Package repository, first version.

debian/repository.go

@@ -0,0 +1,37 @@
+package debian
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+)
+
+// Repository abstract file system with package pool and published package repos
+type Repository struct {
+	RootPath string
+}
+
+// NewRepository creates new instance of repository which specified root
+func NewRepository(root string) *Repository {
+	return &Repository{RootPath: root}
+}
+
+// PoolPath returns full path to package file in pool
+//
+// PoolPath checks that final path doesn't go out of repository root path
+func (r *Repository) PoolPath(filename string) (string, error) {
+	filename = filepath.Clean(filename)
+	if strings.HasPrefix(filename, ".") {
+		return "", fmt.Errorf("filename %s starts with dot", filename)
+	}
+
+	if filepath.IsAbs(filename) {
+		return "", fmt.Errorf("absolute filename %s not supported", filename)
+	}
+
+	if strings.HasPrefix(filename, "pool/") {
+		filename = filename[5:]
+	}
+
+	return filepath.Join(r.RootPath, "pool", filename), nil
+}