deps: be verbose when installing snaps

Otherwise things might look like they're hanging.

mir-ci/mir_ci/conftest.py

@@ -3,6 +3,7 @@
 import pathlib
 import shutil
 import subprocess
+import time
 import warnings
 from collections.abc import Iterator
 from typing import Any, Generator, List, Mapping, Optional, Union
@@ -104,7 +105,14 @@ def _deps_install(request: pytest.FixtureRequest, spec: Union[str, Mapping[str,
                     subprocess.check_call(("snap", "list", snap), stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
                 except subprocess.CalledProcessError:
                     _classic = ("--classic",) if classic else ()
-                    subprocess.check_call(("sudo", "snap", "install", snap, "--channel", channel, *_classic))
+                    subprocess.check_call(
+                        ("sudo", "snap", "install", "--no-wait", snap, "--channel", channel, *_classic)
+                    )
+                    while (output := subprocess.check_output(("snap", "changes"), text=True)) and "Doing" in output:
+                        for line in output.splitlines():
+                            if "Doing" in line:
+                                print(line)
+                                time.sleep(30)
                     if shutil.which(f"/snap/{snap}/current/bin/setup.sh"):
                         subprocess.check_call(("sudo", f"/snap/{snap}/current/bin/setup.sh"))
                     subprocess.call(