test_upgrade_compatibility: initial CI

Contributes to https://gitlab.com/postmarketOS/pmaports/-/issues/1432

test_upgrade_compatibility.py

+#!/usr/bin/env python3
+# Copyright 2022 Dylan Van Assche
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+import sys
+import glob
+import os
+import pytest
+
+import pmb.helpers.logging
+import pmb.parse.apkindex
+import pmb.parse
+
+
+@pytest.fixture
+def args(request):
+    # Initialize args
+    sys.argv = ["pmbootstrap", "chroot"]
+    args = pmb.parse.arguments()
+
+    # Initialize logging
+    pmb.helpers.logging.init(args)
+    request.addfinalizer(pmb.helpers.logging.logfd.close)
+    return args
+
+
+def test_latest_stable_to_edge(args):
+    """
+    Verify if we can upgrade from the latest stable image to edge.
+    """
+    POSTMARKETOS_VERSION="21.12"
+    ALPINE_VERSION="3.15"
+
+    # Switch to latest stable in chroot
+    if pmb.helpers.run.user(args, ["git", "checkout", "v" + POSTMARKETOS_VERSION],
+                            args.aports, "interactive", check=False):
+        raise RuntimeError("Failed to switch branch. Go to your pmaports and"
+                           " fix what git complained about, then try again: "
+                           f"{args.aports}")
+    pmb.helpers.other.init_cache()
+
+    # Clear chroot
+    pmb.chroot.zap(args, confirm=False)
+    
+    # Edit repositories to switch to edge
+    # FIXME: This sed command doesn't affect the actual repositories list 
+    pmb.chroot.root(args, ["sed", "-i", "-e", "s/v" + POSTMARKETOS_VERSION + "/master/g", "/etc/apk/repositories"])
+    pmb.chroot.root(args, ["sed", "-i", "-e", "s/v" + ALPINE_VERSION + "/edge/g", "/etc/apk/repositories"])
+
+    # Perform upgrade
+    pmb.chroot.root(args, ["apk", "upgrade", "-a"])