fsck: Mark commits with missing or deleted object partial

This means we can later use various operations to heal the repository
because ostree does not assume all objects are there.

This the begining of a fix for https://github.com/ostreedev/ostree/pull/345

Closes: #1533
Approved by: cgwalters

src/ostree/ot-builtin-fsck.c

@@ -53,6 +53,8 @@ static gboolean
 fsck_one_object (OstreeRepo            *repo,
                  const char            *checksum,
                  OstreeObjectType       objtype,
+                 GHashTable            *object_parents,
+                 GVariant              *key,
                  gboolean              *out_found_corruption,
                  GCancellable          *cancellable,
                  GError               **error)
@@ -60,12 +62,14 @@ fsck_one_object (OstreeRepo            *repo,
   g_autoptr(GError) temp_error = NULL;
   if (!ostree_repo_fsck_object (repo, objtype, checksum, cancellable, &temp_error))
     {
+      gboolean object_missing = FALSE;
+
       if (g_error_matches (temp_error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND))
         {
           g_clear_error (&temp_error);
           g_printerr ("Object missing: %s.%s\n", checksum,
                       ostree_object_type_to_string (objtype));
-          *out_found_corruption = TRUE;
+          object_missing = TRUE;
         }
       else
         {
@@ -73,7 +77,7 @@ fsck_one_object (OstreeRepo            *repo,
             {
               g_printerr ("%s\n", temp_error->message);
               (void) ostree_repo_delete_object (repo, objtype, checksum, cancellable, NULL);
-              *out_found_corruption = TRUE;
+              object_missing = TRUE;
             }
           else
             {
@@ -81,6 +85,26 @@ fsck_one_object (OstreeRepo            *repo,
               return FALSE;
             }
         }
+
+      if (object_missing)
+        {
+          *out_found_corruption = TRUE;
+
+          if (object_parents != NULL && objtype != OSTREE_OBJECT_TYPE_COMMIT)
+            {
+              g_auto(GStrv) parent_commits =  ostree_repo_traverse_parents_get_commits (object_parents, key);
+              int i;
+
+              /* The commit was missing or deleted, mark the commit partial */
+              for (i = 0; parent_commits[i] != NULL; i++)
+                {
+                  const char *parent_commit = parent_commits[i];
+                  g_printerr ("Marking commit %s as partial\n", parent_commit);
+                  if (!ostree_repo_mark_commit_partial (repo, parent_commit, TRUE, error))
+                    return FALSE;
+                }
+            }
+        }
     }
 
   return TRUE;
@@ -94,6 +118,7 @@ fsck_reachable_objects_from_commits (OstreeRepo            *repo,
                                      GError               **error)
 {
   g_autoptr(GHashTable) reachable_objects = ostree_repo_traverse_new_reachable ();
+  g_autoptr(GHashTable) object_parents = ostree_repo_traverse_new_parents ();
 
   GHashTableIter hash_iter;
   gpointer key, value;
@@ -108,8 +133,8 @@ fsck_reachable_objects_from_commits (OstreeRepo            *repo,
 
       g_assert (objtype == OSTREE_OBJECT_TYPE_COMMIT);
 
-      if (!ostree_repo_traverse_commit_union (repo, checksum, 0, reachable_objects,
-                                              cancellable, error))
+      if (!ostree_repo_traverse_commit_union_with_parents (repo, checksum, 0, reachable_objects, object_parents,
+                                                           cancellable, error))
         return FALSE;
     }
 
@@ -127,8 +152,9 @@ fsck_reachable_objects_from_commits (OstreeRepo            *repo,
 
       ostree_object_name_deserialize (serialized_key, &checksum, &objtype);
 
-      if (!fsck_one_object (repo, checksum, objtype, out_found_corruption,
-                            cancellable, error))
+      if (!fsck_one_object (repo, checksum, objtype,
+                            object_parents, serialized_key,
+                            out_found_corruption, cancellable, error))
         return FALSE;
 
       i++;
@@ -150,7 +176,7 @@ fsck_commit_for_ref (OstreeRepo    *repo,
                      GError       **error)
 {
   if (!fsck_one_object (repo, checksum, OSTREE_OBJECT_TYPE_COMMIT,
-                        found_corruption,
+                        NULL, NULL, found_corruption,
                         cancellable, error))
     return FALSE;