prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Use dvc to store images for windows installer in our repo
  We currently have 3 images stored in git in scripts/innosetup. We should start using dvc for them. Required for https://github.com/iterative/dvc/issues/735 . Depends on https://github.com/iterative/dvc/issues/785 .
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `dvc/remote/base.py`
  Content:
  ```
  1 import os
  2 import re
  3 import tempfile
  4 
  5 from dvc.config import Config
  6 from dvc.logger import Logger
  7 from dvc.exceptions import DvcException
  8 
  9 
  10 STATUS_UNKNOWN = 0
  11 STATUS_OK = 1
  12 STATUS_MODIFIED = 2
  13 STATUS_NEW = 3
  14 STATUS_DELETED = 4
  15 
  16 
  17 STATUS_MAP = {
  18     # (local_exists, remote_exists, cmp)
  19     (True, True, True)  : STATUS_OK,
  20     (True, True, False) : STATUS_MODIFIED,
  21     (True, False, None) : STATUS_NEW,
  22     (False, True, None) : STATUS_DELETED,
  23 }
  24 
  25 
  26 class DataCloudError(DvcException):
  27     """ Data Cloud exception """
  28     def __init__(self, msg):
  29         super(DataCloudError, self).__init__('Data sync error: {}'.format(msg))
  30 
  31 
  32 
  33 class RemoteBase(object):
  34     REGEX = None
  35 
  36     def __init__(self, project, config):
  37         pass
  38 
  39     @classmethod
  40     def supported(cls, config):
  41         url = config[Config.SECTION_REMOTE_URL]
  42         return cls.match(url) != None
  43 
  44     @classmethod
  45     def match(cls, url):
  46         return re.match(cls.REGEX, url)
  47 
  48     def save_info(self, path_info):
  49         raise NotImplementedError
  50 
  51     def save(self, path_info):
  52         raise NotImplementedError
  53 
  54     def checkout(self, path_info, checksum_info):
  55         raise NotImplementedError
  56 
  57     def download(self, path_info, path):
  58         raise NotImplementedError
  59 
  60     def upload(self, path, path_info):
  61         raise NotImplementedError
  62 
  63     # Old code starting from here
  64 
  65     def cache_file_key(self, fname):
  66         """ Key of a file within the bucket """
  67         relpath = os.path.relpath(fname, self.project.cache.local.cache_dir)
  68         relpath = relpath.replace('\\', '/')
  69         return '{}/{}'.format(self.prefix, relpath).strip('/')
  70 
  71     def cache_key_name(self, path):
  72         relpath = os.path.relpath(path, self.project.cache.local.cache_dir)
  73         return relpath.replace('\\', '').replace('/', '')
  74 
  75     @staticmethod
  76     def tmp_file(fname):
  77         """ Temporary name for a partial download """
  78         return fname + '.part'
  79 
  80     def _push_key(self, key, path):
  81         pass
  82 
  83     def collect(self, arg):
  84         from dvc.remote.local import RemoteLOCAL
  85 
  86         path, local = arg
  87         ret = [path]
  88 
  89         if not RemoteLOCAL.is_dir_cache(path):
  90             return ret
  91 
  92         if local:
  93             if not os.path.isfile(path):
  94                 return ret
  95             dir_path = path
  96         else:
  97             key = self._get_key(path)
  98             if not key:
  99                 Logger.debug("File '{}' does not exist in the cloud".format(path))
  100                 return ret
  101             tmp = os.path.join(tempfile.mkdtemp(), os.path.basename(path))
  102             self._pull_key(key, tmp, no_progress_bar=True)
  103             dir_path = tmp
  104 
  105         for relpath, md5 in RemoteLOCAL.get_dir_cache(dir_path).items():
  106             cache = self.project.cache.local.get(md5)
  107             ret.append(cache)
  108 
  109         return ret
  110 
  111     def _cmp_checksum(self, blob, fname):
  112         md5 = self.project.cache.local.path_to_md5(fname)
  113         if self.project.cache.local.state.changed(fname, md5=md5):
  114             return False
  115 
  116         return True
  117 
  118     def push(self, path):
  119         key = self._get_key(path)
  120         if key:
  121             Logger.debug("File '{}' already uploaded to the cloud. Validating checksum...".format(path))
  122             if self._cmp_checksum(key, path):
  123                 Logger.debug('File checksum matches. No uploading is needed.')
  124                 return []
  125             Logger.debug('Checksum mismatch. Reuploading is required.')
  126 
  127         key = self._new_key(path)
  128         return self._push_key(key, path)
  129 
  130     def _makedirs(self, fname):
  131         dname = os.path.dirname(fname)
  132         try:
  133             os.makedirs(dname)
  134         except OSError as e:
  135             if e.errno != os.errno.EEXIST:
  136                 raise
  137 
  138     def _pull_key(self, key, path, no_progress_bar=False):
  139         """ Cloud-specific method of pulling keys """
  140         pass
  141 
  142     def _get_key(self, path):
  143         """ Cloud-specific method of getting keys """
  144         pass
  145 
  146     def pull(self, path):
  147         """ Generic method for pulling data from the cloud """
  148         key = self._get_key(path)
  149         if not key:
  150             Logger.error("File '{}' does not exist in the cloud".format(path))
  151             return None
  152 
  153         return self._pull_key(key, path)
  154 
  155     def _status(self, key, path):
  156         remote_exists = key != None
  157         local_exists = os.path.exists(path)
  158 
  159         diff = None
  160         if remote_exists and local_exists:
  161             diff = self._cmp_checksum(key, path)
  162 
  163         return STATUS_MAP.get((local_exists, remote_exists, diff), STATUS_UNKNOWN)
  164 
  165     def status(self, path):
  166         """
  167         Generic method for checking data item status.
  168         """
  169         key = self._get_key(path)
  170         if not key:
  171             return STATUS_NEW
  172 
  173         return self._status(key, path)
  174 
  175     def connect(self):
  176         pass
  177 
  178     def disconnect(self):
  179         pass
  180 
  181     def __enter__(self):
  182         self.connect()
  183 
  184     def __exit__(self, type, value, tb):
  185         self.disconnect()
  186
  ```
  --- 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/dvc/remote/base.py b/dvc/remote/base.py
  --- a/dvc/remote/base.py
  +++ b/dvc/remote/base.py
  @@ -1,6 +1,7 @@
   import os
   import re
   import tempfile
  +import posixpath
   
   from dvc.config import Config
   from dvc.logger import Logger
  @@ -66,7 +67,7 @@
           """ Key of a file within the bucket """
           relpath = os.path.relpath(fname, self.project.cache.local.cache_dir)
           relpath = relpath.replace('\\', '/')
  -        return '{}/{}'.format(self.prefix, relpath).strip('/')
  +        return posixpath.join(self.prefix, relpath).strip('/')
   
       def cache_key_name(self, path):
           relpath = os.path.relpath(path, self.project.cache.local.cache_dir)
  
verification_info: {"golden_diff": "diff --git a/dvc/remote/base.py b/dvc/remote/base.py\n--- a/dvc/remote/base.py\n+++ b/dvc/remote/base.py\n@@ -1,6 +1,7 @@\n import os\n import re\n import tempfile\n+import posixpath\n \n from dvc.config import Config\n from dvc.logger import Logger\n@@ -66,7 +67,7 @@\n         \"\"\" Key of a file within the bucket \"\"\"\n         relpath = os.path.relpath(fname, self.project.cache.local.cache_dir)\n         relpath = relpath.replace('\\\\', '/')\n-        return '{}/{}'.format(self.prefix, relpath).strip('/')\n+        return posixpath.join(self.prefix, relpath).strip('/')\n \n     def cache_key_name(self, path):\n         relpath = os.path.relpath(path, self.project.cache.local.cache_dir)\n", "issue": "Use dvc to store images for windows installer in our repo\nWe currently have 3 images stored in git in scripts/innosetup. We should start using dvc for them. Required for https://github.com/iterative/dvc/issues/735 . Depends on https://github.com/iterative/dvc/issues/785 .\n", "before_files": [{"content": "import os\nimport re\nimport tempfile\n\nfrom dvc.config import Config\nfrom dvc.logger import Logger\nfrom dvc.exceptions import DvcException\n\n\nSTATUS_UNKNOWN = 0\nSTATUS_OK = 1\nSTATUS_MODIFIED = 2\nSTATUS_NEW = 3\nSTATUS_DELETED = 4\n\n\nSTATUS_MAP = {\n    # (local_exists, remote_exists, cmp)\n    (True, True, True)  : STATUS_OK,\n    (True, True, False) : STATUS_MODIFIED,\n    (True, False, None) : STATUS_NEW,\n    (False, True, None) : STATUS_DELETED,\n}\n\n\nclass DataCloudError(DvcException):\n    \"\"\" Data Cloud exception \"\"\"\n    def __init__(self, msg):\n        super(DataCloudError, self).__init__('Data sync error: {}'.format(msg))\n\n\n\nclass RemoteBase(object):\n    REGEX = None\n\n    def __init__(self, project, config):\n        pass\n\n    @classmethod\n    def supported(cls, config):\n        url = config[Config.SECTION_REMOTE_URL]\n        return cls.match(url) != None\n\n    @classmethod\n    def match(cls, url):\n        return re.match(cls.REGEX, url)\n\n    def save_info(self, path_info):\n        raise NotImplementedError\n\n    def save(self, path_info):\n        raise NotImplementedError\n\n    def checkout(self, path_info, checksum_info):\n        raise NotImplementedError\n\n    def download(self, path_info, path):\n        raise NotImplementedError\n\n    def upload(self, path, path_info):\n        raise NotImplementedError\n\n    # Old code starting from here\n\n    def cache_file_key(self, fname):\n        \"\"\" Key of a file within the bucket \"\"\"\n        relpath = os.path.relpath(fname, self.project.cache.local.cache_dir)\n        relpath = relpath.replace('\\\\', '/')\n        return '{}/{}'.format(self.prefix, relpath).strip('/')\n\n    def cache_key_name(self, path):\n        relpath = os.path.relpath(path, self.project.cache.local.cache_dir)\n        return relpath.replace('\\\\', '').replace('/', '')\n\n    @staticmethod\n    def tmp_file(fname):\n        \"\"\" Temporary name for a partial download \"\"\"\n        return fname + '.part'\n\n    def _push_key(self, key, path):\n        pass\n\n    def collect(self, arg):\n        from dvc.remote.local import RemoteLOCAL\n\n        path, local = arg\n        ret = [path]\n\n        if not RemoteLOCAL.is_dir_cache(path):\n            return ret\n\n        if local:\n            if not os.path.isfile(path):\n                return ret\n            dir_path = path\n        else:\n            key = self._get_key(path)\n            if not key:\n                Logger.debug(\"File '{}' does not exist in the cloud\".format(path))\n                return ret\n            tmp = os.path.join(tempfile.mkdtemp(), os.path.basename(path))\n            self._pull_key(key, tmp, no_progress_bar=True)\n            dir_path = tmp\n\n        for relpath, md5 in RemoteLOCAL.get_dir_cache(dir_path).items():\n            cache = self.project.cache.local.get(md5)\n            ret.append(cache)\n\n        return ret\n\n    def _cmp_checksum(self, blob, fname):\n        md5 = self.project.cache.local.path_to_md5(fname)\n        if self.project.cache.local.state.changed(fname, md5=md5):\n            return False\n\n        return True\n\n    def push(self, path):\n        key = self._get_key(path)\n        if key:\n            Logger.debug(\"File '{}' already uploaded to the cloud. Validating checksum...\".format(path))\n            if self._cmp_checksum(key, path):\n                Logger.debug('File checksum matches. No uploading is needed.')\n                return []\n            Logger.debug('Checksum mismatch. Reuploading is required.')\n\n        key = self._new_key(path)\n        return self._push_key(key, path)\n\n    def _makedirs(self, fname):\n        dname = os.path.dirname(fname)\n        try:\n            os.makedirs(dname)\n        except OSError as e:\n            if e.errno != os.errno.EEXIST:\n                raise\n\n    def _pull_key(self, key, path, no_progress_bar=False):\n        \"\"\" Cloud-specific method of pulling keys \"\"\"\n        pass\n\n    def _get_key(self, path):\n        \"\"\" Cloud-specific method of getting keys \"\"\"\n        pass\n\n    def pull(self, path):\n        \"\"\" Generic method for pulling data from the cloud \"\"\"\n        key = self._get_key(path)\n        if not key:\n            Logger.error(\"File '{}' does not exist in the cloud\".format(path))\n            return None\n\n        return self._pull_key(key, path)\n\n    def _status(self, key, path):\n        remote_exists = key != None\n        local_exists = os.path.exists(path)\n\n        diff = None\n        if remote_exists and local_exists:\n            diff = self._cmp_checksum(key, path)\n\n        return STATUS_MAP.get((local_exists, remote_exists, diff), STATUS_UNKNOWN)\n\n    def status(self, path):\n        \"\"\"\n        Generic method for checking data item status.\n        \"\"\"\n        key = self._get_key(path)\n        if not key:\n            return STATUS_NEW\n\n        return self._status(key, path)\n\n    def connect(self):\n        pass\n\n    def disconnect(self):\n        pass\n\n    def __enter__(self):\n        self.connect()\n\n    def __exit__(self, type, value, tb):\n        self.disconnect()\n", "path": "dvc/remote/base.py"}], "after_files": [{"content": "import os\nimport re\nimport tempfile\nimport posixpath\n\nfrom dvc.config import Config\nfrom dvc.logger import Logger\nfrom dvc.exceptions import DvcException\n\n\nSTATUS_UNKNOWN = 0\nSTATUS_OK = 1\nSTATUS_MODIFIED = 2\nSTATUS_NEW = 3\nSTATUS_DELETED = 4\n\n\nSTATUS_MAP = {\n    # (local_exists, remote_exists, cmp)\n    (True, True, True)  : STATUS_OK,\n    (True, True, False) : STATUS_MODIFIED,\n    (True, False, None) : STATUS_NEW,\n    (False, True, None) : STATUS_DELETED,\n}\n\n\nclass DataCloudError(DvcException):\n    \"\"\" Data Cloud exception \"\"\"\n    def __init__(self, msg):\n        super(DataCloudError, self).__init__('Data sync error: {}'.format(msg))\n\n\n\nclass RemoteBase(object):\n    REGEX = None\n\n    def __init__(self, project, config):\n        pass\n\n    @classmethod\n    def supported(cls, config):\n        url = config[Config.SECTION_REMOTE_URL]\n        return cls.match(url) != None\n\n    @classmethod\n    def match(cls, url):\n        return re.match(cls.REGEX, url)\n\n    def save_info(self, path_info):\n        raise NotImplementedError\n\n    def save(self, path_info):\n        raise NotImplementedError\n\n    def checkout(self, path_info, checksum_info):\n        raise NotImplementedError\n\n    def download(self, path_info, path):\n        raise NotImplementedError\n\n    def upload(self, path, path_info):\n        raise NotImplementedError\n\n    # Old code starting from here\n\n    def cache_file_key(self, fname):\n        \"\"\" Key of a file within the bucket \"\"\"\n        relpath = os.path.relpath(fname, self.project.cache.local.cache_dir)\n        relpath = relpath.replace('\\\\', '/')\n        return posixpath.join(self.prefix, relpath).strip('/')\n\n    def cache_key_name(self, path):\n        relpath = os.path.relpath(path, self.project.cache.local.cache_dir)\n        return relpath.replace('\\\\', '').replace('/', '')\n\n    @staticmethod\n    def tmp_file(fname):\n        \"\"\" Temporary name for a partial download \"\"\"\n        return fname + '.part'\n\n    def _push_key(self, key, path):\n        pass\n\n    def collect(self, arg):\n        from dvc.remote.local import RemoteLOCAL\n\n        path, local = arg\n        ret = [path]\n\n        if not RemoteLOCAL.is_dir_cache(path):\n            return ret\n\n        if local:\n            if not os.path.isfile(path):\n                return ret\n            dir_path = path\n        else:\n            key = self._get_key(path)\n            if not key:\n                Logger.debug(\"File '{}' does not exist in the cloud\".format(path))\n                return ret\n            tmp = os.path.join(tempfile.mkdtemp(), os.path.basename(path))\n            self._pull_key(key, tmp, no_progress_bar=True)\n            dir_path = tmp\n\n        for relpath, md5 in RemoteLOCAL.get_dir_cache(dir_path).items():\n            cache = self.project.cache.local.get(md5)\n            ret.append(cache)\n\n        return ret\n\n    def _cmp_checksum(self, blob, fname):\n        md5 = self.project.cache.local.path_to_md5(fname)\n        if self.project.cache.local.state.changed(fname, md5=md5):\n            return False\n\n        return True\n\n    def push(self, path):\n        key = self._get_key(path)\n        if key:\n            Logger.debug(\"File '{}' already uploaded to the cloud. Validating checksum...\".format(path))\n            if self._cmp_checksum(key, path):\n                Logger.debug('File checksum matches. No uploading is needed.')\n                return []\n            Logger.debug('Checksum mismatch. Reuploading is required.')\n\n        key = self._new_key(path)\n        return self._push_key(key, path)\n\n    def _makedirs(self, fname):\n        dname = os.path.dirname(fname)\n        try:\n            os.makedirs(dname)\n        except OSError as e:\n            if e.errno != os.errno.EEXIST:\n                raise\n\n    def _pull_key(self, key, path, no_progress_bar=False):\n        \"\"\" Cloud-specific method of pulling keys \"\"\"\n        pass\n\n    def _get_key(self, path):\n        \"\"\" Cloud-specific method of getting keys \"\"\"\n        pass\n\n    def pull(self, path):\n        \"\"\" Generic method for pulling data from the cloud \"\"\"\n        key = self._get_key(path)\n        if not key:\n            Logger.error(\"File '{}' does not exist in the cloud\".format(path))\n            return None\n\n        return self._pull_key(key, path)\n\n    def _status(self, key, path):\n        remote_exists = key != None\n        local_exists = os.path.exists(path)\n\n        diff = None\n        if remote_exists and local_exists:\n            diff = self._cmp_checksum(key, path)\n\n        return STATUS_MAP.get((local_exists, remote_exists, diff), STATUS_UNKNOWN)\n\n    def status(self, path):\n        \"\"\"\n        Generic method for checking data item status.\n        \"\"\"\n        key = self._get_key(path)\n        if not key:\n            return STATUS_NEW\n\n        return self._status(key, path)\n\n    def connect(self):\n        pass\n\n    def disconnect(self):\n        pass\n\n    def __enter__(self):\n        self.connect()\n\n    def __exit__(self, type, value, tb):\n        self.disconnect()\n", "path": "dvc/remote/base.py"}]}