Teach fsck about partial commits

An OSTree user noticed that `ostree fsck` would produce `missing
object` errors in the case of interrupted pulls.

It's possible to do e.g. `ostree pull --subpath=/usr/share/rpm ...`,
which gets you just that portion of the commit.  The use case for this
was being able to see what changes would appear in an update before
actually downloading all of it.

(I think this would be better covered by static deltas, but those
 aren't final yet, and `--subpath` predates it)

Further, `.commitpartial` is used as a successor to the `transaction`
symlink for more precise knowledge in the case where a pull was
interrupted that we needed to resume scanning.

So it makes sense for `ostree fsck` to be aware of it.

src/libostree/ostree-repo.c

@@ -2651,6 +2651,58 @@ ostree_repo_load_variant (OstreeRepo       *self,
                                  out_variant, NULL, NULL, NULL, error);
 }
 
+/**
+ * ostree_repo_load_commit:
+ * @self: Repo
+ * @checksum: Commit checksum
+ * @out_commit: (out) (allow-none): Commit
+ * @out_state: (out) (allow-none): Commit state
+ * @error: Error
+ *
+ * A version of ostree_repo_load_variant() specialized to commits,
+ * capable of returning extended state information.  Currently
+ * the only extended state is %OSTREE_REPO_COMMIT_STATE_PARTIAL, which
+ * means that only a sub-path of the commit is available.
+ */
+gboolean
+ostree_repo_load_commit (OstreeRepo            *self,
+                         const char            *checksum, 
+                         GVariant             **out_variant,
+                         OstreeRepoCommitState *out_state,
+                         GError               **error)
+{
+  gboolean ret = FALSE;
+
+  if (out_variant)
+    {
+      if (!load_metadata_internal (self, OSTREE_OBJECT_TYPE_COMMIT, checksum, TRUE,
+                                   out_variant, NULL, NULL, NULL, error))
+        goto out;
+    }
+
+  if (out_state)
+    {
+      g_autofree char *commitpartial_path = _ostree_get_commitpartial_path (checksum);
+      struct stat stbuf;
+
+      *out_state = 0;
+
+      if (fstatat (self->repo_dir_fd, commitpartial_path, &stbuf, 0) == 0)
+        {
+          *out_state |= OSTREE_REPO_COMMIT_STATE_PARTIAL;
+        }
+      else if (errno != ENOENT)
+        {
+          glnx_set_error_from_errno (error);
+          goto out;
+        }
+    }
+
+  ret = TRUE;
+ out:
+  return ret;
+}
+
 /**
  * ostree_repo_list_objects:
  * @self: Repo