1 files changed, 0 insertions, 115 deletions
diff --git a/container/vfs/unfold.go b/container/vfs/unfold.go
deleted file mode 100644
index 37c4cef3..00000000
--- a/container/vfs/unfold.go
+++ /dev/null
@@ -1,115 +0,0 @@
-package vfs
-
-import (
-	"iter"
-	"path"
-	"strings"
-)
-
-// UnfoldTargetError is a pathname that never appeared in a mount hierarchy.
-type UnfoldTargetError string
-
-func (e UnfoldTargetError) Error() string {
-	return "mount point " + string(e) + " never appeared in mountinfo"
-}
-
-// MountInfoNode positions a [MountInfoEntry] in its mount hierarchy.
-type MountInfoNode struct {
-	*MountInfoEntry
-	FirstChild  *MountInfoNode `json:"first_child"`
-	NextSibling *MountInfoNode `json:"next_sibling"`
-
-	Clean   string `json:"clean"`
-	Covered bool   `json:"covered"`
-}
-
-// Collective returns an iterator over visible mountinfo nodes.
-func (n *MountInfoNode) Collective() iter.Seq[*MountInfoNode] {
-	return func(yield func(*MountInfoNode) bool) { n.visit(yield) }
-}
-
-// visit recursively visits all visible mountinfo nodes.
-func (n *MountInfoNode) visit(yield func(*MountInfoNode) bool) bool {
-	if !n.Covered && !yield(n) {
-		return false
-	}
-	for cur := n.FirstChild; cur != nil; cur = cur.NextSibling {
-		if !cur.visit(yield) {
-			return false
-		}
-	}
-	return true
-}
-
-// Unfold unfolds the mount hierarchy and resolves covered paths.
-func (d *MountInfoDecoder) Unfold(target string) (*MountInfoNode, error) {
-	targetClean := path.Clean(target)
-
-	var mountinfoSize int
-	for range d.Entries() {
-		mountinfoSize++
-	}
-	if err := d.Err(); err != nil {
-		return nil, err
-	}
-
-	mountinfo := make([]*MountInfoNode, mountinfoSize)
-	// mount ID to index lookup
-	idIndex := make(map[int]int, mountinfoSize)
-	// final entry to match target
-	targetIndex := -1
-	{
-		i := 0
-		for ent := range d.Entries() {
-			mountinfo[i] = &MountInfoNode{Clean: path.Clean(ent.Target), MountInfoEntry: ent}
-			idIndex[ent.ID] = i
-			if mountinfo[i].Clean == targetClean {
-				targetIndex = i
-			}
-
-			i++
-		}
-	}
-
-	if targetIndex == -1 {
-		// target does not exist in parsed mountinfo
-		return nil, &DecoderError{Op: "unfold", Line: -1, Err: UnfoldTargetError(targetClean)}
-	}
-
-	for _, cur := range mountinfo {
-		var parent *MountInfoNode
-		if p, ok := idIndex[cur.Parent]; !ok {
-			continue
-		} else {
-			parent = mountinfo[p]
-		}
-
-		if !strings.HasPrefix(cur.Clean, targetClean) {
-			continue
-		}
-		if parent.Clean == cur.Clean {
-			parent.Covered = true
-		}
-
-		covered := false
-		nsp := &parent.FirstChild
-		for s := parent.FirstChild; s != nil; s = s.NextSibling {
-			if strings.HasPrefix(cur.Clean, s.Clean) {
-				covered = true
-				break
-			}
-
-			if strings.HasPrefix(s.Clean, cur.Clean) {
-				*nsp = s.NextSibling
-			} else {
-				nsp = &s.NextSibling
-			}
-		}
-		if covered {
-			continue
-		}
-		*nsp = cur
-	}
-
-	return mountinfo[targetIndex], nil
-}