upgrade: new applet

Currently just goes through all world dependencies and updates them
where possible (ref #51).

src/Makefile

@@ -2,7 +2,7 @@ progs-y			+= apk
 apk-objs		:= state.o database.o package.o archive.o \
 			   version.o io.o url.o gunzip.o blob.o \
 			   hash.o md5.o apk.o \
-			   add.o del.o update.o info.o search.o \
+			   add.o del.o update.o info.o search.o upgrade.o \
 			   ver.o index.o fetch.o audit.o
 CFLAGS_apk.o		:= -DAPK_VERSION=\"$(FULL_VERSION)\"
 

src/upgrade.c

@@ -0,0 +1,55 @@
+/* upgrade.c - Alpine Package Keeper (APK)
+ *
+ * Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
+ * Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation. See http://www.gnu.org/ for details.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <zlib.h>
+#include "apk_applet.h"
+#include "apk_database.h"
+#include "apk_state.h"
+
+static int upgrade_main(void *ctx, int argc, char **argv)
+{
+	struct apk_database db;
+	struct apk_state *state = NULL;
+	int i, r;
+
+	apk_flags |= APK_UPGRADE;
+
+	r = apk_db_open(&db, apk_root, APK_OPENF_WRITE);
+	if (r != 0)
+		return r;
+
+	state = apk_state_new(&db);
+	for (i = 0; i < db.world->num; i++) {
+		r = apk_state_lock_dependency(state, &db.world->item[i]);
+		if (r != 0) {
+			apk_error("Unable to upgrade '%s'",
+				  db.world->item[i].name->name);
+			goto err;
+		}
+	}
+	r = apk_state_commit(state, &db);
+err:
+	if (state != NULL)
+		apk_state_unref(state);
+	apk_db_close(&db);
+	return r;
+}
+
+static struct apk_applet apk_upgrade = {
+	.name = "upgrade",
+	.usage = "",
+	.main = upgrade_main,
+};
+
+APK_DEFINE_APPLET(apk_upgrade);
+