vendor files

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

@@ -0,0 +1,29 @@
+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_library",
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "consistentread.go",
+        "writer.go",
+    ],
+    importpath = "k8s.io/kubernetes/pkg/util/io",
+    deps = ["//vendor/github.com/golang/glog:go_default_library"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+)

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

@@ -0,0 +1,45 @@
+/*
+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 io
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+)
+
+// ConsistentRead repeatedly reads a file until it gets the same content twice.
+// This is useful when reading files in /proc that are larger than page size
+// and kernel may modify them between individual read() syscalls.
+func ConsistentRead(filename string, attempts int) ([]byte, error) {
+	oldContent, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+	for i := 0; i < attempts; i++ {
+		newContent, err := ioutil.ReadFile(filename)
+		if err != nil {
+			return nil, err
+		}
+		if bytes.Compare(oldContent, newContent) == 0 {
+			return newContent, nil
+		}
+		// Files are different, continue reading
+		oldContent = newContent
+	}
+	return nil, fmt.Errorf("could not get consistent content of %s after %d attempts", filename, attempts)
+}

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

@@ -0,0 +1,82 @@
+/*
+Copyright 2015 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 io
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+
+	"github.com/golang/glog"
+)
+
+// Writer is an interface which allows to write data to a file.
+type Writer interface {
+	// WriteFile mimics ioutil.WriteFile.
+	WriteFile(filename string, data []byte, perm os.FileMode) error
+}
+
+// StdWriter implements Writer interface and uses standard libraries
+// for writing data to files.
+type StdWriter struct {
+}
+
+// WriteFile directly calls ioutil.WriteFile.
+func (writer *StdWriter) WriteFile(filename string, data []byte, perm os.FileMode) error {
+	return ioutil.WriteFile(filename, data, perm)
+}
+
+// NsenterWriter is implementation of Writer interface that allows writing data
+// to file using nsenter command.
+// If a program (e.g. kubelet) runs in a container it may want to write data to
+// a mounted device. Since in Docker, mount propagation mode is set to private,
+// it will not see the mounted device in its own namespace. To work around this
+// limitation one has to first enter hosts namespace (by using 'nsenter') and
+// only then write data.
+type NsenterWriter struct{}
+
+// WriteFile calls 'nsenter cat - > <the file>' and 'nsenter chmod' to create a
+// file on the host.
+func (writer *NsenterWriter) WriteFile(filename string, data []byte, perm os.FileMode) error {
+	cmd := "nsenter"
+	baseArgs := []string{
+		"--mount=/rootfs/proc/1/ns/mnt",
+		"--",
+	}
+
+	echoArgs := append(baseArgs, "sh", "-c", fmt.Sprintf("cat > %s", filename))
+	glog.V(5).Infof("Command to write data to file: %v %v", cmd, echoArgs)
+	command := exec.Command(cmd, echoArgs...)
+	command.Stdin = bytes.NewBuffer(data)
+	outputBytes, err := command.CombinedOutput()
+	if err != nil {
+		glog.Errorf("Output from writing to %q: %v", filename, string(outputBytes))
+		return err
+	}
+
+	chmodArgs := append(baseArgs, "chmod", fmt.Sprintf("%o", perm), filename)
+	glog.V(5).Infof("Command to change permissions to file: %v %v", cmd, chmodArgs)
+	outputBytes, err = exec.Command(cmd, chmodArgs...).CombinedOutput()
+	if err != nil {
+		glog.Errorf("Output from chmod command: %v", string(outputBytes))
+		return err
+	}
+
+	return nil
+}