Rework HTTP downloader retry logic

Apply retries as global, config-level option `downloadRetries` so that it can be applied to any aptly command which downloads objects. Unwrap `errors.Wrap` which is used in downloader. Unwrap `*url.Error` which should be the actual error returned from the HTTP client, catch more cases, be more specific around failures.
2026-01-12 03:21:33 +00:00 · 2019-08-06 00:41:14 +03:00
parent 2e7f624b34
commit f0a370db24
22 changed files with 123 additions and 63 deletions
--- a/aptly/interfaces.go
+++ b/aptly/interfaces.go
@@ -127,7 +127,7 @@ type Downloader interface {
 	// Download starts new download task
 	Download(ctx context.Context, url string, destination string) error
 	// DownloadWithChecksum starts new download task with checksum verification
-	DownloadWithChecksum(ctx context.Context, url string, destination string, expected *utils.ChecksumInfo, ignoreMismatch bool, maxTries int) error
+	DownloadWithChecksum(ctx context.Context, url string, destination string, expected *utils.ChecksumInfo, ignoreMismatch bool) error
 	// GetProgress returns Progress object
 	GetProgress() Progress
 	// GetLength returns size by heading object with url
--- a/cmd/mirror_update.go
+++ b/cmd/mirror_update.go
@@ -41,7 +41,6 @@ func aptlyMirrorUpdate(cmd *commander.Command, args []string) error {
 	}

 	ignoreMismatch := context.Flags().Lookup("ignore-checksums").Value.Get().(bool)
-	maxTries := context.Flags().Lookup("max-tries").Value.Get().(int)

 	verifier, err := getVerifier(context.Flags())
 	if err != nil {
@@ -54,7 +53,7 @@ func aptlyMirrorUpdate(cmd *commander.Command, args []string) error {
 	}

 	context.Progress().Printf("Downloading & parsing package files...\n")
-	err = repo.DownloadPackageIndexes(context.Progress(), context.Downloader(), verifier, context.CollectionFactory(), ignoreMismatch, maxTries)
+	err = repo.DownloadPackageIndexes(context.Progress(), context.Downloader(), verifier, context.CollectionFactory(), ignoreMismatch)
 	if err != nil {
 		return fmt.Errorf("unable to update: %s", err)
 	}
@@ -173,8 +172,7 @@ func aptlyMirrorUpdate(cmd *commander.Command, args []string) error {
 						repo.PackageURL(task.File.DownloadURL()).String(),
 						task.TempDownPath,
 						&task.File.Checksums,
-						ignoreMismatch,
-						maxTries)
+						ignoreMismatch)
 					if e != nil {
 						pushError(e)
 						continue
--- a/context/context.go
+++ b/context/context.go
@@ -213,7 +213,15 @@ func (context *AptlyContext) Downloader() aptly.Downloader {
 		if downloadLimit == 0 {
 			downloadLimit = context.config().DownloadLimit
 		}
-		context.downloader = http.NewDownloader(downloadLimit*1024, context._progress())
+		maxTries := context.config().DownloadRetries + 1
+		maxTriesFlag := context.flags.Lookup("max-tries")
+		if maxTriesFlag != nil {
+			maxTriesFlagValue := maxTriesFlag.Value.Get().(int)
+			if maxTriesFlagValue > maxTries {
+				maxTries = maxTriesFlagValue
+			}
+		}
+		context.downloader = http.NewDownloader(downloadLimit*1024, maxTries, context._progress())
 	}

 	return context.downloader
--- a/deb/remote.go
+++ b/deb/remote.go
@@ -423,7 +423,7 @@ ok:

 // DownloadPackageIndexes downloads & parses package index files
 func (repo *RemoteRepo) DownloadPackageIndexes(progress aptly.Progress, d aptly.Downloader, verifier pgp.Verifier, collectionFactory *CollectionFactory,
-	ignoreMismatch bool, maxTries int) error {
+	ignoreMismatch bool) error {
 	if repo.packageList != nil {
 		panic("packageList != nil")
 	}
@@ -456,7 +456,7 @@ func (repo *RemoteRepo) DownloadPackageIndexes(progress aptly.Progress, d aptly.

 	for _, info := range packagesPaths {
 		path, kind, component, architecture := info[0], info[1], info[2], info[3]
-		packagesReader, packagesFile, err := http.DownloadTryCompression(gocontext.TODO(), d, repo.IndexesRootURL(), path, repo.ReleaseFiles, ignoreMismatch, maxTries)
+		packagesReader, packagesFile, err := http.DownloadTryCompression(gocontext.TODO(), d, repo.IndexesRootURL(), path, repo.ReleaseFiles, ignoreMismatch)

 		isInstaller := kind == PackageTypeInstaller
 		if err != nil {
--- a/deb/remote_test.go
+++ b/deb/remote_test.go
@@ -276,7 +276,7 @@ func (s *RemoteRepoSuite) TestDownload(c *C) {
 	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, false, 1)
+	err = s.repo.DownloadPackageIndexes(s.progress, s.downloader, nil, s.collectionFactory, false)
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)

@@ -303,7 +303,7 @@ func (s *RemoteRepoSuite) TestDownload(c *C) {
 	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, false, 1)
+	err = s.repo.DownloadPackageIndexes(s.progress, s.downloader, nil, s.collectionFactory, false)
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)

@@ -324,7 +324,7 @@ func (s *RemoteRepoSuite) TestDownload(c *C) {
 	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, false, 1)
+	err = s.repo.DownloadPackageIndexes(s.progress, s.downloader, nil, s.collectionFactory, false)
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)

@@ -351,7 +351,7 @@ func (s *RemoteRepoSuite) TestDownloadWithInstaller(c *C) {
 	s.downloader.ExpectResponse("http://mirror.yandex.ru/debian/dists/squeeze/main/installer-i386/current/images/SHA256SUMS", exampleInstallerHashSumFile)
 	s.downloader.ExpectResponse("http://mirror.yandex.ru/debian/dists/squeeze/main/installer-i386/current/images/MANIFEST", exampleInstallerManifestFile)

-	err = s.repo.DownloadPackageIndexes(s.progress, s.downloader, nil, s.collectionFactory, false, 1)
+	err = s.repo.DownloadPackageIndexes(s.progress, s.downloader, nil, s.collectionFactory, false)
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)

@@ -395,7 +395,7 @@ func (s *RemoteRepoSuite) TestDownloadWithSources(c *C) {
 	s.downloader.ExpectError("http://mirror.yandex.ru/debian/dists/squeeze/main/source/Sources.gz", &http.Error{Code: 404})
 	s.downloader.ExpectResponse("http://mirror.yandex.ru/debian/dists/squeeze/main/source/Sources", exampleSourcesFile)

-	err = s.repo.DownloadPackageIndexes(s.progress, s.downloader, nil, s.collectionFactory, false, 1)
+	err = s.repo.DownloadPackageIndexes(s.progress, s.downloader, nil, s.collectionFactory, false)
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)

@@ -439,7 +439,7 @@ func (s *RemoteRepoSuite) TestDownloadWithSources(c *C) {
 	s.downloader.ExpectError("http://mirror.yandex.ru/debian/dists/squeeze/main/source/Sources.gz", &http.Error{Code: 404})
 	s.downloader.ExpectResponse("http://mirror.yandex.ru/debian/dists/squeeze/main/source/Sources", exampleSourcesFile)

-	err = s.repo.DownloadPackageIndexes(s.progress, s.downloader, nil, s.collectionFactory, false, 1)
+	err = s.repo.DownloadPackageIndexes(s.progress, s.downloader, nil, s.collectionFactory, false)
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)

@@ -464,7 +464,7 @@ func (s *RemoteRepoSuite) TestDownloadWithSources(c *C) {
 	s.downloader.ExpectError("http://mirror.yandex.ru/debian/dists/squeeze/main/source/Sources.gz", &http.Error{Code: 404})
 	s.downloader.ExpectResponse("http://mirror.yandex.ru/debian/dists/squeeze/main/source/Sources", exampleSourcesFile)

-	err = s.repo.DownloadPackageIndexes(s.progress, s.downloader, nil, s.collectionFactory, false, 1)
+	err = s.repo.DownloadPackageIndexes(s.progress, s.downloader, nil, s.collectionFactory, false)
 	c.Assert(err, IsNil)
 	c.Assert(s.downloader.Empty(), Equals, true)

@@ -488,7 +488,7 @@ func (s *RemoteRepoSuite) TestDownloadFlat(c *C) {
 	err := s.flat.Fetch(downloader, nil)
 	c.Assert(err, IsNil)

-	err = s.flat.DownloadPackageIndexes(s.progress, downloader, nil, s.collectionFactory, true, 1)
+	err = s.flat.DownloadPackageIndexes(s.progress, downloader, nil, s.collectionFactory, true)
 	c.Assert(err, IsNil)
 	c.Assert(downloader.Empty(), Equals, true)

@@ -516,7 +516,7 @@ func (s *RemoteRepoSuite) TestDownloadFlat(c *C) {
 	err = s.flat.Fetch(downloader, nil)
 	c.Assert(err, IsNil)

-	err = s.flat.DownloadPackageIndexes(s.progress, downloader, nil, s.collectionFactory, true, 1)
+	err = s.flat.DownloadPackageIndexes(s.progress, downloader, nil, s.collectionFactory, true)
 	c.Assert(err, IsNil)
 	c.Assert(downloader.Empty(), Equals, true)

@@ -538,7 +538,7 @@ func (s *RemoteRepoSuite) TestDownloadFlat(c *C) {
 	err = s.flat.Fetch(downloader, nil)
 	c.Assert(err, IsNil)

-	err = s.flat.DownloadPackageIndexes(s.progress, downloader, nil, s.collectionFactory, true, 1)
+	err = s.flat.DownloadPackageIndexes(s.progress, downloader, nil, s.collectionFactory, true)
 	c.Assert(err, IsNil)
 	c.Assert(downloader.Empty(), Equals, true)

@@ -569,7 +569,7 @@ func (s *RemoteRepoSuite) TestDownloadWithSourcesFlat(c *C) {
 	err := s.flat.Fetch(downloader, nil)
 	c.Assert(err, IsNil)

-	err = s.flat.DownloadPackageIndexes(s.progress, downloader, nil, s.collectionFactory, true, 1)
+	err = s.flat.DownloadPackageIndexes(s.progress, downloader, nil, s.collectionFactory, true)
 	c.Assert(err, IsNil)
 	c.Assert(downloader.Empty(), Equals, true)

@@ -615,7 +615,7 @@ func (s *RemoteRepoSuite) TestDownloadWithSourcesFlat(c *C) {
 	err = s.flat.Fetch(downloader, nil)
 	c.Assert(err, IsNil)

-	err = s.flat.DownloadPackageIndexes(s.progress, downloader, nil, s.collectionFactory, true, 1)
+	err = s.flat.DownloadPackageIndexes(s.progress, downloader, nil, s.collectionFactory, true)
 	c.Assert(err, IsNil)
 	c.Assert(downloader.Empty(), Equals, true)

@@ -641,7 +641,7 @@ func (s *RemoteRepoSuite) TestDownloadWithSourcesFlat(c *C) {
 	err = s.flat.Fetch(downloader, nil)
 	c.Assert(err, IsNil)

-	err = s.flat.DownloadPackageIndexes(s.progress, downloader, nil, s.collectionFactory, true, 1)
+	err = s.flat.DownloadPackageIndexes(s.progress, downloader, nil, s.collectionFactory, true)
 	c.Assert(err, IsNil)
 	c.Assert(downloader.Empty(), Equals, true)

--- a/http/compression.go
+++ b/http/compression.go
@@ -39,7 +39,7 @@ var compressionMethods = []struct {

 // DownloadTryCompression tries to download from URL .bz2, .gz and raw extension until
 // it finds existing file.
-func DownloadTryCompression(ctx context.Context, downloader aptly.Downloader, baseURL *url.URL, path string, expectedChecksums map[string]utils.ChecksumInfo, ignoreMismatch bool, maxTries int) (io.Reader, *os.File, error) {
+func DownloadTryCompression(ctx context.Context, downloader aptly.Downloader, baseURL *url.URL, path string, expectedChecksums map[string]utils.ChecksumInfo, ignoreMismatch bool) (io.Reader, *os.File, error) {
 	var err error

 	for _, method := range compressionMethods {
@@ -63,7 +63,7 @@ func DownloadTryCompression(ctx context.Context, downloader aptly.Downloader, ba

 		if foundChecksum {
 			expected := expectedChecksums[bestSuffix]
-			file, err = DownloadTempWithChecksum(ctx, downloader, tryURL.String(), &expected, ignoreMismatch, maxTries)
+			file, err = DownloadTempWithChecksum(ctx, downloader, tryURL.String(), &expected, ignoreMismatch)
 		} else {
 			if !ignoreMismatch {
 				continue
--- a/http/compression_test.go
+++ b/http/compression_test.go
@@ -44,7 +44,7 @@ func (s *CompressionSuite) TestDownloadTryCompression(c *C) {
 	buf = make([]byte, 4)
 	d := NewFakeDownloader()
 	d.ExpectResponse("http://example.com/file.bz2", bzipData)
-	r, file, err := DownloadTryCompression(s.ctx, d, s.baseURL, "file", expectedChecksums, false, 1)
+	r, file, err := DownloadTryCompression(s.ctx, d, s.baseURL, "file", expectedChecksums, false)
 	c.Assert(err, IsNil)
 	defer file.Close()
 	io.ReadFull(r, buf)
@@ -56,7 +56,7 @@ func (s *CompressionSuite) TestDownloadTryCompression(c *C) {
 	d = NewFakeDownloader()
 	d.ExpectError("http://example.com/file.bz2", &Error{Code: 404})
 	d.ExpectResponse("http://example.com/file.gz", gzipData)
-	r, file, err = DownloadTryCompression(s.ctx, d, s.baseURL, "file", expectedChecksums, false, 1)
+	r, file, err = DownloadTryCompression(s.ctx, d, s.baseURL, "file", expectedChecksums, false)
 	c.Assert(err, IsNil)
 	defer file.Close()
 	io.ReadFull(r, buf)
@@ -69,7 +69,7 @@ func (s *CompressionSuite) TestDownloadTryCompression(c *C) {
 	d.ExpectError("http://example.com/file.bz2", &Error{Code: 404})
 	d.ExpectError("http://example.com/file.gz", &Error{Code: 404})
 	d.ExpectResponse("http://example.com/file.xz", xzData)
-	r, file, err = DownloadTryCompression(s.ctx, d, s.baseURL, "file", expectedChecksums, false, 1)
+	r, file, err = DownloadTryCompression(s.ctx, d, s.baseURL, "file", expectedChecksums, false)
 	c.Assert(err, IsNil)
 	defer file.Close()
 	io.ReadFull(r, buf)
@@ -83,7 +83,7 @@ func (s *CompressionSuite) TestDownloadTryCompression(c *C) {
 	d.ExpectError("http://example.com/file.gz", &Error{Code: 404})
 	d.ExpectError("http://example.com/file.xz", &Error{Code: 404})
 	d.ExpectResponse("http://example.com/file", rawData)
-	r, file, err = DownloadTryCompression(s.ctx, d, s.baseURL, "file", expectedChecksums, false, 1)
+	r, file, err = DownloadTryCompression(s.ctx, d, s.baseURL, "file", expectedChecksums, false)
 	c.Assert(err, IsNil)
 	defer file.Close()
 	io.ReadFull(r, buf)
@@ -94,7 +94,7 @@ func (s *CompressionSuite) TestDownloadTryCompression(c *C) {
 	d = NewFakeDownloader()
 	d.ExpectError("http://example.com/file.bz2", &Error{Code: 404})
 	d.ExpectResponse("http://example.com/file.gz", "x")
-	_, _, err = DownloadTryCompression(s.ctx, d, s.baseURL, "file", nil, true, 1)
+	_, _, err = DownloadTryCompression(s.ctx, d, s.baseURL, "file", nil, true)
 	c.Assert(err, ErrorMatches, "unexpected EOF")
 	c.Assert(d.Empty(), Equals, true)
 }
@@ -112,7 +112,7 @@ func (s *CompressionSuite) TestDownloadTryCompressionLongestSuffix(c *C) {
 	buf = make([]byte, 4)
 	d := NewFakeDownloader()
 	d.ExpectResponse("http://example.com/subdir/file.bz2", bzipData)
-	r, file, err := DownloadTryCompression(s.ctx, d, s.baseURL, "subdir/file", expectedChecksums, false, 1)
+	r, file, err := DownloadTryCompression(s.ctx, d, s.baseURL, "subdir/file", expectedChecksums, false)
 	c.Assert(err, IsNil)
 	defer file.Close()
 	io.ReadFull(r, buf)
@@ -122,7 +122,7 @@ func (s *CompressionSuite) TestDownloadTryCompressionLongestSuffix(c *C) {

 func (s *CompressionSuite) TestDownloadTryCompressionErrors(c *C) {
 	d := NewFakeDownloader()
-	_, _, err := DownloadTryCompression(s.ctx, d, s.baseURL, "file", nil, true, 1)
+	_, _, err := DownloadTryCompression(s.ctx, d, s.baseURL, "file", nil, true)
 	c.Assert(err, ErrorMatches, "unexpected request.*")

 	d = NewFakeDownloader()
@@ -130,7 +130,7 @@ func (s *CompressionSuite) TestDownloadTryCompressionErrors(c *C) {
 	d.ExpectError("http://example.com/file.gz", &Error{Code: 404})
 	d.ExpectError("http://example.com/file.xz", &Error{Code: 404})
 	d.ExpectError("http://example.com/file", errors.New("403"))
-	_, _, err = DownloadTryCompression(s.ctx, d, s.baseURL, "file", nil, true, 1)
+	_, _, err = DownloadTryCompression(s.ctx, d, s.baseURL, "file", nil, true)
 	c.Assert(err, ErrorMatches, "403")

 	d = NewFakeDownloader()
@@ -144,6 +144,6 @@ func (s *CompressionSuite) TestDownloadTryCompressionErrors(c *C) {
 		"file.xz":  {Size: 7},
 		"file":     {Size: 7},
 	}
-	_, _, err = DownloadTryCompression(s.ctx, d, s.baseURL, "file", expectedChecksums, false, 1)
+	_, _, err = DownloadTryCompression(s.ctx, d, s.baseURL, "file", expectedChecksums, false)
 	c.Assert(err, ErrorMatches, "checksums don't match.*")
 }
--- a/http/download.go
+++ b/http/download.go
@@ -6,6 +6,7 @@ import (
 	"io"
 	"net"
 	"net/http"
+	"net/url"
 	"os"
 	"path/filepath"
 	"strings"
@@ -28,12 +29,13 @@ var (
 type downloaderImpl struct {
 	progress  aptly.Progress
 	aggWriter io.Writer
+	maxTries  int
 	client    *http.Client
 }

 // NewDownloader creates new instance of Downloader which specified number
 // of threads and download limit in bytes/sec
-func NewDownloader(downLimit int64, progress aptly.Progress) aptly.Downloader {
+func NewDownloader(downLimit int64, maxTries int, progress aptly.Progress) aptly.Downloader {
 	transport := http.Transport{}
 	transport.Proxy = http.DefaultTransport.(*http.Transport).Proxy
 	transport.ResponseHeaderTimeout = 30 * time.Second
@@ -45,6 +47,7 @@ func NewDownloader(downLimit int64, progress aptly.Progress) aptly.Downloader {

 	downloader := &downloaderImpl{
 		progress: progress,
+		maxTries: maxTries,
 		client: &http.Client{
 			Transport: &transport,
 		},
@@ -71,7 +74,19 @@ func (downloader *downloaderImpl) GetLength(ctx context.Context, url string) (in
 		return -1, err
 	}

-	resp, err := downloader.client.Do(req)
+	var resp *http.Response
+
+	maxTries := downloader.maxTries
+	for maxTries > 0 {
+		resp, err = downloader.client.Do(req)
+		if err != nil && retryableError(err) {
+			maxTries--
+		} else {
+			// stop retrying
+			break
+		}
+	}
+
 	if err != nil {
 		return -1, errors.Wrap(err, url)
 	}
@@ -89,10 +104,25 @@ func (downloader *downloaderImpl) GetLength(ctx context.Context, url string) (in

 // Download starts new download task
 func (downloader *downloaderImpl) Download(ctx context.Context, url string, destination string) error {
-	return downloader.DownloadWithChecksum(ctx, url, destination, nil, false, 1)
+	return downloader.DownloadWithChecksum(ctx, url, destination, nil, false)
 }

 func retryableError(err error) bool {
+	// unwrap errors.Wrap
+	err = errors.Cause(err)
+
+	// unwrap *url.Error
+	if wrapped, ok := err.(*url.Error); ok {
+		err = wrapped.Err
+	}
+
+	switch err {
+	case io.EOF:
+		return true
+	case io.ErrUnexpectedEOF:
+		return true
+	}
+
 	switch err.(type) {
 	case *net.OpError:
 		return true
@@ -101,6 +131,7 @@ func retryableError(err error) bool {
 	case net.Error:
 		return true
 	}
+
 	return false
 }

@@ -123,7 +154,7 @@ func (downloader *downloaderImpl) newRequest(ctx context.Context, method, url st

 // DownloadWithChecksum starts new download task with checksum verification
 func (downloader *downloaderImpl) DownloadWithChecksum(ctx context.Context, url string, destination string,
-	expected *utils.ChecksumInfo, ignoreMismatch bool, maxTries int) error {
+	expected *utils.ChecksumInfo, ignoreMismatch bool) error {

 	if downloader.progress != nil {
 		downloader.progress.Printf("Downloading %s...\n", url)
@@ -131,6 +162,7 @@ func (downloader *downloaderImpl) DownloadWithChecksum(ctx context.Context, url
 	req, err := downloader.newRequest(ctx, "GET", url)

 	var temppath string
+	maxTries := downloader.maxTries
 	for maxTries > 0 {
 		temppath, err = downloader.download(req, url, destination, expected, ignoreMismatch)

--- a/http/download_test.go
+++ b/http/download_test.go
@@ -45,7 +45,7 @@ func (s *DownloaderSuiteBase) SetUpTest(c *C) {
 	s.progress = console.NewProgress()
 	s.progress.Start()

-	s.d = NewDownloader(0, s.progress)
+	s.d = NewDownloader(0, 1, s.progress)
 	s.ctx = context.Background()
 }

@@ -78,32 +78,32 @@ func (s *DownloaderSuite) TestDownloadOK(c *C) {
 }

 func (s *DownloaderSuite) TestDownloadWithChecksum(c *C) {
-	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &utils.ChecksumInfo{}, false, 1),
+	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &utils.ChecksumInfo{}, false),
 		ErrorMatches, ".*size check mismatch 12 != 0")

-	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &utils.ChecksumInfo{Size: 12, MD5: "abcdef"}, false, 1),
+	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &utils.ChecksumInfo{Size: 12, MD5: "abcdef"}, false),
 		ErrorMatches, ".*md5 hash mismatch \"a1acb0fe91c7db45ec4d775192ec5738\" != \"abcdef\"")

-	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &utils.ChecksumInfo{Size: 12, MD5: "abcdef"}, true, 1),
+	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &utils.ChecksumInfo{Size: 12, MD5: "abcdef"}, true),
 		IsNil)

-	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &utils.ChecksumInfo{Size: 12, MD5: "a1acb0fe91c7db45ec4d775192ec5738"}, false, 1),
+	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &utils.ChecksumInfo{Size: 12, MD5: "a1acb0fe91c7db45ec4d775192ec5738"}, false),
 		IsNil)

-	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &utils.ChecksumInfo{Size: 12, MD5: "a1acb0fe91c7db45ec4d775192ec5738", SHA1: "abcdef"}, false, 1),
+	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &utils.ChecksumInfo{Size: 12, MD5: "a1acb0fe91c7db45ec4d775192ec5738", SHA1: "abcdef"}, false),
 		ErrorMatches, ".*sha1 hash mismatch \"921893bae6ad6fd818401875d6779254ef0ff0ec\" != \"abcdef\"")

 	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &utils.ChecksumInfo{Size: 12, MD5: "a1acb0fe91c7db45ec4d775192ec5738",
-		SHA1: "921893bae6ad6fd818401875d6779254ef0ff0ec"}, false, 1),
+		SHA1: "921893bae6ad6fd818401875d6779254ef0ff0ec"}, false),
 		IsNil)

 	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &utils.ChecksumInfo{Size: 12, MD5: "a1acb0fe91c7db45ec4d775192ec5738",
-		SHA1: "921893bae6ad6fd818401875d6779254ef0ff0ec", SHA256: "abcdef"}, false, 1),
+		SHA1: "921893bae6ad6fd818401875d6779254ef0ff0ec", SHA256: "abcdef"}, false),
 		ErrorMatches, ".*sha256 hash mismatch \"b3c92ee1246176ed35f6e8463cd49074f29442f5bbffc3f8591cde1dcc849dac\" != \"abcdef\"")

 	checksums := utils.ChecksumInfo{Size: 12, MD5: "a1acb0fe91c7db45ec4d775192ec5738",
 		SHA1: "921893bae6ad6fd818401875d6779254ef0ff0ec", SHA256: "b3c92ee1246176ed35f6e8463cd49074f29442f5bbffc3f8591cde1dcc849dac"}
-	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &checksums, false, 1),
+	c.Assert(s.d.DownloadWithChecksum(s.ctx, s.url+"/test", s.tempfile.Name(), &checksums, false),
 		IsNil)
 	// download backfills missing checksums
 	c.Check(checksums.SHA512, Equals, "bac18bf4e564856369acc2ed57300fecba3a2c1af5ae8304021e4252488678feb18118466382ee4e1210fe1f065080210e453a80cfb37ccb8752af3269df160e")
--- a/http/fake.go
+++ b/http/fake.go
@@ -89,7 +89,7 @@ func (f *FakeDownloader) getExpectedRequest(url string) (*expectedRequest, error
 }

 // DownloadWithChecksum performs fake download by matching against first expectation in the queue or any expectation, with cheksum verification
-func (f *FakeDownloader) DownloadWithChecksum(ctx context.Context, url string, filename string, expected *utils.ChecksumInfo, ignoreMismatch bool, maxTries int) error {
+func (f *FakeDownloader) DownloadWithChecksum(ctx context.Context, url string, filename string, expected *utils.ChecksumInfo, ignoreMismatch bool) error {
 	expectation, err := f.getExpectedRequest(url)
 	if err != nil {
 		return err
@@ -130,7 +130,7 @@ func (f *FakeDownloader) DownloadWithChecksum(ctx context.Context, url string, f

 // Download performs fake download by matching against first expectation in the queue
 func (f *FakeDownloader) Download(ctx context.Context, url string, filename string) error {
-	return f.DownloadWithChecksum(ctx, url, filename, nil, false, 1)
+	return f.DownloadWithChecksum(ctx, url, filename, nil, false)
 }

 // GetProgress returns Progress object
--- a/http/temp.go
+++ b/http/temp.go
@@ -14,13 +14,13 @@ import (
 //
 // Temporary file would be already removed, so no need to cleanup
 func DownloadTemp(ctx context.Context, downloader aptly.Downloader, url string) (*os.File, error) {
-	return DownloadTempWithChecksum(ctx, downloader, url, nil, false, 1)
+	return DownloadTempWithChecksum(ctx, downloader, url, nil, false)
 }

 // DownloadTempWithChecksum is a DownloadTemp with checksum verification
 //
 // Temporary file would be already removed, so no need to cleanup
-func DownloadTempWithChecksum(ctx context.Context, downloader aptly.Downloader, url string, expected *utils.ChecksumInfo, ignoreMismatch bool, maxTries int) (*os.File, error) {
+func DownloadTempWithChecksum(ctx context.Context, downloader aptly.Downloader, url string, expected *utils.ChecksumInfo, ignoreMismatch bool) (*os.File, error) {
 	tempdir, err := ioutil.TempDir(os.TempDir(), "aptly")
 	if err != nil {
 		return nil, err
@@ -34,7 +34,7 @@ func DownloadTempWithChecksum(ctx context.Context, downloader aptly.Downloader,
 		defer downloader.GetProgress().ShutdownBar()
 	}

-	err = downloader.DownloadWithChecksum(ctx, url, tempfile, expected, ignoreMismatch, maxTries)
+	err = downloader.DownloadWithChecksum(ctx, url, tempfile, expected, ignoreMismatch)
 	if err != nil {
 		return nil, err
 	}
--- a/http/temp_test.go
+++ b/http/temp_test.go
@@ -38,12 +38,12 @@ func (s *TempSuite) TestDownloadTemp(c *C) {

 func (s *TempSuite) TestDownloadTempWithChecksum(c *C) {
 	f, err := DownloadTempWithChecksum(s.ctx, s.d, s.url+"/test", &utils.ChecksumInfo{Size: 12, MD5: "a1acb0fe91c7db45ec4d775192ec5738",
-		SHA1: "921893bae6ad6fd818401875d6779254ef0ff0ec", SHA256: "b3c92ee1246176ed35f6e8463cd49074f29442f5bbffc3f8591cde1dcc849dac"}, false, 1)
+		SHA1: "921893bae6ad6fd818401875d6779254ef0ff0ec", SHA256: "b3c92ee1246176ed35f6e8463cd49074f29442f5bbffc3f8591cde1dcc849dac"}, false)
 	c.Assert(err, IsNil)

 	c.Assert(f.Close(), IsNil)

-	_, err = DownloadTempWithChecksum(s.ctx, s.d, s.url+"/test", &utils.ChecksumInfo{Size: 13}, false, 1)
+	_, err = DownloadTempWithChecksum(s.ctx, s.d, s.url+"/test", &utils.ChecksumInfo{Size: 13}, false)
 	c.Assert(err, ErrorMatches, ".*size check mismatch 12 != 13")
 }

--- a/man/Makefile
+++ b/man/Makefile
@@ -1,10 +1,12 @@
-all: prepare generate
+RUBYBINPATH=$(shell ruby -r rubygems -e 'puts Gem.user_dir')/bin

-prepare:
-	gem install specific_install
-	gem specific_install -l smira/ronn
+all: $(RUBYBINPATH)/ronn generate
+
+$(RUBYBINPATH)/ronn:
+	gem install --user-install specific_install
+	gem specific_install --user-install -l smira/ronn

 generate:
-	go run ../_man/gen.go
+	PATH=$(RUBYBINPATH):$(PATH) go run ../_man/gen.go

-.PHONY: prepare generate
+.PHONY: generate
--- a/man/aptly.1
+++ b/man/aptly.1
@@ -1,7 +1,7 @@
 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "APTLY" "1" "September 2018" "" ""
+.TH "APTLY" "1" "August 2019" "" ""
 .
 .SH "NAME"
 \fBaptly\fR \- Debian repository management tool
@@ -38,6 +38,7 @@ Configuration file is stored in JSON format (default values shown below):
  "rootDir": "$HOME/\.aptly",
  "downloadConcurrency": 4,
  "downloadSpeedLimit": 0,
+  "downloadRetries": 0,
  "architectures": [],
  "dependencyFollowSuggests": false,
  "dependencyFollowRecommends": false,
@@ -114,7 +115,11 @@ is a number of parallel download threads to use when downloading packages
 .
 .TP
 \fBdownloadSpeedLimit\fR
-limit in kbytes/sec on download speed while mirroring remote repositieis
+limit in kbytes/sec on download speed while mirroring remote repositories
+.
+.TP
+\fBdownloadRetries\fR
+number of retries for download attempts
 .
 .TP
 \fBarchitectures\fR
@@ -2050,5 +2055,11 @@ Strajan Sebastian (https://github\.com/strajansebastian)
 .IP "\[ci]" 4
 Artem Smirnov (https://github\.com/urpylka)
 .
+.IP "\[ci]" 4
+William Manley (https://github\.com/wmanley)
+.
+.IP "\[ci]" 4
+Shengjing Zhu (https://github\.com/zhsj)
+.
 .IP "" 0

--- a/man/aptly.1.ronn.tmpl
+++ b/man/aptly.1.ronn.tmpl
@@ -30,6 +30,7 @@ Configuration file is stored in JSON format (default values shown below):
      "rootDir": "$HOME/.aptly",
      "downloadConcurrency": 4,
      "downloadSpeedLimit": 0,
+      "downloadRetries": 0,
      "architectures": [],
      "dependencyFollowSuggests": false,
      "dependencyFollowRecommends": false,
@@ -99,7 +100,10 @@ Options:
    is a number of parallel download threads to use when downloading packages

  * `downloadSpeedLimit`:
-    limit in kbytes/sec on download speed while mirroring remote repositieis
+    limit in kbytes/sec on download speed while mirroring remote repositories
+
+  * `downloadRetries`:
+    number of retries for download attempts

  * `architectures`:
    is a list of architectures to process; if left empty defaults to all available architectures; could be
--- a/system/lib.py
+++ b/system/lib.py
@@ -98,6 +98,7 @@ class BaseTest(object):
        "rootDir": "%s/.aptly" % os.environ["HOME"],
        "downloadConcurrency": 4,
        "downloadSpeedLimit": 0,
+        "downloadRetries": 5,
        "architectures": [],
        "dependencyFollowSuggests": False,
        "dependencyFollowRecommends": False,
--- a/system/t02_config/ConfigShowTest_gold
+++ b/system/t02_config/ConfigShowTest_gold
@@ -2,6 +2,7 @@
    "rootDir": "${HOME}/.aptly",
    "downloadConcurrency": 4,
    "downloadSpeedLimit": 0,
+    "downloadRetries": 5,
    "architectures": [],
    "dependencyFollowSuggests": false,
    "dependencyFollowRecommends": false,
--- a/system/t02_config/CreateConfigTest_gold
+++ b/system/t02_config/CreateConfigTest_gold
@@ -2,6 +2,7 @@
  "rootDir": "${HOME}/.aptly",
  "downloadConcurrency": 4,
  "downloadSpeedLimit": 0,
+  "downloadRetries": 0,
  "architectures": [],
  "dependencyFollowSuggests": false,
  "dependencyFollowRecommends": false,
--- a/system/t04_mirror/UpdateMirror19Test_gold
+++ b/system/t04_mirror/UpdateMirror19Test_gold
@@ -6,6 +6,6 @@ gpgv: Good signature from "Package Maintainer (PagerDuty, Inc.) <packages@pagerd
 Downloading & parsing package files...
 Downloading http://packages.pagerduty.com/pdagent/deb/Packages.gz...
 Building download queue...
-Download queue: 15 items (1.87 MiB)
+Download queue: 16 items (2.08 MiB)

 Mirror `pagerduty` has been successfully updated.
--- a/system/t04_mirror/UpdateMirror21Test_gold
+++ b/system/t04_mirror/UpdateMirror21Test_gold
@@ -6,6 +6,6 @@ openpgp: Good signature from "Package Maintainer (PagerDuty, Inc.) <packages@pag
 Downloading & parsing package files...
 Downloading http://packages.pagerduty.com/pdagent/deb/Packages.gz...
 Building download queue...
-Download queue: 15 items (1.87 MiB)
+Download queue: 16 items (2.08 MiB)

 Mirror `pagerduty` has been successfully updated.
--- a/utils/config.go
+++ b/utils/config.go
@@ -11,6 +11,7 @@ type ConfigStructure struct { // nolint: maligned
 	RootDir                string                           `json:"rootDir"`
 	DownloadConcurrency    int                              `json:"downloadConcurrency"`
 	DownloadLimit          int64                            `json:"downloadSpeedLimit"`
+	DownloadRetries        int                              `json:"downloadRetries"`
 	Architectures          []string                         `json:"architectures"`
 	DepFollowSuggests      bool                             `json:"dependencyFollowSuggests"`
 	DepFollowRecommends    bool                             `json:"dependencyFollowRecommends"`
--- a/utils/config_test.go
+++ b/utils/config_test.go
@@ -57,6 +57,7 @@ func (s *ConfigSuite) TestSaveConfig(c *C) {
 		"  \"rootDir\": \"/tmp/aptly\",\n"+
 		"  \"downloadConcurrency\": 5,\n"+
 		"  \"downloadSpeedLimit\": 0,\n"+
+		"  \"downloadRetries\": 0,\n"+
 		"  \"architectures\": null,\n"+
 		"  \"dependencyFollowSuggests\": false,\n"+
 		"  \"dependencyFollowRecommends\": false,\n"+