How to Retrieve GOOS and GOARCH Values from a Go Executable?

Determining GOOS and GOARCH Values for an Executable

When given an executable file, ascertaining the values of GOOS (operating system) and GOARCH (processor architecture) used during its compilation becomes necessary. This inquiry focuses on identifying a mechanism for retrieving those values from the executable itself.

Understanding the Runtime Package

The runtime package in Go offers insights into the runtime characteristics of a program. Specifically, it contains constants or functions that provide information about the GOOS, GOARCH, GOPATH, and GOROOT environment variables.

Retrieving GOOS and GOARCH Values

To determine the GOOS and GOARCH values, the runtime package provides the following constants:

• runtime.GOOS: Represents the operating system used during compilation.
• runtime.GOARCH: Indicates the processor architecture targeted by the compilation process.

These constants hold the exact values that were set at compile time.

Example

Consider the following code snippet:

package main

import (
    "fmt"
    "runtime"
)

func main() {
    fmt.Println(runtime.GOOS)
    fmt.Println(runtime.GOARCH)
}

When this program is executed, it will output the values of GOOS and GOARCH specified during compilation. For example, if GOOS is set to "windows" and GOARCH is set to "amd64," the program will print:

windows
amd64

This will remain true even if GOOS and GOARCH are subsequently modified. The values stored in the runtime package constants remain those specified at compilation time.

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