Major changes in libxbps to implement caching in some cases.

libxbps:
 - Moved repolist code to lib/repository_pool.c.
 - Renamed xbps_{prepare,release}_repolist_data() to
   xbps_repository_pool_{init,release} respectively.
 - Moved regpkgdb dict code to lib/regpkgs_dictionary.c.
 - Renamed xbps_{prepare,release}_regpkgdb_dict() to
   xbps_regpkgs_dictionary_{init,release} respectively.
 - Use a global reference count for repository_pool and regpkgs_dictionary,
   this gives a substantial performance gain while looking for dependencies
   in repository pool, among other things.
 - Make xbps_find_pkg_* functions return errno and use it to detect
   for spurious errors in code using them.
 - Add code to detect when a dependency is already unpacked.

xbps-bin:
 - Do not set pkg state to unpacked in the transaction, it's set already
   while a package is unpacked.
 - While installing or updating packages, it now knows when a dependency
   is already unpacked and shows it as "unconfigured".

Bump XBPS_RELVER to 20091126.

--HG--
extra : convert_revision : xtraeme%40gmail.com-20091126022250-uu8x0fa86l4scb5x

lib/regpkgs_dictionary.c

@@ -0,0 +1,73 @@
+/*-
+ * Copyright (c) 2008-2009 Juan Romero Pardines.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <xbps_api.h>
+
+static prop_dictionary_t regpkgs_dict;
+static size_t regpkgs_refcount;
+static bool regpkgs_initialized;
+
+prop_dictionary_t SYMEXPORT
+xbps_regpkgs_dictionary_init(void)
+{
+	char *plist;
+
+	if (regpkgs_initialized == false) {
+		plist = xbps_xasprintf("%s/%s/%s", xbps_get_rootdir(),
+		    XBPS_META_PATH, XBPS_REGPKGDB);
+		if (plist == NULL)
+			return NULL;
+
+		regpkgs_dict = prop_dictionary_internalize_from_file(plist);
+		if (regpkgs_dict == NULL) {
+			free(plist);
+			return NULL;
+		}
+		free(plist);
+		regpkgs_initialized = true;
+		DPRINTF(("%s: initialized ok.\n", __func__));
+	}	
+	regpkgs_refcount++;
+
+	return regpkgs_dict;
+}
+
+void SYMEXPORT
+xbps_regpkgs_dictionary_release(void)
+{
+	if (--regpkgs_refcount > 0)
+		return;
+
+	prop_object_release(regpkgs_dict);
+	regpkgs_dict = NULL;
+	regpkgs_initialized = false;
+	DPRINTF(("%s: released ok.\n", __func__));
+}