Merge "tools: add convenience script for repackaging demangling sources from llvm-project"
diff --git a/tools/repackage_llvm_demangler.sh b/tools/repackage_llvm_demangler.sh
new file mode 100644
index 0000000..54081d5
--- /dev/null
+++ b/tools/repackage_llvm_demangler.sh
@@ -0,0 +1,57 @@
+#!/bin/bash
+# Copyright (C) 2022 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -eu
+
+# For perfetto maintainers. Pulls out demangling-related sources out of
+# llvm-project and repackages them as a single tar archive. This works around
+# the fact that gitiles, when generating an on-demand archive, uses a current
+# timestamp, so the hash of the archive is different every time you fetch.
+
+# Usage example:
+# sh tools/repackage_llvm_demangler.sh 3b4c59c156919902c785ce3cbae0eee2ee53064d
+#
+# Then upload the tar with "gsutil cp -n -a public-read ... gs://perfetto/...",
+# and update install-build-deps.
+
+GIT_REF=$1
+
+WORK_DIR=$(mktemp -d)
+pushd . && cd "${WORK_DIR}"
+
+CC_DIR="llvm-project/llvm/lib/Demangle"
+H_DIR="llvm-project/llvm/include/llvm/Demangle"
+
+CC_TGZ="Demangle_lib.tgz"
+H_TGZ="Demangle_include.tgz"
+
+curl -f -L -# "https://llvm.googlesource.com/llvm-project/+archive/${GIT_REF}/llvm/lib/Demangle.tar.gz" -o "${CC_TGZ}"
+curl -f -L -# "https://llvm.googlesource.com/llvm-project/+archive/${GIT_REF}/llvm/include/llvm/Demangle.tar.gz" -o "${H_TGZ}"
+
+mkdir -p "${CC_DIR}"
+mkdir -p "${H_DIR}"
+
+tar xf "${CC_TGZ}" -C "${CC_DIR}"
+tar xf "${H_TGZ}" -C "${H_DIR}"
+
+TAR_NAME="llvm-project-${GIT_REF}.tgz"
+tar czf "${TAR_NAME}" --sort=name --owner=root:0 --group=root:0 --mtime='UTC 2019-01-01' llvm-project
+
+TAR_SHA=$(sha256sum "${TAR_NAME}")
+
+echo "output file: ${WORK_DIR}/${TAR_NAME}"
+echo "contents sha256: ${TAR_SHA}"
+
+popd
