1 files changed, 59 insertions, 0 deletions
diff --git a/toolchains/emulator/toolchain.bzl b/toolchains/emulator/toolchain.bzl
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+++ b/toolchains/emulator/toolchain.bzl
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+# Copyright 2019 The Bazel Authors. All rights reserved.
+#
+# 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.
+
+"""Defines the emulator_toolchain rule to allow configuring emulator binaries to use."""
+
+EmulatorInfo = provider(
+    doc = "Information used to launch a specific version of the emulator.",
+    fields = {
+        "emulator": "A label for the emulator launcher executable at stable version.",
+        "emulator_deps": "Additional files required to launch the stable version of emulator.",
+        "emulator_suffix": "An optional path suffix used to find emulator binary under the emulator label path",
+    },
+)
+
+def _emulator_toolchain_impl(ctx):
+    toolchain_info = platform_common.ToolchainInfo(
+        info = EmulatorInfo(
+            emulator = ctx.attr.emulator,
+            emulator_deps = ctx.attr.emulator_deps,
+            emulator_suffix = ctx.attr.emulator_suffix,
+        ),
+    )
+    return [toolchain_info]
+
+emulator_toolchain = rule(
+    implementation = _emulator_toolchain_impl,
+    attrs = {
+        "emulator": attr.label(
+            allow_files = True,
+            cfg = "exec",
+            mandatory = True,
+        ),
+        "emulator_deps": attr.label_list(
+            allow_files = True,
+            cfg = "exec",
+        ),
+        "emulator_head": attr.label(
+            allow_files = True,
+            cfg = "exec",
+        ),
+        "emulator_head_deps": attr.label_list(
+            allow_files = True,
+            cfg = "exec",
+        ),
+        "emulator_suffix": attr.string(default = ""),
+        "emulator_head_suffix": attr.string(default = ""),
+    },
+)