How to Pass Environment Variables to `ansible-playbook` Using `exec.Command` in Go?

Passing Environment Variables with exec.Command

In Go, utilizing the exec.Command function allows you to execute external commands with specific parameters. This becomes particularly useful when requiring the passing of environment variables, as in the case of the example provided.

The question poses a challenge of passing an environment variable to the ansible-playbook command using exec.Command. Traditionally, the Bash equivalent would involve setting the environment variable before executing the command. However, this method is not ideal for parallel executions as it modifies the global environment.

The solution lies in explicitly setting the environment variable within the exec.Command call. The following code snippet demonstrates how to do this while preserving the existing environment variables:

import (
    "os"
    "os/exec"
)

func main() {
    // Initialize the command
    cmd := exec.Command("ansible-playbook", args...)

    // Preserve existing environment variables
    cmd.Env = os.Environ()

    // Append the custom environment variable
    cmd.Env = append(cmd.Env, "MY_VAR=some_value")

    // Execute the command
    if err := cmd.Run(); err != nil {
        // Handle error
    }
}

By using this approach, the MY_VAR environment variable will be set specifically for this command execution, leaving the global environment unaffected.

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