使用golang解压缩文件的简便方法

is there a easy way to unzip file with golang ?

right now my code is:

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()

        path := filepath.Join(dest, f.Name)
        if f.FileInfo().IsDir() {
            os.MkdirAll(path, f.Mode())
        } else {
            f, err := os.OpenFile(
                path, 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
}

Slight rework of the OP's solution to create the containing directory dest if it doesn't exist, and to wrap the file extraction/writing in a closure to eliminate stacking of defer .Close() calls per @Nick Craig-Wood's comment:

func Unzip(src, dest string) error {
    r, err := zip.OpenReader(src)
    if err != nil {
        return err
    }
    defer func() {
        if err := r.Close(); err != nil {
            panic(err)
        }
    }()

    os.MkdirAll(dest, 0755)

    // Closure to address file descriptors issue with all the deferred .Close() methods
    extractAndWriteFile := func(f *zip.File) error {
        rc, err := f.Open()
        if err != nil {
            return err
        }
        defer func() {
            if err := rc.Close(); err != nil {
                panic(err)
            }
        }()

        path := filepath.Join(dest, f.Name)

        if f.FileInfo().IsDir() {
            os.MkdirAll(path, f.Mode())
        } else {
            os.MkdirAll(filepath.Dir(path), f.Mode())
            f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
            if err != nil {
                return err
            }
            defer func() {
                if err := f.Close(); err != nil {
                    panic(err)
                }
            }()

            _, err = io.Copy(f, rc)
            if err != nil {
                return err
            }
        }
        return nil
    }

    for _, f := range r.File {
        err := extractAndWriteFile(f)
        if err != nil {
            return err
        }
    }

    return nil
}

Note: Updated to include Close() error handling as well (if we're looking for best practices, may as well follow ALL of them).

I have been doing some browsing of google and repeatedly found people saying that there is no library that can handle that. Maybe I missed a custom repository in my search though and someone else will find it for us.

You may be able to make use of io.Copy(src, dest) to ease the process but I haven't tested it at all.

For instance:

os.MkDirAll(dest, r.File.Mode)
d, _ := os.Open(dest)
io.Copy(r.File, d)

Honestly to me your code looks pretty nice and if I were to do an Extract function myself (and the above doesn't work) then I would probably take a page from your book.

I would prefer using 7zip with Go, which would give you something like this.

func extractZip() {
    fmt.Println("extracting", zip_path)
    commandString := fmt.Sprintf(`7za e %s %s`, zip_path, dest_path)
    commandSlice := strings.Fields(commandString)
    fmt.Println(commandString)
    c := exec.Command(commandSlice[0], commandSlice[1:]...)
    e := c.Run()
    checkError(e)
}

Better example code

However, if using 7zip isn't possible, then try this. Defer a recover to catch the panics. (Example)

func checkError(e error){
  if e != nil {
    panic(e)
  }
}
func cloneZipItem(f *zip.File, dest string){
    // Create full directory path
    path := filepath.Join(dest, f.Name)
    fmt.Println("Creating", path)
    err := os.MkdirAll(filepath.Dir(path), os.ModeDir|os.ModePerm)
    checkError(err)

    // Clone if item is a file
    rc, err := f.Open()
    checkError(err)
    if !f.FileInfo().IsDir() {
        // Use os.Create() since Zip don't store file permissions.
        fileCopy, err := os.Create(path)
        checkError(err)
        _, err = io.Copy(fileCopy, rc)
        fileCopy.Close()
        checkError(err)
    }
    rc.Close()
}
func Extract(zip_path, dest string) {
    r, err := zip.OpenReader(zip_path)
    checkError(err)
    defer r.Close()
    for _, f := range r.File {
        cloneZipItem(f, dest)
    }
}

I'm using archive/zip package to read .zip files and copy to the local disk. Below is the source code to unzip .zip files for my own needs.

import (
    "archive/zip"
    "io"
    "log"
    "os"
    "path/filepath"
    "strings"
)

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
}