Merge pull request #19 from getditto/dhm/stable-toolchain

1.57.0 release

config.sh

@@ -3,13 +3,27 @@
 # returned by the command below:
 # $ xcrun -sdk iphoneos swiftc --version
 
+set -euxo pipefail
+
+RUST_TOOLCHAIN="1.57.0"
+
 LLVM_BRANCH="swift-5.3.2-RELEASE"
 
+get_rust_commit_for_toolchain() (
+    # Yields "" for a toolchain like `x.y.z`, and `mm-dd-yy` for `nightly-mm-dd-yy`
+    IF_NIGHTLY_DATE_STRIPPED=$(echo "${RUST_TOOLCHAIN}" | sed -n 's/^nightly-//p')
+    if [ -n "${IF_NIGHTLY_DATE_STRIPPED}" ]; then
+        curl "https://static.rust-lang.org/dist/${IF_NIGHTLY_DATE_STRIPPED}/channel-rust-nightly-git-commit-hash.txt"
+    else
+        echo "refs/tags/${RUST_TOOLCHAIN}"
+    fi
+)
+
 # 2. Select the best branch, tag or commit hash from https://github.com/rust-lang/rust
 
-RUST_BRANCH="003d8d3f56848b6f3833340e859b089a09aea36a" # 2021-10-05
+RUST_BRANCH="$(get_rust_commit_for_toolchain)"
 
 # 3. Select a name for the toolchain you want to install as. The toolchain will be installed
 # under $HOME/.rustup/toolchains/rust-$RUST_TOOLCHAIN
 
-RUST_TOOLCHAIN="ios-arm64-nightly-2021-10-05"
+RUST_TOOLCHAIN="ios-arm64-${RUST_TOOLCHAIN}"