diff --git a/pkg/compiler/spec.go b/pkg/compiler/spec.go
index 3a55e753..a88e8856 100644
--- a/pkg/compiler/spec.go
+++ b/pkg/compiler/spec.go
@@ -91,7 +91,7 @@ type LuetCompilationSpec struct {
 	Prelude         []string                  `json:"prelude"` // Are run inside the image which will be our builder
 	Image           string                    `json:"image"`
 	Seed            string                    `json:"seed"`
-	Package         *pkg.DefaultPackage       `json:"-"`
+	Package         *pkg.DefaultPackage       `json:"package"`
 	SourceAssertion solver.PackagesAssertions `json:"-"`
 
 	OutputPath string   `json:"-"` // Where the build processfiles go
diff --git a/pkg/installer/client/local.go b/pkg/installer/client/local.go
index ac4dc561..3d0ce012 100644
--- a/pkg/installer/client/local.go
+++ b/pkg/installer/client/local.go
@@ -18,8 +18,11 @@ package client
 import (
 	"io/ioutil"
 	"os"
+	"path"
 	"path/filepath"
 
+	. "github.com/mudler/luet/pkg/logger"
+
 	"github.com/mudler/luet/pkg/compiler"
 	"github.com/mudler/luet/pkg/helpers"
 )
@@ -33,18 +36,20 @@ func NewLocalClient(r RepoData) *LocalClient {
 }
 
 func (c *LocalClient) DownloadArtifact(artifact compiler.Artifact) (compiler.Artifact, error) {
-
+	artifactName := path.Base(artifact.GetPath())
+	Info("Downloading artifact", artifactName, "from", c.RepoData.Uri)
 	file, err := ioutil.TempFile(os.TempDir(), "localclient")
 	if err != nil {
 		return nil, err
 	}
 	//defer os.Remove(file.Name())
 
-	err = helpers.CopyFile(filepath.Join(c.RepoData.Uri, artifact.GetPath()), file.Name())
+	err = helpers.CopyFile(filepath.Join(c.RepoData.Uri, artifactName), file.Name())
 
 	return compiler.NewPackageArtifact(file.Name()), nil
 }
 func (c *LocalClient) DownloadFile(name string) (string, error) {
+	Info("Downloading file", name, "from", c.RepoData.Uri)
 
 	file, err := ioutil.TempFile(os.TempDir(), "localclient")
 	if err != nil {
diff --git a/pkg/installer/installer.go b/pkg/installer/installer.go
index 87403a11..8fdfaa69 100644
--- a/pkg/installer/installer.go
+++ b/pkg/installer/installer.go
@@ -98,7 +98,7 @@ func (l *LuetInstaller) Install(p []pkg.Package, s *System) error {
 	for _, r := range l.PackageRepositories {
 		repo, err := r.Sync()
 		if err != nil {
-			return errors.Wrap(err, "Failed syncing repository"+r.GetName())
+			return errors.Wrap(err, "Failed syncing repository: "+r.GetName())
 		}
 		syncedRepos = append(syncedRepos, repo)
 	}
@@ -171,6 +171,10 @@ func (l *LuetInstaller) Install(p []pkg.Package, s *System) error {
 			}
 		A:
 			for _, artefact := range matches[0].Repo.GetIndex() {
+				if artefact.GetCompileSpec().GetPackage() == nil {
+					return errors.New("Package in compilespec empty")
+
+				}
 				if matches[0].Package.Matches(artefact.GetCompileSpec().GetPackage()) {
 					// TODO: Filter out already installed?
 					toInstall[assertion.Package.GetFingerPrint()] = ArtifactMatch{Package: assertion.Package, Artifact: artefact, Repository: matches[0].Repo}
diff --git a/pkg/installer/installer_test.go b/pkg/installer/installer_test.go
index 2f566050..a03a0e67 100644
--- a/pkg/installer/installer_test.go
+++ b/pkg/installer/installer_test.go
@@ -104,8 +104,8 @@ var _ = Describe("Installer", func() {
 			repo2, err := NewLuetRepositoryFromYaml([]byte(`
 name: "test"
 type: "local"
-uri: "` + tmpdir + `"
-`))
+uri: "`+tmpdir+`"
+`), pkg.NewInMemoryDatabase(false))
 			Expect(err).ToNot(HaveOccurred())
 
 			inst.Repositories(Repositories{repo2})
diff --git a/pkg/installer/interface.go b/pkg/installer/interface.go
index 3696a1bf..5531143b 100644
--- a/pkg/installer/interface.go
+++ b/pkg/installer/interface.go
@@ -41,6 +41,7 @@ type Repository interface {
 	GetPriority() int
 	GetIndex() compiler.ArtifactIndex
 	GetTree() tree.Builder
+	SetTree(tree.Builder)
 	Write(path string) error
 	Sync() (Repository, error)
 	GetTreePath() string
diff --git a/pkg/installer/repository.go b/pkg/installer/repository.go
index f79f1467..790592da 100644
--- a/pkg/installer/repository.go
+++ b/pkg/installer/repository.go
@@ -43,6 +43,14 @@ type LuetRepository struct {
 	Type     string                 `json:"type"`
 }
 
+type LuetRepositorySerialized struct {
+	Name     string                      `json:"name"`
+	Uri      string                      `json:"uri"`
+	Priority int                         `json:"priority"`
+	Index    []*compiler.PackageArtifact `json:"index"`
+	Type     string                      `json:"type"`
+}
+
 func GenerateRepository(name, uri, t string, priority int, src, treeDir string, db pkg.PackageDatabase) (Repository, error) {
 
 	art, err := buildPackageIndex(src)
@@ -62,13 +70,25 @@ func NewLuetRepository(name, uri, t string, priority int, art []compiler.Artifac
 	return &LuetRepository{Index: art, Type: t, Tree: builder, Name: name, Uri: uri, Priority: priority}
 }
 
-func NewLuetRepositoryFromYaml(data []byte) (Repository, error) {
-	var p LuetRepository
+func NewLuetRepositoryFromYaml(data []byte, db pkg.PackageDatabase) (Repository, error) {
+	var p *LuetRepositorySerialized
+	r := &LuetRepository{}
 	err := yaml.Unmarshal(data, &p)
 	if err != nil {
-		return &p, err
+		return nil, err
 	}
-	return &p, err
+	r.Name = p.Name
+	r.Uri = p.Uri
+	r.Priority = p.Priority
+	r.Type = p.Type
+	i := compiler.ArtifactIndex{}
+	for _, ii := range p.Index {
+		i = append(i, ii)
+	}
+	r.Index = i
+	r.Tree = tree.NewInstallerRecipe(db)
+
+	return r, err
 }
 
 func buildPackageIndex(path string) ([]compiler.Artifact, error) {
@@ -114,6 +134,10 @@ func (r *LuetRepository) SetTreePath(p string) {
 	r.TreePath = p
 }
 
+func (r *LuetRepository) SetTree(b tree.Builder) {
+	r.Tree = b
+}
+
 func (r *LuetRepository) GetType() string {
 	return r.Type
 }
@@ -141,6 +165,7 @@ func (r *LuetRepository) Write(dst string) error {
 	if err != nil {
 		return err
 	}
+	r.Index = r.Index.CleanPath()
 	err = ioutil.WriteFile(filepath.Join(dst, "repository.yaml"), data, os.ModePerm)
 	if err != nil {
 		return err
@@ -171,7 +196,9 @@ func (r *LuetRepository) Client() Client {
 }
 func (r *LuetRepository) Sync() (Repository, error) {
 	c := r.Client()
-
+	if c == nil {
+		return nil, errors.New("No client could be generated from repository.")
+	}
 	file, err := c.DownloadFile("repository.yaml")
 	if err != nil {
 		return nil, errors.Wrap(err, "While downloading repository.yaml from "+r.GetUri())
@@ -182,7 +209,8 @@ func (r *LuetRepository) Sync() (Repository, error) {
 	}
 	defer os.Remove(file)
 
-	repo, err := NewLuetRepositoryFromYaml(dat)
+	// TODO: make it swappable
+	repo, err := NewLuetRepositoryFromYaml(dat, pkg.NewInMemoryDatabase(false))
 	if err != nil {
 		return nil, errors.Wrap(err, "Error reading repository from file "+file)
 
@@ -212,11 +240,12 @@ func (r *LuetRepository) Sync() (Repository, error) {
 		return nil, errors.Wrap(err, "Error met while unpacking rootfs")
 	}
 
-	reciper := tree.NewInstallerRecipe(r.GetTree().Tree().GetPackageSet())
+	reciper := tree.NewInstallerRecipe(pkg.NewInMemoryDatabase(false))
 	err = reciper.Load(treefs)
 	if err != nil {
 		return nil, errors.Wrap(err, "Error met while unpacking rootfs")
 	}
+	repo.SetTree(reciper)
 	repo.SetTreePath(treefs)
 
 	return repo, nil
diff --git a/pkg/tree/installer_recipe.go b/pkg/tree/installer_recipe.go
index c642bc5d..8dbf27ba 100644
--- a/pkg/tree/installer_recipe.go
+++ b/pkg/tree/installer_recipe.go
@@ -34,7 +34,11 @@ const (
 	FinalizerFile = "finalize.yaml"
 )
 
-func NewInstallerRecipe(db pkg.PackageDatabase) Builder { return &InstallerRecipe{Database: db} }
+func NewInstallerRecipe(db pkg.PackageDatabase) Builder {
+	tree := NewDefaultTree()
+	tree.SetPackageSet(db)
+	return &InstallerRecipe{Database: db, PackageTree: tree}
+}
 
 // InstallerRecipe is the "general" reciper for Trees
 type InstallerRecipe struct {