build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/k8s.io/klog/v2/internal/buffer/buffer.go

@@ -0,0 +1,184 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+// Copyright 2022 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 buffer provides a cache for byte.Buffer instances that can be reused
+// to avoid frequent allocation and deallocation. It also has utility code
+// for log header formatting that use these buffers.
+package buffer
+
+import (
+	"bytes"
+	"os"
+	"sync"
+	"time"
+
+	"k8s.io/klog/v2/internal/severity"
+)
+
+var (
+	// Pid is inserted into log headers. Can be overridden for tests.
+	Pid = os.Getpid()
+
+	// Time, if set, will be used instead of the actual current time.
+	Time *time.Time
+)
+
+// Buffer holds a single byte.Buffer for reuse. The zero value is ready for
+// use. It also provides some helper methods for output formatting.
+type Buffer struct {
+	bytes.Buffer
+	Tmp [64]byte // temporary byte array for creating headers.
+}
+
+var buffers = sync.Pool{
+	New: func() interface{} {
+		return new(Buffer)
+	},
+}
+
+// GetBuffer returns a new, ready-to-use buffer.
+func GetBuffer() *Buffer {
+	b := buffers.Get().(*Buffer)
+	b.Reset()
+	return b
+}
+
+// PutBuffer returns a buffer to the free list.
+func PutBuffer(b *Buffer) {
+	if b.Len() >= 256 {
+		// Let big buffers die a natural death, without relying on
+		// sync.Pool behavior. The documentation implies that items may
+		// get deallocated while stored there ("If the Pool holds the
+		// only reference when this [= be removed automatically]
+		// happens, the item might be deallocated."), but
+		// https://github.com/golang/go/issues/23199 leans more towards
+		// having such a size limit.
+		return
+	}
+
+	buffers.Put(b)
+}
+
+// Some custom tiny helper functions to print the log header efficiently.
+
+const digits = "0123456789"
+
+// twoDigits formats a zero-prefixed two-digit integer at buf.Tmp[i].
+func (buf *Buffer) twoDigits(i, d int) {
+	buf.Tmp[i+1] = digits[d%10]
+	d /= 10
+	buf.Tmp[i] = digits[d%10]
+}
+
+// nDigits formats an n-digit integer at buf.Tmp[i],
+// padding with pad on the left.
+// It assumes d >= 0.
+func (buf *Buffer) nDigits(n, i, d int, pad byte) {
+	j := n - 1
+	for ; j >= 0 && d > 0; j-- {
+		buf.Tmp[i+j] = digits[d%10]
+		d /= 10
+	}
+	for ; j >= 0; j-- {
+		buf.Tmp[i+j] = pad
+	}
+}
+
+// someDigits formats a zero-prefixed variable-width integer at buf.Tmp[i].
+func (buf *Buffer) someDigits(i, d int) int {
+	// Print into the top, then copy down. We know there's space for at least
+	// a 10-digit number.
+	j := len(buf.Tmp)
+	for {
+		j--
+		buf.Tmp[j] = digits[d%10]
+		d /= 10
+		if d == 0 {
+			break
+		}
+	}
+	return copy(buf.Tmp[i:], buf.Tmp[j:])
+}
+
+// FormatHeader formats a log header using the provided file name and line number
+// and writes it into the buffer.
+func (buf *Buffer) FormatHeader(s severity.Severity, file string, line int, now time.Time) {
+	if line < 0 {
+		line = 0 // not a real line number, but acceptable to someDigits
+	}
+	if s > severity.FatalLog {
+		s = severity.InfoLog // for safety.
+	}
+
+	// Avoid Fprintf, for speed. The format is so simple that we can do it quickly by hand.
+	// It's worth about 3X. Fprintf is hard.
+	if Time != nil {
+		now = *Time
+	}
+	_, month, day := now.Date()
+	hour, minute, second := now.Clock()
+	// Lmmdd hh:mm:ss.uuuuuu threadid file:line]
+	buf.Tmp[0] = severity.Char[s]
+	buf.twoDigits(1, int(month))
+	buf.twoDigits(3, day)
+	buf.Tmp[5] = ' '
+	buf.twoDigits(6, hour)
+	buf.Tmp[8] = ':'
+	buf.twoDigits(9, minute)
+	buf.Tmp[11] = ':'
+	buf.twoDigits(12, second)
+	buf.Tmp[14] = '.'
+	buf.nDigits(6, 15, now.Nanosecond()/1000, '0')
+	buf.Tmp[21] = ' '
+	buf.nDigits(7, 22, Pid, ' ') // TODO: should be TID
+	buf.Tmp[29] = ' '
+	buf.Write(buf.Tmp[:30])
+	buf.WriteString(file)
+	buf.Tmp[0] = ':'
+	n := buf.someDigits(1, line)
+	buf.Tmp[n+1] = ']'
+	buf.Tmp[n+2] = ' '
+	buf.Write(buf.Tmp[:n+3])
+}
+
+// SprintHeader formats a log header and returns a string. This is a simpler
+// version of FormatHeader for use in ktesting.
+func (buf *Buffer) SprintHeader(s severity.Severity, now time.Time) string {
+	if s > severity.FatalLog {
+		s = severity.InfoLog // for safety.
+	}
+
+	// Avoid Fprintf, for speed. The format is so simple that we can do it quickly by hand.
+	// It's worth about 3X. Fprintf is hard.
+	if Time != nil {
+		now = *Time
+	}
+	_, month, day := now.Date()
+	hour, minute, second := now.Clock()
+	// Lmmdd hh:mm:ss.uuuuuu threadid file:line]
+	buf.Tmp[0] = severity.Char[s]
+	buf.twoDigits(1, int(month))
+	buf.twoDigits(3, day)
+	buf.Tmp[5] = ' '
+	buf.twoDigits(6, hour)
+	buf.Tmp[8] = ':'
+	buf.twoDigits(9, minute)
+	buf.Tmp[11] = ':'
+	buf.twoDigits(12, second)
+	buf.Tmp[14] = '.'
+	buf.nDigits(6, 15, now.Nanosecond()/1000, '0')
+	buf.Tmp[21] = ']'
+	return string(buf.Tmp[:22])
+}