From f431cd1a48a6a5186633bf5f16a2d21cb4399e8c Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Thu, 09 Feb 2012 10:56:43 -0500
Subject: Initial commit.

TODO: Copyright information.
Including source code and a patch to add files generated by GNU Autoconf
is not very pretty...  Running 'make dist' in the SVN trunk to generate
a source archive might be better.
---
(limited to 'src/libopkg/opkg_upgrade.c')

diff --git a/src/libopkg/opkg_upgrade.c b/src/libopkg/opkg_upgrade.c
new file mode 100644
index 0000000..10b8217
--- /dev/null
+++ b/src/libopkg/opkg_upgrade.c
@@ -0,0 +1,130 @@
+/* opkg_upgrade.c - the opkg package management system
+
+   Carl D. Worth
+   Copyright (C) 2001 University of Southern California
+
+   Copyright (C) 2003 Daniele Nicolodi <daniele@grinta.net>
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "opkg_install.h"
+#include "opkg_upgrade.h"
+#include "opkg_message.h"
+
+int
+opkg_upgrade_pkg(pkg_t *old)
+{
+     pkg_t *new;
+     int cmp;
+     char *old_version, *new_version;
+
+     if (old->state_flag & SF_HOLD) {
+          opkg_msg(NOTICE, "Not upgrading package %s which is marked "
+                       "hold (flags=%#x).\n", old->name, old->state_flag);
+          return 0;
+     }
+
+     new = pkg_hash_fetch_best_installation_candidate_by_name(old->name);
+     if (new == NULL) {
+          old_version = pkg_version_str_alloc(old);
+          opkg_msg(NOTICE, "Assuming locally installed package %s (%s) "
+                       "is up to date.\n", old->name, old_version);
+          free(old_version);
+          return 0;
+     }
+
+     old_version = pkg_version_str_alloc(old);
+     new_version = pkg_version_str_alloc(new);
+
+     cmp = pkg_compare_versions(old, new);
+     opkg_msg(DEBUG, "Comparing visible versions of pkg %s:"
+                  "\n\t%s is installed "
+                  "\n\t%s is available "
+                  "\n\t%d was comparison result\n",
+                  old->name, old_version, new_version, cmp);
+     if (cmp == 0) {
+          opkg_msg(INFO, "Package %s (%s) installed in %s is up to date.\n",
+                       old->name, old_version, old->dest->name);
+          free(old_version);
+          free(new_version);
+          return 0;
+     } else if (cmp > 0) {
+          opkg_msg(NOTICE, "Not downgrading package %s on %s from %s to %s.\n",
+                       old->name, old->dest->name, old_version, new_version);
+          free(old_version);
+          free(new_version);
+          return 0;
+     } else if (cmp < 0) {
+          new->dest = old->dest;
+          old->state_want = SW_DEINSTALL;
+     }
+
+    free(old_version);
+    free(new_version);
+    new->state_flag |= SF_USER;
+    return opkg_install_pkg(new,1);
+}
+
+
+static void
+pkg_hash_check_installed_pkg_helper(const char *pkg_name, void *entry,
+		void *data)
+{
+	struct active_list *head = (struct active_list *) data;
+	abstract_pkg_t *ab_pkg = (abstract_pkg_t *)entry;
+	pkg_vec_t *pkg_vec = ab_pkg->pkgs;
+	int j;
+
+	if (!pkg_vec)
+		return;
+
+	for (j = 0; j < pkg_vec->len; j++) {
+		pkg_t *pkg = pkg_vec->pkgs[j];
+		if (pkg->state_status == SS_INSTALLED
+				|| pkg->state_status == SS_UNPACKED)
+			active_list_add(head, &pkg->list);
+	}
+}
+
+struct active_list *
+prepare_upgrade_list(void)
+{
+    struct active_list *head = active_list_head_new();
+    struct active_list *all = active_list_head_new();
+    struct active_list *node=NULL;
+
+    /* ensure all data is valid */
+    pkg_info_preinstall_check();
+
+    hash_table_foreach(&conf->pkg_hash, pkg_hash_check_installed_pkg_helper, all);
+    for (node=active_list_next(all,all); node; node = active_list_next(all, node)) {
+        pkg_t *old, *new;
+        int cmp;
+
+        old = list_entry(node, pkg_t, list);
+        new = pkg_hash_fetch_best_installation_candidate_by_name(old->name);
+
+        if (new == NULL)
+            continue;
+
+        cmp = pkg_compare_versions(old, new);
+
+        if ( cmp < 0 ) {
+           node = active_list_move_node(all, head, &old->list);
+        }
+    }
+    active_list_head_delete(all);
+    return head;
+}
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