We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Add ability to keep retrying with a lock error
The yum installer (IIRC) has a nice feature that it will keep trying every 10 seconds or so if there is a lock error. This could be useful for conda. 


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `conda/lock.py`
Content:
```
1 # (c) 2012-2013 Continuum Analytics, Inc. / http://continuum.io
2 # All Rights Reserved
3 #
4 # conda is distributed under the terms of the BSD 3-clause license.
5 # Consult LICENSE.txt or http://opensource.org/licenses/BSD-3-Clause.
6 
7 """
8 Tools for working with locks
9 
10 A lock is just an empty directory. We use directories because this lets us use
11 the race condition-proof os.makedirs.
12 
13 For now, there is one global lock for all of conda, because some things happen
14 globally (such as downloading packages).
15 
16 We don't raise an error if the lock is named with the current PID
17 """
18 
19 import os
20 from os.path import join
21 import glob
22 
23 
24 LOCKFN = '.conda_lock'
25 
26 
27 class Locked(object):
28     """
29     Context manager to handle locks.
30     """
31     def __init__(self, path):
32         self.path = path
33         self.end = "-" + str(os.getpid())
34         self.lock_path = join(self.path, LOCKFN + self.end)
35         self.pattern = join(self.path, LOCKFN + '-*')
36         self.remove = True
37 
38     def __enter__(self):
39         files = glob.glob(self.pattern)
40         if files and not files[0].endswith(self.end):
41             # Keep the string "LOCKERROR" in this string so that external
42             # programs can look for it.
43             raise RuntimeError("""\
44 LOCKERROR: It looks like conda is already doing something.
45 The lock %s was found. Wait for it to finish before continuing.
46 If you are sure that conda is not running, remove it and try again.
47 You can also use: $ conda clean --lock""" % self.lock_path)
48 
49         if not files:
50             try:
51                 os.makedirs(self.lock_path)
52             except OSError:
53                 pass
54         else: # PID lock already here --- someone else will remove it.
55             self.remove = False
56 
57     def __exit__(self, exc_type, exc_value, traceback):
58         if self.remove:
59             for path in self.lock_path, self.path:
60                 try:
61                     os.rmdir(path)
62                 except OSError:
63                     pass
64
```
--- 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/conda/lock.py b/conda/lock.py
--- a/conda/lock.py
+++ b/conda/lock.py
@@ -19,7 +19,7 @@
 import os
 from os.path import join
 import glob
-
+from time import sleep
 
 LOCKFN = '.conda_lock'
 
@@ -36,15 +36,28 @@
         self.remove = True
 
     def __enter__(self):
-        files = glob.glob(self.pattern)
-        if files and not files[0].endswith(self.end):
-            # Keep the string "LOCKERROR" in this string so that external
-            # programs can look for it.
-            raise RuntimeError("""\
-LOCKERROR: It looks like conda is already doing something.
-The lock %s was found. Wait for it to finish before continuing.
-If you are sure that conda is not running, remove it and try again.
-You can also use: $ conda clean --lock""" % self.lock_path)
+        retries = 10
+        # Keep the string "LOCKERROR" in this string so that external
+        # programs can look for it.
+        lockstr = ("""\
+    LOCKERROR: It looks like conda is already doing something.
+    The lock %s was found. Wait for it to finish before continuing.
+    If you are sure that conda is not running, remove it and try again.
+    You can also use: $ conda clean --lock""" % self.lock_path)
+        sleeptime = 1
+        while retries:
+            files = glob.glob(self.pattern)
+            if files and not files[0].endswith(self.end):
+                print(lockstr)
+                print("Sleeping for %s seconds" % sleeptime)
+                sleep(sleeptime)
+                sleeptime *= 2
+                retries -= 1
+            else:
+                break
+        else:
+            print("Exceeded max retries, giving up")
+            raise RuntimeError(lockstr)
 
         if not files:
             try:

{"golden_diff": "diff --git a/conda/lock.py b/conda/lock.py\n--- a/conda/lock.py\n+++ b/conda/lock.py\n@@ -19,7 +19,7 @@\n import os\n from os.path import join\n import glob\n-\n+from time import sleep\n \n LOCKFN = '.conda_lock'\n \n@@ -36,15 +36,28 @@\n         self.remove = True\n \n     def __enter__(self):\n-        files = glob.glob(self.pattern)\n-        if files and not files[0].endswith(self.end):\n-            # Keep the string \"LOCKERROR\" in this string so that external\n-            # programs can look for it.\n-            raise RuntimeError(\"\"\"\\\n-LOCKERROR: It looks like conda is already doing something.\n-The lock %s was found. Wait for it to finish before continuing.\n-If you are sure that conda is not running, remove it and try again.\n-You can also use: $ conda clean --lock\"\"\" % self.lock_path)\n+        retries = 10\n+        # Keep the string \"LOCKERROR\" in this string so that external\n+        # programs can look for it.\n+        lockstr = (\"\"\"\\\n+    LOCKERROR: It looks like conda is already doing something.\n+    The lock %s was found. Wait for it to finish before continuing.\n+    If you are sure that conda is not running, remove it and try again.\n+    You can also use: $ conda clean --lock\"\"\" % self.lock_path)\n+        sleeptime = 1\n+        while retries:\n+            files = glob.glob(self.pattern)\n+            if files and not files[0].endswith(self.end):\n+                print(lockstr)\n+                print(\"Sleeping for %s seconds\" % sleeptime)\n+                sleep(sleeptime)\n+                sleeptime *= 2\n+                retries -= 1\n+            else:\n+                break\n+        else:\n+            print(\"Exceeded max retries, giving up\")\n+            raise RuntimeError(lockstr)\n \n         if not files:\n             try:\n", "issue": "Add ability to keep retrying with a lock error\nThe yum installer (IIRC) has a nice feature that it will keep trying every 10 seconds or so if there is a lock error. This could be useful for conda. \n\n", "before_files": [{"content": "# (c) 2012-2013 Continuum Analytics, Inc. / http://continuum.io\n# All Rights Reserved\n#\n# conda is distributed under the terms of the BSD 3-clause license.\n# Consult LICENSE.txt or http://opensource.org/licenses/BSD-3-Clause.\n\n\"\"\"\nTools for working with locks\n\nA lock is just an empty directory. We use directories because this lets us use\nthe race condition-proof os.makedirs.\n\nFor now, there is one global lock for all of conda, because some things happen\nglobally (such as downloading packages).\n\nWe don't raise an error if the lock is named with the current PID\n\"\"\"\n\nimport os\nfrom os.path import join\nimport glob\n\n\nLOCKFN = '.conda_lock'\n\n\nclass Locked(object):\n    \"\"\"\n    Context manager to handle locks.\n    \"\"\"\n    def __init__(self, path):\n        self.path = path\n        self.end = \"-\" + str(os.getpid())\n        self.lock_path = join(self.path, LOCKFN + self.end)\n        self.pattern = join(self.path, LOCKFN + '-*')\n        self.remove = True\n\n    def __enter__(self):\n        files = glob.glob(self.pattern)\n        if files and not files[0].endswith(self.end):\n            # Keep the string \"LOCKERROR\" in this string so that external\n            # programs can look for it.\n            raise RuntimeError(\"\"\"\\\nLOCKERROR: It looks like conda is already doing something.\nThe lock %s was found. Wait for it to finish before continuing.\nIf you are sure that conda is not running, remove it and try again.\nYou can also use: $ conda clean --lock\"\"\" % self.lock_path)\n\n        if not files:\n            try:\n                os.makedirs(self.lock_path)\n            except OSError:\n                pass\n        else: # PID lock already here --- someone else will remove it.\n            self.remove = False\n\n    def __exit__(self, exc_type, exc_value, traceback):\n        if self.remove:\n            for path in self.lock_path, self.path:\n                try:\n                    os.rmdir(path)\n                except OSError:\n                    pass\n", "path": "conda/lock.py"}], "after_files": [{"content": "# (c) 2012-2013 Continuum Analytics, Inc. / http://continuum.io\n# All Rights Reserved\n#\n# conda is distributed under the terms of the BSD 3-clause license.\n# Consult LICENSE.txt or http://opensource.org/licenses/BSD-3-Clause.\n\n\"\"\"\nTools for working with locks\n\nA lock is just an empty directory. We use directories because this lets us use\nthe race condition-proof os.makedirs.\n\nFor now, there is one global lock for all of conda, because some things happen\nglobally (such as downloading packages).\n\nWe don't raise an error if the lock is named with the current PID\n\"\"\"\n\nimport os\nfrom os.path import join\nimport glob\nfrom time import sleep\n\nLOCKFN = '.conda_lock'\n\n\nclass Locked(object):\n    \"\"\"\n    Context manager to handle locks.\n    \"\"\"\n    def __init__(self, path):\n        self.path = path\n        self.end = \"-\" + str(os.getpid())\n        self.lock_path = join(self.path, LOCKFN + self.end)\n        self.pattern = join(self.path, LOCKFN + '-*')\n        self.remove = True\n\n    def __enter__(self):\n        retries = 10\n        # Keep the string \"LOCKERROR\" in this string so that external\n        # programs can look for it.\n        lockstr = (\"\"\"\\\n    LOCKERROR: It looks like conda is already doing something.\n    The lock %s was found. Wait for it to finish before continuing.\n    If you are sure that conda is not running, remove it and try again.\n    You can also use: $ conda clean --lock\"\"\" % self.lock_path)\n        sleeptime = 1\n        while retries:\n            files = glob.glob(self.pattern)\n            if files and not files[0].endswith(self.end):\n                print(lockstr)\n                print(\"Sleeping for %s seconds\" % sleeptime)\n                sleep(sleeptime)\n                sleeptime *= 2\n                retries -= 1\n            else:\n                break\n        else:\n            print(\"Exceeded max retries, giving up\")\n            raise RuntimeError(lockstr)\n\n        if not files:\n            try:\n                os.makedirs(self.lock_path)\n            except OSError:\n                pass\n        else: # PID lock already here --- someone else will remove it.\n            self.remove = False\n\n    def __exit__(self, exc_type, exc_value, traceback):\n        if self.remove:\n            for path in self.lock_path, self.path:\n                try:\n                    os.rmdir(path)\n                except OSError:\n                    pass\n", "path": "conda/lock.py"}]}