From 04e1b6bf4a47bfd99af703e6421e039a969fc6de Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Fri, 6 Mar 2026 21:19:38 +0800
Subject: reachability: Peel root to commit

---
 reachability/ancestor.go |  4 ++--
 reachability/peel.go     | 10 +++-------
 2 files changed, 5 insertions(+), 9 deletions(-)

(limited to 'reachability')

diff --git a/reachability/ancestor.go b/reachability/ancestor.go
index 211aed01..584ec0e3 100644
--- a/reachability/ancestor.go
+++ b/reachability/ancestor.go
@@ -12,12 +12,12 @@ import (
 //
 // Both inputs are peeled through annotated tags before commit traversal.
 func (r *Reachability) IsAncestor(ancestor, descendant objectid.ObjectID) (bool, error) {
-	ancestorCommit, err := r.peelRootToDomain(ancestor, DomainCommits)
+	ancestorCommit, err := r.peelRootToCommit(ancestor)
 	if err != nil {
 		return false, err
 	}
 
-	descendantCommit, err := r.peelRootToDomain(descendant, DomainCommits)
+	descendantCommit, err := r.peelRootToCommit(descendant)
 	if err != nil {
 		return false, err
 	}
diff --git a/reachability/peel.go b/reachability/peel.go
index e8120ef7..5f24982e 100644
--- a/reachability/peel.go
+++ b/reachability/peel.go
@@ -6,12 +6,8 @@ import (
 	"codeberg.org/lindenii/furgit/objecttype"
 )
 
-func (r *Reachability) peelRootToDomain(id objectid.ObjectID, domain Domain) (objectid.ObjectID, error) {
-	err := validateDomain(domain)
-	if err != nil {
-		return objectid.ObjectID{}, err
-	}
-
+// peelRootToCommit peels annotated tags transitively until a commit is reached.
+func (r *Reachability) peelRootToCommit(id objectid.ObjectID) (objectid.ObjectID, error) {
 	for {
 		ty, err := r.readHeaderType(id)
 		if err != nil {
@@ -19,7 +15,7 @@ func (r *Reachability) peelRootToDomain(id objectid.ObjectID, domain Domain) (ob
 		}
 
 		if ty != objecttype.TypeTag {
-			if domain == DomainCommits && ty != objecttype.TypeCommit {
+			if ty != objecttype.TypeCommit {
 				return objectid.ObjectID{}, &ObjectTypeError{OID: id, Got: ty, Want: objecttype.TypeCommit}
 			}
 
-- 
cgit v1.3.1-10-gc9f91