Clean Install function and Download function

internal/internal.go

@@ -1,11 +1,16 @@
 package internal
 
 import (
+	"archive/tar"
 	"errors"
 	"io"
 	"log"
 	"net/http"
 	"os"
+	"path/filepath"
+
+	"github.com/klauspost/compress/zstd"
+	"github.com/pelletier/go-toml/v2"
 )
 
 // const
@@ -17,6 +22,25 @@ const DefaultData_d = "/opt/packets"
 
 // errors
 var ErrResponseNot200OK = errors.New("the request is not 200, download failed")
+var ErrCantFindManifestTOML = errors.New("can't find manifest.toml when trying to read the packagefile")
+
+// toml files
+
+type Manifest struct {
+	Info struct {
+		Name         string   `toml:"name"`
+		Version      string   `toml:"version"`
+		Description  string   `toml:"description"`
+		Dependencies []string `toml:"dependencies"`
+		Author       string   `toml:"author"`
+		Family       string   `toml:"family"`
+		Serial       uint     `toml:"serial"`
+	} `toml:"Info"`
+	Hooks struct {
+		Install string `toml:"install"`
+		Remove  string `toml:"remove"`
+	} `toml:"Hooks"`
+}
 
 type ConfigTOML struct {
 	Config struct {
@@ -77,3 +101,52 @@ func DefaultConfigTOML() (*ConfigTOML, error) {
 
 	return &config, nil
 }
+
+func ReadManifest(file *os.File) (*Manifest, error) {
+	zstdReader, err := zstd.NewReader(file)
+	if err != nil {
+		return nil, err
+	}
+	defer zstdReader.Close()
+
+	tarReader := tar.NewReader(zstdReader)
+	for {
+		header, err := tarReader.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return nil, err
+		}
+
+		if filepath.Base(header.Name) == "manifest.toml" {
+			decoder := toml.NewDecoder(tarReader)
+
+			var manifest Manifest
+
+			if err := decoder.Decode(&manifest); err != nil {
+				log.Fatal(err)
+			}
+
+			return &manifest, nil
+		}
+
+	}
+	return nil, ErrCantFindManifestTOML
+}
+
+func GetConfigTOML() (*ConfigTOML, error) {
+	f, err := os.Open(filepath.Join(DefaultLinux_d, "config.toml"))
+	if err != nil {
+		return nil, err
+	}
+
+	decoder := toml.NewDecoder(f)
+
+	var config ConfigTOML
+	if err := decoder.Decode(&config); err != nil {
+		return nil, err
+	}
+
+	return &config, nil
+}