Dependency-free .env resolver in Go. Variables are exposed as environmental variables

main.go

// cmd/main.go
package main

import (
	"bufio"
	"errors"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"syscall"
)

func init() {
	if err := setdotenvs(); err != nil {
		panic(err)
	}
}

func setdotenvs() error {
	_, filename, _, ok := runtime.Caller(1)
	if !ok {
		return errors.New("can't get current filename")
	}
	dirname := filepath.Dir(filename)

	file, err := os.Open(dirname + "/../" + ".env")
	if err != nil {
		return err
	}
	defer file.Close()

	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		kv := strings.Split(scanner.Text(), "=")
		if len(kv) != 2 {
			continue
		}
		key, value := kv[0], kv[1]
		if err := os.Setenv(key, value); err != nil {
			return err
		}
	}
	return nil
}