How to Properly Instantiate `os.FileMode` for File Creation and Modification?

Instantiation of os.FileMode for File Creation and Modification

Conventional examples often bypass proper instantiation of os.FileMode by directly setting file permission bits. This approach overlooks the significance of specifying file modes accurately.

To instantiate os.FileMode effectively, consider the following approach:

const (
    // Constants representing file access permissions
    OS_READ = 04
    OS_WRITE = 02
    OS_EX = 01
)

// File modes for different user classes
const (
    OS_USER_R = OS_READ << OS_USER_SHIFT
    OS_USER_W = OS_WRITE << OS_USER_SHIFT
    OS_USER_X = OS_EX << OS_USER_SHIFT
    OS_USER_RW = OS_USER_R | OS_USER_W
    OS_USER_RWX = OS_USER_RW | OS_USER_X
)

With these constants, you can specify file permissions directly:

// Create directory with user read/write/execute and global read permissions
os.FileMode dir_file_mode = os.ModeDir | (OS_USER_RWX | OS_ALL_R)
os.MkdirAll(dir_str, dir_file_mode)

This approach allows for precise control over file permissions, ensuring compliance with security requirements and access control policies.

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