install bazel directly instead of using the installer script

bazel team isn't publishing any new installer scripts: bazelbuild/bazel#11775

.buildkite/build-static-release.sh

@@ -24,7 +24,7 @@ fi
 
 echo will run with $CONFIG_OPTS
 
-./bazel build //main:sorbet --strip=always $CONFIG_OPTS
+./bazel build //main:sorbet --strip=always $CONFIG_OPTS --toolchain_resolution_debug=@bazel_tools//tools/cpp:toolchain_type
 
 mkdir gems/sorbet-static/libexec/
 cp bazel-bin/main/sorbet gems/sorbet-static/libexec/

WORKSPACE

@@ -87,10 +87,12 @@ load("@build_bazel_rules_nodejs//:index.bzl", "node_repositories")
 
 node_repositories()
 
-BAZEL_VERSION = "5.0.0"
+BAZEL_VERSION = "4.2.1"
 
-BAZEL_INSTALLER_VERSION_LINUX_X86_64_SHA = "42cfb37d2834d075996b9d02698674be7f322f0acd864b17c3191301329845f9"
+BAZEL_VERSION_LINUX_X86_64_SHA = "1a4f3a3ce292307bceeb44f459883859c793436d564b95319aacb8af1f20557c"
 
-BAZEL_INSTALLER_VERSION_DARWIN_X86_64_SHA = "f7e8d1eac85ec125c430f9553e35d522c057895262956201ccea8a27d87054cc"
+BAZEL_VERSION_LINUX_ARM64_SHA = "0a849f99d59eab7058212a89b2a0d2b6a17f1ef7ba7fb7a42523a7171bb1c64f"
 
-BAZEL_INSTALLER_VERSION_DARWIN_ARM64_SHA = "785900dfadb14b20db4edc76019cd1c9048c4216ed8052c34e72816b7ed358e9"
+BAZEL_VERSION_DARWIN_X86_64_SHA = "74d93848f0c9d592e341e48341c53c87e3cb304a54a2a1ee9cff3df422f0b23c"
+
+BAZEL_VERSION_DARWIN_ARM64_SHA = "f0375d77afe61a7167cd6d9cda1fde0eb29839e0ca8718002da73ea895b31dc0"

bazel

@@ -52,23 +52,26 @@ echo >&2 "No cached Bazel v$BAZEL_VERSION found, installing..."
 kernel_name="$(uname -s | tr 'A-Z' 'a-z')"
 processor_name="$(uname -m)"
 
-bazel_installer_platform="${kernel_name}-${processor_name}"
-case "$bazel_installer_platform" in
+bazel_platform="${kernel_name}-${processor_name}"
+case "$bazel_platform" in
   linux-x86_64) ;;
+  linux-aarch64)
+    bazel_platform="linux-arm64"
+    ;;
   darwin-x86_64) ;;
   darwin-arm64)
     # Pseudo Apple Silicon support by forcing x86_64 (Rosetta) for now
-    bazel_installer_platform="darwin-x86_64"
+    bazel_platform="darwin-x86_64"
     ;;
   *)
-    echo >&2 "Building on $bazel_installer_platform is not implemented"
+    echo >&2 "Building on $bazel_platform is not implemented"
     exit 1
     ;;
 esac
 
-bazel_installer_platform_var="$(echo "$bazel_installer_platform" | tr 'a-z-' 'A-Z_')"
-bazel_installer_sha_regex="BAZEL_INSTALLER_VERSION_${bazel_installer_platform_var}_SHA = \"([^\"]+)\""
-if [[ $workspace_contents =~ $bazel_installer_sha_regex ]]; then
+bazel_platform_var="$(echo "$bazel_platform" | tr 'a-z-' 'A-Z_')"
+bazel_sha_regex="BAZEL_VERSION_${bazel_platform_var}_SHA = \"([^\"]+)\""
+if [[ $workspace_contents =~ $bazel_sha_regex ]]; then
   export expected_sha="${BASH_REMATCH[1]}"
 else
   echo >&2 "$0: Failed to extract Bazel version from WORKSPACE"
@@ -84,13 +87,13 @@ mkdir -p "$BUILD_DIR"
   cd "$BUILD_DIR"
   echo "$PWD"
 
-  installer_name="bazel-${BAZEL_VERSION}-installer-${bazel_installer_platform}.sh"
+  name="bazel-${BAZEL_VERSION}-${bazel_platform}"
   BAZEL_REMOTE_SOURCE="${BAZEL_REMOTE_SOURCE:-https://github.com/bazelbuild/bazel/releases/download}"
-  BAZEL_INSTALLER_PATH="${BAZEL_INSTALLER_PATH:-$BAZEL_REMOTE_SOURCE/${BAZEL_VERSION}/$installer_name}"
+  BAZEL_PATH="${BAZEL_PATH:-$BAZEL_REMOTE_SOURCE/${BAZEL_VERSION}/$name}"
 
-  curl -O -L "$BAZEL_INSTALLER_PATH"
+  curl -O -L "$BAZEL_PATH"
 
-  actual_sha="$(shasum -a 256 "$installer_name" | awk '{print $1}')"
+  actual_sha="$(shasum -a 256 "$name" | awk '{print $1}')"
   if [ "$actual_sha" != "$expected_sha" ]; then
     echo >&2 "Installer checksum mismatch:"
     echo >&2 "  Expected: $expected_sha"
@@ -99,9 +102,10 @@ mkdir -p "$BUILD_DIR"
     exit 1
   fi
 
-  chmod +x "$installer_name"
+  chmod +x "$name"
   mkdir -p "$bazel_bin_loc"
-  "./${installer_name}" --base="${bazel_bin_loc}/${BAZEL_VERSION}" --bin="${bazel_bin_loc}/${BAZEL_VERSION}/bin_t"
+  mkdir -p "$(dirname "$bazel_exec_path")"
+  mv "$name" "$bazel_exec_path"
 )
 rm -rf "$BUILD_DIR"