Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "oidmap.h"
   3#include "object-store.h"
   4#include "replace-object.h"
   5#include "refs.h"
   6#include "repository.h"
   7#include "commit.h"
   8
   9static int register_replace_ref(const char *refname,
  10                                const struct object_id *oid,
  11                                int flag, void *cb_data)
  12{
  13        /* Get sha1 from refname */
  14        const char *slash = strrchr(refname, '/');
  15        const char *hash = slash ? slash + 1 : refname;
  16        struct replace_object *repl_obj = xmalloc(sizeof(*repl_obj));
  17
  18        if (get_oid_hex(hash, &repl_obj->original.oid)) {
  19                free(repl_obj);
  20                warning("bad replace ref name: %s", refname);
  21                return 0;
  22        }
  23
  24        /* Copy sha1 from the read ref */
  25        oidcpy(&repl_obj->replacement, oid);
  26
  27        /* Register new object */
  28        if (oidmap_put(the_repository->objects->replace_map, repl_obj))
  29                die("duplicate replace ref: %s", refname);
  30
  31        return 0;
  32}
  33
  34static void prepare_replace_object(struct repository *r)
  35{
  36        if (r->objects->replace_map)
  37                return;
  38
  39        r->objects->replace_map =
  40                xmalloc(sizeof(*the_repository->objects->replace_map));
  41        oidmap_init(r->objects->replace_map, 0);
  42
  43        for_each_replace_ref(r, register_replace_ref, NULL);
  44}
  45
  46/* We allow "recursive" replacement. Only within reason, though */
  47#define MAXREPLACEDEPTH 5
  48
  49/*
  50 * If a replacement for object oid has been set up, return the
  51 * replacement object's name (replaced recursively, if necessary).
  52 * The return value is either oid or a pointer to a
  53 * permanently-allocated value.  This function always respects replace
  54 * references, regardless of the value of check_replace_refs.
  55 */
  56const struct object_id *do_lookup_replace_object(struct repository *r,
  57                                                 const struct object_id *oid)
  58{
  59        int depth = MAXREPLACEDEPTH;
  60        const struct object_id *cur = oid;
  61
  62        prepare_replace_object(r);
  63
  64        /* Try to recursively replace the object */
  65        while (depth-- > 0) {
  66                struct replace_object *repl_obj =
  67                        oidmap_get(r->objects->replace_map, cur);
  68                if (!repl_obj)
  69                        return cur;
  70                cur = &repl_obj->replacement;
  71        }
  72        die("replace depth too high for object %s", oid_to_hex(oid));
  73}