Add unarchiving to file downloader

go.mod

@@ -19,6 +19,7 @@ require (
 	github.com/schollz/progressbar/v3 v3.13.0
 	github.com/twitchtv/twirp v8.1.3+incompatible
 	github.com/urfave/cli/v2 v2.23.7
+	github.com/vmihailenco/msgpack/v5 v5.3.5
 	go.arsenm.dev/logger v0.0.0-20230126004036-a8cbbe3b6fe6
 	go.arsenm.dev/translate v0.0.0-20230113025904-5ad1ec0ed296
 	golang.org/x/exp v0.0.0-20220916125017-b168a2c6b86b
@@ -86,6 +87,7 @@ require (
 	github.com/sirupsen/logrus v1.9.0 // indirect
 	github.com/therootcompany/xz v1.0.1 // indirect
 	github.com/ulikunitz/xz v0.5.10 // indirect
+	github.com/vmihailenco/tagparser/v2 v2.0.0 // indirect
 	github.com/xanzy/ssh-agent v0.3.1 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect

go.sum

@@ -251,6 +251,10 @@ github.com/ulikunitz/xz v0.5.10 h1:t92gobL9l3HE202wg3rlk19F6X+JOxl9BBrCCMYEYd8=
 github.com/ulikunitz/xz v0.5.10/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
 github.com/urfave/cli/v2 v2.23.7 h1:YHDQ46s3VghFHFf1DdF+Sh7H4RqhcM+t0TmZRJx4oJY=
 github.com/urfave/cli/v2 v2.23.7/go.mod h1:GHupkWPMM0M/sj1a2b4wUrWBPzazNrIjouW6fmdJLxc=
+github.com/vmihailenco/msgpack/v5 v5.3.5 h1:5gO0H1iULLWGhs2H5tbAHIZTV8/cYafcFOr9znI5mJU=
+github.com/vmihailenco/msgpack/v5 v5.3.5/go.mod h1:7xyJ9e+0+9SaZT0Wt1RGleJXzli6Q/V5KbhBonMG9jc=
+github.com/vmihailenco/tagparser/v2 v2.0.0 h1:y09buUbR+b5aycVFQs/g70pqKVZNBmxwAhO7/IwNM9g=
+github.com/vmihailenco/tagparser/v2 v2.0.0/go.mod h1:Wri+At7QHww0WTrCBeu4J6bNtoV6mEfg5OIWRZA9qds=
 github.com/xanzy/ssh-agent v0.3.0/go.mod h1:3s9xbODqPuuhK9JV1R321M/FlMZSBvE5aY6eAcqrDh0=
 github.com/xanzy/ssh-agent v0.3.1 h1:AmzO1SSWxw73zxFZPRwaMN1MohDw8UyHnmuxyceTEGo=
 github.com/xanzy/ssh-agent v0.3.1/go.mod h1:QIE4lCeL7nkC25x+yA3LBIYfwCc1TFziCtG7cBAac6w=

internal/dl/dl.go

@@ -2,15 +2,22 @@ package dl
 
 import (
 	"context"
+	"errors"
 	"io"
 	"os"
 	"path/filepath"
 
+	"github.com/vmihailenco/msgpack/v5"
 	"go.arsenm.dev/logger/log"
 	"go.arsenm.dev/lure/internal/dlcache"
 )
 
+const manifestFileName = ".lure_cache_manifest"
+
+var ErrChecksumMismatch = errors.New("dl: checksums did not match")
+
 var Downloaders = []Downloader{
+	GitDownloader{},
 	FileDownloader{},
 }
 
@@ -32,48 +39,85 @@ func (t Type) String() string {
 }
 
 type Options struct {
-	ID          string
-	Name        string
-	URL         string
-	Destination string
-	Progress    io.Writer
+	SHA256           []byte
+	Name             string
+	URL              string
+	Destination      string
+	CacheDisabled    bool
+	PostprocDisabled bool
+	Progress         io.Writer
+}
+
+type Manifest struct {
+	Type Type
+	Name string
 }
 
 type Downloader interface {
 	Name() string
-	Type() Type
 	MatchURL(string) bool
-	Download(Options) error
+	Download(Options) (Type, string, error)
 }
 
 type UpdatingDownloader interface {
 	Downloader
-	Update(Options) error
+	Update(Options) (bool, error)
 }
 
-func Download(ctx context.Context, opts Options) error {
+func Download(ctx context.Context, opts Options) (err error) {
 	d := getDownloader(opts.URL)
-	cacheDir, ok := dlcache.Get(opts.ID)
+
+	if opts.CacheDisabled {
+		_, _, err = d.Download(opts)
+		return err
+	}
+
+	var t Type
+	cacheDir, ok := dlcache.Get(opts.URL)
 	if ok {
-		ok, err := handleCache(cacheDir, opts.Destination, d.Type())
+		var updated bool
+		if d, ok := d.(UpdatingDownloader); ok {
+			log.Info("Source can be updated, updating if required").Str("source", opts.Name).Str("downloader", d.Name()).Send()
+
+			updated, err = d.Update(Options{
+				Name:        opts.Name,
+				URL:         opts.URL,
+				Destination: cacheDir,
+				Progress:    opts.Progress,
+			})
+			if err != nil {
+				return err
+			}
+		}
+
+		m, err := getManifest(cacheDir)
+		if err != nil {
+			return err
+		}
+		t = m.Type
+
+		dest := filepath.Join(opts.Destination, m.Name)
+		ok, err := handleCache(cacheDir, dest, t)
 		if err != nil {
 			return err
 		}
 
-		if ok {
-			log.Info("Source found in cache, linked to destination").Str("source", opts.Name).Stringer("type", d.Type()).Send()
+		if ok && !updated {
+			log.Info("Source found in cache, linked to destination").Str("source", opts.Name).Stringer("type", t).Send()
+			return nil
+		} else if ok {
 			return nil
 		}
 	}
 
 	log.Info("Downloading source").Str("source", opts.Name).Str("downloader", d.Name()).Send()
 
-	cacheDir, err := dlcache.New(opts.ID)
+	cacheDir, err = dlcache.New(opts.URL)
 	if err != nil {
 		return err
 	}
 
-	err = d.Download(Options{
+	t, name, err := d.Download(Options{
 		Name:        opts.Name,
 		URL:         opts.URL,
 		Destination: cacheDir,
@@ -83,10 +127,36 @@ func Download(ctx context.Context, opts Options) error {
 		return err
 	}
 
-	_, err = handleCache(cacheDir, opts.Destination, d.Type())
+	err = writeManifest(cacheDir, Manifest{t, name})
+	if err != nil {
+		return err
+	}
+
+	dest := filepath.Join(opts.Destination, name)
+	_, err = handleCache(cacheDir, dest, t)
 	return err
 }
 
+func writeManifest(cacheDir string, m Manifest) error {
+	fl, err := os.Create(filepath.Join(cacheDir, manifestFileName))
+	if err != nil {
+		return err
+	}
+	defer fl.Close()
+	return msgpack.NewEncoder(fl).Encode(m)
+}
+
+func getManifest(cacheDir string) (m Manifest, err error) {
+	fl, err := os.Open(filepath.Join(cacheDir, manifestFileName))
+	if err != nil {
+		return Manifest{}, err
+	}
+	defer fl.Close()
+
+	err = msgpack.NewDecoder(fl).Decode(&m)
+	return
+}
+
 func handleCache(cacheDir, dest string, t Type) (bool, error) {
 	switch t {
 	case TypeFile:
@@ -95,24 +165,28 @@ func handleCache(cacheDir, dest string, t Type) (bool, error) {
 			return false, err
 		}
 
-		names, err := cd.Readdirnames(1)
-		if err != nil && err != io.EOF {
-			return false, err
-		}
-
-		// If the cache dir contains no files,
-		// assume there is no cache entry
-		if len(names) == 0 {
+		names, err := cd.Readdirnames(2)
+		if err == io.EOF {
 			break
+		} else if err != nil {
+			return false, err
 		}
 
-		err = os.Link(filepath.Join(cacheDir, names[0]), filepath.Join(dest, filepath.Base(names[0])))
-		if err != nil {
-			return false, err
+		cd.Close()
+
+		for _, name := range names {
+			if name == manifestFileName {
+				continue
+			}
+
+			err = os.Link(filepath.Join(cacheDir, names[0]), filepath.Join(dest, filepath.Base(names[0])))
+			if err != nil {
+				return false, err
+			}
 		}
 		return true, nil
 	case TypeDir:
-		err := os.Link(cacheDir, dest)
+		err := linkDir(cacheDir, dest)
 		if err != nil {
 			return false, err
 		}
@@ -121,6 +195,30 @@ func handleCache(cacheDir, dest string, t Type) (bool, error) {
 	return false, nil
 }
 
+func linkDir(src, dest string) error {
+	return filepath.Walk(src, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if info.Name() == manifestFileName {
+			return nil
+		}
+
+		rel, err := filepath.Rel(src, path)
+		if err != nil {
+			return err
+		}
+
+		newPath := filepath.Join(dest, rel)
+		if info.IsDir() {
+			return os.Mkdir(newPath, info.Mode())
+		}
+
+		return os.Link(path, newPath)
+	})
+}
+
 func getDownloader(u string) Downloader {
 	for _, d := range Downloaders {
 		if d.MatchURL(u) {

internal/dl/file.go

@@ -1,14 +1,21 @@
 package dl
 
 import (
+	"bytes"
+	"context"
+	"crypto/sha256"
 	"io"
 	"net/http"
 	"os"
 	"path"
 	"path/filepath"
 	"regexp"
+	"strings"
+	"time"
 
+	"github.com/mholt/archiver/v4"
 	"github.com/schollz/progressbar/v3"
+	"go.arsenm.dev/lure/internal/shutils"
 )
 
 type FileDownloader struct{}
@@ -25,27 +32,155 @@ func (FileDownloader) MatchURL(string) bool {
 	return true
 }
 
-func (FileDownloader) Download(opts Options) error {
+func (FileDownloader) Download(opts Options) (Type, string, error) {
 	res, err := http.Get(opts.URL)
 	if err != nil {
-		return err
+		return 0, "", err
 	}
-	defer res.Body.Close()
 
 	name := getFilename(res)
-	fl, err := os.Create(filepath.Join(opts.Destination, name))
+	path := filepath.Join(opts.Destination, name)
+	fl, err := os.Create(path)
 	if err != nil {
-		return err
+		return 0, "", err
+	}
+	defer fl.Close()
+
+	var bar io.WriteCloser
+	if opts.Progress != nil {
+		bar = progressbar.NewOptions64(
+			res.ContentLength,
+			progressbar.OptionSetDescription(name),
+			progressbar.OptionSetWriter(opts.Progress),
+			progressbar.OptionShowBytes(true),
+			progressbar.OptionSetWidth(10),
+			progressbar.OptionThrottle(65*time.Millisecond),
+			progressbar.OptionShowCount(),
+			progressbar.OptionOnCompletion(func() {
+				_, _ = io.WriteString(opts.Progress, "\n")
+			}),
+			progressbar.OptionSpinnerType(14),
+			progressbar.OptionFullWidth(),
+			progressbar.OptionSetRenderBlankState(true),
+		)
+		defer bar.Close()
+	} else {
+		bar = shutils.NopRWC{}
 	}
 
-	bar := progressbar.DefaultBytes(
-		res.ContentLength,
-		"downloading "+name,
-	)
-	defer bar.Close()
+	h := sha256.New()
 
-	_, err = io.Copy(io.MultiWriter(fl, bar), res.Body)
-	return err
+	var w io.Writer
+	if opts.SHA256 != nil {
+		w = io.MultiWriter(fl, h, bar)
+	} else {
+		w = io.MultiWriter(fl, bar)
+	}
+
+	_, err = io.Copy(w, res.Body)
+	if err != nil {
+		return 0, "", err
+	}
+	res.Body.Close()
+
+	if opts.SHA256 != nil {
+		sum := h.Sum(nil)
+		if !bytes.Equal(sum, opts.SHA256) {
+			return 0, "", ErrChecksumMismatch
+		}
+	}
+
+	if opts.PostprocDisabled {
+		return TypeFile, name, nil
+	}
+
+	_, err = fl.Seek(0, io.SeekStart)
+	if err != nil {
+		return 0, "", err
+	}
+
+	format, r, err := archiver.Identify(name, fl)
+	if err == archiver.ErrNoMatch {
+		return TypeFile, name, nil
+	} else if err != nil {
+		return 0, "", err
+	}
+
+	err = extractFile(r, format, name, opts)
+	if err != nil {
+		return 0, "", err
+	}
+
+	err = os.Remove(path)
+	return TypeDir, strings.TrimSuffix(name, format.Name()), err
+}
+
+func extractFile(r io.Reader, format archiver.Format, name string, opts Options) (err error) {
+	fname := format.Name()
+
+	switch format := format.(type) {
+	case archiver.Extractor:
+		err = format.Extract(context.Background(), r, nil, func(ctx context.Context, f archiver.File) error {
+			fr, err := f.Open()
+			if err != nil {
+				return err
+			}
+			defer fr.Close()
+			fi, err := f.Stat()
+			if err != nil {
+				return err
+			}
+			fm := fi.Mode()
+
+			path := filepath.Join(opts.Destination, f.NameInArchive)
+
+			err = os.MkdirAll(filepath.Dir(path), 0o755)
+			if err != nil {
+				return err
+			}
+
+			if f.IsDir() {
+				err = os.Mkdir(path, 0o755)
+				if err != nil {
+					return err
+				}
+			} else {
+				outFl, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, fm.Perm())
+				if err != nil {
+					return err
+				}
+				defer outFl.Close()
+
+				_, err = io.Copy(outFl, fr)
+				return err
+			}
+			return nil
+		})
+		if err != nil {
+			return err
+		}
+	case archiver.Decompressor:
+		rc, err := format.OpenReader(r)
+		if err != nil {
+			return err
+		}
+		defer rc.Close()
+
+		path := filepath.Join(opts.Destination, name)
+		path = strings.TrimSuffix(path, fname)
+
+		outFl, err := os.Create(path)
+		if err != nil {
+			return err
+		}
+
+		_, err = io.Copy(outFl, rc)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
 }
 
 var cdHeaderRgx = regexp.MustCompile(`filename="(.+)"`)

internal/shutils/nop.go

@@ -47,7 +47,7 @@ func (NopRWC) Read([]byte) (int, error) {
 }
 
 func (NopRWC) Write([]byte) (int, error) {
-	return 0, io.EOF
+	return 0, nil
 }
 
 func (NopRWC) Close() error {