template: Generate debian/upstream/metadata too

Fixes #144

template.go

@@ -46,6 +46,9 @@ func writeTemplates(dir, gopkg, debsrc, debLib, debProg, debversion string,
 	if err := writeDebianPackageInstall(dir, debLib, debProg, pkgType); err != nil {
 		return err
 	}
+	if err := writeDebianUpstreamMetadata(dir, gopkg); err != nil {
+		return err
+	}
 
 	if err := writeDebianGbpConf(dir, dep14, pristineTar); err != nil {
 		return err
@@ -377,6 +380,37 @@ func writeDebianPackageInstall(dir, debLib, debProg string, pkgType packageType)
 	return nil
 }
 
+func writeDebianUpstreamMetadata(dir, gopkg string) error {
+	// TODO: Support other hosters too
+	host := "github.com"
+
+	owner, repo, err := findGitHubRepo(gopkg)
+	if err != nil {
+		log.Printf("debian/upstream/metadata: Unable to resolve %s to github.com, skipping\n", gopkg)
+		return nil
+	}
+	if !strings.HasPrefix(gopkg, "github.com/") {
+		log.Printf("debian/upstream/metadata: %s resolves to %s/%s/%s\n", gopkg, host, owner, repo)
+	}
+
+	if err := os.Mkdir(filepath.Join(dir, "debian", "upstream"), 0755); err != nil {
+		return err
+	}
+	f, err := os.Create(filepath.Join(dir, "debian", "upstream", "metadata"))
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	fmt.Fprintf(f, "---\n")
+	fmt.Fprintf(f, "Bug-Database: https://%s/%s/%s/issues\n", host, owner, repo)
+	fmt.Fprintf(f, "Bug-Submit: https://%s/%s/%s/issues/new\n", host, owner, repo)
+	fmt.Fprintf(f, "Repository: https://%s/%s/%s.git\n", host, owner, repo)
+	fmt.Fprintf(f, "Repository-Browse: https://%s/%s/%s\n", host, owner, repo)
+
+	return nil
+}
+
 func writeDebianGitLabCI(dir string) error {
 	const gitlabciymlTmpl = `# auto-generated, DO NOT MODIFY.
 # The authoritative copy of this file lives at: