How to Set File Permissions Using os.FileMode in Golang?

Using os.FileMode to Set File Permissions

Creating files in Golang often involves specifying file permissions using bitwise flags. However, many examples simply use numeric permissions, such as 0664, which can be inconvenient.

Properly Instantiating os.FileMode

To properly instantiate os.FileMode, you need to define the following:

• Permission bits: These determine who can read, write, or execute the file.
• User ID (UID): The user who owns the file.
• Group ID (GID): The group that owns the file.

Example Implementation

Since there are no constants for permission bits in os or syscall, you can define your own:

const (
    OS_READ = 04
    OS_WRITE = 02
    OS_EX = 01
    OS_USER_SHIFT = 6
    OS_GROUP_SHIFT = 3
    OS_OTH_SHIFT = 0

    OS_USER_R = OS_READ <p>This allows you to specify permissions directly:</p><pre class="brush:php;toolbar:false">dir_file_mode = os.ModeDir | (OS_USER_RWX | OS_ALL_R)
os.MkdirAll(dir_str, dir_file_mode)

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