From 362943bf4df40d31f66e12e225daee9d7a49bc0e Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Fri, 6 Mar 2026 11:32:17 +0800
Subject: reachability: Split files

---
 reachability/walk.go | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'reachability/walk.go')

diff --git a/reachability/walk.go b/reachability/walk.go
index 13400e89..e6de8684 100644
--- a/reachability/walk.go
+++ b/reachability/walk.go
@@ -15,3 +15,23 @@ type Walk struct {
 	seqUsed bool
 	err     error
 }
+
+// Walk creates one single-use traversal over the selected domain.
+//
+// In DomainCommits, when a commit-graph reader is attached, parent expansion
+// may use commit-graph metadata for speed.
+func (r *Reachability) Walk(domain Domain, haves, wants map[objectid.ObjectID]struct{}) *Walk {
+	walk := &Walk{
+		reachability: r,
+		domain:       domain,
+		haves:        haves,
+		wants:        wants,
+	}
+
+	err := validateDomain(domain)
+	if err != nil {
+		walk.err = err
+	}
+
+	return walk
+}
-- 
cgit v1.3.1-10-gc9f91