You can set environment variables in an exec.Cmd:
https://golang.org/pkg/os/exec/#Cmd
% cat example.sh
#!/usr/bin/env bash
echo "The password is $password."
% export password=old_password
% bash example.sh
The password is old_password.
% cat example.go
package main
import (
"fmt"
"os"
"os/exec"
)
func main() {
c := exec.Command("bash", "example.sh")
c.Env = []string{"password=monkey"}
c.Stdout = os.Stdout
c.Stderr = os.Stderr
if err := c.Run(); err != nil {
fmt.Printf("Command failed: %s\n", err)
}
}
% go run example.go
The password is monkey.
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