[PATCH v8 1/4] Acceptance tests: introduce BLD_DIR, SRC_DIR and LNK_DIR

[Cleber Rosa <crosa@redhat.com>]

Some tests may benefit from using resources from a build directory.
This introduces three variables that can help tests find resources in
those directories.

First, a BLD_DIR is assumed to exist, given that the primary form of
running the acceptance tests is from a build directory (which may or
may not be the same as the source tree, that is, the SRC_DIR).

If the directory containing the acceptance tests happens to be a link
to a directory (kept as LNK_DIR), it's assumed to it points to the
source tree (SRC_DIR), which is the behavior defined on the QEMU
Makefiles.  If the directory containing the acceptance tests is not a
link, then a in-tree build is assumed, and the BLD_DIR and SRC_DIR are
the same and LNK_DIR is set None.

Signed-off-by: Cleber Rosa <crosa@redhat.com>
---
 tests/acceptance/avocado_qemu/__init__.py | 27 ++++++++++++++++++-----
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/tests/acceptance/avocado_qemu/__init__.py b/tests/acceptance/avocado_qemu/__init__.py
index 6618ea67c1..ac7597f7fe 100644
--- a/tests/acceptance/avocado_qemu/__init__.py
+++ b/tests/acceptance/avocado_qemu/__init__.py
@@ -16,8 +16,23 @@ import tempfile
 
 import avocado
 
-SRC_ROOT_DIR = os.path.join(os.path.dirname(__file__), '..', '..', '..')
-sys.path.append(os.path.join(SRC_ROOT_DIR, 'python'))
+#: The QEMU build root directory.  It may also be the source directory
+#: if building from the source dir, but it's safer to use BLD_DIR for
+#: that purpose.  Be aware that if this code is moved outside of a source
+#: and build tree, it will not be accurate.
+BLD_DIR = os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(__file__))))
+
+if os.path.islink(os.path.dirname(os.path.dirname(__file__))):
+    #: The link to the acceptance tests dir in the source code directory.  If
+    #: build dir is the same as the source dir, this is set to None
+    LNK_DIR = os.path.dirname(os.path.dirname(__file__))
+    #: The QEMU root source directory
+    SRC_DIR = os.path.dirname(os.path.dirname(os.readlink(LNK_DIR)))
+else:
+    LNK_DIR = None
+    SRC_DIR = BLD_DIR
+
+sys.path.append(os.path.join(SRC_DIR, 'python'))
 
 from qemu.machine import QEMUMachine
 
@@ -49,10 +64,10 @@ def pick_default_qemu_bin(arch=None):
     if is_readable_executable_file(qemu_bin_relative_path):
         return qemu_bin_relative_path
 
-    qemu_bin_from_src_dir_path = os.path.join(SRC_ROOT_DIR,
+    qemu_bin_from_bld_dir_path = os.path.join(BLD_DIR,
                                               qemu_bin_relative_path)
-    if is_readable_executable_file(qemu_bin_from_src_dir_path):
-        return qemu_bin_from_src_dir_path
+    if is_readable_executable_file(qemu_bin_from_bld_dir_path):
+        return qemu_bin_from_bld_dir_path
 
 
 def wait_for_console_pattern(test, success_message, failure_message=None):
@@ -122,7 +137,7 @@ class Test(avocado.Test):
         self.qemu_bin = self.params.get('qemu_bin',
                                         default=default_qemu_bin)
         if self.qemu_bin is None:
-            self.cancel("No QEMU binary defined or found in the source tree")
+            self.cancel("No QEMU binary defined or found in the build tree")
 
     def _new_vm(self, *args):
         vm = QEMUMachine(self.qemu_bin, sock_dir=tempfile.mkdtemp())
-- 
2.21.0