfix would not restart because of master.pid is found in /queue/pid/master.pid\r\nWe should check and remove this file during container start up (start.py)\n", "before_files": [{"content": "#!/usr/bin/env python3\n\nimport os\nimport glob\nimport shutil\nimport multiprocessing\nimport logging as log\nimport sys\nimport re\n\nfrom podop import run_server\nfrom pwd import getpwnam\nfrom socrate import system, conf\n\nlog.basicConfig(stream=sys.stderr, level=os.environ.get(\"LOG_LEVEL\", \"WARNING\"))\n\ndef start_podop():\n    os.setuid(getpwnam('postfix').pw_uid)\n    os.makedirs('/dev/shm/postfix',mode=0o700, exist_ok=True)\n    url = \"http://\" + os.environ[\"ADMIN_ADDRESS\"] + \"/internal/postfix/\"\n    # TODO: Remove verbosity setting from Podop?\n    run_server(0, \"postfix\", \"/tmp/podop.socket\", [\n        (\"transport\", \"url\", url + \"transport/\u00a7\"),\n        (\"alias\", \"url\", url + \"alias/\u00a7\"),\n        (\"dane\", \"url\", url + \"dane/\u00a7\"),\n        (\"domain\", \"url\", url + \"domain/\u00a7\"),\n        (\"mailbox\", \"url\", url + \"mailbox/\u00a7\"),\n        (\"recipientmap\", \"url\", url + \"recipient/map/\u00a7\"),\n        (\"sendermap\", \"url\", url + \"sender/map/\u00a7\"),\n        (\"senderlogin\", \"url\", url + \"sender/login/\u00a7\"),\n        (\"senderrate\", \"url\", url + \"sender/rate/\u00a7\")\n    ])\n\ndef start_mta_sts_daemon():\n    os.chmod(\"/root/\", 0o755) # read access to /root/.netrc required\n    os.setuid(getpwnam('postfix').pw_uid)\n    from postfix_mta_sts_resolver import daemon\n    daemon.main()\n\ndef is_valid_postconf_line(line):\n    return not line.startswith(\"#\") \\\n            and not line == ''\n\n# Actual startup script\nos.environ['DEFER_ON_TLS_ERROR'] = os.environ['DEFER_ON_TLS_ERROR'] if 'DEFER_ON_TLS_ERROR' in os.environ else 'True'\nos.environ[\"FRONT_ADDRESS\"] = system.get_host_address_from_environment(\"FRONT\", \"front\")\nos.environ[\"ADMIN_ADDRESS\"] = system.get_host_address_from_environment(\"ADMIN\", \"admin\")\nos.environ[\"ANTISPAM_MILTER_ADDRESS\"] = system.get_host_address_from_environment(\"ANTISPAM_MILTER\", \"antispam:11332\")\nos.environ[\"LMTP_ADDRESS\"] = system.get_host_address_from_environment(\"LMTP\", \"imap:2525\")\nos.environ[\"POSTFIX_LOG_SYSLOG\"] = os.environ.get(\"POSTFIX_LOG_SYSLOG\",\"local\")\nos.environ[\"POSTFIX_LOG_FILE\"] = os.environ.get(\"POSTFIX_LOG_FILE\", \"\")\n\n# Postfix requires IPv6 addresses to be wrapped in square brackets\nif 'RELAYNETS' in os.environ:\n    os.environ[\"RELAYNETS\"] = re.sub(r'([0-9a-fA-F]+:[0-9a-fA-F:]+)/', '[\\\\1]/', os.environ[\"RELAYNETS\"])\n\nfor postfix_file in glob.glob(\"/conf/*.cf\"):\n    conf.jinja(postfix_file, os.environ, os.path.join(\"/etc/postfix\", os.path.basename(postfix_file)))\n\nif os.path.exists(\"/overrides/postfix.cf\"):\n    for line in open(\"/overrides/postfix.cf\").read().strip().split(\"\\n\"):\n        if is_valid_postconf_line(line):\n            os.system('postconf -e \"{}\"'.format(line))\n\nif os.path.exists(\"/overrides/postfix.master\"):\n    for line in open(\"/overrides/postfix.master\").read().strip().split(\"\\n\"):\n        if is_valid_postconf_line(line):\n            os.system('postconf -Me \"{}\"'.format(line))\n\nfor map_file in glob.glob(\"/overrides/*.map\"):\n    destination = os.path.join(\"/etc/postfix\", os.path.basename(map_file))\n    shutil.copyfile(map_file, destination)\n    os.system(\"postmap {}\".format(destination))\n    os.remove(destination)\n\nif os.path.exists(\"/overrides/mta-sts-daemon.yml\"):\n    shutil.copyfile(\"/overrides/mta-sts-daemon.yml\", \"/etc/mta-sts-daemon.yml\")\nelse:\n    conf.jinja(\"/conf/mta-sts-daemon.yml\", os.environ, \"/etc/mta-sts-daemon.yml\")\n\nfor policy in ['tls_policy', 'transport']:\n    if not os.path.exists(f'/etc/postfix/{policy}.map.lmdb'):\n        open(f'/etc/postfix/{policy}.map', 'a').close()\n        os.system(f'postmap /etc/postfix/{policy}.map')\n\nif \"RELAYUSER\" in os.environ:\n    path = \"/etc/postfix/sasl_passwd\"\n    conf.jinja(\"/conf/sasl_passwd\", os.environ, path)\n    os.system(\"postmap {}\".format(path))\n\n# Configure and start local rsyslog server\nconf.jinja(\"/conf/rsyslog.conf\", os.environ, \"/etc/rsyslog.conf\")\nos.system(\"/usr/sbin/rsyslogd -niNONE &\")\n# Configure logrotate and start crond\nif os.environ[\"POSTFIX_LOG_FILE\"] != \"\":\n    conf.jinja(\"/conf/logrotate.conf\", os.environ, \"/etc/logrotate.d/postfix.conf\")\n    os.system(\"/usr/sbin/crond\")\n    if os.path.exists(\"/overrides/logrotate.conf\"):\n        shutil.copyfile(\"/overrides/logrotate.conf\", \"/etc/logrotate.d/postfix.conf\")\n\n# Run Podop and Postfix\nmultiprocessing.Process(target=start_podop).start()\nmultiprocessing.Process(target=start_mta_sts_daemon).start()\nos.system(\"/usr/libexec/postfix/post-install meta_directory=/etc/postfix create-missing\")\n# Before starting postfix, we need to check permissions on /queue\n# in the event that postfix,postdrop id have changed\nos.system(\"postfix set-permissions\")\nos.system(\"postfix start-fg\")\n", "path": "core/postfix/start.py"}], "after_files": [{"content": "#!/usr/bin/env python3\n\nimport os\nimport glob\nimport shutil\nimport multiprocessing\nimport logging as log\nimport sys\nimport re\n\nfrom podop import run_server\nfrom pwd import getpwnam\nfrom socrate import system, conf\n\nlog.basicConfig(stream=sys.stderr, level=os.environ.get(\"LOG_LEVEL\", \"WARNING\"))\n\nos.system(\"flock -n /queue/pid/master.pid rm /queue/pid/master.pid\")\n\ndef start_podop():\n    os.setuid(getpwnam('postfix').pw_uid)\n    os.makedirs('/dev/shm/postfix',mode=0o700, exist_ok=True)\n    url = \"http://\" + os.environ[\"ADMIN_ADDRESS\"] + \"/internal/postfix/\"\n    # TODO: Remove verbosity setting from Podop?\n    run_server(0, \"postfix\", \"/tmp/podop.socket\", [\n        (\"transport\", \"url\", url + \"transport/\u00a7\"),\n        (\"alias\", \"url\", url + \"alias/\u00a7\"),\n        (\"dane\", \"url\", url + \"dane/\u00a7\"),\n        (\"domain\", \"url\", url + \"domain/\u00a7\"),\n        (\"mailbox\", \"url\", url + \"mailbox/\u00a7\"),\n        (\"recipientmap\", \"url\", url + \"recipient/map/\u00a7\"),\n        (\"sendermap\", \"url\", url + \"sender/map/\u00a7\"),\n        (\"senderlogin\", \"url\", url + \"sender/login/\u00a7\"),\n        (\"senderrate\", \"url\", url + \"sender/rate/\u00a7\")\n    ])\n\ndef start_mta_sts_daemon():\n    os.chmod(\"/root/\", 0o755) # read access to /root/.netrc required\n    os.setuid(getpwnam('postfix').pw_uid)\n    from postfix_mta_sts_resolver import daemon\n    daemon.main()\n\ndef is_valid_postconf_line(line):\n    return not line.startswith(\"#\") \\\n            and not line == ''\n\n# Actual startup script\nos.environ['DEFER_ON_TLS_ERROR'] = os.environ['DEFER_ON_TLS_ERROR'] if 'DEFER_ON_TLS_ERROR' in os.environ else 'True'\nos.environ[\"FRONT_ADDRESS\"] = system.get_host_address_from_environment(\"FRONT\", \"front\")\nos.environ[\"ADMIN_ADDRESS\"] = system.get_host_address_from_environment(\"ADMIN\", \"admin\")\nos.environ[\"ANTISPAM_MILTER_ADDRESS\"] = system.get_host_address_from_environment(\"ANTISPAM_MILTER\", \"antispam:11332\")\nos.environ[\"LMTP_ADDRESS\"] = system.get_host_address_from_environment(\"LMTP\", \"imap:2525\")\nos.environ[\"POSTFIX_LOG_SYSLOG\"] = os.environ.get(\"POSTFIX_LOG_SYSLOG\",\"local\")\nos.environ[\"POSTFIX_LOG_FILE\"] = os.environ.get(\"POSTFIX_LOG_FILE\", \"\")\n\n# Postfix requires IPv6 addresses to be wrapped in square brackets\nif 'RELAYNETS' in os.environ:\n    os.environ[\"RELAYNETS\"] = re.sub(r'([0-9a-fA-F]+:[0-9a-fA-F:]+)/', '[\\\\1]/', os.environ[\"RELAYNETS\"])\n\nfor postfix_file in glob.glob(\"/conf/*.cf\"):\n    conf.jinja(postfix_file, os.environ, os.path.join(\"/etc/postfix\", os.path.basename(postfix_file)))\n\nif os.path.exists(\"/overrides/postfix.cf\"):\n    for line in open(\"/overrides/postfix.cf\").read().strip().split(\"\\n\"):\n        if is_valid_postconf_line(line):\n            os.system('postconf -e \"{}\"'.format(line))\n\nif os.path.exists(\"/overrides/postfix.master\"):\n    for line in open(\"/overrides/postfix.master\").read().strip().split(\"\\n\"):\n        if is_valid_postconf_line(line):\n            os.system('postconf -Me \"{}\"'.format(line))\n\nfor map_file in glob.glob(\"/overrides/*.map\"):\n    destination = os.path.join(\"/etc/postfix\", os.path.basename(map_file))\n    shutil.copyfile(map_file, destination)\n    os.system(\"postmap {}\".format(destination))\n    os.remove(destination)\n\nif os.path.exists(\"/overrides/mta-sts-daemon.yml\"):\n    shutil.copyfile(\"/overrides/mta-sts-daemon.yml\", \"/etc/mta-sts-daemon.yml\")\nelse:\n    conf.jinja(\"/conf/mta-sts-daemon.yml\", os.environ, \"/etc/mta-sts-daemon.yml\")\n\nfor policy in ['tls_policy', 'transport']:\n    if not os.path.exists(f'/etc/postfix/{policy}.map.lmdb'):\n        open(f'/etc/postfix/{policy}.map', 'a').close()\n        os.system(f'postmap /etc/postfix/{policy}.map')\n\nif \"RELAYUSER\" in os.environ:\n    path = \"/etc/postfix/sasl_passwd\"\n    conf.jinja(\"/conf/sasl_passwd\", os.environ, path)\n    os.system(\"postmap {}\".format(path))\n\n# Configure and start local rsyslog server\nconf.jinja(\"/conf/rsyslog.conf\", os.environ, \"/etc/rsyslog.conf\")\nos.system(\"/usr/sbin/rsyslogd -niNONE &\")\n# Configure logrotate and start crond\nif os.environ[\"POSTFIX_LOG_FILE\"] != \"\":\n    conf.jinja(\"/conf/logrotate.conf\", os.environ, \"/etc/logrotate.d/postfix.conf\")\n    os.system(\"/usr/sbin/crond\")\n    if os.path.exists(\"/overrides/logrotate.conf\"):\n        shutil.copyfile(\"/overrides/logrotate.conf\", \"/etc/logrotate.d/postfix.conf\")\n\n# Run Podop and Postfix\nmultiprocessing.Process(target=start_podop).start()\nmultiprocessing.Process(target=start_mta_sts_daemon).start()\nos.system(\"/usr/libexec/postfix/post-install meta_directory=/etc/postfix create-missing\")\n# Before starting postfix, we need to check permissions on /queue\n# in the event that postfix,postdrop id have changed\nos.system(\"postfix set-permissions\")\nos.system(\"postfix start-fg\")\n", "path": "core/postfix/start.py"}]}