db, solver: refuse committing changes if there is missing tags

src/apk_database.h

@@ -130,6 +130,7 @@ struct apk_database {
 	unsigned int local_repos;
 	int performing_self_update : 1;
 	int permanent : 1;
+	int missing_tags : 1;
 	int compat_newfeatures : 1;
 	int compat_notinstallable : 1;
 

src/database.c

@@ -1135,7 +1135,7 @@ int apk_db_open(struct apk_database *db, struct apk_db_options *dbopts)
 	struct apk_bstream *bs;
 	struct statfs stfs;
 	apk_blob_t blob;
-	int r, fd, rr = 0;
+	int i, r, fd, rr = 0;
 
 	memset(db, 0, sizeof(*db));
 	if (apk_flags & APK_SIMULATE) {
@@ -1312,6 +1312,14 @@ int apk_db_open(struct apk_database *db, struct apk_db_options *dbopts)
 		goto ret_r;
 	}
 
+	for (i = 0; i < db->num_repo_tags; i++) {
+		if (!db->repo_tags[i].allowed_repos) {
+			apk_warning("Repository tag '" BLOB_FMT "' used in world is no longer available",
+				    BLOB_PRINTF(*db->repo_tags[i].name));
+			db->missing_tags = 1;
+		}
+	}
+
 	if (db->compat_newfeatures) {
 		apk_warning("This apk-tools is OLD! Some packages %s.",
 			    db->compat_notinstallable ?

src/solver.c

@@ -1261,6 +1261,11 @@ int apk_solver_commit_changeset(struct apk_database *db,
 	struct apk_change *change;
 	int i, r = 0, size_diff = 0;
 
+	if (db->missing_tags && !(apk_flags & APK_FORCE)) {
+		apk_error("Not committing changes due to missing repository tags. Use --force to override.");
+		return -1;
+	}
+
 	if (changeset->changes == NULL)
 		goto all_done;
 
@@ -1406,6 +1411,11 @@ int apk_solver_commit(struct apk_database *db,
 	struct apk_package_array *solution = NULL;
 	int r;
 
+	if (db->missing_tags && !(apk_flags & APK_FORCE)) {
+		apk_error("Not committing changes due to missing repository tags. Use --force to override.");
+		return -1;
+	}
+
 	r = apk_solver_solve(db, solver_flags,
 			     world, &solution, &changeset);
 	if (r < 0)