WIP: use arch tags on test setup

Not defaulting to os.uname() to set a default arch, checking for valid
archs based on the tags, and finally setting a default arch if one and
only one arch is given as a tag.

Signed-off-by: Cleber Rosa <crosa@redhat.com>

tests/acceptance/avocado_qemu/__init__.py

@@ -52,8 +52,20 @@ def pick_default_qemu_bin(arch=None):
 
 class Test(avocado.Test):
     def setUp(self):
-        self.vm = None
-        self.arch = self.params.get('arch', default=os.uname()[4])
+        arches = [tag.split(':', 1)[1] for tag in self.tags if tag.startswith('arch:')]
+
+        # Do not set a default arch based on the host - see discussion on qemu-devel
+        self.arch = self.params.get('arch', None)
+
+        # If a arch parameter is *not* given, and one, and only one "arch:" tag is
+        # given, default to that
+        if self.arch is None and len(arches) == 1:
+            self.arch = arches[0]
+
+        # If arch is still not set, cancel the test
+        if self.arch not in arches:
+            self.cancel('Currently specific to the targets: %s' % ", ".join(arches))
+
         self.qemu_bin = self.params.get('qemu_bin',
                                         default=pick_default_qemu_bin(self.arch))
         if self.qemu_bin is None:

tests/acceptance/boot_linux_console.py

@@ -25,8 +25,9 @@ class BootLinuxConsole(Test):
     timeout = 60
 
     def test_x86_64_pc(self):
-        if self.arch != 'x86_64':
-            self.cancel('Currently specific to the x86_64 arch')
+        """
+        :avocado: tags=arch:x86_64
+        """
         kernel_url = ('https://mirrors.kernel.org/fedora/releases/28/'
                       'Everything/x86_64/os/images/pxeboot/vmlinuz')
         kernel_hash = '238e083e114c48200f80d889f7e32eeb2793e02a'
@@ -62,9 +63,6 @@ def test_mips_4kc_malta(self):
 
         :avocado: tags=arch:mips
         """
-        if self.arch != 'mips': # FIXME use 'arch' tag in parent class?
-            self.cancel('Currently specific to the %s target arch' % self.arch)
-
         deb_url = ('http://snapshot.debian.org/archive/debian/20130217T032700Z/'
                    'pool/main/l/linux-2.6/'
                    'linux-image-2.6.32-5-4kc-malta_2.6.32-48_mips.deb')