test: conftest: require_programs() automatically (MR 2483)

Pmbootstrap finds all its host dependencies during init, ensure we do
that for pytest too.

Adapt require_programs() to use subprocess directly rather than have to
solve the weird dependency chain of pmb.helpers.run which depends on the
global context being initialised before it's usable.

Signed-off-by: Caleb Connolly <caleb@postmarketos.org>

.gitlab-ci.yml

@@ -33,7 +33,7 @@ codespell:
 pytest:
   stage: test
   script:
-    - "apk -q add git android-tools"
+    - "apk -q add git android-tools multipath-tools losetup"
     - "su build -c 'git config --global user.email ci@ci'"
     - "su build -c 'git config --global user.name CI'"
     - "echo 'build ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers"

pmb/config/init.py

@@ -32,6 +32,7 @@ import pmb.chroot.zap
 import pmb.parse.deviceinfo
 from pmb.parse.deviceinfo import Deviceinfo
 import pmb.parse._apkbuild
+import subprocess
 
 
 def require_programs() -> None:
@@ -50,11 +51,16 @@ def require_programs() -> None:
     if "losetup" not in missing:
         # Check if losetup supports the --json argument. Use the absolute path
         # here, so it works in Debian too without using sudo.
+        # FIXME: we use subprocess directly here since pmb.helpers.run.user() requires
+        # global context to be initialized but we want this to run early in pytest.
         try:
-            pmb.helpers.run.user(
+            subprocess.run(
-                [pmb.config.required_programs["losetup"], "--json"], check=True, output="null"
+                [pmb.config.required_programs["losetup"], "--json"],
+                stdout=subprocess.DEVNULL,
+                stderr=subprocess.DEVNULL,
+                check=True,
             )
-        except RuntimeError:
+        except subprocess.CalledProcessError:
             losetup_missing_json = True
 
     error_message = ""

pmb/conftest.py

@@ -52,6 +52,13 @@ def device_package(config_file):
     return pkgdir
 
 
+@pytest.fixture(autouse=True)
+def find_required_programs():
+    """Fixture to find required programs for pmbootstrap."""
+
+    pmb.config.require_programs()
+
+
 @pytest.fixture
 def mock_devices_find_path(device_package, monkeypatch):
     """Fixture to mock pmb.helpers.devices.find_path()"""