Use Fuchsia directory rust crates

Fuchsia no longer uses a separate directory for third party rust crates.
This change symlinks rust_crates to the equivalent directory in a
Fuchsia root.

Change-Id: I7e12f0232225f098d5ca2d3a4a560e2ecf49a8a6

.cargo/config

diff --git a/.cargo/config b/.cargo/config
index 92a7f2f..a46a6d2 100644
--- a/.cargo/config
+++ b/.cargo/config
@@ -6,5 +6,5 @@
 replace-with = "vendored-sources"
 
 [source.vendored-sources]
-directory = "rust-crates/rustc_deps/vendor"
+directory = "rust_crates/vendor"
 

.gitignore

diff --git a/.gitignore b/.gitignore
index 3a1a183..0303cb3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+Cargo.lock
 target
 out
-rust-crates
\ No newline at end of file
+rust_crates

Cargo.toml

diff --git a/Cargo.toml b/Cargo.toml
index c405a33..55f6868 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,9 +12,9 @@
 edition = "2018"
 
 [dependencies]
-structopt = { path = "rust-crates/rustc_deps/vendor/structopt" }
-libc = { path = "rust-crates/rustc_deps/vendor/libc" }
+structopt = { path = "rust_crates/vendor/structopt" }
+libc = { path = "rust_crates/vendor/libc" }
 
 [patch.crates-io]
-winapi = { path = "rust-crates/rustc_deps/tiny_mirrors/winapi" }
-winapi-util = { path = "rust-crates/rustc_deps/tiny_mirrors/winapi-util" }
+winapi = { path = "rust_crates/tiny_mirrors/winapi" }
+winapi-util = { path = "rust_crates/tiny_mirrors/winapi-util" }

build.sh

diff --git a/build.sh b/build.sh
index 68ba5aa..0c1b203 100755
--- a/build.sh
+++ b/build.sh
@@ -7,10 +7,20 @@
 set -eo pipefail
 
 usage() {
-  echo "usage: ${0} {arm64, x64}"
+  echo "usage: ${0} [options] {arm64, x64}"
+  echo
+  echo "  -f [fuchsia-dir] Fuchsia directory (required)"
+  echo
   exit 1
 }
 
+while getopts "f:" OPT; do
+  case $OPT in
+  f) FUCHSIA_DIR="${OPTARG}";;
+  esac
+done
+shift $((OPTIND - 1))
+
 case "${1}" in
 arm64)
   ARCH="arm64"
@@ -25,12 +35,13 @@
 declare -r OUT_DIR="out/${ARCH}"
 declare -r IMAGE_FILE="out/linux-tests-${ARCH}.img"
 
-if [ ! -d "rust-crates" ]; then
-  git clone "https://fuchsia.googlesource.com/third_party/rust-crates"
-else
-  pushd "rust-crates"
-  git pull
-  popd
+if [ ! -d "rust_crates" ]; then
+  if [ ! -d "${FUCHSIA_DIR}" ]; then
+    echo "Must specifiy Fuchsia directory on first run."
+    usage
+  fi
+
+  ln -s ${FUCHSIA_DIR}/third_party/rust_crates/ rust_crates
 fi
 
 cargo build --target=${TARGET}