tools/internal_ci/helper_scripts/prepare_build_linux_rc

#!/bin/bash
# Copyright 2017 gRPC 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.

# Source this rc script to prepare the environment for linux builds

# Print basic info about the kokoro worker
{ set +x; } 2>/dev/null
echo "-- Kokoro worker info --"
echo "Kokoro pool: ${KOKORO_JOB_POOL:-undefined}"
if [[ -f /GRPC_IMAGE_NAME ]]; then
  echo "gRPC custom VM image: $(cat /GRPC_IMAGE_NAME)"
fi
echo -e "System: $(uname -a)"
echo -e "Python: $(python3 -VV)\n"
echo -e "-- OS --\n$(lsb_release -a 2>/dev/null)\n"
echo -e "-- CPU --\n$(lscpu)\n"
echo -e "-- Memory --\n$(lsmem --summary)\n$(free -h --si)\n"
echo -e "-- Block devices --\n$(lsblk --all --fs --paths)\n"
set -x

# Need to increase open files limit for c tests
ulimit -n 32768

# 1. Move docker's storage location to scratch disk so we don't run out of space.
# 2. Use container registry mirror for pulling docker images (should make downloads faster)
#    See https://cloud.google.com/container-registry/docs/using-dockerhub-mirroring
GRPC_DOCKER_OPTS="--data-root=/tmpfs/docker --registry-mirror=https://mirror.gcr.io"

# Update global docker configuration to have GRPC_DOCKER_OPTS
P1NAME=$(ps -p 1 -o comm=)
if [[ $P1NAME == *"systemd"* ]];  then
  # https://stackoverflow.com/questions/27763340
  sudo sed -i -E "s|ExecStart=(.*)//|EnvironmentFile=/etc/default/docker\nExecStart=\nExecStart=\1// \$DOCKER_OPTS|" /lib/systemd/system/docker.service
  sudo systemctl daemon-reload
  echo "DOCKER_OPTS=\"${GRPC_DOCKER_OPTS}\"" | sudo tee --append /etc/default/docker
  sudo systemctl restart docker.service
else
  echo "DOCKER_OPTS=\"\${DOCKER_OPTS} ${GRPC_DOCKER_OPTS}\"" | sudo tee --append /etc/default/docker
  sudo service docker restart
fi

git submodule update --init

python3 -m pip install six

# Allows the test driver to spin up a GDB subprocess and have it attach to
# another subprocess of the test driver.
sudo bash -c 'echo "0" > /proc/sys/kernel/yama/ptrace_scope'

# Check whether the secondary disk is mounted on /tmpfs correctly.
# Refer to the format_tmpfs.sh Kokoro script for details.
if ! findmnt /tmpfs; then
  echo 'BAD KOKORO WORKER WARNING: it seems that /tmpfs volume with scratch disk is not mounted in the kokoro worker. This can result in unexpected "out of disk space" errors.'
  echo "Disk mounts:"
  mount
fi

# Print the usage after the submodules are updated. Hint: when /tmpfs
# isn't properly mounted, the output will repeat the root fs usage two times.
echo "Initial disk usage:"
df -h / /tmpfs

# Uncomment the following line to debug "out of disk space" errors by print available disk space every 30seconds in the background
# bash -c "while true; do echo 'periodic background disk usage check:'; df -h / /tmpfs; sleep 30; done;" &