upgrade: perform upgrade of apk-tools first if available

Also re-exec's apk-tools to perform rest of the upgrade using
the new apk-tools. This allows handling of new apk-tools features
properly. Fixes #140.

src/apk.c

@@ -30,6 +30,8 @@
 #include "apk_blob.h"
 #include "apk_print.h"
 
+char **apk_argv;
+
 static struct apk_option generic_options[] = {
 	{ 'h', "help",		"Show generic help or applet specific help" },
 	{ 'p', "root",		"Install packages to DIR",
@@ -245,6 +247,10 @@ int main(int argc, char **argv)
 	struct apk_database db;
 	struct apk_db_options dbopts;
 
+	apk_argv = malloc(sizeof(char*[argc+1]));
+	memcpy(apk_argv, argv, sizeof(char*[argc]));
+	apk_argv[argc] = NULL;
+
 	memset(&dbopts, 0, sizeof(dbopts));
 	list_init(&dbopts.repository_list);
 	apk_atom_init();

src/apk_defines.h

@@ -50,6 +50,7 @@
 extern int apk_verbosity;
 extern unsigned int apk_flags;
 extern const char *apk_arch;
+extern char **apk_argv;
 
 #define APK_FORCE		0x0001
 #define APK_SIMULATE		0x0002

src/apk_state.h

@@ -23,7 +23,8 @@ struct apk_change {
 };
 
 struct apk_state {
-	unsigned int refs, num_names;
+	unsigned int refs, num_names, num_changes;
+	int print_ok;
 	struct apk_database *db;
 	struct list_head change_list_head;
 	struct apk_package_array *conflicts;

src/state.c

@@ -199,6 +199,7 @@ struct apk_state *apk_state_new(struct apk_database *db)
 	state->refs = 1;
 	state->num_names = db->name_id;
 	state->db = db;
+	state->print_ok = 1;
 	list_init(&state->change_list_head);
 
 	apk_name_array_init(&state->missing);
@@ -235,6 +236,7 @@ static int apk_state_add_change(struct apk_state *state,
 
 	list_init(&change->change_list);
 	list_add_tail(&change->change_list, &state->change_list_head);
+	state->num_changes++;
 	change->oldpkg = oldpkg;
 	change->newpkg = newpkg;
 
@@ -873,13 +875,11 @@ int apk_state_commit(struct apk_state *state,
 {
 	struct progress prog;
 	struct apk_change *change;
-	int r = 0, size_diff = 0, toplevel = FALSE, deleteonly = TRUE;
-	int n = 0, numpkg = 0;
+	int n = 0, r = 0, size_diff = 0, toplevel = FALSE, deleteonly = TRUE;
 
 	/* Count what needs to be done */
 	memset(&prog, 0, sizeof(prog));
 	list_for_each_entry(change, &state->change_list_head, change_list) {
-		numpkg++;
 		if (change->newpkg == NULL) {
 			if (change->oldpkg->name->flags & APK_NAME_TOPLEVEL)
 				toplevel = TRUE;
@@ -935,7 +935,7 @@ int apk_state_commit(struct apk_state *state,
 	n = 0;
 	list_for_each_entry(change, &state->change_list_head, change_list) {
 		n++;
-		apk_print_change(db, change->oldpkg, change->newpkg, n, numpkg);
+		apk_print_change(db, change->oldpkg, change->newpkg, n, state->num_changes);
 		prog.pkg = change->newpkg;
 
 		if (!(apk_flags & APK_SIMULATE)) {
@@ -963,7 +963,7 @@ update_state:
 	apk_db_run_triggers(db);
 	apk_db_write_config(db);
 
-	if (r == 0)
+	if (r == 0 && state->print_ok)
 		apk_message("OK: %d packages, %d dirs, %d files",
 			    db->installed.stats.packages,
 			    db->installed.stats.dirs,

src/upgrade.c

@@ -30,6 +30,46 @@ static int upgrade_parse(void *ctx, struct apk_db_options *dbopts,
 	return 0;
 }
 
+int apk_do_self_upgrade(struct apk_database *db, struct apk_state *state)
+{
+	struct apk_dependency dep;
+	int r, i;
+
+	apk_dep_from_blob(&dep, db, APK_BLOB_STR("apk-tools"));
+
+	if (apk_flags & APK_PREFER_AVAILABLE) {
+		for (i = 0; i < db->world->num; i++) {
+			struct apk_dependency *dep0 = &db->world->item[i];
+			if (dep0->name != dep.name)
+				continue;
+			dep0->version = apk_blob_atomize(APK_BLOB_NULL);
+			dep0->result_mask = APK_VERSION_EQUAL | APK_VERSION_LESS | APK_VERSION_GREATER;
+			break;
+		}
+	}
+
+	r = apk_state_lock_dependency(state, &dep);
+	if (r != 0 || state->num_changes == 0)
+		return r;
+
+	if (apk_flags & APK_SIMULATE) {
+		apk_warning("This simulation is not reliable as apk-tools upgrade is available.");
+		return 0;
+	}
+
+	apk_message("Uprading first to new apk-tools:");
+	state->print_ok = 0;
+	r = apk_state_commit(state, db);
+	apk_state_unref(state);
+	apk_db_close(db);
+
+	apk_message("Performing rest of the operation:");
+	execvp(apk_argv[0], apk_argv);
+
+	apk_error("PANIC! Failed to re-execute new apk-tools!");
+	exit(1);
+}
+
 static int upgrade_main(void *ctx, struct apk_database *db, int argc, char **argv)
 {
 	struct apk_state *state = NULL;
@@ -38,12 +78,18 @@ static int upgrade_main(void *ctx, struct apk_database *db, int argc, char **arg
 	int i, r = 0;
 
 	apk_flags |= APK_UPGRADE;
-
 	apk_name_array_init(&missing);
+
 	state = apk_state_new(db);
 	if (state == NULL)
 		goto err;
 
+	r = apk_do_self_upgrade(db, state);
+	if (r != 0) {
+		apk_state_print_errors(state);
+		goto err;
+	}
+
 	for (i = 0; i < db->world->num; i++) {
 		struct apk_dependency *dep = &db->world->item[i];
 		if (dep->version != null_atom &&