Add bin directory for oak_loader (#1230)

This change adds a binary directory for `oak_loader`.

Fixes #719

.gitignore

@@ -35,8 +35,8 @@
 # Ignore downloaded temporary files, such as the trusted root CA certificates.
 /downloads/
 
-# Ignore generated binary example files
-**/examples/**/bin
+# Ignore generated binary files.
+**/bin/
 
 ### Rust ###
 # Generated by Cargo

scripts/build_server

@@ -32,4 +32,8 @@ Build the specified version of the Oak Runtime server.
   esac
 done
 
-cargo build "${cargo_build_flags[@]}" --manifest-path=oak/server/rust/oak_loader/Cargo.toml
+rm -rf "${SERVER_BIN_DIR:?}"
+mkdir --parents "${SERVER_BIN_DIR}"
+# `--out-dir` is unstable and requires `-Z unstable-options`.
+cargo build "${cargo_build_flags[@]}" --manifest-path=oak/server/rust/oak_loader/Cargo.toml \
+  --out-dir="${SERVER_BIN_DIR}" -Z unstable-options

scripts/common

@@ -15,6 +15,7 @@ readonly DOCKER_IMAGE_NAME='gcr.io/oak-ci/oak'
 readonly SERVER_DOCKER_IMAGE_NAME='gcr.io/oak-ci/oak-server'
 
 readonly CACHE_DIR='bazel-cache'
+readonly SERVER_BIN_DIR="${PWD}/oak/server/bin"
 
 # List all workspaces.
 declare -ar ALL_CRATES=("oak_utils" "oak_abi" "oak/server" "sdk" "examples" "runner" "experimental")

scripts/run_server

@@ -88,6 +88,4 @@ fi
 
 # Launching the server requires a `--application=<dir>/config.bin` flag.
 # `exec` is necessary for the `run_example` script to be able to get a PID of a background server.
-exec cargo run "${cargo_build_flags[@]}" --manifest-path=oak/server/rust/oak_loader/Cargo.toml -- \
-    --application="${APPLICATION_FILE}" \
-    "${additional_args[@]}"
+exec "${SERVER_BIN_DIR}/oak_loader" --application="${APPLICATION_FILE}" "${additional_args[@]}"