I was trying to unzip a .docx file. First file of name "[Content_Types].xml" has been extracted. But then I encountered an error as follows:
open frontend/uploads/doc_data/_rels/.rels: permission denied
How can we set permission for this?
The unzip function I use is as follows:
func Unzip(src, dest string) error {
r, err := zip.OpenReader(src)
if err != nil {
return err
}
defer r.Close()
for _, f := range r.File {
rc, err := f.Open()
if err != nil {
return err
}
defer rc.Close()
fpath := filepath.Join(dest, f.Name)
if f.FileInfo().IsDir() {
os.MkdirAll(fpath, f.Mode())
} else {
var fdir string
if lastIndex := strings.LastIndex(fpath,string(os.PathSeparator)); lastIndex > -1 {
fdir = fpath[:lastIndex]
}
err = os.MkdirAll(fdir, f.Mode())
if err != nil {
log.Fatal(err)
return err
}
f, err := os.OpenFile(
fpath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
if err != nil {
return err
}
defer f.Close()
_, err = io.Copy(f, rc)
if err != nil {
return err
}
}
}
return nil
}
Try using the Chmod function of the os package to set the file permissions to something that allows you to do what you want.
err := os.Chmod("file.txt", 0777)
if err != nil {
fmt.Println(err)
}
more info here : https://socketloop.com/tutorials/golang-change-file-read-or-write-permission-example
Related
I am trying to zip a folder containing files using following code
func zipFolder(source string) error {
target := "uniq.zip"
zipfile, err := os.Create(target)
if err != nil {
return err
}
defer zipfile.Close()
archive := zip.NewWriter(zipfile)
defer archive.Close()
info, err := os.Stat(source)
if err != nil {
return nil
}
var baseDir string
if info.IsDir() {
baseDir = filepath.Base(source)
}
filepath.Walk(source, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
header, err := zip.FileInfoHeader(info)
if err != nil {
return err
}
if baseDir != "" {
header.Name = filepath.Join(baseDir, strings.TrimPrefix(path, source))
}
if info.IsDir() {
header.Name += "/"
} else {
header.Method = zip.Store
}
writer, err := archive.CreateHeader(header)
if err != nil {
return err
}
if info.IsDir() {
return nil
}
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
_, err = io.Copy(writer, file)
return err
})
return err
}
This successfully generates a zip while but when i unzip it (I am using mac), the compressed file is of 0 bytes without any content.
Any idea what am i doing wrong here?
I'm trying to list directory contents on a share from Linux to Windows using Go.
So far I've managed to Create/Remove new files inside a share with full Read/Write permissions.
Go module: https://godoc.org/github.com/hirochachacha/go-smb2#Client
Functions:
func connect_client(host string, share string, session map[string]string) *smb2.Client {
//Checks for a connection on port
conn, err := net.Dial("tcp", host+":445")
if err != nil {
panic(err)
}
//smb auth
d := &smb2.Dialer{
Initiator: &smb2.NTLMInitiator{
User: session["Username"],
Password: session["Password"],
Domain: session["Domain"],
},
}
//Returns a client session
client, err := d.Dial(conn)
if err != nil {
fmt.Println("Connection failed")
client.Logoff()
} else {
fmt.Println("Connection Succeeded")
}
return client
}
func check_write(host string, client *smb2.Client) {
file := "asdasdas.txt"
fs, err := client.Mount(host)
if err != nil {
fmt.Println(err)
os.Exit(0)
}
defer fs.Umount()
share := strings.Split(host, `\\`)
f, err := fs.Create(file)
if err != nil {
fmt.Println("You do not have write permissions on directory:%s ! \n", strings.Split(share[1], `\`)[1])
os.Exit(0)
}
defer fs.Remove(file)
defer f.Close()
fmt.Printf("You have write permissions to directory: %s \n", strings.Split(share[1], `\`)[1]))
}
func list_all(client *smb2.Client, host string) {
fs, err := client.Mount(host)
if err != nil {
fmt.Println(err)
os.Exit(0)
}
defer fs.Umount()
_, err = fs.Open(`Test.txt`)
if err != nil {
fmt.Println(err)
os.Exit(0)
}
}
func main() {
host, share, action, session := get_flags()
client := connect_client(host, share, session)
full_host := `\\` + host + `\` + share
//File create
if action == "check_write" {
check_write(full_host, client)
}
if action == "list_files" {
list_all(client, full_host)
}
}
In the function list_all() everything works, but when I am trying to access \\192.168.1.19\Sharing only..
When I input just a host with directory name it seas it can not list the directory path because it can not find the object specified.
I can't understand how I can get pointer used for *RemoteFile in order to use the functions:
f.Readdir()
f.Name()
etc....
So far I managed to use *RemoteFileSystem only for all other actions but I want to list all contents of the directory..
Help would be much appreciated!
Edit:
If it wasn't clear enough, in order to use functions like:
f.Readdir()
f.Name()
I need to get a pointer for *RemoteFile, this is my main issue
https://godoc.org/github.com/hirochachacha/go-smb2#RemoteFileSystem.Open
Use Open on a RemoteFileSystem and either a directory name, or empty string for the directory at the root of the filesystem.
e.g.
client, err := d.Dial(conn)
if err != nil {
return err
}
rfs, err := client.Mount("jrwren")
if err != nil {
return err
}
// cat the NOTES file.
f, err := rfs.Open("NOTES")
if err != nil {
return err
}
defer f.Close()
io.Copy(os.Stdout, f)
// List all the files
dir, err := rfs.Open("")
if err != nil {
return err
}
fis, err := dir.Readdir(10)
if err != nil {
return err
}
for i := range fis {
fmt.Println(fis[i].Name())
}
func list_all(client *smb2.Client, host string) {
fs, err := client.Mount(host)
if err != nil {
fmt.Println(err)
os.Exit(0)
}
dir, err := fs.Open("")
if err != nil {
fmt.Println(err)
os.Exit(0)
}
fis, err := dir.Readdir(-1)
if err != nil {
fmt.Println(err)
os.Exit(0)
}
for i := range fis {
fmt.Println(fis[i].Name())
}
}
This would be the answer thank you!
Is there an easy way to copy a directory in go?
I have the following function:
err = CopyDir("sourceFolder","destinationFolder")
Nothing so far has worked, including libraries such as github.com/cf-guardian/guardian/kernel/fileutils
One important thing to note is that I need to preserve directory structure, including the sourceFolder itself, not simply copy all contents of the folder.
I believe that docker implementation can be considered as complete solution for handling edge cases:
https://github.com/moby/moby/blob/master/daemon/graphdriver/copy/copy.go
There are following good things:
unsupported file type rise error
preserving permissions and ownership
preserving extended attributes
preserving timestamp
but because of a lot of imports your tiny application becomes huge.
I've tried to combine several solutions but use stdlib and for Linux only:
func CopyDirectory(scrDir, dest string) error {
entries, err := os.ReadDir(scrDir)
if err != nil {
return err
}
for _, entry := range entries {
sourcePath := filepath.Join(scrDir, entry.Name())
destPath := filepath.Join(dest, entry.Name())
fileInfo, err := os.Stat(sourcePath)
if err != nil {
return err
}
stat, ok := fileInfo.Sys().(*syscall.Stat_t)
if !ok {
return fmt.Errorf("failed to get raw syscall.Stat_t data for '%s'", sourcePath)
}
switch fileInfo.Mode() & os.ModeType{
case os.ModeDir:
if err := CreateIfNotExists(destPath, 0755); err != nil {
return err
}
if err := CopyDirectory(sourcePath, destPath); err != nil {
return err
}
case os.ModeSymlink:
if err := CopySymLink(sourcePath, destPath); err != nil {
return err
}
default:
if err := Copy(sourcePath, destPath); err != nil {
return err
}
}
if err := os.Lchown(destPath, int(stat.Uid), int(stat.Gid)); err != nil {
return err
}
fInfo, err := entry.Info()
if err != nil {
return err
}
isSymlink := fInfo.Mode()&os.ModeSymlink != 0
if !isSymlink {
if err := os.Chmod(destPath, fInfo.Mode()); err != nil {
return err
}
}
}
return nil
}
func Copy(srcFile, dstFile string) error {
out, err := os.Create(dstFile)
if err != nil {
return err
}
defer out.Close()
in, err := os.Open(srcFile)
defer in.Close()
if err != nil {
return err
}
_, err = io.Copy(out, in)
if err != nil {
return err
}
return nil
}
func Exists(filePath string) bool {
if _, err := os.Stat(filePath); os.IsNotExist(err) {
return false
}
return true
}
func CreateIfNotExists(dir string, perm os.FileMode) error {
if Exists(dir) {
return nil
}
if err := os.MkdirAll(dir, perm); err != nil {
return fmt.Errorf("failed to create directory: '%s', error: '%s'", dir, err.Error())
}
return nil
}
func CopySymLink(source, dest string) error {
link, err := os.Readlink(source)
if err != nil {
return err
}
return os.Symlink(link, dest)
}
This package seems to do exactly what you want to do, give it a try.
From the readme:
err := Copy("your/source/directory", "your/destination/directory")
Not satisfied with the already listed options which include using sketchy libraries, or vastly bloated libraries.
In my case, I opted to do things the old fashioned way. With shell commands!
import (
"os/exec"
)
func main() {
// completely arbitrary paths
oldDir := "/home/arshbot/"
newDir := "/tmp/"
cmd := exec.Command("cp", "--recursive", oldDir, newDir)
cmd.Run()
}
This solution copies a directory recursively, including symbolic links. Trying to be efficient in the actual copy stage using streams.
Also it's fairly easy to handle more of irregular files if needed.
// CopyDir copies the content of src to dst. src should be a full path.
func CopyDir(dst, src string) error {
return filepath.Walk(src, func(path string, info fs.FileInfo, err error) error {
if err != nil {
return err
}
// copy to this path
outpath := filepath.Join(dst, strings.TrimPrefix(path, src))
if info.IsDir() {
os.MkdirAll(outpath, info.Mode())
return nil // means recursive
}
// handle irregular files
if !info.Mode().IsRegular() {
switch info.Mode().Type() & os.ModeType {
case os.ModeSymlink:
link, err := os.Readlink(path)
if err != nil {
return err
}
return os.Symlink(link, outpath)
}
return nil
}
// copy contents of regular file efficiently
// open input
in, _ := os.Open(path)
if err != nil {
return err
}
defer in.Close()
// create output
fh, err := os.Create(outpath)
if err != nil {
return err
}
defer fh.Close()
// make it the same
fh.Chmod(info.Mode())
// copy content
_, err = io.Copy(fh, in)
return err
})
}
I've come up with a relatively shorter answer which uses path/filepath's Walk method:
import (
"io/ioutil"
"path/filepath"
"os"
"strings"
)
func copy(source, destination string) error {
var err error = filepath.Walk(source, func(path string, info os.FileInfo, err error) error {
var relPath string = strings.Replace(path, source, "", 1)
if relPath == "" {
return nil
}
if info.IsDir() {
return os.Mkdir(filepath.Join(destination, relPath), 0755)
} else {
var data, err1 = ioutil.ReadFile(filepath.Join(source, relPath))
if err1 != nil {
return err1
}
return ioutil.WriteFile(filepath.Join(destination, relPath), data, 0777)
}
})
return err
}
Also this might be a solution:
available on github.com/floscodes/golang-tools
import (
"fmt"
"io/ioutil"
"os"
)
func CopyDir(src string, dest string) error {
if dest[:len(src)] == src {
return fmt.Errorf("Cannot copy a folder into the folder itself!")
}
f, err := os.Open(src)
if err != nil {
return err
}
file, err := f.Stat()
if err != nil {
return err
}
if !file.IsDir() {
return fmt.Errorf("Source " + file.Name() + " is not a directory!")
}
err = os.Mkdir(dest, 0755)
if err != nil {
return err
}
files, err := ioutil.ReadDir(src)
if err != nil {
return err
}
for _, f := range files {
if f.IsDir() {
err = CopyDir(src+"/"+f.Name(), dest+"/"+f.Name())
if err != nil {
return err
}
}
if !f.IsDir() {
content, err := ioutil.ReadFile(src + "/" + f.Name())
if err != nil {
return err
}
err = ioutil.WriteFile(dest+"/"+f.Name(), content, 0755)
if err != nil {
return err
}
}
}
return nil
}
I'm trying to move a file from my C-drive to my H-drive using os.Replace().
The code looks as follows:
func MoveFile(source string, destination string) {
err := os.Rename(source, destination)
if err != nil {
fmt.Println(err)
}
}
However, when I run the code I get the following error:
rename C:\old\path\to\file.txt H:\new\path\to\file.txt: The system cannot move the file to a different disk drive.
I found this issue on GitHub that specifies the problem but it appears that they will not change this function to allow it to move file on different disk drives.
I already searched for other possibilities to move files, but found nothing in the standard documentation or the internet.
So, what should I do now to be able to move files on different disk drives?
As the comment said, you'll need to create a new file on the other disk, copy the contents, and then remove the original. It's straightforward using os.Create, io.Copy, and os.Remove:
import (
"fmt"
"io"
"os"
)
func MoveFile(sourcePath, destPath string) error {
inputFile, err := os.Open(sourcePath)
if err != nil {
return fmt.Errorf("Couldn't open source file: %s", err)
}
outputFile, err := os.Create(destPath)
if err != nil {
inputFile.Close()
return fmt.Errorf("Couldn't open dest file: %s", err)
}
defer outputFile.Close()
_, err = io.Copy(outputFile, inputFile)
inputFile.Close()
if err != nil {
return fmt.Errorf("Writing to output file failed: %s", err)
}
// The copy was successful, so now delete the original file
err = os.Remove(sourcePath)
if err != nil {
return fmt.Errorf("Failed removing original file: %s", err)
}
return nil
}
You need to make sure that you handle all cases on both Linux and Windows. For example, for any size file,
package main
import (
"flag"
"fmt"
"io"
"os"
)
func MoveFile(source, destination string) (err error) {
src, err := os.Open(source)
if err != nil {
return err
}
defer src.Close()
fi, err := src.Stat()
if err != nil {
return err
}
flag := os.O_WRONLY | os.O_CREATE | os.O_TRUNC
perm := fi.Mode() & os.ModePerm
dst, err := os.OpenFile(destination, flag, perm)
if err != nil {
return err
}
defer dst.Close()
_, err = io.Copy(dst, src)
if err != nil {
dst.Close()
os.Remove(destination)
return err
}
err = dst.Close()
if err != nil {
return err
}
err = src.Close()
if err != nil {
return err
}
err = os.Remove(source)
if err != nil {
return err
}
return nil
}
func main() {
var src, dst string
flag.StringVar(&src, "src", "", "source file")
flag.StringVar(&dst, "dst", "", "destination file")
flag.Parse()
if src == "" || dst == "" {
flag.Usage()
os.Exit(1)
}
err := MoveFile(src, dst)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
fmt.Printf("moved %q to %q\n", src, dst)
}
Output (Linux):
$ cp move.file src.file && go build movefile.go && ./movefile -src=src.file -dst=dst.file
moved "src.file" to "dst.file"
$
Output (Windows):
>copy /Y move.file src.file && go build movefile.go && movefile -src=src.file -dst=dst.file
moved "src.file" to "dst.file"
>
This solution Moves the file and preserves permissions:
func MoveFile(src, dst string) error {
in, err := os.Open(src)
if err != nil {
return fmt.Errorf("Couldn't open source file: %s", err)
}
out, err := os.Create(dst)
if err != nil {
in.Close()
return fmt.Errorf("Couldn't open dest file: %s", err)
}
defer out.Close()
_, err = io.Copy(out, in)
in.Close()
if err != nil {
return fmt.Errorf("Writing to output file failed: %s", err)
}
err = out.Sync()
if err != nil {
return fmt.Errorf("Sync error: %s", err)
}
si, err := os.Stat(src)
if err != nil {
return fmt.Errorf("Stat error: %s", err)
}
err = os.Chmod(dst, si.Mode())
if err != nil {
return fmt.Errorf("Chmod error: %s", err)
}
err = os.Remove(src)
if err != nil {
return fmt.Errorf("Failed removing original file: %s", err)
}
return nil
}
If only want to Copy the file without remove the original:
func CopyFile(src, dst string) error {
in, err := os.Open(src)
if err != nil {
return fmt.Errorf("Couldn't open source file: %s", err)
}
out, err := os.Create(dst)
if err != nil {
in.Close()
return fmt.Errorf("Couldn't open dest file: %s", err)
}
defer out.Close()
_, err = io.Copy(out, in)
in.Close()
if err != nil {
return fmt.Errorf("Writing to output file failed: %s", err)
}
err = out.Sync()
if err != nil {
return fmt.Errorf("Sync error: %s", err)
}
si, err := os.Stat(src)
if err != nil {
return fmt.Errorf("Stat error: %s", err)
}
err = os.Chmod(dst, si.Mode())
if err != nil {
return fmt.Errorf("Chmod error: %s", err)
}
return nil
}
Maybe you can use a magic approach, just using the syscall.MoveFile as follows.
func main() {
oldpath := "D:\\black.txt"
newpath := "E:\\black-new.txt"
from, _ := syscall.UTF16PtrFromString(oldpath)
to, _ := syscall.UTF16PtrFromString(newpath)
fmt.Println(*from, *to)
err := syscall.MoveFile(from, to)
if err != nil {
panic(err)
}
}
the program works.
if you want a cross-platform compatibility program, you can implement your own MoveFile.
func MoveFile(src string, dst string) error {
if runtime.GOOS == "windows" {
from, _ := syscall.UTF16PtrFromString(src)
to, _ := syscall.UTF16PtrFromString(dst)
return syscall.MoveFile(from, to)
} else {
return os.Rename(src, dst)
}
}
I would like to decompress tar-gz file by golang.
err := DecompressTarGz('xxx.tar.gz', '/Users/foobarbuzz/')
Use compress/gzip in combination with archive/tar or use os/exec to call tar and gzip directly if you don't like to implement all of that in Go.
I was looking for an answer to this one too. Implemented something that should work.
func Decompress(targetdir string, reader io.ReadCloser) error {
gzReader, err := gzip.NewReader(reader)
if err != nil {
return err
}
defer gzReader.Close()
tarReader := tar.NewReader(gzReader)
for {
header, err := tarReader.Next()
if err == io.EOF {
break
} else if err != nil {
return err
}
target := path.Join(targetdir, header.Name)
switch header.Typeflag {
case tar.TypeDir:
err = os.MkdirAll(target, os.FileMode(header.Mode))
if err != nil {
return err
}
setAttrs(target, header)
break
case tar.TypeReg:
w, err := os.Create(target)
if err != nil {
return err
}
_, err = io.Copy(w, tarReader)
if err != nil {
return err
}
w.Close()
setAttrs(target, header)
break
default:
log.Printf("unsupported type: %v", header.Typeflag)
break
}
}
return nil
}
func setAttrs(target string, header *tar.Header) {
os.Chmod(target, os.FileMode(header.Mode))
os.Chtimes(target, header.AccessTime, header.ModTime)
}