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+#!/bin/bash
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+# Copyright 2018 The Go Authors. All rights reserved.
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+# Use of this source code is governed by a BSD-style
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+# license that can be found in the LICENSE file.
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+
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+REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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+
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+function print() { echo -e "\x1b[1m> $@\x1b[0m"; }
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+
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+# The test directory contains the Go and protobuf toolchains used for testing.
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+# The bin directory contains symlinks to each tool by version.
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+# It is safe to delete this directory and run the test script from scratch.
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+TEST_DIR=$REPO_ROOT/.cache
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+mkdir -p $TEST_DIR/bin
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+function register_binary() {
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+ rm -f $TEST_DIR/bin/$1 # best-effort delete
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+ ln -s $TEST_DIR/$2 $TEST_DIR/bin/$1
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+}
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+export PATH=$TEST_DIR/bin:$PATH
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+cd $TEST_DIR # install toolchains relative to test directory
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+
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+# Download and build the protobuf toolchain.
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+# We avoid downloading the pre-compiled binaries since they do not contain
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+# the conformance test runner.
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+PROTOBUF_VERSION=3.6.1
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+PROTOBUF_DIR="protobuf-$PROTOBUF_VERSION"
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+if [ ! -d $PROTOBUF_DIR ]; then
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+ print "download and build $PROTOBUF_DIR"
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+ (curl -s -L https://github.com/google/protobuf/releases/download/v$PROTOBUF_VERSION/protobuf-all-$PROTOBUF_VERSION.tar.gz | tar -zxf -) || exit 1
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+ (cd $PROTOBUF_DIR && ./configure && make && cd conformance && make) || exit 1
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+fi
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+register_binary conformance-test-runner $PROTOBUF_DIR/conformance/conformance-test-runner
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+register_binary protoc $PROTOBUF_DIR/src/protoc
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+
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+# Download and update the v2 golang/protobuf code.
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+if [ ! -d go-protobuf-v2 ]; then
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+ print "download v2 golang/protobuf"
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+ git clone https://go.googlesource.com/protobuf go-protobuf-v2
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+fi
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+print "update v2 golang/protobuf"
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+(cd go-protobuf-v2 && git fetch && git pull)
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+
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+# Download the Go toolchain.
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+GO_VERSION=go1.11
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+if [ ! -d $GO_VERSION ]; then
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+ print "download $GO_VERSION"
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+ GOOS=$(uname | tr '[:upper:]' '[:lower:]')
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+ (mkdir $GO_VERSION && curl -s -L https://dl.google.com/go/$GO_VERSION.$GOOS-amd64.tar.gz | tar -zxf - -C $GO_VERSION --strip-components 1) || exit 1
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+fi
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+register_binary go $GO_VERSION/bin/go
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+register_binary gofmt $GO_VERSION/bin/gofmt
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+
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+# Travis-CI sets GOROOT, which confuses later invocations of the Go toolchains.
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+# Explicitly clear GOROOT, so each toolchain uses their default GOROOT.
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+unset GOROOT
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+
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+# Setup GOPATH for pre-module support.
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+MODULE_PATH=$(cd $REPO_ROOT && go list -m -f "{{.Path}}")
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+rm -f gopath/src/$MODULE_PATH # best-effort delete
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+mkdir -p gopath/src/$(dirname $MODULE_PATH)
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+(cd gopath/src/$(dirname $MODULE_PATH) && ln -s $REPO_ROOT $(basename $MODULE_PATH))
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+export GOPATH=$TEST_DIR/gopath
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+
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+# Download dependencies using modules.
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+# For pre-module support, dump the dependencies in a vendor directory.
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+(cd $REPO_ROOT && go mod tidy && go mod vendor) || exit 1
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+
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+# Build and run all targets
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+RET=0
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+function go() {
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+ print "$GO_VERSION $@"
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+ # Use a per-version Go cache to work around bugs in Go build caching.
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+ # See https://golang.org/issue/26883
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+ GO_CACHE="$TEST_DIR/cache.$GO_VERSION"
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+ (cd $GOPATH/src/$MODULE_PATH && GOCACHE=$GO_CACHE $GO_VERSION "$@") || RET=1
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+}
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+go build ./...
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+go test ./...
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+
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+# Run commands that produce output when there is a failure.
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+function check() {
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+ OUT=$(cd $REPO_ROOT && "$@" 2>&1)
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+ if [ ! -z "$OUT" ]; then
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+ print "$@"
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+ echo "$OUT"
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+ RET=1
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+ fi
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+}
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+
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+# Check for stale or unformatted source files.
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+check gofmt -d $(cd $REPO_ROOT && git ls-files '*.go')
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+
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+# Check for changed or untracked files.
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+check git diff --no-prefix HEAD
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+check git ls-files --others --exclude-standard
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+
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+# Print termination status.
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+if [ $RET -eq 0 ]; then
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+ echo -e "\x1b[32;1mPASS\x1b[0m"
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+else
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+ echo -e "\x1b[31;1mFAIL\x1b[0m"
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+fi
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+exit $RET
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Joe Tsai