refactor: use pkg directory structure

pkg/recipe/recipe.go

@@ -0,0 +1,68 @@
+package recipe
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"strings"
+
+	"coopcloud.tech/abra/pkg/config"
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing"
+)
+
+// EnsureExists checks whether a recipe has been cloned locally or not.
+func EnsureExists(recipe string) error {
+	recipeDir := path.Join(config.ABRA_DIR, "apps", strings.ToLower(recipe))
+
+	if _, err := os.Stat(recipeDir); os.IsNotExist(err) {
+		url := fmt.Sprintf("%s/%s.git", config.REPOS_BASE_URL, recipe)
+		_, err := git.PlainClone(recipeDir, false, &git.CloneOptions{URL: url, Tags: git.AllTags})
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// EnsureVersion checks whether a specific version exists for a recipe.
+func EnsureVersion(version string) error {
+	recipeDir := path.Join(config.ABRA_DIR, "apps", strings.ToLower(version))
+
+	repo, err := git.PlainOpen(recipeDir)
+	if err != nil {
+		return err
+	}
+
+	tags, err := repo.Tags()
+	if err != nil {
+		return nil
+	}
+
+	var tagRef plumbing.ReferenceName
+	if err := tags.ForEach(func(ref *plumbing.Reference) (err error) {
+		if ref.Name().Short() == version {
+			tagRef = ref.Name()
+		}
+		return nil
+	}); err != nil {
+		return err
+	}
+
+	if tagRef.String() == "" {
+		return fmt.Errorf("%s is not available?", version)
+	}
+
+	worktree, err := repo.Worktree()
+	if err != nil {
+		return err
+	}
+
+	opts := &git.CheckoutOptions{Branch: tagRef, Keep: true}
+	if err := worktree.Checkout(opts); err != nil {
+		return err
+	}
+
+	return nil
+}