feat: Support for only downloading the latest version of packages

AUTHORS

@@ -74,4 +74,5 @@ List of contributors, in chronological order:
 * JupiterRider (https://github.com/JupiterRider)
 * Agustin Henze (https://github.com/agustinhenze)
 * Tobias Assarsson (https://github.com/daedaluz)
+* Juan Calderon-Perez (https://github.com/gaby)
 * Ato Araki (https://github.com/atotto)

api/mirror.go

@@ -343,6 +343,8 @@ type mirrorUpdateParams struct {
 	ForceUpdate bool `            json:"ForceUpdate"`
 	// Set "true" to skip downloading already downloaded packages
 	SkipExistingPackages bool `   json:"SkipExistingPackages"`
+	// Set "true" to download only the latest version per package/architecture
+	LatestOnly bool `             json:"LatestOnly"`
 }
 
 // @Summary Update Mirror
@@ -434,7 +436,7 @@ func apiMirrorsUpdate(c *gin.Context) {
 		}
 
 		queue, downloadSize, err := remote.BuildDownloadQueue(context.PackagePool(), collectionFactory.PackageCollection(),
-			collectionFactory.ChecksumCollection(nil), b.SkipExistingPackages)
+			collectionFactory.ChecksumCollection(nil), b.SkipExistingPackages, b.LatestOnly)
 		if err != nil {
 			return &task.ProcessReturnValue{Code: http.StatusInternalServerError, Value: nil}, fmt.Errorf("unable to update: %s", err)
 		}

cmd/mirror_update.go

@@ -87,10 +87,11 @@ func aptlyMirrorUpdate(cmd *commander.Command, args []string) error {
 	)
 
 	skipExistingPackages := context.Flags().Lookup("skip-existing-packages").Value.Get().(bool)
+	latestOnly := context.Flags().Lookup("latest").Value.Get().(bool)
 
 	context.Progress().Printf("Building download queue...\n")
 	queue, downloadSize, err = repo.BuildDownloadQueue(context.PackagePool(), collectionFactory.PackageCollection(),
-		collectionFactory.ChecksumCollection(nil), skipExistingPackages)
+		collectionFactory.ChecksumCollection(nil), skipExistingPackages, latestOnly)
 
 	if err != nil {
 		return fmt.Errorf("unable to update: %s", err)
@@ -292,6 +293,7 @@ Example:
 	cmd.Flag.Bool("ignore-checksums", false, "ignore checksum mismatches while downloading package files and metadata")
 	cmd.Flag.Bool("ignore-signatures", false, "disable verification of Release file signatures")
 	cmd.Flag.Bool("skip-existing-packages", false, "do not check file existence for packages listed in the internal database of the mirror")
+	cmd.Flag.Bool("latest", false, "download only latest version of each package (per architecture)")
 	cmd.Flag.Int64("download-limit", 0, "limit download speed (kbytes/sec)")
 	cmd.Flag.String("downloader", "default", "downloader to use (e.g. grab)")
 	cmd.Flag.Int("max-tries", 1, "max download tries till process fails with download error")

completion.d/_aptly

@@ -211,6 +211,7 @@ local keyring="*-keyring=[gpg keyring to use when verifying Release file (could
                             $keyring \
                             "-max-tries=[max download tries till process fails with download error]:number: " \
                             "-skip-existing-packages=[do not check file existence for packages listed in the internal database of the mirror]:$bool" \
+                            "-latest=[download only latest version of each package (per architecture)]:$bool" \
                             "(-)2:mirror name:$mirrors"
                         ;;
                     rename)

completion.d/aptly

@@ -263,7 +263,7 @@ _aptly()
           "update")
             if [[ $numargs -eq 0 ]]; then
               if [[ "$cur" == -* ]]; then
-                COMPREPLY=($(compgen -W "-force -download-limit= -downloader= -ignore-checksums -ignore-signatures -keyring= -skip-existing-packages" -- ${cur}))
+                COMPREPLY=($(compgen -W "-force -download-limit= -downloader= -ignore-checksums -ignore-signatures -keyring= -skip-existing-packages -latest" -- ${cur}))
               else
                 COMPREPLY=($(compgen -W "$(__aptly_mirror_list)" -- ${cur}))
               fi

deb/list.go

@@ -172,6 +172,39 @@ func (l *PackageList) ForEach(handler func(*Package) error) error {
 	return err
 }
 
+// FilterLatest creates a copy of the package list containing only the
+// latest version for each package name/architecture pair.
+func (l *PackageList) FilterLatest() (*PackageList, error) {
+	if l == nil {
+		return nil, fmt.Errorf("package list is nil")
+	}
+
+	filtered := make(map[string]*Package, l.Len())
+
+	err := l.ForEach(func(p *Package) error {
+		key := p.Architecture + "|" + p.Name
+
+		if existing, found := filtered[key]; !found || CompareVersions(p.Version, existing.Version) > 0 {
+			filtered[key] = p
+		}
+
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	result := NewPackageListWithDuplicates(l.duplicatesAllowed, len(filtered))
+
+	for _, pkg := range filtered {
+		if err = result.Add(pkg); err != nil {
+			return nil, err
+		}
+	}
+
+	return result, nil
+}
+
 // ForEachIndexed calls handler for each package in list in indexed order
 func (l *PackageList) ForEachIndexed(handler func(*Package) error) error {
 	if !l.indexed {

deb/list_test.go

@@ -503,3 +503,52 @@ func (s *PackageListSuite) TestArchitectures(c *C) {
 	sort.Strings(archs)
 	c.Check(archs, DeepEquals, []string{"amd64", "arm", "i386", "s390"})
 }
+
+func (s *PackageListSuite) TestFilterLatest(c *C) {
+	list := NewPackageList()
+
+	older := packageStanza.Copy()
+	older["Version"] = "1.0"
+	olderPkg := NewPackageFromControlFile(older)
+	_ = list.Add(olderPkg)
+
+	newer := packageStanza.Copy()
+	newer["Version"] = "2.0"
+	newerPkg := NewPackageFromControlFile(newer)
+	_ = list.Add(newerPkg)
+
+	shared := packageStanza.Copy()
+	shared["Architecture"] = ArchitectureAll
+	shared["Version"] = "3.0"
+	shared["Package"] = "shared"
+	sharedPkg := NewPackageFromControlFile(shared)
+	_ = list.Add(sharedPkg)
+
+	filtered, err := list.FilterLatest()
+	c.Assert(err, IsNil)
+	c.Assert(filtered.Len(), Equals, 2)
+	c.Check(filtered.Has(newerPkg), Equals, true)
+	c.Check(filtered.Has(sharedPkg), Equals, true)
+}
+
+func (s *PackageListSuite) TestFilterLatestPreservesDuplicatesFlag(c *C) {
+	list := NewPackageListWithDuplicates(true, 2)
+
+	_ = list.Add(NewPackageFromControlFile(packageStanza.Copy()))
+
+	another := packageStanza.Copy()
+	another["Version"] = "7.41-1"
+	_ = list.Add(NewPackageFromControlFile(another))
+
+	filtered, err := list.FilterLatest()
+	c.Assert(err, IsNil)
+	c.Assert(filtered.duplicatesAllowed, Equals, true)
+}
+
+func (s *PackageListSuite) TestFilterLatestNil(c *C) {
+	var list *PackageList
+
+	filtered, err := list.FilterLatest()
+	c.Assert(err, ErrorMatches, "package list is nil")
+	c.Assert(filtered, IsNil)
+}

deb/remote.go

@@ -612,7 +612,19 @@ func (repo *RemoteRepo) ApplyFilter(dependencyOptions int, filterQuery PackageQu
 }
 
 // BuildDownloadQueue builds queue, discards current PackageList
-func (repo *RemoteRepo) BuildDownloadQueue(packagePool aptly.PackagePool, packageCollection *PackageCollection, checksumStorage aptly.ChecksumStorage, skipExistingPackages bool) (queue []PackageDownloadTask, downloadSize int64, err error) {
+func (repo *RemoteRepo) BuildDownloadQueue(packagePool aptly.PackagePool, packageCollection *PackageCollection, checksumStorage aptly.ChecksumStorage, skipExistingPackages, latestOnly bool) (queue []PackageDownloadTask, downloadSize int64, err error) {
+	if repo.packageList == nil {
+		err = fmt.Errorf("package list is empty, please (re)download package indexes")
+		return
+	}
+
+	if latestOnly {
+		repo.packageList, err = repo.packageList.FilterLatest()
+		if err != nil {
+			return
+		}
+	}
+
 	queue = make([]PackageDownloadTask, 0, repo.packageList.Len())
 	seen := make(map[string]int, repo.packageList.Len())
 

deb/remote_test.go

@@ -281,7 +281,7 @@ func (s *RemoteRepoSuite) TestDownload(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)
 
-	queue, size, err := s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false)
+	queue, size, err := s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(3))
 	c.Check(queue, HasLen, 1)
@@ -308,7 +308,7 @@ func (s *RemoteRepoSuite) TestDownload(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)
 
-	queue, size, err = s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, true)
+	queue, size, err = s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, true, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(0))
 	c.Check(queue, HasLen, 0)
@@ -329,7 +329,7 @@ func (s *RemoteRepoSuite) TestDownload(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)
 
-	queue, size, err = s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false)
+	queue, size, err = s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(3))
 	c.Check(queue, HasLen, 1)
@@ -356,7 +356,7 @@ func (s *RemoteRepoSuite) TestDownloadWithInstaller(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)
 
-	queue, size, err := s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false)
+	queue, size, err := s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(3)+int64(len(exampleInstallerManifestFile)))
 	c.Check(queue, HasLen, 2)
@@ -382,6 +382,35 @@ func (s *RemoteRepoSuite) TestDownloadWithInstaller(c *C) {
 	c.Check(pkg.Name, Equals, "installer")
 }
 
+func (s *RemoteRepoSuite) TestBuildDownloadQueueLatestOnly(c *C) {
+	s.repo.Architectures = []string{"i386"}
+
+	err := s.repo.Fetch(s.downloader, nil, true)
+	c.Assert(err, IsNil)
+
+	s.downloader.ExpectError("http://mirror.yandex.ru/debian/dists/squeeze/main/binary-i386/Packages.bz2", &http.Error{Code: 404})
+	s.downloader.ExpectError("http://mirror.yandex.ru/debian/dists/squeeze/main/binary-i386/Packages.gz", &http.Error{Code: 404})
+	s.downloader.ExpectResponse("http://mirror.yandex.ru/debian/dists/squeeze/main/binary-i386/Packages", examplePackagesFile)
+
+	err = s.repo.DownloadPackageIndexes(s.progress, s.downloader, nil, s.collectionFactory, true, false)
+	c.Assert(err, IsNil)
+	c.Assert(s.downloader.Empty(), Equals, true)
+
+	stanza := packageStanza.Copy()
+	stanza["Package"] = "amanda-client"
+	stanza["Version"] = "1:3.4.0-1"
+	stanza["Filename"] = "pool/main/a/amanda/amanda-client_3.4.0-1_i386.deb"
+
+	newest := NewPackageFromControlFile(stanza)
+	_ = s.repo.packageList.Add(newest)
+
+	queue, size, err := s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false, true)
+	c.Assert(err, IsNil)
+	c.Check(queue, HasLen, 1)
+	c.Check(queue[0].File.DownloadURL(), Equals, "pool/main/a/amanda/amanda-client_3.4.0-1_i386.deb")
+	c.Check(size, Equals, int64(187518))
+}
+
 func (s *RemoteRepoSuite) TestDownloadWithSources(c *C) {
 	s.repo.Architectures = []string{"i386"}
 	s.repo.DownloadSources = true
@@ -400,7 +429,7 @@ func (s *RemoteRepoSuite) TestDownloadWithSources(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)
 
-	queue, size, err := s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false)
+	queue, size, err := s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(15))
 	c.Check(queue, HasLen, 4)
@@ -444,7 +473,7 @@ func (s *RemoteRepoSuite) TestDownloadWithSources(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)
 
-	queue, size, err = s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, true)
+	queue, size, err = s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, true, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(0))
 	c.Check(queue, HasLen, 0)
@@ -469,7 +498,7 @@ func (s *RemoteRepoSuite) TestDownloadWithSources(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)
 
-	queue, size, err = s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false)
+	queue, size, err = s.repo.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(15))
 	c.Check(queue, HasLen, 4)
@@ -493,7 +522,7 @@ func (s *RemoteRepoSuite) TestDownloadFlat(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(downloader.Empty(), Equals, true)
 
-	queue, size, err := s.flat.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false)
+	queue, size, err := s.flat.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(3))
 	c.Check(queue, HasLen, 1)
@@ -521,7 +550,7 @@ func (s *RemoteRepoSuite) TestDownloadFlat(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(downloader.Empty(), Equals, true)
 
-	queue, size, err = s.flat.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, true)
+	queue, size, err = s.flat.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, true, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(0))
 	c.Check(queue, HasLen, 0)
@@ -543,7 +572,7 @@ func (s *RemoteRepoSuite) TestDownloadFlat(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(downloader.Empty(), Equals, true)
 
-	queue, size, err = s.flat.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false)
+	queue, size, err = s.flat.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(3))
 	c.Check(queue, HasLen, 1)
@@ -574,7 +603,7 @@ func (s *RemoteRepoSuite) TestDownloadWithSourcesFlat(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(downloader.Empty(), Equals, true)
 
-	queue, size, err := s.flat.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false)
+	queue, size, err := s.flat.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(15))
 	c.Check(queue, HasLen, 4)
@@ -620,7 +649,7 @@ func (s *RemoteRepoSuite) TestDownloadWithSourcesFlat(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(downloader.Empty(), Equals, true)
 
-	queue, size, err = s.flat.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, true)
+	queue, size, err = s.flat.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, true, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(0))
 	c.Check(queue, HasLen, 0)
@@ -646,7 +675,7 @@ func (s *RemoteRepoSuite) TestDownloadWithSourcesFlat(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(downloader.Empty(), Equals, true)
 
-	queue, size, err = s.flat.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false)
+	queue, size, err = s.flat.BuildDownloadQueue(s.packagePool, s.collectionFactory.PackageCollection(), s.cs, false, false)
 	c.Assert(err, IsNil)
 	c.Check(size, Equals, int64(15))
 	c.Check(queue, HasLen, 4)

man/aptly.1

@@ -738,6 +738,10 @@ max download tries till process fails with download error
 \-\fBskip\-existing\-packages\fR
 do not check file existence for packages listed in the internal database of the mirror
 .
+.TP
+\-\fBlatest\fR
+download only latest version of each package (per architecture)
+.
 .SH "RENAMES MIRROR"
 \fBaptly\fR \fBmirror\fR \fBrename\fR \fIold\-name\fR \fInew\-name\fR
 .