check: move from container

This package is not container specific, and widely used across the project.

Signed-off-by: Ophestra <cat@gensokyo.uk>

container/check/overlay.go

@@ -1,30 +0,0 @@
-package check
-
-import "strings"
-
-const (
-	// SpecialOverlayEscape is the escape string for overlay mount options.
-	SpecialOverlayEscape = `\`
-	// SpecialOverlayOption is the separator string between overlay mount options.
-	SpecialOverlayOption = ","
-	// SpecialOverlayPath is the separator string between overlay paths.
-	SpecialOverlayPath = ":"
-)
-
-// EscapeOverlayDataSegment escapes a string for formatting into the data
-// argument of an overlay mount system call.
-func EscapeOverlayDataSegment(s string) string {
-	if s == "" {
-		return ""
-	}
-
-	if f := strings.SplitN(s, "\x00", 2); len(f) > 0 {
-		s = f[0]
-	}
-
-	return strings.NewReplacer(
-		SpecialOverlayEscape, SpecialOverlayEscape+SpecialOverlayEscape,
-		SpecialOverlayOption, SpecialOverlayEscape+SpecialOverlayOption,
-		SpecialOverlayPath, SpecialOverlayEscape+SpecialOverlayPath,
-	).Replace(s)
-}