1 files changed, 59 insertions, 0 deletions
diff --git a/vendor/github.com/containernetworking/plugins/plugins/ipam/host-local/backend/disk/lock.go b/vendor/github.com/containernetworking/plugins/plugins/ipam/host-local/backend/disk/lock.go
new file mode 100644
index 0000000..fe7b480
--- /dev/null
+++ b/vendor/github.com/containernetworking/plugins/plugins/ipam/host-local/backend/disk/lock.go
@@ -0,0 +1,59 @@
+// Copyright 2015 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package disk
+
+import (
+	"github.com/alexflint/go-filemutex"
+	"os"
+	"path"
+)
+
+// FileLock wraps os.File to be used as a lock using flock
+type FileLock struct {
+	f *filemutex.FileMutex
+}
+
+// NewFileLock opens file/dir at path and returns unlocked FileLock object
+func NewFileLock(lockPath string) (*FileLock, error) {
+	fi, err := os.Stat(lockPath)
+	if err != nil {
+		return nil, err
+	}
+
+	if fi.IsDir() {
+		lockPath = path.Join(lockPath, "lock")
+	}
+
+	f, err := filemutex.New(lockPath)
+	if err != nil {
+		return nil, err
+	}
+
+	return &FileLock{f}, nil
+}
+
+func (l *FileLock) Close() error {
+	return l.f.Close()
+}
+
+// Lock acquires an exclusive lock
+func (l *FileLock) Lock() error {
+	return l.f.Lock()
+}
+
+// Unlock releases the lock
+func (l *FileLock) Unlock() error {
+	return l.f.Unlock()
+}