[PATCH 16/22] Acceptance Tests: introduce method for requiring an accelerator

[Cleber Rosa]

Some tests explicitly require a QEMU accelerator to be available.
Given that this depends on some runtime aspects not known before
the test is started, such as the currently set QEMU binary, it's
left to be checked also at runtime.

Signed-off-by: Cleber Rosa <crosa@redhat.com>
---
 tests/acceptance/avocado_qemu/__init__.py | 24 ++++++++++++++++
 tests/acceptance/boot_linux.py            | 34 ++++++-----------------
 tests/acceptance/virtiofs_submounts.py    |  5 +---
 3 files changed, 34 insertions(+), 29 deletions(-)

diff --git a/tests/acceptance/avocado_qemu/__init__.py 
b/tests/acceptance/avocado_qemu/__init__.py
index f0649e5011..472088ae7d 100644
--- a/tests/acceptance/avocado_qemu/__init__.py
+++ b/tests/acceptance/avocado_qemu/__init__.py
@@ -41,6 +41,8 @@ else:
 
 sys.path.append(os.path.join(SOURCE_DIR, 'python'))
 
+from qemu.accel import kvm_available
+from qemu.accel import tcg_available
 from qemu.machine import QEMUMachine
 from qemu.utils import get_info_usernet_hostfwd_port
 
@@ -166,6 +168,28 @@ class Test(avocado.Test):
             return vals.pop()
         return None
 
+    def require_accelerator(self, accelerator):
+        """
+        Requires an accelerator to be available for the test to continue
+
+        It takes into account the currently set qemu binary.
+
+        If the check fails, the test is canceled.  If the check itself
+        for the given accelerator is not available, the test is also
+        canceled.
+
+        :param accelerator: name of the accelerator, such as "kvm" or "tcg"
+        :type accelerator: str
+        """
+        checker = {'tcg': tcg_available,
+                   'kvm': kvm_available}.get(accelerator)
+        if checker is None:
+            self.cancel("Don't know how to check for the presence "
+                        "of accelerator %s" % accelerator)
+        if not checker(qemu_bin=self.qemu_bin):
+            self.cancel("%s accelerator does not seem to be "
+                        "available" % accelerator)
+
     def setUp(self):
         self._vms = {}
 
diff --git a/tests/acceptance/boot_linux.py b/tests/acceptance/boot_linux.py
index 14e89d020d..0d178038a0 100644
--- a/tests/acceptance/boot_linux.py
+++ b/tests/acceptance/boot_linux.py
@@ -12,15 +12,8 @@ import os
 
 from avocado_qemu import LinuxTest, BUILD_DIR
 
-from qemu.accel import kvm_available
-from qemu.accel import tcg_available
-
 from avocado import skipIf
 
-ACCEL_NOT_AVAILABLE_FMT = "%s accelerator does not seem to be available"
-KVM_NOT_AVAILABLE = ACCEL_NOT_AVAILABLE_FMT % "KVM"
-TCG_NOT_AVAILABLE = ACCEL_NOT_AVAILABLE_FMT % "TCG"
-
 
 class BootLinuxX8664(LinuxTest):
     """
@@ -34,8 +27,7 @@ class BootLinuxX8664(LinuxTest):
         :avocado: tags=machine:pc
         :avocado: tags=accel:tcg
         """
-        if not tcg_available(self.qemu_bin):
-            self.cancel(TCG_NOT_AVAILABLE)
+        self.require_accelerator("tcg")
         self.vm.add_args("-accel", "tcg")
         self.launch_and_wait()
 
@@ -44,8 +36,7 @@ class BootLinuxX8664(LinuxTest):
         :avocado: tags=machine:pc
         :avocado: tags=accel:kvm
         """
-        if not kvm_available(self.arch, self.qemu_bin):
-            self.cancel(KVM_NOT_AVAILABLE)
+        self.require_accelerator("kvm")
         self.vm.add_args("-accel", "kvm")
         self.launch_and_wait()
 
@@ -54,8 +45,7 @@ class BootLinuxX8664(LinuxTest):
         :avocado: tags=machine:q35
         :avocado: tags=accel:tcg
         """
-        if not tcg_available(self.qemu_bin):
-            self.cancel(TCG_NOT_AVAILABLE)
+        self.require_accelerator("tcg")
         self.vm.add_args("-accel", "tcg")
         self.launch_and_wait()
 
@@ -64,8 +54,7 @@ class BootLinuxX8664(LinuxTest):
         :avocado: tags=machine:q35
         :avocado: tags=accel:kvm
         """
-        if not kvm_available(self.arch, self.qemu_bin):
-            self.cancel(KVM_NOT_AVAILABLE)
+        self.require_accelerator("kvm")
         self.vm.add_args("-accel", "kvm")
         self.launch_and_wait()
 
@@ -91,8 +80,7 @@ class BootLinuxAarch64(LinuxTest):
         :avocado: tags=accel:tcg
         :avocado: tags=cpu:max
         """
-        if not tcg_available(self.qemu_bin):
-            self.cancel(TCG_NOT_AVAILABLE)
+        self.require_accelerator("tcg")
         self.vm.add_args("-accel", "tcg")
         self.vm.add_args("-cpu", "max")
         self.vm.add_args("-machine", "virt,gic-version=2")
@@ -105,8 +93,7 @@ class BootLinuxAarch64(LinuxTest):
         :avocado: tags=cpu:host
         :avocado: tags=device:gicv2
         """
-        if not kvm_available(self.arch, self.qemu_bin):
-            self.cancel(KVM_NOT_AVAILABLE)
+        self.require_accelerator("kvm")
         self.vm.add_args("-accel", "kvm")
         self.vm.add_args("-cpu", "host")
         self.vm.add_args("-machine", "virt,gic-version=2")
@@ -119,8 +106,7 @@ class BootLinuxAarch64(LinuxTest):
         :avocado: tags=cpu:host
         :avocado: tags=device:gicv3
         """
-        if not kvm_available(self.arch, self.qemu_bin):
-            self.cancel(KVM_NOT_AVAILABLE)
+        self.require_accelerator("kvm")
         self.vm.add_args("-accel", "kvm")
         self.vm.add_args("-cpu", "host")
         self.vm.add_args("-machine", "virt,gic-version=3")
@@ -140,8 +126,7 @@ class BootLinuxPPC64(LinuxTest):
         :avocado: tags=machine:pseries
         :avocado: tags=accel:tcg
         """
-        if not tcg_available(self.qemu_bin):
-            self.cancel(TCG_NOT_AVAILABLE)
+        self.require_accelerator("tcg")
         self.vm.add_args("-accel", "tcg")
         self.launch_and_wait()
 
@@ -159,7 +144,6 @@ class BootLinuxS390X(LinuxTest):
         :avocado: tags=machine:s390-ccw-virtio
         :avocado: tags=accel:tcg
         """
-        if not tcg_available(self.qemu_bin):
-            self.cancel(TCG_NOT_AVAILABLE)
+        self.require_accelerator("tcg")
         self.vm.add_args("-accel", "tcg")
         self.launch_and_wait()
diff --git a/tests/acceptance/virtiofs_submounts.py 
b/tests/acceptance/virtiofs_submounts.py
index d0fc103f72..0298807e5c 100644
--- a/tests/acceptance/virtiofs_submounts.py
+++ b/tests/acceptance/virtiofs_submounts.py
@@ -9,8 +9,6 @@ from avocado_qemu import LinuxTest, BUILD_DIR
 from avocado_qemu import wait_for_console_pattern
 from avocado.utils import ssh
 
-from qemu.accel import kvm_available
-
 
 def run_cmd(args):
     subp = subprocess.Popen(args,
@@ -201,8 +199,7 @@ class VirtiofsSubmountsTest(LinuxTest):
         self.vm.add_args('-netdev', 'user,id=vnet,hostfwd=:127.0.0.1:0-:22',
                          '-device', 'virtio-net,netdev=vnet')
 
-        if not kvm_available(self.arch, self.qemu_bin):
-            self.cancel(KVM_NOT_AVAILABLE)
+        self.require_accelerator("kvm")
         self.vm.add_args('-accel', 'kvm')
 
     def tearDown(self):
-- 
2.25.4