Vendor: Update k8s version

Signed-off-by: Michał Żyłowski <michal.zylowski@intel.com>

vendor/k8s.io/kubernetes/pkg/util/tail/BUILD

@@ -0,0 +1,35 @@
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_library",
+    "go_test",
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["tail_test.go"],
+    library = ":go_default_library",
+    tags = ["automanaged"],
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = ["tail.go"],
+    tags = ["automanaged"],
+)

vendor/k8s.io/kubernetes/pkg/util/tail/tail.go

@@ -0,0 +1,99 @@
+/*
+Copyright 2017 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 tail
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"os"
+)
+
+const (
+	// blockSize is the block size used in tail.
+	blockSize = 1024
+)
+
+var (
+	// eol is the end-of-line sign in the log.
+	eol = []byte{'\n'}
+)
+
+// ReadAtMost reads at most max bytes from the end of the file identified by path or
+// returns an error. It returns true if the file was longer than max. It will
+// allocate up to max bytes.
+func ReadAtMost(path string, max int64) ([]byte, bool, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, false, err
+	}
+	defer f.Close()
+	fi, err := f.Stat()
+	if err != nil {
+		return nil, false, err
+	}
+	size := fi.Size()
+	if size == 0 {
+		return nil, false, nil
+	}
+	if size < max {
+		max = size
+	}
+	offset, err := f.Seek(-max, os.SEEK_END)
+	if err != nil {
+		return nil, false, err
+	}
+	data, err := ioutil.ReadAll(f)
+	return data, offset > 0, err
+}
+
+// FindTailLineStartIndex returns the start of last nth line.
+// * If n < 0, return the beginning of the file.
+// * If n >= 0, return the beginning of last nth line.
+// Notice that if the last line is incomplete (no end-of-line), it will not be counted
+// as one line.
+func FindTailLineStartIndex(f io.ReadSeeker, n int64) (int64, error) {
+	if n < 0 {
+		return 0, nil
+	}
+	size, err := f.Seek(0, os.SEEK_END)
+	if err != nil {
+		return 0, err
+	}
+	var left, cnt int64
+	buf := make([]byte, blockSize)
+	for right := size; right > 0 && cnt <= n; right -= blockSize {
+		left = right - blockSize
+		if left < 0 {
+			left = 0
+			buf = make([]byte, right)
+		}
+		if _, err := f.Seek(left, os.SEEK_SET); err != nil {
+			return 0, err
+		}
+		if _, err := f.Read(buf); err != nil {
+			return 0, err
+		}
+		cnt += int64(bytes.Count(buf, eol))
+	}
+	for ; cnt > n; cnt-- {
+		idx := bytes.Index(buf, eol) + 1
+		buf = buf[idx:]
+		left += int64(idx)
+	}
+	return left, nil
+}

vendor/k8s.io/kubernetes/pkg/util/tail/tail_test.go

@@ -0,0 +1,52 @@
+/*
+Copyright 2016 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 tail
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+)
+
+func TestTail(t *testing.T) {
+	line := strings.Repeat("a", blockSize)
+	testBytes := []byte(line + "\n" +
+		line + "\n" +
+		line + "\n" +
+		line + "\n" +
+		line[blockSize/2:]) // incomplete line
+
+	for c, test := range []struct {
+		n     int64
+		start int64
+	}{
+		{n: -1, start: 0},
+		{n: 0, start: int64(len(line)+1) * 4},
+		{n: 1, start: int64(len(line)+1) * 3},
+		{n: 9999, start: 0},
+	} {
+		t.Logf("TestCase #%d: %+v", c, test)
+		r := bytes.NewReader(testBytes)
+		s, err := FindTailLineStartIndex(r, test.n)
+		if err != nil {
+			t.Error(err)
+		}
+		if s != test.start {
+			t.Errorf("%d != %d", s, test.start)
+		}
+	}
+}