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, 17 insertions, 0 deletions

diff --git a/objectstore/memory/read_header.go b/objectstore/memory/read_header.go
new file mode 100644
index 00000000..1d0aff15
--- /dev/null
+++ b/objectstore/memory/read_header.go
@@ -0,0 +1,17 @@
+package memory
+
+import (
+	"codeberg.org/lindenii/furgit/objectid"
+	"codeberg.org/lindenii/furgit/objectstore"
+	"codeberg.org/lindenii/furgit/objecttype"
+)
+
+// ReadHeader reads one object header.
+func (store *Store) ReadHeader(id objectid.ObjectID) (objecttype.Type, int64, error) {
+	obj, ok := store.objects[id]
+	if !ok {
+		return objecttype.TypeInvalid, 0, objectstore.ErrObjectNotFound
+	}
+
+	return obj.ty, int64(len(obj.content)), nil
+}