Install .swift-version toolchain on CI

.github/workflows/perf.yml

@@ -16,6 +16,7 @@ jobs:
           export SWIFTENV_ROOT="$HOME/.swiftenv"
           export PATH="$SWIFTENV_ROOT/bin:$PATH"
           eval "$(swiftenv init -)"
+          ./scripts/install-toolchain.sh
           swiftenv install $TOOLCHAIN_DOWNLOAD
           make perf-tester
           node ci/perf-tester

.github/workflows/test.yml

@@ -23,6 +23,7 @@ jobs:
           export SWIFTENV_ROOT="$HOME/.swiftenv"
           export PATH="$SWIFTENV_ROOT/bin:$PATH"
           eval "$(swiftenv init -)"
+          ./scripts/install-toolchain.sh
           swiftenv install $TOOLCHAIN_DOWNLOAD
           make bootstrap
           make test

Makefile

@@ -2,6 +2,7 @@ MAKEFILE_DIR := $(dir $(lastword $(MAKEFILE_LIST)))
 
 .PHONY: bootstrap
 bootstrap:
+	./scripts/install-toolchain.sh
 	npm install
 
 .PHONY: build

scripts/install-toolchain.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+set -eu
+
+scripts_dir="$(cd "$(dirname $0)" && pwd)"
+
+swift_version="$(cat $scripts_dir/../.swift-version)"
+swift_tag="swift-$swift_version"
+
+if [ -z "$(which swiftenv)" ]; then
+  echo "swiftenv not installed, please install it before this script."
+  exit 1
+fi
+
+if [ ! -z "$(swiftenv versions | grep $swift_version)" ]; then
+  echo "$swift_version is already installed."
+  exit 0
+fi
+
+case $(uname -s) in
+  Darwin)
+    toolchain_download="$swift_tag-osx.tar.gz"
+  ;;
+  Linux)
+    if [ $(grep RELEASE /etc/lsb-release) == "DISTRIB_RELEASE=18.04" ]; then
+      toolchain_download="$swift_tag-ubuntu18.04.tar.gz"
+    elif [ $(grep RELEASE /etc/lsb-release) == "DISTRIB_RELEASE=20.04" ]; then
+      toolchain_download="$swift_tag-ubuntu20.04.tar.gz"
+    else
+      echo "Unknown Ubuntu version"
+      exit 1
+    fi
+  ;;
+  *)
+    echo "Unrecognised platform $(uname -s)"
+    exit 1
+  ;;
+esac
+
+toolchain_download_url="https://github.com/swiftwasm/swift/releases/download/$swift_tag/$toolchain_download"
+
+swiftenv install "$toolchain_download_url"