runtime/rust: add BUILD files for Rust crates

Add BUILD files for the oak_abi and oak_runtime crates, mirroring
the dependencies from Cargo.toml into "//cargo:<dep>" equivalents
in the BUILD file.

Check that `bazel build //oak/server/rust/oak_abi` and
`bazel build //oak/server/rust/oak_run` work afterwards.

oak/server/rust/oak_abi/BUILD

@@ -0,0 +1,33 @@
+#
+# Copyright 2019 The Project Oak Authors
+#
+# 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.
+#
+
+load("@io_bazel_rules_rust//rust:rust.bzl", "rust_library")
+
+package(
+    default_visibility = ["//oak/server:__subpackages__"],
+    licenses = ["notice"],
+)
+
+rust_library(
+    name = "oak_abi",
+    srcs = glob(["src/**/*.rs"]),
+    crate_type = "rlib",
+    edition = "2018",
+    deps = [
+        "//cargo:hashbrown",
+        "//cargo:prost",
+    ],
+)

oak/server/rust/oak_abi/Cargo.toml

@@ -6,6 +6,9 @@ edition = "2018"
 license = "Apache-2.0"
 
 [dependencies]
+# Note that if new dependencies are added here:
+#  - they need to be synced to //cargo/Cargo.toml
+#  - `cd cargo && cargo raze` needs re-running, and the results checked in
 prost = "*"
 hashbrown = "*"
 

oak/server/rust/oak_runtime/BUILD

@@ -0,0 +1,38 @@
+#
+# Copyright 2019 The Project Oak Authors
+#
+# 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.
+#
+
+load("@io_bazel_rules_rust//rust:rust.bzl", "rust_library")
+
+package(
+    default_visibility = ["//oak/server:__subpackages__"],
+    licenses = ["notice"],
+)
+
+rust_library(
+    name = "oak_runtime",
+    srcs = glob(["src/**/*.rs"]),
+    crate_type = "rlib",
+    edition = "2018",
+    deps = [
+        "//cargo:byteorder",
+        "//cargo:itertools",
+        "//cargo:log",
+        "//cargo:prost",
+        "//cargo:rand",
+        "//cargo:wasmi",
+        "//oak/server/rust/oak_abi",
+    ],
+)

oak/server/rust/oak_runtime/Cargo.toml

@@ -13,6 +13,9 @@ test_build = []
 default = []
 
 [dependencies]
+# Note that if new dependencies are added here:
+#  - they need to be synced to //cargo/Cargo.toml
+#  - `cd cargo && cargo raze` needs re-running, and the results checked in
 byteorder = { version = "*", default-features = false }
 itertools = "*"
 log = { version = "*" }