/usr/share/gocode/src/github.com/tendermint/go-common/os.go is in golang-github-tendermint-go-common-dev 0~20161202~0gitf40b1b6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | package common
import (
"bufio"
"fmt"
"io/ioutil"
"os"
"os/signal"
"strings"
)
var (
GoPath = os.Getenv("GOPATH")
)
func TrapSignal(cb func()) {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
signal.Notify(c, os.Kill)
go func() {
for sig := range c {
fmt.Printf("captured %v, exiting...\n", sig)
if cb != nil {
cb()
}
os.Exit(1)
}
}()
select {}
}
func Exit(s string) {
fmt.Printf(s + "\n")
os.Exit(1)
}
func EnsureDir(dir string, mode os.FileMode) error {
if _, err := os.Stat(dir); os.IsNotExist(err) {
err := os.MkdirAll(dir, mode)
if err != nil {
return fmt.Errorf("Could not create directory %v. %v", dir, err)
}
}
return nil
}
func FileExists(filePath string) bool {
_, err := os.Stat(filePath)
return !os.IsNotExist(err)
}
func ReadFile(filePath string) ([]byte, error) {
return ioutil.ReadFile(filePath)
}
func MustReadFile(filePath string) []byte {
fileBytes, err := ioutil.ReadFile(filePath)
if err != nil {
Exit(Fmt("MustReadFile failed: %v", err))
return nil
}
return fileBytes
}
func WriteFile(filePath string, contents []byte, mode os.FileMode) error {
err := ioutil.WriteFile(filePath, contents, mode)
if err != nil {
return err
}
// fmt.Printf("File written to %v.\n", filePath)
return nil
}
func MustWriteFile(filePath string, contents []byte, mode os.FileMode) {
err := WriteFile(filePath, contents, mode)
if err != nil {
Exit(Fmt("MustWriteFile failed: %v", err))
}
}
// Writes to newBytes to filePath.
// Guaranteed not to lose *both* oldBytes and newBytes,
// (assuming that the OS is perfect)
func WriteFileAtomic(filePath string, newBytes []byte, mode os.FileMode) error {
// If a file already exists there, copy to filePath+".bak" (overwrite anything)
if _, err := os.Stat(filePath); !os.IsNotExist(err) {
fileBytes, err := ioutil.ReadFile(filePath)
if err != nil {
return fmt.Errorf("Could not read file %v. %v", filePath, err)
}
err = ioutil.WriteFile(filePath+".bak", fileBytes, mode)
if err != nil {
return fmt.Errorf("Could not write file %v. %v", filePath+".bak", err)
}
}
// Write newBytes to filePath.new
err := ioutil.WriteFile(filePath+".new", newBytes, mode)
if err != nil {
return fmt.Errorf("Could not write file %v. %v", filePath+".new", err)
}
// Move filePath.new to filePath
err = os.Rename(filePath+".new", filePath)
return err
}
//--------------------------------------------------------------------------------
func Tempfile(prefix string) (*os.File, string) {
file, err := ioutil.TempFile("", prefix)
if err != nil {
PanicCrisis(err)
}
return file, file.Name()
}
func Tempdir(prefix string) (*os.File, string) {
tempDir := os.TempDir() + "/" + prefix + RandStr(12)
err := EnsureDir(tempDir, 0700)
if err != nil {
panic(Fmt("Error creating temp dir: %v", err))
}
dir, err := os.Open(tempDir)
if err != nil {
panic(Fmt("Error opening temp dir: %v", err))
}
return dir, tempDir
}
//--------------------------------------------------------------------------------
func Prompt(prompt string, defaultValue string) (string, error) {
fmt.Print(prompt)
reader := bufio.NewReader(os.Stdin)
line, err := reader.ReadString('\n')
if err != nil {
return defaultValue, err
} else {
line = strings.TrimSpace(line)
if line == "" {
return defaultValue, nil
}
return line, nil
}
}
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