Try implementing traverse_commit by hand

rust-bindings/rust/libostree/src/repo.rs

@@ -1,15 +1,62 @@
 use auto::Repo;
-
+use ffi;
 use gio;
 use glib;
+use glib::Error;
 use glib::IsA;
+use glib::translate::*;
+use glib_ffi;
+use std::collections::HashSet;
+use std::ptr;
+
+
+unsafe extern "C" fn read_variant_table(_key: glib_ffi::gpointer, value: glib_ffi::gpointer, hash_set: glib_ffi::gpointer) {
+    let value: glib::Variant = from_glib_none(value as *const glib_ffi::GVariant);
+    let set: &mut HashSet<glib::Variant> = &mut *(hash_set as *mut HashSet<glib::Variant>);
+    set.insert(value);
+}
+
+
+unsafe fn from_glib_container_variant_set(ptr: *mut glib_ffi::GHashTable) -> HashSet<glib::Variant> {
+    let mut set = HashSet::new();
+    glib_ffi::g_hash_table_foreach(ptr, Some(read_variant_table), &mut set as *mut HashSet<glib::Variant> as *mut _);
+    glib_ffi::g_hash_table_unref(ptr);
+    set
+}
+
 
 pub trait RepoExtManual {
     fn new_for_str(path: &str) -> Repo;
+    fn traverse_commit_manual<'a, P: Into<Option<&'a gio::Cancellable>>>(
+        &self,
+        commit_checksum: &str,
+        maxdepth: i32,
+        cancellable: P) -> Result<HashSet<glib::Variant>, Error>;
 }
 
 impl<O: IsA<Repo> + IsA<glib::Object> + Clone + 'static> RepoExtManual for O {
     fn new_for_str(path: &str) -> Repo {
         Repo::new(&gio::File::new_for_path(path))
     }
+
+    fn traverse_commit_manual<'a, P: Into<Option<&'a gio::Cancellable>>>(
+        &self,
+        commit_checksum: &str,
+        maxdepth: i32,
+        cancellable: P,
+    ) -> Result<HashSet<glib::Variant>, Error> {
+        unsafe {
+            let mut error = ptr::null_mut();
+            let mut hashtable = ptr::null_mut();
+            let _ = ffi::ostree_repo_traverse_commit(
+                self.to_glib_none().0,
+                commit_checksum.to_glib_none().0,
+                maxdepth,
+                &mut hashtable,
+                cancellable.into().to_glib_none().0,
+                &mut error,
+            );
+            if error.is_null() { Ok(from_glib_container_variant_set(hashtable)) } else { Err(from_glib_full(error)) }
+        }
+    }
 }