Try a different project structure

deb/archive/archive.go

@@ -0,0 +1,82 @@
+package archive
+
+import (
+	"os"
+	"fmt"
+	"github.com/blakesmith/ar"
+	"bytes"
+	"io"
+	"strings"
+	"compress/gzip"
+	"archive/tar"
+	"log"
+)
+
+func InspectPackage(filename string) (string, error) {
+	f, err := os.Open(filename)
+
+	if err != nil {
+		return "", fmt.Errorf("error opening package file %s: %s", filename, err)
+	}
+
+	arReader := ar.NewReader(f)
+	defer f.Close()
+	var controlBuf bytes.Buffer
+
+	for {
+		header, err := arReader.Next()
+
+		if err == io.EOF {
+			break
+		}
+
+		if err != nil {
+			return "", fmt.Errorf("error in inspectPackage loop: %s", err)
+		}
+
+		if strings.Trim(header.Name, "/") == "control.tar.gz" {
+			io.Copy(&controlBuf, arReader)
+			return InspectPackageControl(controlBuf)
+		}
+	}
+	return "", nil
+}
+
+func InspectPackageControl(filename bytes.Buffer) (string, error) {
+	gzf, err := gzip.NewReader(bytes.NewReader(filename.Bytes()))
+	if err != nil {
+		return "", fmt.Errorf("error creating gzip reader: %s", err)
+	}
+
+	tarReader := tar.NewReader(gzf)
+	var controlBuf bytes.Buffer
+	for {
+		header, err := tarReader.Next()
+
+		if err == io.EOF {
+			break
+		}
+
+		if err != nil {
+			return "", fmt.Errorf("failed to inspect package: %s", err)
+		}
+
+		name := header.Name
+
+		switch header.Typeflag {
+		case tar.TypeDir:
+			continue
+		case tar.TypeReg:
+			if name == "./control" {
+				io.Copy(&controlBuf, tarReader)
+				return controlBuf.String(), nil
+			}
+		default:
+			log.Printf(
+				"Unable to figure out type : %c in file %s\n",
+				header.Typeflag, name,
+			)
+		}
+	}
+	return "", nil
+}