Vendor in latest k8s.io changes

These changes allow for the container's pid namespace to be set to the same
as the pod infra container's namespace if the pid namespace mode is set to POD

Signed-off-by: umohnani8 <umohnani@redhat.com>

vendor/k8s.io/kubernetes/pkg/volume/util/fs/fs.go

@@ -0,0 +1,97 @@
+// +build linux darwin
+
+/*
+Copyright 2014 The Kubernetes 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 fs
+
+import (
+	"bytes"
+	"fmt"
+	"os/exec"
+	"strings"
+
+	"golang.org/x/sys/unix"
+
+	"k8s.io/apimachinery/pkg/api/resource"
+)
+
+// FSInfo linux returns (available bytes, byte capacity, byte usage, total inodes, inodes free, inode usage, error)
+// for the filesystem that path resides upon.
+func FsInfo(path string) (int64, int64, int64, int64, int64, int64, error) {
+	statfs := &unix.Statfs_t{}
+	err := unix.Statfs(path, statfs)
+	if err != nil {
+		return 0, 0, 0, 0, 0, 0, err
+	}
+
+	// Available is blocks available * fragment size
+	available := int64(statfs.Bavail) * int64(statfs.Bsize)
+
+	// Capacity is total block count * fragment size
+	capacity := int64(statfs.Blocks) * int64(statfs.Bsize)
+
+	// Usage is block being used * fragment size (aka block size).
+	usage := (int64(statfs.Blocks) - int64(statfs.Bfree)) * int64(statfs.Bsize)
+
+	inodes := int64(statfs.Files)
+	inodesFree := int64(statfs.Ffree)
+	inodesUsed := inodes - inodesFree
+
+	return available, capacity, usage, inodes, inodesFree, inodesUsed, nil
+}
+
+func Du(path string) (*resource.Quantity, error) {
+	// Uses the same niceness level as cadvisor.fs does when running du
+	// Uses -B 1 to always scale to a blocksize of 1 byte
+	out, err := exec.Command("nice", "-n", "19", "du", "-s", "-B", "1", path).CombinedOutput()
+	if err != nil {
+		return nil, fmt.Errorf("failed command 'du' ($ nice -n 19 du -s -B 1) on path %s with error %v", path, err)
+	}
+	used, err := resource.ParseQuantity(strings.Fields(string(out))[0])
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse 'du' output %s due to error %v", out, err)
+	}
+	used.Format = resource.BinarySI
+	return &used, nil
+}
+
+// Find uses the equivalent of the command `find <path> -dev -printf '.' | wc -c` to count files and directories.
+// While this is not an exact measure of inodes used, it is a very good approximation.
+func Find(path string) (int64, error) {
+	if path == "" {
+		return 0, fmt.Errorf("invalid directory")
+	}
+	var counter byteCounter
+	var stderr bytes.Buffer
+	findCmd := exec.Command("find", path, "-xdev", "-printf", ".")
+	findCmd.Stdout, findCmd.Stderr = &counter, &stderr
+	if err := findCmd.Start(); err != nil {
+		return 0, fmt.Errorf("failed to exec cmd %v - %v; stderr: %v", findCmd.Args, err, stderr.String())
+	}
+	if err := findCmd.Wait(); err != nil {
+		return 0, fmt.Errorf("cmd %v failed. stderr: %s; err: %v", findCmd.Args, stderr.String(), err)
+	}
+	return counter.bytesWritten, nil
+}
+
+// Simple io.Writer implementation that counts how many bytes were written.
+type byteCounter struct{ bytesWritten int64 }
+
+func (b *byteCounter) Write(p []byte) (int, error) {
+	b.bytesWritten += int64(len(p))
+	return len(p), nil
+}