cluster: add DirFS() using hackpadfs/os

Signed-off-by: Alejandro Mery <amery@jpi.io>

pkg/cluster/cluster_fs.go

@@ -0,0 +1,25 @@
+package cluster
+
+import (
+	"io/fs"
+	"path/filepath"
+
+	"github.com/hack-pad/hackpadfs/os"
+)
+
+// DirFS returns a file system (an [fs.FS]) for the tree
+// of files rooted at the directory dir.
+func DirFS(dir string) (fs.FS, error) {
+	dir = filepath.Clean(dir)
+	fullPath, err := filepath.Abs(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	sub, err := os.NewFS().Sub(fullPath[1:])
+	if err != nil {
+		return nil, err
+	}
+
+	return sub, nil
+}

pkg/cluster/cluster_scan_options.go

@@ -6,7 +6,6 @@ import (
 
 	"darvaza.org/resolver"
 	"darvaza.org/slog"
-	"github.com/hack-pad/hackpadfs/os"
 )
 
 // A ScanOption pre-configures the Zones before scanning
@@ -101,7 +100,7 @@ func NewFromDirectory(dir, domain string, opts ...ScanOption) (*Cluster, error)
 		return nil, err
 	}
 
-	sub, err := os.NewFS().Sub(fullPath[1:])
+	sub, err := DirFS(dir)
 	if err != nil {
 		return nil, err
 	}