support/testing: add package/test_mender.py

Create a test to check Mender client at runtime.

The aim of this test is:
  - to check the correct execution of simple Mender commands,
    in a minimal environment;
  - to validate there is no missing dependencies for runtime.

This test is not a board integration test for Mender,
including well-configured bootloader, partitioning, ...

Check:
  - the daemon is started;
  - the current 'artifact name' (name of the image or update) of the active
    partition is read, without error.

For that, we need to fake (see the 'overlay' directory):
  - some bootloader environment variables;
  - the name of an update.

Signed-off-by: Mikael Bourhis-Cloarec <mikael.bourhis@smile.fr>
[Romain: remove single hyphen command (Mender 3.0.0)]
Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/package/test_mender.py

@@ -0,0 +1,32 @@
+import os
+
+import infra.basetest
+
+
+class TestMender(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_MENDER=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        BR2_ROOTFS_OVERLAY="{}"
+        """.format(
+           # overlay to add a fake 'fw_printenv', used by Mender
+           infra.filepath("tests/package/test_mender/rootfs-overlay"))
+
+    def test_run(self):
+        cpio_file = os.path.join(self.builddir, "images", "rootfs.cpio")
+        self.emulator.boot(arch="armv5",
+                           kernel="builtin",
+                           options=["-initrd", cpio_file])
+        self.emulator.login()
+
+        # Check if the Daemon is running
+        self.assertRunOk("ls /var/run/mender.pid")
+        self.assertRunOk("ps aux | egrep [m]ender")
+
+        # Check if a simple Mender command is correctly executed
+        self.assertRunOk("mender -log-level debug show-artifact")
+        self.assertRunOk("mender -log-level debug show-artifact | grep 'RUNTIME_TEST_ARTIFACT_NAME'")
+        cmd = "mender show-artifact 2>&1 | grep -i 'err'"  # Check if no 'error' among the traces
+        _, exit_code = self.emulator.run(cmd)
+        self.assertEqual(exit_code, 1)

support/testing/tests/package/test_mender/rootfs-overlay/etc/mender/artifact_info

@@ -0,0 +1 @@
+artifact_name=RUNTIME_TEST_ARTIFACT_NAME

support/testing/tests/package/test_mender/rootfs-overlay/usr/bin/fw_printenv

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# Fake 'fw_printenv' because UBoot is not installed: print some plausible 'key-value'
+echo "bootcount=0"
+echo "mender_boot_part=rootfs"
+echo "upgrade_available=0"