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 /*
   9  * Do replace refs need to be checked this run?  This variable is
  10  * initialized to true unless --no-replace-object is used or
  11  * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some
  12  * commands that do not want replace references to be active.
  13  */
  14 extern int read_replace_refs;
  15
  16 struct replace_object {
  17         struct oidmap_entry original;
  18         struct object_id replacement;
  19 };
  20
  21 void prepare_replace_object(struct repository *r);
  22
  23 /*
  24  * This internal function is only declared here for the benefit of
  25  * lookup_replace_object().  Please do not call it directly.
  26  */
  27 const struct object_id *do_lookup_replace_object(struct repository *r,
  28                                                  const struct object_id *oid);
  29
  30 /*
  31  * If object sha1 should be replaced, return the replacement object's
  32  * name (replaced recursively, if necessary).  The return value is
  33  * either sha1 or a pointer to a permanently-allocated value.  When
  34  * object replacement is suppressed, always return sha1.
  35  *
  36  * Note: some thread debuggers might point a data race on the
  37  * replace_map_initialized reading in this function. However, we know there's no
  38  * problem in the value being updated by one thread right after another one read
  39  * it here (and it should be written to only once, anyway).
  40  */
  41 static inline const struct object_id *lookup_replace_object(struct repository *r,
  42                                                             const struct object_id *oid)
  43 {
  44         if (!read_replace_refs ||
  45             (r->objects->replace_map_initialized &&
  46              r->objects->replace_map->map.tablesize == 0))
  47                 return oid;
  48         return do_lookup_replace_object(r, oid);
  49 }
  50
  51 #endif /* REPLACE_OBJECT_H */