Urgh I made some wrong amends and I'm too tired to separate the commits out this time

ancestor: Split out of reachability
mergebase: Add merge base routines
internal/commitquery: Add commit query context engine thingy
internal/peel: Shared tag peeling
errors: Shared object query errors
internal/testgit: Add rooted repo helpers; remove raw path access
objectstore/memory: Add in-memory object store
objectid: Add Compare helper

1 files changed, 26 insertions, 0 deletions

diff --git a/internal/testgit/repo_open_commit_graph.go b/internal/testgit/repo_open_commit_graph.go
new file mode 100644
index 00000000..4db7261b
--- /dev/null
+++ b/internal/testgit/repo_open_commit_graph.go
@@ -0,0 +1,26 @@
+package testgit
+
+import (
+	"testing"
+
+	commitgraphread "codeberg.org/lindenii/furgit/format/commitgraph/read"
+)
+
+// OpenCommitGraph opens the repository commit-graph and registers cleanup on
+// the caller.
+func (testRepo *TestRepo) OpenCommitGraph(tb testing.TB) *commitgraphread.Reader {
+	tb.Helper()
+
+	objectsRoot := testRepo.OpenObjectsRoot(tb)
+
+	graph, err := commitgraphread.Open(objectsRoot, testRepo.Algorithm(), commitgraphread.OpenSingle)
+	if err != nil {
+		tb.Fatalf("commitgraphread.Open: %v", err)
+	}
+
+	tb.Cleanup(func() {
+		_ = graph.Close()
+	})
+
+	return graph
+}