Add in-kernel test runner
This adds a way to run tests inside the Smalltown kernel.
Improvements to the Bazel part of this are tracked in T726
Test Plan: Tested by intentionally failing the test.
X-Origin-Diff: phab/D485
GitOrigin-RevId: e4aad7f28d122d82a7fcb6699e678cbe022e2f73
diff --git a/core/tools/ktest/ktest.bzl b/core/tools/ktest/ktest.bzl
new file mode 100644
index 0000000..03a7d5c
--- /dev/null
+++ b/core/tools/ktest/ktest.bzl
@@ -0,0 +1,61 @@
+# Copyright 2020 The Monogon Project Authors.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Ktest provides a simple macro to run tests inside the normal Smalltown kernel
+"""
+
+def ktest(deps, tester, initramfs_extra, cmdline):
+ native.genrule(
+ name = "test_initramfs",
+ srcs = [
+ "//core/tools/ktestinit",
+ ] + deps + [tester],
+ outs = [
+ "initramfs.cpio.lz4",
+ ],
+ testonly = True,
+ cmd = """
+ $(location @linux//:gen_init_cpio) - <<- 'EOF' | lz4 -l > \"$@\"
+dir /dev 0755 0 0
+nod /dev/console 0600 0 0 c 5 1
+nod /dev/null 0644 0 0 c 1 3
+file /init $(location //core/tools/ktestinit) 0755 0 0
+file /tester $(location """ + tester + """) 0755 0 0
+""" + initramfs_extra + """
+EOF
+ """,
+ tools = [
+ "@linux//:gen_init_cpio",
+ ],
+ )
+
+ native.sh_test(
+ name = "ktest",
+ args = [
+ "$(location //core/tools/ktest)",
+ "$(location :test_initramfs)",
+ "$(location //core/tools/ktest:linux-testing)",
+ cmdline,
+ ],
+ size = "small",
+ srcs = ["//core/tools/ktest:test-script"],
+ data = [
+ "//core/tools/ktest",
+ ":test_initramfs",
+ "//core/tools/ktest:linux-testing",
+ ],
+ )
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