add test for upgrade

Add a basic test to check that systemd works after an upgrade

mkosi/mkosi.conf.d/centos-fedora/mkosi.prepare

@@ -0,0 +1,24 @@
+#!/bin/bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+set -e
+
+if [[ "$1" == "build" ]]; then
+    exit 0
+fi
+
+# Get the systemd version installed in the host assuming it's recent enough
+# but a major version older than the one in the image.
+if dnf --version |grep -q '^4\.'; then
+    disable='--disablerepo'
+elif dnf --version |grep -q '^dnf5\s'; then
+    disable='--disable-repo'
+else
+    echo 'Unknown dnf version!'
+    exit 1
+fi
+
+curver=$(dnf repoquery "$disable" mkosi --latest-limit=1 --queryformat='%{evr}' systemd)
+pkgs=$(dnf repoquery 'systemd*' |grep -F "$curver" |grep -v -e -debuginfo -e -debugsource)
+pkgdir=/usr/host-pkgs
+
+dnf download --arch noarch --arch "$DISTRIBUTION_ARCHITECTURE" --destdir "$BUILDROOT$pkgdir" $pkgs

test/integration-tests/TEST-88-UPGRADE/meson.build

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+integration_tests += [
+        integration_test_template + {
+                'name' : fs.name(meson.current_source_dir()),
+        },
+]

test/integration-tests/meson.build

@@ -96,6 +96,7 @@ foreach dirname : [
         'TEST-85-NETWORK',
         'TEST-86-MULTI-PROFILE-UKI',
         'TEST-87-AUX-UTILS-VM',
+        'TEST-88-UPGRADE',
 ]
         subdir(dirname)
 endforeach

test/units/TEST-88-UPGRADE.sh

@@ -0,0 +1,53 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+set -eux
+set -o pipefail
+
+pkgdir=/usr/host-pkgs
+
+if ! [ -d "$pkgdir" ]; then
+    echo "Distro packages not found in $pkgdir" >/skipped
+    exit 77
+fi
+
+minor=$(systemctl --version |awk '/^systemd/{print$2}')
+if which networkctl >/dev/null; then
+    networkd=1
+fi
+
+if dnf --version |grep -q '^4\.'; then
+    disable='--disablerepo'
+elif dnf --version |grep -q '^dnf5\s'; then
+    disable='--disable-repo'
+else
+    echo 'Unknown dnf version!'
+    exit 1
+fi
+
+dnf downgrade -y --allowerasing "$disable" '*' "$pkgdir"/*.rpm
+
+newminor=$(systemctl --version |awk '/^systemd/{print$2}')
+
+if [ "$newminor" -lt "$minor" ]; then
+    echo "Downgrade to $newminor was successful."
+else
+    echo "Downgrade failed. Current version is still $newminor."
+    exit 1
+fi
+
+# TODO: sanity checks
+
+systemctl --failed |grep -Fqx '0 loaded units listed.'
+[ -n "$networkd" ] && networkctl status
+loginctl list-sessions
+
+# Finally test the upgrade
+dnf -y upgrade $disable '*' "$PACKAGEDIR"/*.rpm
+
+# TODO: sanity checks
+
+systemctl --failed |grep -Fqx '0 loaded units listed.'
+[ -n "$networkd" ] && networkctl status
+loginctl list-sessions