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src/subversion/subversion/libsvn_fs_base/bdb/changes-table.c  view on Meta::CPAN

              old_change->change_kind = svn_fs_path_change_delete;
              old_change->text_mod = change->text_mod;
              old_change->prop_mod = change->prop_mod;
            }
          break;

        case svn_fs_path_change_add:
        case svn_fs_path_change_replace:
          /* An add at this point must be following a previous delete,
             so treat it just like a replace. */
          old_change->change_kind = svn_fs_path_change_replace;
          old_change->node_rev_id = svn_fs_base__id_copy(change->noderev_id,
                                                         pool);
          old_change->text_mod = change->text_mod;
          old_change->prop_mod = change->prop_mod;
          break;

        case svn_fs_path_change_modify:
        default:
          if (change->text_mod)
            old_change->text_mod = TRUE;
          if (change->prop_mod)
            old_change->prop_mod = TRUE;
          break;
        }

      /* Point our new_change to our (possibly modified) old_change. */
      new_change = old_change;
    }
  else
    {
      /* This change is new to the hash, so make a new public change
         structure from the internal one (in the hash's pool), and dup
         the path into the hash's pool, too. */
      new_change = svn_fs__path_change_create_internal(
                       svn_fs_base__id_copy(change->noderev_id, pool),
                       change->kind,
                       pool);
      new_change->text_mod = change->text_mod;
      new_change->prop_mod = change->prop_mod;
      new_change->node_kind = svn_node_unknown;
      new_change->copyfrom_known = FALSE;
      path = apr_pstrdup(pool, change->path);
    }

  /* Add (or update) this path. */
  svn_hash_sets(changes, path, new_change);

  return SVN_NO_ERROR;
}


svn_error_t *
svn_fs_bdb__changes_fetch(apr_hash_t **changes_p,
                          svn_fs_t *fs,
                          const char *key,
                          trail_t *trail,
                          apr_pool_t *pool)
{
  base_fs_data_t *bfd = fs->fsap_data;
  DBC *cursor;
  DBT query, result;
  int db_err = 0, db_c_err = 0;
  svn_error_t *err = SVN_NO_ERROR;
  apr_hash_t *changes = apr_hash_make(pool);
  apr_pool_t *subpool = svn_pool_create(pool);

  /* Get a cursor on the first record matching KEY, and then loop over
     the records, adding them to the return array. */
  svn_fs_base__trail_debug(trail, "changes", "cursor");
  SVN_ERR(BDB_WRAP(fs, N_("creating cursor for reading changes"),
                   bfd->changes->cursor(bfd->changes, trail->db_txn,
                                        &cursor, 0)));

  /* Advance the cursor to the key that we're looking for. */
  svn_fs_base__str_to_dbt(&query, key);
  svn_fs_base__result_dbt(&result);
  db_err = svn_bdb_dbc_get(cursor, &query, &result, DB_SET);
  if (! db_err)
    svn_fs_base__track_dbt(&result, pool);

  while (! db_err)
    {
      change_t *change;
      svn_skel_t *result_skel;

      /* Clear the per-iteration subpool. */
      svn_pool_clear(subpool);

      /* RESULT now contains a change record associated with KEY.  We
         need to parse that skel into an change_t structure ...  */
      result_skel = svn_skel__parse(result.data, result.size, subpool);
      if (! result_skel)
        {
          err = svn_error_createf(SVN_ERR_FS_CORRUPT, NULL,
                                  _("Error reading changes for key '%s'"),
                                  key);
          goto cleanup;
        }
      err = svn_fs_base__parse_change_skel(&change, result_skel, subpool);
      if (err)
        goto cleanup;

      /* ... and merge it with our return hash.  */
      err = fold_change(changes, change);
      if (err)
        goto cleanup;

      /* Now, if our change was a deletion or replacement, we have to
         blow away any changes thus far on paths that are (or, were)
         children of this path.
         ### i won't bother with another iteration pool here -- at
             most we talking about a few extra dups of paths into what
             is already a temporary subpool.
      */
      if ((change->kind == svn_fs_path_change_delete)
          || (change->kind == svn_fs_path_change_replace))
        {
          apr_hash_index_t *hi;

          for (hi = apr_hash_first(subpool, changes);
               hi;
               hi = apr_hash_next(hi))
            {
              /* KEY is the path. */
              const void *hashkey;
              apr_ssize_t klen;
              const char *child_relpath;

              apr_hash_this(hi, &hashkey, &klen, NULL);

              /* If we come across our own path, ignore it.
                 If we come across a child of our path, remove it. */
              child_relpath = svn_fspath__skip_ancestor(change->path, hashkey);
              if (child_relpath && *child_relpath)
                apr_hash_set(changes, hashkey, klen, NULL);
            }
        }

      /* Advance the cursor to the next record with this same KEY, and
         fetch that record. */
      svn_fs_base__result_dbt(&result);
      db_err = svn_bdb_dbc_get(cursor, &query, &result, DB_NEXT_DUP);
      if (! db_err)
        svn_fs_base__track_dbt(&result, pool);
    }

  /* Destroy the per-iteration subpool. */
  svn_pool_destroy(subpool);

  /* If there are no (more) change records for this KEY, we're
     finished.  Just return the (possibly empty) array.  Any other
     error, however, needs to get handled appropriately.  */
  if (db_err && (db_err != DB_NOTFOUND))
    err = BDB_WRAP(fs, N_("fetching changes"), db_err);

 cleanup:
  /* Close the cursor. */
  db_c_err = svn_bdb_dbc_close(cursor);

  /* If we had an error prior to closing the cursor, return the error. */
  if (err)
    return svn_error_trace(err);

  /* If our only error thus far was when we closed the cursor, return
     that error. */
  if (db_c_err)
    SVN_ERR(BDB_WRAP(fs, N_("closing changes cursor"), db_c_err));

  /* Finally, set our return variable and get outta here. */
  *changes_p = changes;
  return SVN_NO_ERROR;
}


svn_error_t *
svn_fs_bdb__changes_fetch_raw(apr_array_header_t **changes_p,
                              svn_fs_t *fs,
                              const char *key,
                              trail_t *trail,
                              apr_pool_t *pool)
{
  base_fs_data_t *bfd = fs->fsap_data;
  DBC *cursor;
  DBT query, result;
  int db_err = 0, db_c_err = 0;
  svn_error_t *err = SVN_NO_ERROR;
  change_t *change;
  apr_array_header_t *changes = apr_array_make(pool, 4, sizeof(change));

  /* Get a cursor on the first record matching KEY, and then loop over
     the records, adding them to the return array. */
  svn_fs_base__trail_debug(trail, "changes", "cursor");
  SVN_ERR(BDB_WRAP(fs, N_("creating cursor for reading changes"),
                   bfd->changes->cursor(bfd->changes, trail->db_txn,
                                        &cursor, 0)));

  /* Advance the cursor to the key that we're looking for. */
  svn_fs_base__str_to_dbt(&query, key);
  svn_fs_base__result_dbt(&result);
  db_err = svn_bdb_dbc_get(cursor, &query, &result, DB_SET);
  if (! db_err)
    svn_fs_base__track_dbt(&result, pool);

  while (! db_err)
    {
      svn_skel_t *result_skel;

      /* RESULT now contains a change record associated with KEY.  We
         need to parse that skel into an change_t structure ...  */
      result_skel = svn_skel__parse(result.data, result.size, pool);
      if (! result_skel)
        {
          err = svn_error_createf(SVN_ERR_FS_CORRUPT, NULL,
                                  _("Error reading changes for key '%s'"),
                                  key);
          goto cleanup;
        }
      err = svn_fs_base__parse_change_skel(&change, result_skel, pool);
      if (err)
        goto cleanup;

      /* ... and add it to our return array.  */
      APR_ARRAY_PUSH(changes, change_t *) = change;

      /* Advance the cursor to the next record with this same KEY, and
         fetch that record. */
      svn_fs_base__result_dbt(&result);
      db_err = svn_bdb_dbc_get(cursor, &query, &result, DB_NEXT_DUP);
      if (! db_err)
        svn_fs_base__track_dbt(&result, pool);
    }

  /* If there are no (more) change records for this KEY, we're
     finished.  Just return the (possibly empty) array.  Any other
     error, however, needs to get handled appropriately.  */
  if (db_err && (db_err != DB_NOTFOUND))
    err = BDB_WRAP(fs, N_("fetching changes"), db_err);

 cleanup:
  /* Close the cursor. */
  db_c_err = svn_bdb_dbc_close(cursor);

  /* If we had an error prior to closing the cursor, return the error. */
  if (err)
    return svn_error_trace(err);

  /* If our only error thus far was when we closed the cursor, return
     that error. */
  if (db_c_err)
    SVN_ERR(BDB_WRAP(fs, N_("closing changes cursor"), db_c_err));

  /* Finally, set our return variable and get outta here. */
  *changes_p = changes;
  return SVN_NO_ERROR;
}