This removes direct access of the 'BUILD_DIR' variable.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 tests/functional/qemu_test/cmd.py      |  5 ++---
 tests/functional/qemu_test/testcase.py |  4 ++--
 tests/functional/test_aarch64_virt.py  |  5 ++---
 tests/functional/test_virtio_gpu.py    | 11 +++--------
 4 files changed, 9 insertions(+), 16 deletions(-)

diff --git a/tests/functional/qemu_test/cmd.py b/tests/functional/qemu_test/cmd.py
index bebcd46dcf..c8971de00a 100644
--- a/tests/functional/qemu_test/cmd.py
+++ b/tests/functional/qemu_test/cmd.py
@@ -16,7 +16,6 @@
 import os.path
 import subprocess
 
-from .config import BUILD_DIR
 
 def which(tool):
     """ looks up the full path for @tool, returns None if not found
@@ -205,10 +204,10 @@ def get_qemu_img(test):
 
     # If qemu-img has been built, use it, otherwise the system wide one
     # will be used.
-    qemu_img = os.path.join(BUILD_DIR, 'qemu-img')
+    qemu_img = test.build_file('qemu-img')
     if os.path.exists(qemu_img):
         return qemu_img
     qemu_img = which('qemu-img')
     if qemu_img is not None:
         return qemu_img
-    test.skipTest(f"qemu-img not found in {BUILD_DIR} or '$PATH'")
+    test.skipTest(f"qemu-img not found in build dir or '$PATH'")
diff --git a/tests/functional/qemu_test/testcase.py b/tests/functional/qemu_test/testcase.py
index 2174fbb155..493938240c 100644
--- a/tests/functional/qemu_test/testcase.py
+++ b/tests/functional/qemu_test/testcase.py
@@ -133,8 +133,8 @@ def setUp(self, bin_prefix):
         self.arch = self.qemu_bin.split('-')[-1]
         self.socketdir = None
 
-        self.outputdir = os.path.join(BUILD_DIR, 'tests', 'functional',
-                                      self.arch, self.id())
+        self.outputdir = self.build_file('tests', 'functional',
+                                         self.arch, self.id())
         self.workdir = os.path.join(self.outputdir, 'scratch')
         os.makedirs(self.workdir, exist_ok=True)
 
diff --git a/tests/functional/test_aarch64_virt.py b/tests/functional/test_aarch64_virt.py
index c967da41b4..5bc461b482 100755
--- a/tests/functional/test_aarch64_virt.py
+++ b/tests/functional/test_aarch64_virt.py
@@ -14,7 +14,6 @@
 import os
 import logging
 
-from qemu_test import BUILD_DIR
 from qemu_test import QemuSystemTest, Asset
 from qemu_test import exec_command, wait_for_console_pattern
 from qemu_test import get_qemu_img, run_cmd
@@ -54,8 +53,8 @@ def test_alpine_virt_tcg_gic_max(self):
                          "mte=on,"
                          "gic-version=max,iommu=smmuv3")
         self.vm.add_args("-smp", "2", "-m", "1024")
-        self.vm.add_args('-bios', os.path.join(BUILD_DIR, 'pc-bios',
-                                               'edk2-aarch64-code.fd'))
+        self.vm.add_args('-bios', self.build_file('pc-bios',
+                                                  'edk2-aarch64-code.fd'))
         self.vm.add_args("-drive", f"file={iso_path},media=cdrom,format=raw")
         self.vm.add_args('-device', 'virtio-rng-pci,rng=rng0')
         self.vm.add_args('-object', 'rng-random,id=rng0,filename=/dev/urandom')
diff --git a/tests/functional/test_virtio_gpu.py b/tests/functional/test_virtio_gpu.py
index 7654421e6b..81c9156d63 100755
--- a/tests/functional/test_virtio_gpu.py
+++ b/tests/functional/test_virtio_gpu.py
@@ -6,7 +6,6 @@
 # later.  See the COPYING file in the top-level directory.
 
 
-from qemu_test import BUILD_DIR
 from qemu_test import QemuSystemTest, Asset
 from qemu_test import wait_for_console_pattern
 from qemu_test import exec_command_and_wait_for_pattern
@@ -18,12 +17,8 @@
 import subprocess
 
 
-def pick_default_vug_bin():
-    relative_path = "./contrib/vhost-user-gpu/vhost-user-gpu"
-    if is_readable_executable_file(relative_path):
-        return relative_path
-
-    bld_dir_path = os.path.join(BUILD_DIR, relative_path)
+def pick_default_vug_bin(test):
+    bld_dir_path = test.build_file("contrib", "vhost-user-gpu", "vhost-user-gpu")
     if is_readable_executable_file(bld_dir_path):
         return bld_dir_path
 
@@ -86,7 +81,7 @@ def test_vhost_user_vga_virgl(self):
         # FIXME: should check presence of vhost-user-gpu, virgl, memfd etc
         self.require_accelerator('kvm')
 
-        vug = pick_default_vug_bin()
+        vug = pick_default_vug_bin(self)
         if not vug:
             self.skipTest("Could not find vhost-user-gpu")
 
-- 
2.46.0