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diff --git a/vendor/github.com/hpcloud/tail/watch/watch.go b/vendor/github.com/hpcloud/tail/watch/watch.go
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+// Copyright (c) 2015 HPE Software Inc. All rights reserved.
+// Copyright (c) 2013 ActiveState Software Inc. All rights reserved.
+
+package watch
+
+import "gopkg.in/tomb.v1"
+
+// FileWatcher monitors file-level events.
+type FileWatcher interface {
+ // BlockUntilExists blocks until the file comes into existence.
+ BlockUntilExists(*tomb.Tomb) error
+
+ // ChangeEvents reports on changes to a file, be it modification,
+ // deletion, renames or truncations. Returned FileChanges group of
+ // channels will be closed, thus become unusable, after a deletion
+ // or truncation event.
+ // In order to properly report truncations, ChangeEvents requires
+ // the caller to pass their current offset in the file.
+ ChangeEvents(*tomb.Tomb, int64) (*FileChanges, error)
+}