modularise backend a bit

backend.go

@@ -1,154 +1,78 @@
 package debanator
 
 import (
-	"crypto/md5"
-	"crypto/sha1"
-	"crypto/sha256"
-	"fmt"
 	"io"
 	"io/fs"
+	"net/http"
 	"os"
 	"path"
-	"strconv"
+	"path/filepath"
 	"strings"
 
 	log "github.com/sirupsen/logrus"
-	"pault.ag/go/debian/control"
-	"pault.ag/go/debian/deb"
-	"pault.ag/go/debian/dependency"
-	"pault.ag/go/debian/version"
-
-	"golang.org/x/exp/maps"
 )
 
 // A backend to search for packages in
 type Backend interface {
-	GetPackages() 
+	GetFiles() ([]DebFile, error)
+	ServeFiles(string) http.Handler
 }
 
+type ReaderAtCloser interface {
+	io.ReaderAt
+	io.ReadCloser
+}
+
+// An abstract interface for reading a debfile. This could be coming from the local fs,
+// a remote webdav share, etc...
+type DebFile interface {
+	GetReader() (ReaderAtCloser, error)
+	GetName() string
+}
 
 type FileBackend struct {
 	path string
 }
 
+// A deb file existing on the local filesystem
+type fsDebFile struct {
+	path string
+}
+
+func (f fsDebFile) GetReader() (ReaderAtCloser, error) {
+	return os.Open(f.path)
+}
+
+func (f fsDebFile) GetName() string {
+	_, name := filepath.Split(f.path)
+	return name
+}
 
 func NewFileBackend(path string) FileBackend {
 	return FileBackend{path}
 }
 
-func BinaryIndexFromDeb(p string, basePath string) (*control.BinaryIndex, error) {
+func (fb FileBackend) ServeFiles(prefix string) http.Handler {
-	f, err := os.Open(p)
+	return http.StripPrefix(path.Join(prefix, "pool"), http.FileServer(http.Dir(fb.path)))
-	if err != nil {
-		return nil, fmt.Errorf("open file: %w", err)
-	}
-	defer f.Close()
-	debFile, err := deb.Load(f, p)
-	if err != nil {
-		return nil, fmt.Errorf("read deb: %w", err)
-	}
-	md5sum := md5.New()
-	sha1sum := sha1.New()
-	sha256sum := sha256.New()
-	hashWriter := io.MultiWriter(md5sum, sha1sum, sha256sum)
-	size, err := io.Copy(hashWriter, f)
-	if err != nil {
-		return nil, fmt.Errorf("hash file: %w", err)
-	}
-	bi := control.BinaryIndex{
-		Paragraph: control.Paragraph{
-			Values: make(map[string]string),
-		},
-		Package: debFile.Control.Package,
-		Source: debFile.Control.Source,
-		Version: debFile.Control.Version,
-		InstalledSize: fmt.Sprintf("%d", debFile.Control.InstalledSize),
-		Size: strconv.Itoa(int(size)),
-		Maintainer: debFile.Control.Maintainer,
-		Architecture: debFile.Control.Architecture,
-		MultiArch: debFile.Control.MultiArch,
-		Description: debFile.Control.Description,
-		Homepage: debFile.Control.Homepage,
-		Section: debFile.Control.Section,
-		// FIXME: gross, make this more centrally managed somehow
-		Filename: path.Join("pool/main", strings.TrimPrefix(p, basePath)),
-		Priority: debFile.Control.Priority,
-		MD5sum: fmt.Sprintf("%x", md5sum.Sum(nil)),
-		SHA1: fmt.Sprintf("%x", sha1sum.Sum(nil)),
-		SHA256: fmt.Sprintf("%x", sha256sum.Sum(nil)),
-	}
-	if debFile.Control.Depends.String() != "" {
-		bi.Paragraph.Set("Depends", debFile.Control.Depends.String())
-	}
-	if debFile.Control.Recommends.String() != "" {
-		bi.Paragraph.Set("Recommends", debFile.Control.Recommends.String())
-	}
-	if debFile.Control.Suggests.String() != "" {
-		bi.Paragraph.Set("Suggests", debFile.Control.Suggests.String())
-	}
-	if debFile.Control.Breaks.String() != "" {
-		bi.Paragraph.Set("Breaks", debFile.Control.Breaks.String())
-	}
-	if debFile.Control.Replaces.String() != "" {
-		bi.Paragraph.Set("Replaces", debFile.Control.Replaces.String())
-	}
-	if debFile.Control.BuiltUsing.String() != "" {
-		bi.Paragraph.Set("BuiltUsing", debFile.Control.BuiltUsing.String())
-	}
-	return &bi, nil
 }
 
-func ScanDebs(debpath string) Repo {
+func (fb FileBackend) GetFiles() ([]DebFile, error) {
-	var debs []string
+	var debs []DebFile
-	fs.WalkDir(os.DirFS(debpath), ".", func(path string, dir fs.DirEntry, err error) error {
+	fs.WalkDir(os.DirFS(fb.path), ".", func(dirpath string, dir fs.DirEntry, err error) error {
 		if err != nil {
 			log.WithFields(log.Fields{
-				"path":  path,
+				"path":  dirpath,
 				"error": err,
 			}).Warn("Error scanning for debs")
 			return nil
 		}
-		if !dir.IsDir() && strings.HasSuffix(dir.Name(), ".deb"){
+		if !dir.IsDir() && strings.HasSuffix(dir.Name(), ".deb") {
-			debs = append(debs, path)
+			debs = append(debs, DebFile(fsDebFile{
+				filepath.Join(fb.path, dirpath),
+			}))
 		}
 		return nil
 	})
-	packs := make(map[string]LogicalPackage)
+	log.Infof("got files: %v", debs)
-	for _, d := range debs {
+	return debs, nil
-		p := path.Join(debpath, d)
-		bi, err  := BinaryIndexFromDeb(p, debpath)
-		if err != nil {
-			log.WithFields(log.Fields{
-				"path": p,
-				"error": err,
-			}).Error("Error processing deb file")
-			continue
-		}
-
-		packageName := bi.Package
-		if _, ok := packs[packageName]; !ok {
-			packs[packageName] = LogicalPackage{
-				Name: packageName,
-				Arches: make(map[dependency.Arch]map[version.Version]control.BinaryIndex),
-			}
-		}
-		pack := packs[packageName]
-		if _, ok := pack.Arches[bi.Architecture]; !ok {
-			pack.Arches[bi.Architecture] = make(map[version.Version]control.BinaryIndex)
-		}
-		arch := pack.Arches[bi.Architecture]
-		if _, ok := arch[bi.Version]; !ok {
-			arch[bi.Version] = *bi
-		} else {
-			log.WithFields(log.Fields{
-				"package": packageName,
-				"arch": arch,
-				"version": bi.Version.String(),
-			}).Warn("Duplicate package/arch/version found, ignoring...")
-		}
-	}
-
-	return Repo{
-		packages: maps.Values(packs),
-		cache: make(map[string]hashedFile),
-	}
 }

cmd/main.go

@@ -37,17 +37,6 @@ func logMiddleware(h http.HandlerFunc) http.HandlerFunc {
 	}
 }
 
-func md(err error) {
-	if err != nil {
-		log.Fatal(err)
-	}
-}
-
-func unwrap[T any](val T, err error) T {
-	md(err)
-	return val
-}
-
 func main() {
 	listenAddr := *flag.String("listen", ":1612", "HTTP listen address")
 	debPath := *flag.String("debpath", "debs", "Path to directory containing deb files.")
@@ -57,22 +46,23 @@ func main() {
 	kb, err := os.ReadFile("privkey.gpg")
 	if err != nil {
 		log.Infof("Generating new key...")
-		ecKey = unwrap(crypto.GenerateKey("Debanator", "packager@example.com", "x25519", 0))
+		ecKey = debanator.Unwrap(crypto.GenerateKey("Debanator", "packager@example.com", "x25519", 0))
-		f := unwrap(os.Create("privkey.gpg"))
+		f := debanator.Unwrap(os.Create("privkey.gpg"))
 		defer f.Close()
-		armored := unwrap(ecKey.Armor())
+		armored := debanator.Unwrap(ecKey.Armor())
 		f.WriteString(armored)
 	} else {
 		log.Infof("Using existing key...")
-		ecKey = unwrap(crypto.NewKeyFromArmored(string(kb)))
+		ecKey = debanator.Unwrap(crypto.NewKeyFromArmored(string(kb)))
 	}
 
 	signingKeyRing, err := crypto.NewKeyRing(ecKey)
 	if err != nil {
 		log.Fatal(err)
 	}
-
+	be := debanator.NewFileBackend(debPath)
-	repo := debanator.ScanDebs(debPath)
+	repo := debanator.NewRepoFromBackend(be, "/dists/stable")
+	debanator.Md(repo.Populate())
 	if err := repo.GenerateFiles(); err != nil {
 		log.Fatal(err)
 	}
@@ -94,6 +84,5 @@ func main() {
 		io.WriteString(w, pub)
 	})
 	r.Mount("/dists/stable", repo.GetHandler(signingKeyRing))
-	r.Get("/pool/main/*", http.StripPrefix("/pool/main/", http.FileServer(http.Dir(debPath))).ServeHTTP)
 	http.ListenAndServe(listenAddr, r)
 }

package.go

@@ -1,19 +1,17 @@
 package debanator
 
 import (
-	"bytes"
+	"crypto/md5"
+	"crypto/sha1"
+	"crypto/sha256"
 	"fmt"
 	"io"
-	"net/http"
+	"strconv"
-	"time"
+	"strings"
 
-	"github.com/ProtonMail/gopenpgp/v2/crypto"
-	"github.com/go-chi/chi/v5"
-	log "github.com/sirupsen/logrus"
-	"golang.org/x/exp/maps"
 	"pault.ag/go/debian/control"
+	"pault.ag/go/debian/deb"
 	"pault.ag/go/debian/dependency"
-	"pault.ag/go/debian/hashio"
 	"pault.ag/go/debian/version"
 )
 
@@ -24,137 +22,58 @@ type LogicalPackage struct {
 	Arches map[dependency.Arch]map[version.Version]control.BinaryIndex
 }
 
-type hashedFile struct {
+func BinaryIndexFromDeb(r ReaderAtCloser, filePath string) (*control.BinaryIndex, error) {
-	buf []byte
+	debFile, err := deb.Load(r, "fakepath")
-	md5Hash control.MD5FileHash
-	sha1Hash control.SHA1FileHash
-	sha256Hash control.SHA256FileHash
-}
-
-type Repo struct {
-	packages []LogicalPackage
-	cache map[string]hashedFile
-	release []byte
-}
-
-func (r *Repo) GetArches() []dependency.Arch {
-	arches := make(map[dependency.Arch]struct{})
-	for _, lp := range r.packages {
-		for arch := range lp.Arches {
-			arches[arch] = struct{}{}
-		}
-	}
-	return maps.Keys(arches)
-}
-
-// Find the latest versions of all packages for the given arch
-func (r *Repo) GetPackagesForArch(a dependency.Arch) []control.BinaryIndex {
-	out := []control.BinaryIndex{}
-	for _, p := range r.packages {
-		if versions, ok := p.Arches[a]; ok {
-			var latest version.Version
-			for v := range versions {
-				if version.Compare(v, latest) > 0 {
-					latest = v 
-				}
-			}
-			out = append(out, p.Arches[a][latest])
-		}
-	}
-	return out
-}
-
-func (r *Repo) makePackagesFileForArch(arch dependency.Arch) error {
-	var b bytes.Buffer
-	w, hashers, err := hashio.NewHasherWriters([]string{"md5", "sha256", "sha1"}, &b)
-	enc, _ := control.NewEncoder(w)
-	for _, d := range r.GetPackagesForArch(arch) {
-		if err = enc.Encode(d); err != nil {
-			return fmt.Errorf("encoding package %s: %w", d.Package, err)
-		}
-	}
-	fname := fmt.Sprintf("main/binary-%s/Packages", arch)
-	hashes := make(map[string]control.FileHash)
-	for _, h := range hashers {
-		hashes[h.Name()] = control.FileHashFromHasher(fname, *h)
-	}
-	r.cache[fname] = hashedFile{
-		buf: b.Bytes(),
-		sha256Hash: control.SHA256FileHash{hashes["sha256"]},
-		sha1Hash: control.SHA1FileHash{hashes["sha1"]},
-		md5Hash: control.MD5FileHash{hashes["md5"]},
-	}
-	return nil
-}
-
-// Generate and cache all the Package/Repo files
-func (r *Repo) GenerateFiles() error {
-	for _, arch := range r.GetArches() {
-		if err := r.makePackagesFileForArch(arch); err != nil {
-			return fmt.Errorf("generating files for arch %s: %w", arch, err)
-		}
-	}
-	r.makeRelease()
-	return nil
-}
-
-func (r *Repo) makeRelease() {
-	var rel bytes.Buffer
-		enc, _ := control.NewEncoder(&rel)
-		const dateFmt = "Mon, 02 Jan 2006 15:04:05 MST"
-		var md5s []control.MD5FileHash
-		var sha1s []control.SHA1FileHash
-		var sha256s []control.SHA256FileHash
-		for _, f := range r.cache {
-			md5s = append(md5s, f.md5Hash)
-			sha1s = append(sha1s, f.sha1Hash)
-			sha256s = append(sha256s, f.sha256Hash)
-		}
-		if err := enc.Encode(Release{
-			Suite: "stable",
-			Architectures: r.GetArches(),
-			Components: "main",
-			Date: time.Now().UTC().Format(dateFmt),
-			MD5Sum: md5s,
-			SHA1: sha1s,
-			SHA256: sha256s,
-		}); err != nil {
-			log.Fatal(err)
-		}
-		r.release = rel.Bytes()
-		return
-	}
-
-
-// Handle a deb/apt repository http request
-func (r *Repo) GetHandler(keyring *crypto.KeyRing) http.Handler {
-	router := chi.NewRouter()
-	router.Get("/Release", func(w http.ResponseWriter, req *http.Request) {
-		if _, err := w.Write(r.release); err != nil {
-			log.Fatal(err)
-		}
-	})
-	router.Get("/Release.gpg", func(w http.ResponseWriter, req *http.Request) {
-		msg := crypto.NewPlainMessage(r.release)
-		sig, err := keyring.SignDetached(msg)
 	if err != nil {
-			log.Fatal(err)
+		return nil, fmt.Errorf("read deb: %w", err)
 	}
-		sigStr, err := sig.GetArmored()
+	md5sum := md5.New()
+	sha1sum := sha1.New()
+	sha256sum := sha256.New()
+	hashWriter := io.MultiWriter(md5sum, sha1sum, sha256sum)
+	size, err := io.Copy(hashWriter, r)
 	if err != nil {
-			log.Fatal(err)
+		return nil, fmt.Errorf("hash file: %w", err)
 	}
-		io.WriteString(w, sigStr)
+	bi := control.BinaryIndex{
-	})
+		Paragraph: control.Paragraph{
-	router.Get("/main/{arch}/Packages", func(w http.ResponseWriter, req *http.Request) {
+			Values: make(map[string]string),
-		h, ok := r.cache[fmt.Sprintf("main/%s/Packages", chi.URLParam(req, "arch"))]
+		},
-		if !ok {
+		Package:       debFile.Control.Package,
-			w.WriteHeader(http.StatusBadRequest)
+		Source:        debFile.Control.Source,
-			return
+		Version:       debFile.Control.Version,
+		InstalledSize: fmt.Sprintf("%d", debFile.Control.InstalledSize),
+		Size:          strconv.Itoa(int(size)),
+		Maintainer:    debFile.Control.Maintainer,
+		Architecture:  debFile.Control.Architecture,
+		MultiArch:     debFile.Control.MultiArch,
+		Description:   debFile.Control.Description,
+		Homepage:      debFile.Control.Homepage,
+		Section:       debFile.Control.Section,
+		// FIXME: gross, make this more centrally managed somehow
+		Filename: strings.TrimPrefix(filePath, "/"),
+		Priority: debFile.Control.Priority,
+		MD5sum:   fmt.Sprintf("%x", md5sum.Sum(nil)),
+		SHA1:     fmt.Sprintf("%x", sha1sum.Sum(nil)),
+		SHA256:   fmt.Sprintf("%x", sha256sum.Sum(nil)),
 	}
-		_, err := w.Write(h.buf); if err != nil {
+	if debFile.Control.Depends.String() != "" {
-			log.Error(err)
+		bi.Paragraph.Set("Depends", debFile.Control.Depends.String())
 	}
-	})
+	if debFile.Control.Recommends.String() != "" {
-	return router
+		bi.Paragraph.Set("Recommends", debFile.Control.Recommends.String())
+	}
+	if debFile.Control.Suggests.String() != "" {
+		bi.Paragraph.Set("Suggests", debFile.Control.Suggests.String())
+	}
+	if debFile.Control.Breaks.String() != "" {
+		bi.Paragraph.Set("Breaks", debFile.Control.Breaks.String())
+	}
+	if debFile.Control.Replaces.String() != "" {
+		bi.Paragraph.Set("Replaces", debFile.Control.Replaces.String())
+	}
+	if debFile.Control.BuiltUsing.String() != "" {
+		bi.Paragraph.Set("BuiltUsing", debFile.Control.BuiltUsing.String())
+	}
+	return &bi, nil
 }

release.go

@@ -11,6 +11,6 @@ type Release struct {
 	Components    string
 	Date          string
 	SHA1          []control.SHA1FileHash   `delim:"\n" strip:"\n\r\t "`
-	SHA256        []control.SHA256FileHash`delim:"\n" strip:"\n\r\t "`
+	SHA256        []control.SHA256FileHash `delim:"\n" strip:"\n\r\t "`
-	MD5Sum        []control.MD5FileHash`delim:"\n" strip:"\n\r\t "`
+	MD5Sum        []control.MD5FileHash    `delim:"\n" strip:"\n\r\t "`
 }

repo.go

@@ -0,0 +1,208 @@
+package debanator
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"net/http"
+	"path"
+	"time"
+
+	"github.com/ProtonMail/gopenpgp/v2/crypto"
+	"github.com/go-chi/chi/v5"
+	log "github.com/sirupsen/logrus"
+	"golang.org/x/exp/maps"
+	"pault.ag/go/debian/control"
+	"pault.ag/go/debian/dependency"
+	"pault.ag/go/debian/hashio"
+	"pault.ag/go/debian/version"
+)
+
+const FILESPREFIX = "pool"
+
+type hashedFile struct {
+	buf        []byte
+	md5Hash    control.MD5FileHash
+	sha1Hash   control.SHA1FileHash
+	sha256Hash control.SHA256FileHash
+}
+
+type Repo struct {
+	// The prefix to serving http paths to the files provided by this package.
+	// This is needed so that we can give absolute paths in Package files.
+	filePrefix string
+	be         Backend
+	packages   []LogicalPackage
+	cache      map[string]hashedFile
+	release    []byte
+}
+
+func NewRepoFromBackend(backend Backend, filePrefix string) Repo {
+	return Repo{
+		be:         backend,
+		cache:      make(map[string]hashedFile),
+		filePrefix: filePrefix,
+	}
+}
+
+func (r *Repo) GetArches() []dependency.Arch {
+	arches := make(map[dependency.Arch]struct{})
+	for _, lp := range r.packages {
+		for arch := range lp.Arches {
+			arches[arch] = struct{}{}
+		}
+	}
+	return maps.Keys(arches)
+}
+
+// Find the latest versions of all packages for the given arch
+func (r *Repo) GetPackagesForArch(a dependency.Arch) []control.BinaryIndex {
+	out := []control.BinaryIndex{}
+	for _, p := range r.packages {
+		if versions, ok := p.Arches[a]; ok {
+			var latest version.Version
+			for v := range versions {
+				if version.Compare(v, latest) > 0 {
+					latest = v
+				}
+			}
+			out = append(out, p.Arches[a][latest])
+		}
+	}
+	return out
+}
+
+func (r *Repo) makePackagesFileForArch(arch dependency.Arch) error {
+	var b bytes.Buffer
+	w, hashers, err := hashio.NewHasherWriters([]string{"md5", "sha256", "sha1"}, &b)
+	enc, _ := control.NewEncoder(w)
+	for _, d := range r.GetPackagesForArch(arch) {
+		if err = enc.Encode(d); err != nil {
+			return fmt.Errorf("encoding package %s: %w", d.Package, err)
+		}
+	}
+	fname := fmt.Sprintf("main/binary-%s/Packages", arch)
+	hashes := make(map[string]control.FileHash)
+	for _, h := range hashers {
+		hashes[h.Name()] = control.FileHashFromHasher(fname, *h)
+	}
+	r.cache[fname] = hashedFile{
+		buf: b.Bytes(),
+		sha256Hash: control.SHA256FileHash{
+			FileHash: hashes["sha256"],
+		},
+		sha1Hash: control.SHA1FileHash{
+			FileHash: hashes["sha1"]},
+		md5Hash: control.MD5FileHash{FileHash: hashes["md5"]},
+	}
+	return nil
+}
+
+// Generate and cache all the Package/Repo files
+func (r *Repo) GenerateFiles() error {
+	for _, arch := range r.GetArches() {
+		if err := r.makePackagesFileForArch(arch); err != nil {
+			return fmt.Errorf("generating files for arch %s: %w", arch, err)
+		}
+	}
+	r.makeRelease()
+	return nil
+}
+
+func (r *Repo) makeRelease() {
+	var rel bytes.Buffer
+	enc, _ := control.NewEncoder(&rel)
+	const dateFmt = "Mon, 02 Jan 2006 15:04:05 MST"
+	var md5s []control.MD5FileHash
+	var sha1s []control.SHA1FileHash
+	var sha256s []control.SHA256FileHash
+	for _, f := range r.cache {
+		md5s = append(md5s, f.md5Hash)
+		sha1s = append(sha1s, f.sha1Hash)
+		sha256s = append(sha256s, f.sha256Hash)
+	}
+	if err := enc.Encode(Release{
+		Suite:         "stable",
+		Architectures: r.GetArches(),
+		Components:    "main",
+		Date:          time.Now().UTC().Format(dateFmt),
+		MD5Sum:        md5s,
+		SHA1:          sha1s,
+		SHA256:        sha256s,
+	}); err != nil {
+		log.Fatal(err)
+	}
+	r.release = rel.Bytes()
+	return
+}
+
+// Handle a deb/apt repository http request
+func (r *Repo) GetHandler(keyring *crypto.KeyRing) http.Handler {
+	router := chi.NewRouter()
+	router.Get("/Release", func(w http.ResponseWriter, req *http.Request) {
+		if _, err := w.Write(r.release); err != nil {
+			log.Fatal(err)
+		}
+	})
+	router.Get("/Release.gpg", func(w http.ResponseWriter, req *http.Request) {
+		msg := crypto.NewPlainMessage(r.release)
+		sig, err := keyring.SignDetached(msg)
+		if err != nil {
+			log.Fatal(err)
+		}
+		sigStr, err := sig.GetArmored()
+		if err != nil {
+			log.Fatal(err)
+		}
+		io.WriteString(w, sigStr)
+	})
+	router.Get("/main/{arch}/Packages", func(w http.ResponseWriter, req *http.Request) {
+		h, ok := r.cache[fmt.Sprintf("main/%s/Packages", chi.URLParam(req, "arch"))]
+		if !ok {
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		}
+		_, err := w.Write(h.buf)
+		if err != nil {
+			log.Error(err)
+		}
+	})
+	router.Get(fmt.Sprintf("/%s/*", FILESPREFIX), r.be.ServeFiles(r.filePrefix).ServeHTTP)
+	return router
+}
+
+func (r *Repo) Populate() error {
+	packs := make(map[string]LogicalPackage)
+	files := Unwrap(r.be.GetFiles())
+	for _, f := range files {
+		rd := Unwrap(f.GetReader())
+		bi, err := BinaryIndexFromDeb(rd, path.Join(r.filePrefix, FILESPREFIX, f.GetName()))
+		if err != nil {
+			return fmt.Errorf("processing deb file: %w", err)
+		}
+
+		packageName := bi.Package
+		if _, ok := packs[packageName]; !ok {
+			packs[packageName] = LogicalPackage{
+				Name:   packageName,
+				Arches: make(map[dependency.Arch]map[version.Version]control.BinaryIndex),
+			}
+		}
+		pack := packs[packageName]
+		if _, ok := pack.Arches[bi.Architecture]; !ok {
+			pack.Arches[bi.Architecture] = make(map[version.Version]control.BinaryIndex)
+		}
+		arch := pack.Arches[bi.Architecture]
+		if _, ok := arch[bi.Version]; !ok {
+			arch[bi.Version] = *bi
+		} else {
+			log.WithFields(log.Fields{
+				"package": packageName,
+				"arch":    arch,
+				"version": bi.Version.String(),
+			}).Warn("Duplicate package/arch/version found, ignoring...")
+		}
+	}
+	r.packages = maps.Values(packs)
+	return nil
+}

util.go

@@ -0,0 +1,16 @@
+package debanator
+
+import (
+	log "github.com/sirupsen/logrus"
+)
+
+func Md(err error) {
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func Unwrap[T any](val T, err error) T {
+	Md(err)
+	return val
+}