Update vendor

(cherry picked from commit 7e84f96c0f)

vendor/github.com/prometheus/procfs/fs.go

@@ -0,0 +1,43 @@
+// Copyright 2018 The Prometheus 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 procfs
+
+import (
+	"github.com/prometheus/procfs/internal/fs"
+)
+
+// FS represents the pseudo-filesystem sys, which provides an interface to
+// kernel data structures.
+type FS struct {
+	proc fs.FS
+}
+
+// DefaultMountPoint is the common mount point of the proc filesystem.
+const DefaultMountPoint = fs.DefaultProcMountPoint
+
+// NewDefaultFS returns a new proc FS mounted under the default proc mountPoint.
+// It will error if the mount point directory can't be read or is a file.
+func NewDefaultFS() (FS, error) {
+	return NewFS(DefaultMountPoint)
+}
+
+// NewFS returns a new proc FS mounted under the given proc mountPoint. It will error
+// if the mount point directory can't be read or is a file.
+func NewFS(mountPoint string) (FS, error) {
+	fs, err := fs.NewFS(mountPoint)
+	if err != nil {
+		return FS{}, err
+	}
+	return FS{fs}, nil
+}