test: Make tests non-destructive

Use recent Cockpit standard test API to handle the directory
restoration.

Clean up/restore user state as well.

Closes #356

Makefile

@@ -162,7 +162,7 @@ bots:
 # checkout Cockpit's test API; this has no API stability guarantee, so check out a stable tag
 # when you start a new project, use the latest release, and update it from time to time
 test/common:
-	git fetch --depth=1 https://github.com/cockpit-project/cockpit.git 210
+	git fetch --depth=1 https://github.com/cockpit-project/cockpit.git 216
 	git checkout --force FETCH_HEAD -- test/common
 	git reset test/common
 

test/check-application

@@ -34,13 +34,18 @@ def checkImage(browser, name, owner):
         return false;
         })""", name, owner)
 
+@testlib.nondestructive
 class TestApplication(testlib.MachineCase):
 
     def setUp(self):
+        super().setUp()
         # backup/restore pristine podman state, so that tests can run on existing testbeds
+        self.restore_dir("/var/lib/containers")
         # HACK: sometimes podman leaks mounts
-        super().setUp()
-        self.machine.execute("cp -a /var/lib/containers /var/lib/containers.orig")
+        self.addCleanup(self.machine.execute, "podman rm --force --all && "
+            "findmnt --list -otarget | grep /var/lib/containers/. | xargs -r umount || true")
+
+        self.machine.execute("systemctl stop io.podman.service; systemctl --now enable io.podman.socket")
 
         # Create admin session
         self.machine.execute("""
@@ -55,13 +60,11 @@ class TestApplication(testlib.MachineCase):
                                                     identity_file=self.machine.identity_file)
 
         # Enable user service as well
-        self.admin_s.execute("systemctl --now --user enable io.podman.socket")
+        self.admin_s.execute("systemctl --user stop io.podman.service; systemctl --now --user enable io.podman.socket")
+        self.restore_dir("/home/admin/.local/share/containers")
+        self.addCleanup(self.admin_s.execute, "podman rm --force --all")
 
         self.allow_journal_messages("/run.*/podman/io.podman: couldn't connect.*")
-        self.addCleanup(self.machine.execute, "podman rm --force --all && "
-            "findmnt --list -otarget | grep /var/lib/containers | xargs -r umount && "
-            "rm -r /var/lib/containers && "
-            "mv /var/lib/containers.orig /var/lib/containers")
 
     def execute(self, system, cmd):
         if system: