Initial

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

vendor/github.com/Microsoft/hcsshim/internal/wclayer/activatelayer.go

@@ -0,0 +1,32 @@
+package wclayer
+
+import (
+	"github.com/Microsoft/hcsshim/internal/hcserror"
+	"github.com/sirupsen/logrus"
+)
+
+// ActivateLayer will find the layer with the given id and mount it's filesystem.
+// For a read/write layer, the mounted filesystem will appear as a volume on the
+// host, while a read-only layer is generally expected to be a no-op.
+// An activated layer must later be deactivated via DeactivateLayer.
+func ActivateLayer(path string) (err error) {
+	title := "hcsshim::ActivateLayer"
+	fields := logrus.Fields{
+		"path": path,
+	}
+	logrus.WithFields(fields).Debug(title)
+	defer func() {
+		if err != nil {
+			fields[logrus.ErrorKey] = err
+			logrus.WithFields(fields).Error(err)
+		} else {
+			logrus.WithFields(fields).Debug(title + " - succeeded")
+		}
+	}()
+
+	err = activateLayer(&stdDriverInfo, path)
+	if err != nil {
+		return hcserror.New(err, title+" - failed", "")
+	}
+	return nil
+}