Currently the centos8 image expects to run an in-src build to find the
kick starter file. Fix this.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 tests/vm/Makefile.include | 1 +
 tests/vm/basevm.py        | 4 ++++
 tests/vm/centos.aarch64   | 2 +-
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/vm/Makefile.include b/tests/vm/Makefile.include
index e94d95ec54..f3a3a1c751 100644
--- a/tests/vm/Makefile.include
+++ b/tests/vm/Makefile.include
@@ -84,6 +84,7 @@ $(IMAGES_DIR)/%.img:	$(SRC_PATH)/tests/vm/% \
 		$(if $(QEMU_LOCAL),--build-path $(BUILD_DIR)) \
 		$(if $(EFI_AARCH64),--efi-aarch64 $(EFI_AARCH64)) \
 		$(if $(LOG_CONSOLE),--log-console) \
+		--source-path $(SRC_PATH) \
 		--image "$@" \
 		--force \
 		--build-image $@, \
diff --git a/tests/vm/basevm.py b/tests/vm/basevm.py
index 00f1d5ca8d..30a417a0e4 100644
--- a/tests/vm/basevm.py
+++ b/tests/vm/basevm.py
@@ -96,6 +96,7 @@ def __init__(self, args, config=None):
         self._genisoimage = args.genisoimage
         self._build_path = args.build_path
         self._efi_aarch64 = args.efi_aarch64
+        self._source_path = args.source_path
         # Allow input config to override defaults.
         self._config = DEFAULT_CONFIG.copy()
         if config != None:
@@ -595,6 +596,9 @@ def get_default_jobs():
     parser.add_argument("--build-path", default=None,
                         help="Path of build directory, "\
                         "for using build tree QEMU binary. ")
+    parser.add_argument("--source-path", default=None,
+                        help="Path of source directory, "\
+                        "for finding additional files. ")
     parser.add_argument("--interactive", "-I", action="store_true",
                         help="Interactively run command")
     parser.add_argument("--snapshot", "-s", action="store_true",
diff --git a/tests/vm/centos.aarch64 b/tests/vm/centos.aarch64
index e687b93e52..81c3004c3c 100755
--- a/tests/vm/centos.aarch64
+++ b/tests/vm/centos.aarch64
@@ -64,7 +64,7 @@ class CentosAarch64VM(basevm.BaseVM):
     def create_kickstart(self):
         """Generate the kickstart file used to generate the centos image."""
         # Start with the template for the kickstart.
-        ks_file = "../tests/vm/centos-8-aarch64.ks"
+        ks_file = self._source_path + "/tests/vm/centos-8-aarch64.ks"
         subprocess.check_call("cp {} ./ks.cfg".format(ks_file), shell=True)
         # Append the ssh keys to the kickstart file
         # as the post processing phase of installation.
-- 
2.20.1