6b3a6e6b98
Instead of saying "Google Inc." (which is not always correct) say "The Kubernetes Authors", which is generic.
146 lines
3.0 KiB
Go
146 lines
3.0 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"flag"
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"fmt"
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"io/ioutil"
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"os"
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"syscall"
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)
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var (
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fsTypePath = ""
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fileModePath = ""
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readFileContentPath = ""
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readWriteNewFilePath = ""
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)
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func init() {
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flag.StringVar(&fsTypePath, "fs_type", "", "Path to print the fs type for")
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flag.StringVar(&fileModePath, "file_mode", "", "Path to print the filemode of")
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flag.StringVar(&readFileContentPath, "file_content", "", "Path to read the file content from")
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flag.StringVar(&readWriteNewFilePath, "rw_new_file", "", "Path to write to and read from")
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}
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// This program performs some tests on the filesystem as dictated by the
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// flags passed by the user.
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func main() {
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flag.Parse()
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var (
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err error
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errs = []error{}
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)
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err = fsType(fsTypePath)
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if err != nil {
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errs = append(errs, err)
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}
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err = readWriteNewFile(readWriteNewFilePath)
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if err != nil {
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errs = append(errs, err)
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}
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err = fileMode(fileModePath)
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if err != nil {
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errs = append(errs, err)
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}
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err = readFileContent(readFileContentPath)
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if err != nil {
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errs = append(errs, err)
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}
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if len(errs) != 0 {
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os.Exit(1)
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}
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os.Exit(0)
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}
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// Defined by Linux (sys/statfs.h) - the type number for tmpfs mounts.
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const linuxTmpfsMagic = 0x01021994
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func fsType(path string) error {
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if path == "" {
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return nil
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}
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buf := syscall.Statfs_t{}
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if err := syscall.Statfs(path, &buf); err != nil {
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fmt.Printf("error from statfs(%q): %v", path, err)
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return err
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}
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if buf.Type == linuxTmpfsMagic {
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fmt.Printf("mount type of %q: tmpfs\n", path)
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} else {
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fmt.Printf("mount type of %q: %v\n", path, buf.Type)
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}
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return nil
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}
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func fileMode(path string) error {
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if path == "" {
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return nil
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}
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fileinfo, err := os.Lstat(path)
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if err != nil {
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fmt.Printf("error from Lstat(%q): %v\n", path, err)
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return err
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}
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fmt.Printf("mode of file %q: %v\n", path, fileinfo.Mode())
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return nil
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}
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func readFileContent(path string) error {
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if path == "" {
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return nil
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}
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contentBytes, err := ioutil.ReadFile(path)
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if err != nil {
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fmt.Printf("error reading file content for %q: %v\n", path, err)
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return err
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}
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fmt.Printf("content of file %q: %v\n", path, string(contentBytes))
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return nil
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}
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func readWriteNewFile(path string) error {
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if path == "" {
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return nil
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}
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content := "mount-tester new file\n"
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err := ioutil.WriteFile(path, []byte(content), 0644)
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if err != nil {
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fmt.Printf("error writing new file %q: %v\n", path, err)
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return err
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}
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return readFileContent(path)
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}
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