set configScanDir as package scoped var (#264)

set config.Install.env variables in environment

adding env to config to use across all stages

switch to config.Scan to read config

internal/agent/install.go

@@ -7,7 +7,6 @@ import (
 	"io/ioutil"
 	"os"
 	"os/exec"
-	"strings"
 	"syscall"
 	"time"
 
@@ -227,14 +226,8 @@ func RunInstall(options map[string]string) error {
 		c.Install.Reboot = true
 	}
 
-	for _, e := range c.Install.Env {
-		pair := strings.SplitN(e, "=", 2)
-		if len(pair) >= 2 {
-			os.Setenv(pair[0], pair[1])
-		}
-	}
-
-	envs := os.Environ()
+	env := append(c.Install.Env, c.Env...)
+	utils.SetEnv(env)
 
 	err := ioutil.WriteFile(f.Name(), []byte(cloudInit), os.ModePerm)
 	if err != nil {
@@ -246,7 +239,7 @@ func RunInstall(options map[string]string) error {
 	args = append(args, "-c", f.Name(), device)
 
 	cmd := exec.Command("elemental", args...)
-	cmd.Env = envs
+	cmd.Env = os.Environ()
 	cmd.Stdout = os.Stdout
 	cmd.Stdin = os.Stdin
 	cmd.Stderr = os.Stderr