Create overarching Cargo workspace

This makes it easier for engineers unfamiliar with the project to see
where all the crates live and prevents lots of nested target/ and
Cargo.lock files from cluttering up the tree.

It's perhaps not as useful as for other projects, since optee-utee still
needs to be built via Xargo, which means "cargo build" from the root
can't build everything. But the other benefits still apply.

I had to rename the "systest" crates inside optee-teec and optee-utee so
their names don't conflict. I also didn't include examples in the
workspace yet, since every example currently has the same three crate
names, meaning multiple can't coexist in one workspace. Also, the
example Makefiles and tests/ scripts hardcode per-example target/ dirs.

If we did add the examples to the workspace, we could build all of them
much faster since they'd share a dependency graph. Doing that is just
out of scope of this commit.

Author: Thomas Hebb

.gitignore

@@ -15,8 +15,7 @@
 # specific language governing permissions and limitations
 # under the License.
 
-/optee-utee/Cargo.lock
-/optee-teec/Cargo.lock
+/Cargo.lock
 /examples/**/proto/Cargo.lock
 *.rs.bk
 .user_ta_header.o.d

Cargo.toml

@@ -0,0 +1,44 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+
+[workspace]
+# The -sys and macros crates would included in the workspace transitively even
+# if not listed, but list them anyway for completeness.
+members = [
+    "optee-teec",
+    "optee-teec/macros",
+    "optee-teec/optee-teec-sys",
+    "optee-teec/systest",
+    "optee-utee",
+    "optee-utee/macros",
+    "optee-utee/optee-utee-sys",
+    "optee-utee/systest",
+]
+
+# Don't try to build crates requiring Xargo on a workspace-level "cargo build",
+# since they'll just fail.
+default-members = [
+    "optee-teec",
+    "optee-teec/systest",
+]
+
+exclude = [
+    # OP-TEE contains no Rust code, but exclude it in case future versions do.
+    "optee",
+    "rust",
+    "examples",
+]

optee-teec/Cargo.toml

@@ -30,6 +30,3 @@ optee-teec-macros = { path = "macros" }
 libc = "0.2"
 uuid = "0.7"
 hex = "0.3"
-
-[workspace]
-members = ['systest']

optee-teec/systest/Cargo.toml

@@ -16,7 +16,7 @@
 # under the License.
 
 [package]
-name = "systest"
+name = "optee-teec-systest"
 version = "0.2.0"
 authors = ["Teaclave Contributors <dev@teaclave.apache.org>"]
 license = "Apache-2.0"

optee-utee/Cargo.toml

@@ -31,6 +31,3 @@ libc = { path = "../rust/libc", version = "=0.2.99" }
 bitflags = "=1.0.4"
 uuid = { version = "0.8", default-features = false }
 hex = "0.3"
-
-[workspace]
-members = ['systest']

optee-utee/systest/Cargo.toml

@@ -16,7 +16,7 @@
 # under the License.
 
 [package]
-name = "systest"
+name = "optee-utee-systest"
 version = "0.2.0"
 authors = ["Teaclave Contributors <dev@teaclave.apache.org>"]
 license = "Apache-2.0"