如何正确复制二进制文件

Question

我使用以下代码以编程方式构建二进制文件,二进制文件已成功构建,但现在我想通过代码将其复制到go/bin路径,我能够做到,但它复制文件但不是可执行文件.

什么可能是错的？源文件是可执行的

bPath := filepath.FromSlash("./integration/testdata/" + fileName)
cmd := exec.Command("go", "build", "-o", bPath, ".")
cmd.Dir = filepath.FromSlash("../")
err := cmd.Run()
if err != nil {
    fmt.Println("binary creation failed: ", err)
}

fmt.Println(os.Getenv("GOPATH"))
dir, _ := os.Getwd()
srcPath := filepath.Join(dir, "testdata", , fileName)
targetPath := filepath.Join(os.Getenv("GOPATH"),"/bin/",fileName)
copy(srcPath, targetPath)

副本是:

func copy(src string, dst string) error {
    // Read all content of src to data
    data, err := ioutil.ReadFile(src)
    if err != nil {
        return err
    }
    // Write data to dst
    err = ioutil.WriteFile(dst, data, 0644)
    if err != nil {
        return err
    }

    return nil
}

Answer 1

问题在于您提供的权限位掩码:0644.它不包括可执行权限,这是每个组中的最低位.

所以改为使用0755,结果文件将由每个人执行:

err = ioutil.WriteFile(dst, data, 0755)

查看Wikipedia Chmod的bitmask含义.

相关的位掩码表:

#    Permission               rwx    Binary
-------------------------------------------
7    read, write and execute  rwx    111
6    read and write           rw-    110
5    read and execute         r-x    101
4    read only                r--    100
3    write and execute        -wx    011
2    write only               -w-    010
1    execute only             --x    001
0    none                     ---    000