support/testing: add s6-rc tests

Test that s6-rc service database compilation is working.

Signed-off-by: Dick Olsson <hi@senzilla.io>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
[Arnout: indent config lines more]

support/testing/tests/package/test_s6_rc.py

@@ -0,0 +1,47 @@
+import os
+
+import infra.basetest
+
+
+class TestS6Rc(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_S6_RC=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def test_run(self):
+        img = os.path.join(self.builddir, "images", "rootfs.cpio")
+        self.emulator.boot(arch="armv5",
+                           kernel="builtin",
+                           options=["-initrd", img])
+        self.emulator.login()
+
+        _, exit_code = self.emulator.run("s6-svscan -h")
+        self.assertEqual(exit_code, 100)
+
+        # Set up two service directories with a dependency
+        self.emulator.run("mkdir -p source/testsv1")
+        self.emulator.run("mkdir -p source/testsv2")
+        self.emulator.run("echo oneshot > source/testsv1/type")
+        self.emulator.run("echo oneshot > source/testsv2/type")
+        self.emulator.run("echo 'echo foo' > source/testsv1/up")
+        self.emulator.run("echo 'echo bar' > source/testsv2/up")
+        self.emulator.run("echo testsv1 > source/testsv2/dependencies")
+        self.emulator.run("chmod +x source/testsv1/up")
+        self.emulator.run("chmod +x source/testsv2/up")
+
+        # Compile the service database
+        _, exit_code = self.emulator.run("s6-rc-compile compiled source")
+        self.assertEqual(exit_code, 0)
+
+        # Inspect dependencies
+        cmd = "s6-rc-db -c compiled -d dependencies testsv1"
+        output, exit_code = self.emulator.run(cmd)
+        self.assertEqual(exit_code, 0)
+        self.assertEqual(output[0], "testsv2")
+        cmd = "s6-rc-db -c compiled dependencies testsv2"
+        output, exit_code = self.emulator.run(cmd)
+        self.assertEqual(exit_code, 0)
+        self.assertEqual(output[0], "testsv1")