v1.17.1

FIXED:
* tplx/sprigx would throw errors on dnsx.IsPtr, because it returns a
  bool and net.IP instead of a boolen and optional error. Fixed by
  adding dnsx.IsPtrChk and using that instead.

iox/fsx/internal/todo/overlayfs/funcs_realfsmember.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"io/fs"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"r00t2.io/sysutils/paths"
+)
+
+// Open opens file fnm.
+func (r *realFsMember) Open(fnm string) (fh fs.File, err error) {
+
+	if fh, err = r.Root.Open(fnm); err != nil {
+		return
+	}
+
+	return
+}
+
+// ReadDir returns directory entries at fpath joined with the realFsMember's root.
+func (r *realFsMember) ReadDir(fpath string) (entries []fs.DirEntry, err error) {
+
+	var rel string
+	var fsp string = fpath
+
+	if !filepath.IsAbs(fsp) {
+		fsp = filepath.Join(
+			r.Root.Name(),
+			filepath.FromSlash(fsp),
+		)
+	}
+	if err = paths.RealPath(&fsp); err != nil {
+		return
+	}
+	if rel, err = filepath.Rel(r.Root.Name(), fsp); err != nil {
+		// Not relative to this root, so skip.
+		err = nil
+		return
+	}
+	if strings.HasPrefix(rel, "..") {
+		// Absolute but not relative to this root, so skip.
+		return
+	}
+
+	if entries, err = os.ReadDir(fsp); err != nil {
+		return
+	}
+
+	return
+}