Tag 0.19.1

Fixes #260
Fixes #223

cmd/root.go

@@ -30,7 +30,7 @@ var cfgFile string
 var Verbose bool
 
 const (
-	LuetCLIVersion = "0.19.0"
+	LuetCLIVersion = "0.19.1"
 	LuetEnvPrefix  = "LUET"
 )
 

pkg/api/core/types/context.go

@@ -28,9 +28,11 @@ import (
 
 	"github.com/kyokomi/emoji"
 	"github.com/mudler/luet/pkg/helpers/terminal"
+	"github.com/pkg/errors"
 	"github.com/pterm/pterm"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
+	"golang.org/x/term"
 )
 
 const (
@@ -48,13 +50,16 @@ type Context struct {
 	NoSpinner  bool
 
 	s           *pterm.SpinnerPrinter
-	spinnerLock sync.Mutex
+	spinnerLock *sync.Mutex
 	z           *zap.Logger
+	AreaPrinter *pterm.AreaPrinter
+	ProgressBar *pterm.ProgressbarPrinter
 }
 
 func NewContext() *Context {
 	return &Context{
-		IsTerminal: terminal.IsTerminal(os.Stdout),
+		spinnerLock: &sync.Mutex{},
+		IsTerminal:  terminal.IsTerminal(os.Stdout),
 		Config: &LuetConfig{
 			ConfigFromHost: true,
 			Logging:        LuetLoggingConfig{},
@@ -68,6 +73,35 @@ func NewContext() *Context {
 	}
 }
 
+func (c *Context) Copy() *Context {
+
+	configCopy := *c.Config
+	configCopy.System = *c.Config.GetSystem()
+	configCopy.General = *c.Config.GetGeneral()
+	configCopy.Logging = *c.Config.GetLogging()
+
+	ctx := *c
+	ctxCopy := &ctx
+	ctxCopy.Config = &configCopy
+
+	return ctxCopy
+}
+
+// GetTerminalSize returns the width and the height of the active terminal.
+func (c *Context) GetTerminalSize() (width, height int, err error) {
+	w, h, err := term.GetSize(int(os.Stdout.Fd()))
+	if w <= 0 {
+		w = 0
+	}
+	if h <= 0 {
+		h = 0
+	}
+	if err != nil {
+		err = errors.New("size not detectable")
+	}
+	return w, h, err
+}
+
 func (c *Context) Init() (err error) {
 	if c.IsTerminal {
 		if !c.Config.Logging.Color {

pkg/api/core/types/repository.go

@@ -37,6 +37,8 @@ type LuetRepository struct {
 	Verify         bool              `json:"verify,omitempty" yaml:"verify,omitempty" mapstructure:"verify"`
 	Arch           string            `json:"arch,omitempty" yaml:"arch,omitempty" mapstructure:"arch"`
 
+	ReferenceID string `json:"reference,omitempty" yaml:"reference,omitempty" mapstructure:"reference"`
+
 	// Incremented value that identify revision of the repository in a user-friendly way.
 	Revision int `json:"revision,omitempty" yaml:"-" mapstructure:"-"`
 	// Epoch time in seconds

pkg/compiler/backend/simpledocker.go

@@ -56,7 +56,7 @@ func (s *SimpleDocker) BuildImage(opts Options) error {
 		return err
 	}
 
-	s.ctx.Info(":whale: Building image " + name + " done")
+	s.ctx.Success(":whale: Building image " + name + " done")
 
 	bus.Manager.Publish(bus.EventImagePostBuild, opts)
 
@@ -70,7 +70,7 @@ func (s *SimpleDocker) CopyImage(src, dst string) error {
 	if err != nil {
 		return errors.Wrap(err, "Failed tagging image: "+string(out))
 	}
-	s.ctx.Info(":whale: Tagged image:", src, "->", dst)
+	s.ctx.Success(":whale: Tagged image:", src, "->", dst)
 	return nil
 }
 
@@ -90,7 +90,7 @@ func (s *SimpleDocker) DownloadImage(opts Options) error {
 		return errors.Wrap(err, "Failed pulling image: "+string(out))
 	}
 
-	s.ctx.Info(":whale: Downloaded image:", name)
+	s.ctx.Success(":whale: Downloaded image:", name)
 	bus.Manager.Publish(bus.EventImagePostPull, opts)
 
 	return nil
@@ -120,7 +120,7 @@ func (s *SimpleDocker) RemoveImage(opts Options) error {
 	if err != nil {
 		return errors.Wrap(err, "Failed removing image: "+string(out))
 	}
-	s.ctx.Info(":whale: Removed image:", name)
+	s.ctx.Success(":whale: Removed image:", name)
 	//Info(string(out))
 	return nil
 }
@@ -137,7 +137,7 @@ func (s *SimpleDocker) Push(opts Options) error {
 	if err != nil {
 		return errors.Wrap(err, "Failed pushing image: "+string(out))
 	}
-	s.ctx.Info(":whale: Pushed image:", name)
+	s.ctx.Success(":whale: Pushed image:", name)
 	bus.Manager.Publish(bus.EventImagePostPush, opts)
 
 	//Info(string(out))

pkg/compiler/compiler.go

@@ -447,7 +447,7 @@ func (cs *LuetCompiler) genArtifact(p *compilerspec.LuetCompilationSpec, builder
 		if err != nil {
 			return a, errors.Wrap(err, "Failed while writing metadata file")
 		}
-		cs.Options.Context.Info(pkgTag, "   :white_check_mark: done (empty virtual package)")
+		cs.Options.Context.Success(pkgTag, "   :white_check_mark: done (empty virtual package)")
 		return a, nil
 	}
 
@@ -477,7 +477,7 @@ func (cs *LuetCompiler) genArtifact(p *compilerspec.LuetCompilationSpec, builder
 	if err != nil {
 		return a, errors.Wrap(err, "Failed while writing metadata file")
 	}
-	cs.Options.Context.Info(pkgTag, "   :white_check_mark: Done")
+	cs.Options.Context.Success(pkgTag, "   :white_check_mark: Done")
 
 	return a, nil
 }
@@ -965,7 +965,7 @@ func (cs *LuetCompiler) resolveMultiStageImages(concurrency int, keepPermissions
 				Source:      c.Source,
 				Destination: c.Destination,
 			})
-			cs.Options.Context.Info(copyTag2, ":white_check_mark: Done")
+			cs.Options.Context.Success(copyTag2, ":white_check_mark: Done")
 		} else {
 			resolvedCopyFields = append(resolvedCopyFields, c)
 		}
@@ -1128,7 +1128,7 @@ func (cs *LuetCompiler) compile(concurrency int, keepPermissions bool, generateF
 
 			a.PackageCacheImage = assertion.Hash.PackageHash
 
-			cs.Options.Context.Info(pkgTag, ":white_check_mark: Done")
+			cs.Options.Context.Success(pkgTag, ":white_check_mark: Done")
 
 			bus.Manager.Publish(bus.EventPackagePostBuild, struct {
 				CompileSpec *compilerspec.LuetCompilationSpec

pkg/installer/client/http.go

@@ -38,8 +38,6 @@ type HttpClient struct {
 	RepoData RepoData
 	Cache    *artifact.ArtifactCache
 	context  *types.Context
-
-	ProgressBarArea *pterm.AreaPrinter
 }
 
 func NewHttpClient(r RepoData, ctx *types.Context) *HttpClient {
@@ -126,11 +124,16 @@ func (c *HttpClient) DownloadFile(p string) (string, error) {
 		}
 
 		resp := client.Do(req)
-		pb := pterm.DefaultProgressbar.WithTotal(int(resp.Size()))
-		if c.ProgressBarArea != nil {
-			pb = pb.WithPrintTogether(c.ProgressBarArea)
+
+		// Initialize a progressbar only if we have one in the current context
+		var pb *pterm.ProgressbarPrinter
+		if c.context.ProgressBar != nil {
+			pb = pterm.DefaultProgressbar.WithTotal(int(resp.Size()))
+			if c.context.AreaPrinter != nil {
+				pb = pb.WithPrintTogether(c.context.AreaPrinter)
+			}
+			pb, _ = pb.WithTitle(filepath.Base(resp.Request.HTTPRequest.URL.RequestURI())).Start()
 		}
-		pb, _ = pb.WithTitle(filepath.Base(resp.Request.HTTPRequest.URL.RequestURI())).Start()
 		// start download loop
 		t := time.NewTicker(500 * time.Millisecond)
 		defer t.Stop()
@@ -140,11 +143,15 @@ func (c *HttpClient) DownloadFile(p string) (string, error) {
 		for {
 			select {
 			case <-t.C:
-				//	bar.Set64(resp.BytesComplete())
-				//pb.Increment()
-				pb.Increment().Current = int(resp.BytesComplete())
+				//	update the progress bar
+				if pb != nil {
+					pb.Increment().Current = int(resp.BytesComplete())
+				}
 			case <-resp.Done:
-				pb.Increment().Current = int(resp.BytesComplete())
+				//	update the progress bar
+				if pb != nil {
+					pb.Increment().Current = int(resp.BytesComplete())
+				}
 				// download is complete
 				break download_loop
 			}
@@ -157,7 +164,11 @@ func (c *HttpClient) DownloadFile(p string) (string, error) {
 		c.context.Info("Downloaded", p, "of",
 			fmt.Sprintf("%.2f", (float64(resp.BytesComplete())/1000)/1000), "MB (",
 			fmt.Sprintf("%.2f", (float64(resp.BytesPerSecond())/1024)/1024), "MiB/s )")
-		pb.Stop()
+
+		if pb != nil {
+			// stop the progressbar if active
+			pb.Stop()
+		}
 		//bar.Finish()
 		downloaded = true
 		break

pkg/installer/installer.go

@@ -32,7 +32,6 @@ import (
 	"github.com/mudler/luet/pkg/helpers"
 	fileHelper "github.com/mudler/luet/pkg/helpers/file"
 	"github.com/mudler/luet/pkg/helpers/match"
-	"github.com/mudler/luet/pkg/installer/client"
 	pkg "github.com/mudler/luet/pkg/package"
 	"github.com/mudler/luet/pkg/solver"
 	"github.com/pterm/pterm"
@@ -566,21 +565,30 @@ func (l *LuetInstaller) download(syncedRepos Repositories, toDownload map[string
 
 	var wg = new(sync.WaitGroup)
 
-	area, _ := pterm.DefaultArea.Start()
+	ctx := l.Options.Context.Copy()
 
-	p, _ := pterm.DefaultProgressbar.WithPrintTogether(area).WithTotal(len(toDownload)).WithTitle("Downloading packages").Start()
+	// Check if the terminal is big enough to display a progress bar
+	// https://github.com/pterm/pterm/blob/4c725e56bfd9eb38e1c7b9dec187b50b93baa8bd/progressbar_printer.go#L190
+	w, _, err := ctx.GetTerminalSize()
+	if ctx.IsTerminal && err == nil && w > 100 {
+		area, _ := pterm.DefaultArea.Start()
+		p, _ := pterm.DefaultProgressbar.WithPrintTogether(area).WithTotal(len(toDownload)).WithTitle("Downloading packages").Start()
+
+		ctx.AreaPrinter = area
+		ctx.ProgressBar = p
+		defer area.Stop()
+	}
 
 	// Download
 	for i := 0; i < l.Options.Concurrency; i++ {
 		wg.Add(1)
-		go l.downloadWorker(i, wg, all, p, area)
+		go l.downloadWorker(i, wg, all, ctx)
 	}
 	for _, c := range toDownload {
 		all <- c
 	}
 	close(all)
 	wg.Wait()
-	area.Stop()
 
 	return nil
 }
@@ -772,7 +780,7 @@ func (l *LuetInstaller) checkFileconflicts(toInstall map[string]ArtifactMatch, c
 
 	filesToInstall := []string{}
 	for _, m := range toInstall {
-		a, err := l.downloadPackage(m, nil)
+		a, err := l.downloadPackage(m, l.Options.Context)
 		if err != nil && !l.Options.Force {
 			return errors.Wrap(err, "Failed downloading package")
 		}
@@ -867,14 +875,9 @@ func (l *LuetInstaller) install(o Option, syncedRepos Repositories, toInstall ma
 	return s.ExecuteFinalizers(l.Options.Context, toFinalize)
 }
 
-func (l *LuetInstaller) downloadPackage(a ArtifactMatch, area *pterm.AreaPrinter) (*artifact.PackageArtifact, error) {
+func (l *LuetInstaller) downloadPackage(a ArtifactMatch, ctx *types.Context) (*artifact.PackageArtifact, error) {
 
-	cli := a.Repository.Client(l.Options.Context)
-
-	switch v := cli.(type) {
-	case *client.HttpClient:
-		v.ProgressBarArea = area
-	}
+	cli := a.Repository.Client(ctx)
 
 	artifact, err := cli.DownloadArtifact(a.Artifact)
 	if err != nil {
@@ -890,7 +893,7 @@ func (l *LuetInstaller) downloadPackage(a ArtifactMatch, area *pterm.AreaPrinter
 
 func (l *LuetInstaller) installPackage(m ArtifactMatch, s *System) error {
 
-	a, err := l.downloadPackage(m, nil)
+	a, err := l.downloadPackage(m, l.Options.Context)
 	if err != nil && !l.Options.Force {
 		return errors.Wrap(err, "Failed downloading package")
 	}
@@ -910,20 +913,21 @@ func (l *LuetInstaller) installPackage(m ArtifactMatch, s *System) error {
 	return s.Database.SetPackageFiles(&pkg.PackageFile{PackageFingerprint: m.Package.GetFingerPrint(), Files: files})
 }
 
-func (l *LuetInstaller) downloadWorker(i int, wg *sync.WaitGroup, c <-chan ArtifactMatch, pb *pterm.ProgressbarPrinter, area *pterm.AreaPrinter) error {
+func (l *LuetInstaller) downloadWorker(i int, wg *sync.WaitGroup, c <-chan ArtifactMatch, ctx *types.Context) error {
 	defer wg.Done()
 
 	for p := range c {
 		// TODO: Keep trace of what was added from the tar, and save it into system
-		_, err := l.downloadPackage(p, area)
+		_, err := l.downloadPackage(p, ctx)
 		if err != nil {
 			l.Options.Context.Error("Failed downloading package "+p.Package.GetName(), err.Error())
 			return errors.Wrap(err, "Failed downloading package "+p.Package.GetName())
 		} else {
 			l.Options.Context.Success(":package: Package ", p.Package.HumanReadableString(), "downloaded")
 		}
-		pb.Increment()
-
+		if ctx.ProgressBar != nil {
+			ctx.ProgressBar.Increment()
+		}
 	}
 
 	return nil

pkg/installer/repository.go

@@ -539,6 +539,7 @@ func (r *LuetSystemRepository) AddMetadata(ctx *types.Context, repospec, dst str
 	if err != nil {
 		return nil, err
 	}
+
 	a, err := r.AddRepositoryFile(metaTmpDir, REPOFILE_META_KEY, dst, NewDefaultMetaRepositoryFile())
 	if err != nil {
 		return a, errors.Wrap(err, "Error met while adding archive to repository")
@@ -558,7 +559,7 @@ func (r *LuetSystemRepository) AddMetadata(ctx *types.Context, repospec, dst str
 // AddTree adds a tree.Builder with the given key to the repository.
 // It will generate an artifact which will be then embedded in the repository manifest
 // It returns the generated artifacts and an error
-func (r *LuetSystemRepository) AddTree(ctx *types.Context, t tree.Builder, dst, key string, f LuetRepositoryFile) (*artifact.PackageArtifact, error) {
+func (r *LuetSystemRepository) AddTree(ctx *types.Context, t tree.Builder, dst, key string, defaults LuetRepositoryFile) (*artifact.PackageArtifact, error) {
 	// Create tree and repository file
 	archive, err := ctx.Config.GetSystem().TempDir("archive")
 	if err != nil {
@@ -570,13 +571,70 @@ func (r *LuetSystemRepository) AddTree(ctx *types.Context, t tree.Builder, dst,
 		return nil, errors.Wrap(err, "Error met while saving the tree")
 	}
 
-	a, err := r.AddRepositoryFile(archive, key, dst, f)
+	a, err := r.AddRepositoryFile(archive, key, dst, defaults)
 	if err != nil {
 		return nil, errors.Wrap(err, "Error met while adding archive to repository")
 	}
 	return a, nil
 }
 
+// Snapshot creates a copy of the current repository index into dst.
+// The copy will be prefixed with "id".
+// This allows the clients to refer to old versions of the repository by using the reference_id
+func (r *LuetSystemRepository) Snapshot(id, dst string) (artifacts []*artifact.PackageArtifact, snapshotIndex string, err error) {
+
+	var snapshotFmt string = "%s-%s"
+
+	repospec := filepath.Join(dst, REPOSITORY_SPECFILE)
+	snapshotIndex = filepath.Join(dst, fmt.Sprintf(snapshotFmt, id, REPOSITORY_SPECFILE))
+
+	err = fileHelper.CopyFile(repospec, filepath.Join(dst, snapshotIndex))
+	if err != nil {
+		err = errors.Wrap(err, "while copying repo spec")
+		return
+	}
+
+	b, err := ioutil.ReadFile(repospec)
+	if err != nil {
+		return
+	}
+
+	newRepoIndex := &LuetSystemRepository{}
+	err = yaml.Unmarshal(b, newRepoIndex)
+	if err != nil {
+		return
+	}
+
+	for _, key := range []string{REPOFILE_META_KEY, REPOFILE_TREE_KEY, REPOFILE_COMPILER_TREE_KEY} {
+		var luetFile LuetRepositoryFile
+		luetFile, err = r.GetRepositoryFile(key)
+		if err != nil {
+			return
+		}
+		newMetaFile := fmt.Sprintf(snapshotFmt, id, luetFile.FileName)
+		err = fileHelper.CopyFile(filepath.Join(dst, luetFile.FileName), filepath.Join(dst, newMetaFile))
+		if err != nil {
+			return
+		}
+
+		m := &luetFile
+		m.FileName = newMetaFile
+		newRepoIndex.RepositoryFiles[key] = *m
+		artifacts = append(artifacts, artifact.NewPackageArtifact(filepath.Join(dst, newMetaFile)))
+	}
+
+	_, serialized := newRepoIndex.Serialize()
+
+	data, err := yaml.Marshal(serialized)
+	if err != nil {
+		return
+	}
+
+	err = ioutil.WriteFile(snapshotIndex, data, os.ModePerm)
+
+	return
+}
+
 // AddRepositoryFile adds a path to a key in the repository manifest.
 // The path will be compressed, and a default File has to be passed in case there is no entry into
 // the repository manifest
@@ -772,6 +830,14 @@ func (r *LuetSystemRepository) SyncBuildMetadata(ctx *types.Context, path string
 	return nil
 }
 
+func (r *LuetSystemRepository) referenceID() string {
+	repositoryReferenceID := REPOSITORY_SPECFILE
+	if r.ReferenceID != "" {
+		repositoryReferenceID = r.ReferenceID
+	}
+	return repositoryReferenceID
+}
+
 func (r *LuetSystemRepository) Sync(ctx *types.Context, force bool) (*LuetSystemRepository, error) {
 	var repoUpdated bool = false
 	var treefs, metafs string
@@ -782,10 +848,12 @@ func (r *LuetSystemRepository) Sync(ctx *types.Context, force bool) (*LuetSystem
 		return nil, errors.New("no client could be generated from repository")
 	}
 
+	repositoryReferenceID := r.referenceID()
+
 	// Retrieve remote repository.yaml for retrieve revision and date
-	file, err := c.DownloadFile(REPOSITORY_SPECFILE)
+	file, err := c.DownloadFile(repositoryReferenceID)
 	if err != nil {
-		return nil, errors.Wrap(err, "while downloading "+REPOSITORY_SPECFILE)
+		return nil, errors.Wrap(err, "while downloading "+repositoryReferenceID)
 	}
 
 	repobasedir := ctx.Config.GetSystem().GetRepoDatabaseDirPath(r.GetName())
@@ -799,7 +867,7 @@ func (r *LuetSystemRepository) Sync(ctx *types.Context, force bool) (*LuetSystem
 
 	if r.Cached {
 		if !force {
-			localRepo, _ := r.ReadSpecFile(filepath.Join(repobasedir, REPOSITORY_SPECFILE))
+			localRepo, _ := r.ReadSpecFile(filepath.Join(repobasedir, repositoryReferenceID))
 			if localRepo != nil {
 				if localRepo.GetRevision() == downloadedRepoMeta.GetRevision() &&
 					localRepo.GetLastUpdate() == downloadedRepoMeta.GetLastUpdate() {
@@ -850,9 +918,9 @@ func (r *LuetSystemRepository) Sync(ctx *types.Context, force bool) (*LuetSystem
 
 		if r.Cached {
 			// Copy updated repository.yaml file to repo dir now that the tree is synced.
-			err = fileHelper.CopyFile(file, filepath.Join(repobasedir, REPOSITORY_SPECFILE))
+			err = fileHelper.CopyFile(file, filepath.Join(repobasedir, repositoryReferenceID))
 			if err != nil {
-				return nil, errors.Wrap(err, "Error on update "+REPOSITORY_SPECFILE)
+				return nil, errors.Wrap(err, "Error on update "+repositoryReferenceID)
 			}
 			// Remove previous tree
 			os.RemoveAll(treefs)

pkg/installer/repository_docker.go

@@ -136,7 +136,7 @@ func (d *dockerRepositoryGenerator) pushFileFromArtifact(a *artifact.PackageArti
 	return nil
 }
 
-func (d *dockerRepositoryGenerator) pushRepoMetadata(repospec string, r *LuetSystemRepository) error {
+func (d *dockerRepositoryGenerator) pushRepoMetadata(repospec, tag string, r *LuetSystemRepository) error {
 	// create temp dir for metafile
 	metaDir, err := d.context.Config.GetSystem().TempDir("metadata")
 	if err != nil {
@@ -144,13 +144,13 @@ func (d *dockerRepositoryGenerator) pushRepoMetadata(repospec string, r *LuetSys
 	}
 	defer os.RemoveAll(metaDir) // clean up
 
-	tempRepoFile := filepath.Join(metaDir, REPOSITORY_SPECFILE+".tar")
+	tempRepoFile := filepath.Join(metaDir, tag+".tar")
 	if err := helpers.Tar(repospec, tempRepoFile); err != nil {
 		return errors.Wrap(err, "Error met while archiving repository file")
 	}
 
 	a := artifact.NewPackageArtifact(tempRepoFile)
-	imageRepo := fmt.Sprintf("%s:%s", d.imagePrefix, REPOSITORY_SPECFILE)
+	imageRepo := fmt.Sprintf("%s:%s", d.imagePrefix, tag)
 
 	if err := d.pushFileFromArtifact(a, imageRepo); err != nil {
 		return errors.Wrap(err, "while pushing file from artifact")
@@ -242,14 +242,7 @@ func (d *dockerRepositoryGenerator) Generate(r *LuetSystemRepository, imagePrefi
 		return errors.Wrap(err, "error met while pushing compiler tree")
 	}
 
-	// create temp dir for metafile
-	metaDir, err := d.context.Config.GetSystem().TempDir("metadata")
-	if err != nil {
-		return errors.Wrap(err, "error met while creating tempdir for metadata")
-	}
-	defer os.RemoveAll(metaDir) // clean up
-
-	a, err = r.AddMetadata(d.context, repospec, metaDir)
+	a, err = r.AddMetadata(d.context, repospec, repoTemp)
 	if err != nil {
 		return errors.Wrap(err, "failed adding Metadata file to repository")
 	}
@@ -258,10 +251,28 @@ func (d *dockerRepositoryGenerator) Generate(r *LuetSystemRepository, imagePrefi
 		return errors.Wrap(err, "error met while pushing docker image from artifact")
 	}
 
-	if err := d.pushRepoMetadata(repospec, r); err != nil {
+	if err := d.pushRepoMetadata(repospec, REPOSITORY_SPECFILE, r); err != nil {
 		return errors.Wrap(err, "while pushing repository metadata tree")
 	}
 
+	// Create a named snapshot and push it.
+	// It edits the metadata pointing at the repository files associated with the snapshot
+	// And copies the new files
+	id := time.Now().Format("20060102150405")
+	artifacts, snapshotRepoFile, err := r.Snapshot(id, repoTemp)
+	if err != nil {
+		return errors.Wrap(err, "while creating snapshot")
+	}
+	if err := d.pushRepoMetadata(snapshotRepoFile, filepath.Base(snapshotRepoFile), r); err != nil {
+		return errors.Wrap(err, "while pushing repository snapshot metadata tree")
+	}
+
+	for _, a := range artifacts {
+		if err := d.pushImageFromArtifact(a, d.b, false); err != nil {
+			return errors.Wrap(err, "error met while pushing docker image from artifact")
+		}
+	}
+
 	bus.Manager.Publish(bus.EventRepositoryPostBuild, struct {
 		Repo LuetSystemRepository
 		Path string

pkg/installer/repository_local.go

@@ -121,6 +121,13 @@ func (g *localRepositoryGenerator) Generate(r *LuetSystemRepository, dst string,
 		return errors.Wrap(err, "failed adding Metadata file to repository")
 	}
 
+	// Create named snapshot.
+	// It edits the metadata pointing at the repository files associated with the snapshot
+	// And copies the new files
+	if _, _, err := r.Snapshot(time.Now().Format("20060102150405"), dst); err != nil {
+		return errors.Wrap(err, "while creating snapshot")
+	}
+
 	bus.Manager.Publish(bus.EventRepositoryPostBuild, struct {
 		Repo LuetSystemRepository
 		Path string

pkg/installer/repository_test.go

@@ -218,6 +218,124 @@ urls:
 			Expect(err).To(HaveOccurred()) // should throw error
 		})
 
+		It("Generates snapshots", func() {
+
+			tmpdir, err := ioutil.TempDir("", "tree")
+			Expect(err).ToNot(HaveOccurred())
+			defer os.RemoveAll(tmpdir) // clean up
+
+			generalRecipe := tree.NewCompilerRecipe(pkg.NewInMemoryDatabase(false))
+
+			err = generalRecipe.Load("../../tests/fixtures/buildable")
+			Expect(err).ToNot(HaveOccurred())
+
+			generalRecipe2 := tree.NewCompilerRecipe(pkg.NewInMemoryDatabase(false))
+
+			err = generalRecipe2.Load("../../tests/fixtures/finalizers")
+			Expect(err).ToNot(HaveOccurred())
+
+			Expect(len(generalRecipe2.GetDatabase().GetPackages())).To(Equal(1))
+			Expect(len(generalRecipe.GetDatabase().GetPackages())).To(Equal(3))
+
+			compiler2 := compiler.NewLuetCompiler(backend.NewSimpleDockerBackend(ctx), generalRecipe2.GetDatabase(), options.WithContext(ctx))
+			spec2, err := compiler2.FromPackage(&pkg.DefaultPackage{Name: "alpine", Category: "seed", Version: "1.0"})
+			Expect(err).ToNot(HaveOccurred())
+
+			compiler := compiler.NewLuetCompiler(backend.NewSimpleDockerBackend(ctx), generalRecipe.GetDatabase(), options.WithContext(ctx))
+
+			spec, err := compiler.FromPackage(&pkg.DefaultPackage{Name: "b", Category: "test", Version: "1.0"})
+			Expect(err).ToNot(HaveOccurred())
+
+			Expect(spec.GetPackage().GetPath()).ToNot(Equal(""))
+			Expect(spec2.GetPackage().GetPath()).ToNot(Equal(""))
+
+			tmpdir, err = ioutil.TempDir("", "tree")
+			Expect(err).ToNot(HaveOccurred())
+			defer os.RemoveAll(tmpdir) // clean up
+
+			Expect(spec.BuildSteps()).To(Equal([]string{"echo artifact5 > /test5", "echo artifact6 > /test6", "chmod +x generate.sh", "./generate.sh"}))
+			Expect(spec.GetPreBuildSteps()).To(Equal([]string{"echo foo > /test", "echo bar > /test2"}))
+
+			spec.SetOutputPath(tmpdir)
+			spec2.SetOutputPath(tmpdir)
+
+			artifact, err := compiler.Compile(false, spec)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(fileHelper.Exists(artifact.Path)).To(BeTrue())
+			Expect(helpers.Untar(artifact.Path, tmpdir, false)).ToNot(HaveOccurred())
+
+			artifact2, err := compiler2.Compile(false, spec2)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(fileHelper.Exists(artifact2.Path)).To(BeTrue())
+			Expect(helpers.Untar(artifact2.Path, tmpdir, false)).ToNot(HaveOccurred())
+
+			Expect(fileHelper.Exists(spec.Rel("test5"))).To(BeTrue())
+			Expect(fileHelper.Exists(spec.Rel("test6"))).To(BeTrue())
+
+			content1, err := fileHelper.Read(spec.Rel("test5"))
+			Expect(err).ToNot(HaveOccurred())
+			content2, err := fileHelper.Read(spec.Rel("test6"))
+			Expect(err).ToNot(HaveOccurred())
+			Expect(content1).To(Equal("artifact5\n"))
+			Expect(content2).To(Equal("artifact6\n"))
+
+			// will contain both
+			Expect(fileHelper.Exists(spec.Rel("b-test-1.0.package.tar"))).To(BeTrue())
+			Expect(fileHelper.Exists(spec.Rel("b-test-1.0.metadata.yaml"))).To(BeTrue())
+			Expect(fileHelper.Exists(spec2.Rel("alpine-seed-1.0.package.tar"))).To(BeTrue())
+			Expect(fileHelper.Exists(spec2.Rel("alpine-seed-1.0.metadata.yaml"))).To(BeTrue())
+
+			repo, err := GenerateRepository(
+				WithName("test"),
+				WithDescription("description"),
+				WithType("disk"),
+				WithUrls(tmpdir),
+				WithPriority(1),
+				WithSource(tmpdir),
+				FromMetadata(true), // Enabling from metadata makes the package visible
+				WithTree("../../tests/fixtures/buildable"),
+				WithContext(ctx),
+				WithDatabase(pkg.NewInMemoryDatabase(false)),
+			)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(repo.GetName()).To(Equal("test"))
+			Expect(fileHelper.Exists(spec.Rel(REPOSITORY_SPECFILE))).ToNot(BeTrue())
+			Expect(fileHelper.Exists(spec.Rel(TREE_TARBALL + ".gz"))).ToNot(BeTrue())
+			Expect(fileHelper.Exists(spec.Rel(REPOSITORY_METAFILE + ".tar"))).ToNot(BeTrue())
+			err = repo.Write(ctx, tmpdir, false, true)
+			Expect(err).ToNot(HaveOccurred())
+
+			Expect(fileHelper.Exists(spec.Rel(REPOSITORY_SPECFILE))).To(BeTrue())
+			Expect(fileHelper.Exists(spec.Rel(TREE_TARBALL + ".gz"))).To(BeTrue())
+			Expect(fileHelper.Exists(spec.Rel(REPOSITORY_METAFILE + ".tar"))).To(BeTrue())
+
+			artifacts, index, err := repo.Snapshot("foo", tmpdir)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(len(artifacts)).To(Equal(3))
+			Expect(index).To(ContainSubstring("foo-repository.yaml"))
+			r := &LuetSystemRepository{}
+
+			r, err = r.ReadSpecFile(index)
+			Expect(err).ToNot(HaveOccurred())
+
+			Expect(err).ToNot(HaveOccurred())
+
+			Expect(len(r.RepositoryFiles)).To(Equal(3))
+
+			for k, v := range r.RepositoryFiles {
+				_, err := os.Stat(filepath.Join(tmpdir, "foo-compilertree.tar.gz"))
+				Expect(err).ToNot(HaveOccurred())
+				switch k {
+				case REPOFILE_COMPILER_TREE_KEY:
+					Expect(v.FileName).To(Equal("foo-compilertree.tar.gz"))
+				case REPOFILE_META_KEY:
+					Expect(v.FileName).To(Equal("foo-repository.meta.yaml.tar"))
+				case REPOFILE_TREE_KEY:
+					Expect(v.FileName).To(Equal("foo-tree.tar.gz"))
+				}
+			}
+		})
+
 		It("Generate repository metadata of files referenced in a tree and from packages", func() {
 
 			tmpdir, err := ioutil.TempDir("", "tree")