copy a directory in go

main.go
package main

import (
    "io"
    "os"
)

func copyDir(src, dst string) error {
    // get properties of source dir
    srcInfo, err := os.Stat(src)
    if err != nil {
        return err
    }

    // create destination dir
    err = os.MkdirAll(dst, srcInfo.Mode())
    if err != nil {
        return err
    }

    // get contents of the source dir
    entries, err := os.ReadDir(src)
    if err != nil {
        return err
    }

    // copy each file/dir in the source dir to destination dir
    for _, entry := range entries {
        srcPath := src + "/" + entry.Name()
        dstPath := dst + "/" + entry.Name()

        // recursively copy a directory
        if entry.IsDir() {
            err = copyDir(srcPath, dstPath)
            if err != nil {
                return err
            }
        } else {
            // perform copy operation on a file
            err = copyFile(srcPath, dstPath)
            if err != nil {
                return err
            }
        }
    }
    return nil
}

func copyFile(src, dst string) error {
    sourceFile, err := os.Open(src)
    if err != nil {
        return err
    }
    defer sourceFile.Close()

    destFile, err := os.Create(dst)
    if err != nil {
        return err
    }
    defer destFile.Close()

    _, err = io.Copy(destFile, sourceFile)
    if err == nil {
        sourceInfo, err := os.Stat(src)
        if err != nil {
            err = os.Chmod(dst, sourceInfo.Mode())
        }

    }
    return err
}

func main() {
    // examples
    err := copyDir("./srcDir", "./dstDir")
    if err != nil {
        println("Error: ", err)
    }
}
1622 chars
80 lines