replace-object.h

   1 #ifndef REPLACE_OBJECT_H
   2 #define REPLACE_OBJECT_H
   3
   4 #include "oidmap.h"
   5 #include "repository.h"
   6 #include "object-store.h"
   7
   8 struct replace_object {
   9         struct oidmap_entry original;
  10         struct object_id replacement;
  11 };
  12
  13 void prepare_replace_object(struct repository *r);
  14
  15 /*
  16  * This internal function is only declared here for the benefit of
  17  * lookup_replace_object().  Please do not call it directly.
  18  */
  19 const struct object_id *do_lookup_replace_object(struct repository *r,
  20                                                  const struct object_id *oid);
  21
  22 /*
  23  * If object sha1 should be replaced, return the replacement object's
  24  * name (replaced recursively, if necessary).  The return value is
  25  * either sha1 or a pointer to a permanently-allocated value.  When
  26  * object replacement is suppressed, always return sha1.
  27  *
  28  * Note: some thread debuggers might point a data race on the
  29  * replace_map_initialized reading in this function. However, we know there's no
  30  * problem in the value being updated by one thread right after another one read
  31  * it here (and it should be written to only once, anyway).
  32  */
  33 static inline const struct object_id *lookup_replace_object(struct repository *r,
  34                                                             const struct object_id *oid)
  35 {
  36         if (!read_replace_refs ||
  37             (r->objects->replace_map_initialized &&
  38              r->objects->replace_map->map.tablesize == 0))
  39                 return oid;
  40         return do_lookup_replace_object(r, oid);
  41 }
  42
  43 #endif /* REPLACE_OBJECT_H */