support/testing: add runtime testing for init systems

The "builtin" kernel does not boot a systemd-based system, so
we resort to building the same one as currently used by our
qemu_arm_vexpress_defconfig.

We test the 8 following combinations:

  - busybox, read-only, without network
  - busybox, read-only, with network
  - busybox, read-write, without network
  - busybox, read-write, with network

  - basic systemd, read-write, network w/ ifupdown
  - basic systemd, read-write, network w/ networkd
  - full systemd, read-write, network w/ networkd

  - no init system, read-only, without network

The tests just verify what the /sbin/init binary is, and that we were
able to grab an IP address. More tests can be added later, for example
to check each systemd features (journal, tmpfiles...)

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
[Arnout: update .gitlab-ci.yml]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/support/testing/tests/init/test_none.py b/support/testing/tests/init/test_none.py
new file mode 100644
index 0000000000..f55db5d3e0
--- /dev/null
+++ b/support/testing/tests/init/test_none.py
@@ -0,0 +1,32 @@
+import pexpect
+
+import infra.basetest
+from tests.init.base import InitSystemBase as InitSystemBase
+
+class TestInitSystemNone(InitSystemBase):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_INIT_NONE=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        BR2_TARGET_ROOTFS_SQUASHFS=y
+        """
+
+    def test_run(self):
+        self.startEmulator(fs_type="squashfs", init="/bin/sh")
+        index = self.emulator.qemu.expect(["/bin/sh: can't access tty; job control turned off", pexpect.TIMEOUT], timeout=60)
+        if index != 0:
+            self.emulator.logfile.write("==> System does not boot")
+            raise SystemError("System does not boot")
+        index = self.emulator.qemu.expect(["#", pexpect.TIMEOUT], timeout=60)
+        if index != 0:
+            self.emulator.logfile.write("==> System does not boot")
+            raise SystemError("System does not boot")
+
+        out, exit_code = self.emulator.run("sh -c 'echo $PPID'")
+        self.assertEqual(exit_code, 0)
+        self.assertEqual(out[0], "1")
+
+        _, exit_code = self.emulator.run("mount -t proc none /proc")
+        self.assertEqual(exit_code, 0)
+
+        self.checkInit("/bin/sh")