{"action":"created","comment":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/52077122","id":52077122,"diff_hunk":"@@ -0,0 +1,391 @@\n+/*\n+Copyright 2016 The Kubernetes Authors All rights reserved.\n+\n+Licensed under the Apache License, Version 2.0 (the \"License\");\n+you may not use this file except in compliance with the License.\n+You may obtain a copy of the License at\n+\n+    http://www.apache.org/licenses/LICENSE-2.0\n+\n+Unless required by applicable law or agreed to in writing, software\n+distributed under the License is distributed on an \"AS IS\" BASIS,\n+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+See the License for the specific language governing permissions and\n+limitations under the License.\n+*/\n+\n+package util\n+\n+import (\n+\t\"bytes\"\n+\t\"fmt\"\n+\t\"io/ioutil\"\n+\t\"os\"\n+\t\"path\"\n+\t\"path/filepath\"\n+\t\"strings\"\n+\t\"time\"\n+\n+\t\"github.com/golang/glog\"\n+\n+\t\"k8s.io/kubernetes/pkg/util/sets\"\n+)\n+\n+// AtomicWriter handles atomically projecting content for a set of files into\n+// a target directory.  AtomicWriter maintains a sentinel file named\n+// \"..sentinel\" in the target directory which is updated after new data is\n+// projected into the target directory, allowing consumers of the data to\n+// listen for updates by monitoring the sentinel file with inotify or\n+// fanotify.\n+//\n+// The visible files in this volume are symlinks to files in the writer's data\n+// directory.  Actual files are stored in a hidden timestamped directory which\n+// is symlinked to by the data directory. The timestamped directory and\n+// data directory symlink are created in the writer's target dir.  This scheme\n+// allows the files to be atomically updated by changing the target of the\n+// data directory symlink.\n+type AtomicWriter struct {\n+\tTargetDir  string\n+\tLogContext string\n+}\n+\n+func NewAtomicWriter(targetDir, podNamespace, podName, volumeName string) (*AtomicWriter, error) 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