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-rwxr-xr-xtools/go_branch.sh115
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diff --git a/tools/go_branch.sh b/tools/go_branch.sh
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--- a/tools/go_branch.sh
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-#!/bin/bash
-
-# Copyright 2019 The gVisor Authors.
-#
-# 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 -xeo pipefail
-
-# Discovery the package name from the go.mod file.
-declare -r module=$(cat go.mod | grep -E "^module" | cut -d' ' -f2)
-declare -r origpwd=$(pwd)
-declare -r othersrc=("go.mod" "go.sum" "AUTHORS" "LICENSE")
-
-# Check that gopath has been built.
-declare -r gopath_dir="$(pwd)/bazel-bin/gopath/src/${module}"
-if ! [ -d "${gopath_dir}" ]; then
- echo "No gopath directory found; build the :gopath target." >&2
- exit 1
-fi
-
-# Create a temporary working directory, and ensure that this directory and all
-# subdirectories are cleaned up upon exit.
-declare -r tmp_dir=$(mktemp -d)
-finish() {
- cd # Leave tmp_dir.
- rm -rf "${tmp_dir}"
-}
-trap finish EXIT
-
-# Record the current working commit.
-declare -r head=$(git describe --always)
-
-# We expect to have an existing go branch that we will use as the basis for this
-# commit. That branch may be empty, but it must exist. We search for this branch
-# using the local branch, the "origin" branch, and other remotes, in order.
-git fetch --all
-declare -r go_branch=$( \
- git show-ref --hash refs/heads/go || \
- git show-ref --hash refs/remotes/origin/go || \
- git show-ref --hash go | head -n 1 \
-)
-
-# Clone the current repository to the temporary directory, and check out the
-# current go_branch directory. We move to the new repository for convenience.
-declare -r repo_orig="$(pwd)"
-declare -r repo_new="${tmp_dir}/repository"
-git clone . "${repo_new}"
-cd "${repo_new}"
-
-# Setup the repository and checkout the branch.
-git config user.email "gvisor-bot@google.com"
-git config user.name "gVisor bot"
-git fetch origin "${go_branch}"
-git checkout -b go "${go_branch}"
-
-# Start working on a merge commit that combines the previous history with the
-# current history. Note that we don't actually want any changes yet.
-#
-# N.B. The git behavior changed at some point and the relevant flag was added
-# to allow for override, so try the only behavior first then pass the flag.
-git merge --no-commit --strategy ours ${head} || \
- git merge --allow-unrelated-histories --no-commit --strategy ours ${head}
-
-# Normalize the permissions on the old branch. Note that they should be
-# normalized if constructed by this tool, but we do so before the rsync.
-find . -type f -exec chmod 0644 {} \;
-find . -type d -exec chmod 0755 {} \;
-
-# Sync the entire gopath_dir.
-rsync --recursive --verbose --delete --exclude .git -L "${gopath_dir}/" .
-
-# Add additional files.
-for file in "${othersrc[@]}"; do
- cp "${origpwd}"/"${file}" .
-done
-
-# Construct a new README.md.
-cat > README.md <<EOF
-# gVisor
-
-This branch is a synthetic branch, containing only Go sources, that is
-compatible with standard Go tools. See the master branch for authoritative
-sources and tests.
-EOF
-
-# There are a few solitary files that can get left behind due to the way bazel
-# constructs the gopath target. Note that we don't find all Go files here
-# because they may correspond to unused templates, etc.
-declare -ar binaries=( "runsc" "shim/v1" "shim/v2" )
-for target in "${binaries[@]}"; do
- mkdir -p "${target}"
- cp "${repo_orig}/${target}"/*.go "${target}/"
-done
-
-# Normalize all permissions. The way bazel constructs the :gopath tree may leave
-# some strange permissions on files. We don't have anything in this tree that
-# should be execution, only the Go source files, README.md, and ${othersrc}.
-find . -type f -exec chmod 0644 {} \;
-find . -type d -exec chmod 0755 {} \;
-
-# Update the current working set and commit.
-git add . && git commit -m "Merge ${head} (automated)"
-
-# Push the branch back to the original repository.
-git remote add orig "${repo_orig}" && git push -f orig go:go