refactor: use one provider for default cache url

cache/cache.go

@@ -18,7 +18,7 @@ import (
 	"code.dumpstack.io/tools/out-of-tree/config"
 )
 
-var URL string
+var URL = "https://out-of-tree.fra1.digitaloceanspaces.com/1.0.0/"
 
 func unpackTar(archive, destination string) (err error) {
 	// NOTE: If you're change anything in tar command please check also

cache/cache_test.go

@@ -17,7 +17,6 @@ func TestDownloadQemuImage(t *testing.T) {
 	}
 	defer os.RemoveAll(tmp)
 
-	URL = "https://out-of-tree.fra1.digitaloceanspaces.com/1.0.0/"
 	file := "out_of_tree_ubuntu_12__04.img"
 
 	err = DownloadQemuImage(tmp, file)

distro/debian/debian_test.go

@@ -3,12 +3,10 @@ package debian
 import (
 	"testing"
 
-	"code.dumpstack.io/tools/out-of-tree/cache"
 	"code.dumpstack.io/tools/out-of-tree/config"
 )
 
 func TestMatchImagePkg(t *testing.T) {
-	cache.URL = "https://out-of-tree.fra1.digitaloceanspaces.com/1.0.0/"
 	t.Log("tested with cache by default")
 
 	km := config.KernelMask{

main.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"io"
 	"math/rand"
+	"net/url"
 	"os"
 	"os/exec"
 	"os/user"
@@ -33,7 +34,7 @@ type Globals struct {
 
 	WorkDir string `help:"path to work directory" default:"./" type:"path"`
 
-	CacheURL string `default:"https://out-of-tree.fra1.digitaloceanspaces.com/1.0.0/" hidden:""`
+	CacheURL url.URL
 }
 
 type CLI struct {
@@ -190,7 +191,10 @@ func main() {
 	}
 	container.Runtime = cli.ContainerRuntime
 
-	cache.URL = cli.Globals.CacheURL
+	if cli.Globals.CacheURL.String() != "" {
+		cache.URL = cli.Globals.CacheURL.String()
+	}
+	log.Debug().Msgf("set cache url to %s", cache.URL)
 
 	err = ctx.Run(&cli.Globals)
 	ctx.FatalIfErrorf(err)