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141 lines
2.9 KiB
141 lines
2.9 KiB
package util
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import (
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"bytes"
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"crypto/sha256"
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"errors"
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"fmt"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"os"
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"os/user"
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"path/filepath"
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"strings"
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"time"
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)
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const maxFilenameLength = 255
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func TestFolderWritable(folder string) (err error) {
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fileInfo, err := os.Stat(folder)
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if err != nil {
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return err
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}
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if !fileInfo.IsDir() {
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return errors.New("Not a valid folder!")
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}
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perm := fileInfo.Mode().Perm()
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glog.V(0).Infoln("Folder", folder, "Permission:", perm)
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if 0200&perm != 0 {
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return nil
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}
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return errors.New("Not writable!")
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}
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func GetFileSize(file *os.File) (size int64, err error) {
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var fi os.FileInfo
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if fi, err = file.Stat(); err == nil {
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size = fi.Size()
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}
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return
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}
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func FileExists(filename string) bool {
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_, err := os.Stat(filename)
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if os.IsNotExist(err) {
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return false
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}
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return true
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}
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func FolderExists(folder string) bool {
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fileInfo, err := os.Stat(folder)
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if err != nil {
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return false
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}
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return fileInfo.IsDir()
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}
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func CheckFile(filename string) (exists, canRead, canWrite bool, modTime time.Time, fileSize int64) {
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exists = true
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fi, err := os.Stat(filename)
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if os.IsNotExist(err) {
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exists = false
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return
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}
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if err != nil {
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glog.Errorf("check %s: %v", filename, err)
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return
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}
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if fi.Mode()&0400 != 0 {
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canRead = true
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}
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if fi.Mode()&0200 != 0 {
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canWrite = true
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}
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modTime = fi.ModTime()
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fileSize = fi.Size()
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return
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}
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func ResolvePath(path string) string {
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if !strings.Contains(path, "~") {
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return path
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}
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usr, _ := user.Current()
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dir := usr.HomeDir
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if path == "~" {
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// In case of "~", which won't be caught by the "else if"
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path = dir
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} else if strings.HasPrefix(path, "~/") {
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// Use strings.HasPrefix so we don't match paths like
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// "/something/~/something/"
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path = filepath.Join(dir, path[2:])
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}
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return path
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}
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func FileNameBase(filename string) string {
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lastDotIndex := strings.LastIndex(filename, ".")
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if lastDotIndex < 0 {
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return filename
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}
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return filename[:lastDotIndex]
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}
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func ToShortFileName(path string) string {
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fileName := filepath.Base(path)
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if fileNameBytes := []byte(fileName); len(fileNameBytes) > maxFilenameLength {
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shaStr := fmt.Sprintf("%x", sha256.Sum256(fileNameBytes))
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fileNameBase := FileNameBase(fileName)
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fileExt := fileName[len(fileNameBase):]
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fileNameBaseBates := bytes.ToValidUTF8([]byte(fileNameBase)[:maxFilenameLength-len([]byte(fileExt))-8], []byte{})
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shortFileName := string(fileNameBaseBates) + shaStr[len(shaStr)-8:]
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return filepath.Join(filepath.Dir(path), shortFileName) + fileExt
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}
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return path
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}
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// Copied from os.WriteFile(), adding file sync.
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// see https://github.com/golang/go/issues/20599
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func WriteFile(name string, data []byte, perm os.FileMode) error {
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f, err := os.OpenFile(name, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
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if err != nil {
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return err
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}
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_, err = f.Write(data)
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if err1 := f.Sync(); err1 != nil && err == nil {
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err = err1
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}
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if err1 := f.Close(); err1 != nil && err == nil {
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err = err1
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}
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return err
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}
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