#!/bin/bash

# Copyright 2016 The Kubernetes Authors All rights reserved.
#
# 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 -o errexit
set -o nounset
set -o pipefail

KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
source "${KUBE_ROOT}/hack/lib/init.sh"

cd "${KUBE_ROOT}"

# Use eval to preserve embedded quoted strings.
eval "goflags=(${KUBE_GOFLAGS:-})"

# Filter out arguments that start with "-" and move them to goflags.
targets=()
for arg; do
  if [[ "${arg}" == -* ]]; then
    goflags+=("${arg}")
  else
    targets+=("${arg}")
  fi
done

if [[ ${#targets[@]} -eq 0 ]]; then
  # Do not run on third_party directories.
  targets=$(go list ./... | egrep -v "/(third_party|vendor)/")
fi

# Do this in parallel; results in 5-10x speedup.
pids=""
for i in $targets
  do
  (
    # Run go vet using goflags for each target specified.
    #
    # Remove any lines go vet or godep outputs with the exit status.
    # Remove any lines godep outputs about the vendor experiment.
    #
    # If go vet fails (produces output), grep will succeed, but if go vet
    # succeeds (produces no output) grep will fail. Then we just use
    # PIPESTATUS[0] which is go's exit code.
    #
    # The intended result is that each incantation of this line returns
    # either 0 (pass) or 1 (fail).
    go vet "${goflags[@]:+${goflags[@]}}" "$i" 2>&1 \
      | grep -v -E "exit status|GO15VENDOREXPERIMENT=" \
      || fail=${PIPESTATUS[0]}
    exit $fail
  ) &
  pids+=" $!"
done

# Count and return the number of failed files (non-zero is a failed vet run).
failedfiles=0
for p in $pids; do
  wait $p || let "failedfiles+=1"
done

exit $failedfiles