ci: add option to use a different Firecracker binary

.buildkite/common.py

@@ -159,3 +159,10 @@ def __call__(self, parser, namespace, value, option_string=None):
     default={},
     type=str,
 )
+COMMON_PARSER.add_argument(
+    "--binary-dir",
+    help="Use the Firecracker binaries from this path",
+    required=False,
+    default=None,
+    type=str,
+)

.buildkite/pipeline_pr.py

@@ -41,6 +41,18 @@
 defaults_once_per_architecture["platforms"] = [("al2", "linux_5.10")]
 
 
+def devtool_test(cmd, binary_dir=None):
+    cmds = []
+    parts = ["./tools/devtool -y test --"]
+    if binary_dir is not None:
+        cmds.append(f"buildkite-agent artifact download \"{binary_dir}/$(uname -m)/*\" .")
+        cmds.append(f"chmod -v a+x {binary_dir}/**/*")
+        parts.append(f"--binary-dir=../{binary_dir}/$(uname -m)")
+    parts.append(cmd)
+    cmds.append(" ".join(parts))
+    return cmds
+
+
 devctr_grp = group(
     "🐋 Dev Container Sanity Build",
     "./tools/devtool -y build_devctr",
@@ -61,7 +73,7 @@
 
 functional_grp = group(
     "⚙ Functional and security 🔒",
-    "./tools/devtool -y test -- -n 8 --dist worksteal integration_tests/{{functional,security}}",
+    devtool_test("-n 8 --dist worksteal integration_tests/{{functional,security}}", args.binary_dir),
     **defaults,
 )
 

tests/conftest.py

@@ -288,6 +288,8 @@ def microvm_factory(fc_tmp_path, bin_cloner_path, request):
     if binary_dir := request.config.getoption("--binary-dir"):
         fc_binary_path = Path(binary_dir) / "firecracker"
         jailer_binary_path = Path(binary_dir) / "jailer"
+        if not fc_binary_path.exists():
+            raise RuntimeError("Firecracker binary does not exist")
     else:
         fc_binary_path, jailer_binary_path = build_tools.get_firecracker_binaries()