#!/usr/bin/env bash
#
# SPDX-FileCopyrightText: © Vegard IT GmbH (https://vegardit.com)
# SPDX-FileContributor: Sebastian Thomschke
# SPDX-License-Identifier: Apache-2.0
# SPDX-ArtifactOfProjectHomePage: https://github.com/vegardit/docker-gitea-act-runner

source /opt/bash-init.sh

#################################################################
# print header
#################################################################
if [[ ${1:-} == "" ]]; then
  cat <<'EOF'
   _____ _ _                            _     _____
  / ____(_) |                 /\       | |   |  __ \
 | |  __ _| |_ ___  __ _     /  \   ___| |_  | |__) |   _ _ __  _ __   ___ _ __
 | | |_ | | __/ _ \/ _` |   / /\ \ / __| __| |  _  / | | | '_ \| '_ \ / _ \ '__|
 | |__| | | ||  __/ (_| |  / ____ \ (__| |_  | | \ \ |_| | | | | | | |  __/ |
  \_____|_|\__\___|\__,_| /_/    \_\___|\__| |_|  \_\__,_|_| |_|_| |_|\___|_|
EOF

  cat /opt/build_info
  echo

  log INFO $(act_runner --version)
  log INFO "Timezone: $(date +"%Z %z")"
  log INFO "Hostname: $(hostname -f)"
  log INFO "IP Addresses: "
  awk '/32 host/ { if(uniq[ip]++ && ip != "127.0.0.1") print " - " ip } {ip=$2}' /proc/net/fib_trie
fi


#################################################################
# start docker deamon (if installed = DinD)
#################################################################
if [[ -f /usr/bin/dockerd-rootless.sh ]]; then
  export DOCKER_MODE=dind-rootless
  log INFO "Starting Docker engine (rootless)..."
  export DOCKER_HOST=unix://$HOME/.docker/run/docker.sock
  if [ ! -f $HOME/.config/docker/daemon.json ]; then
    # workaround for "Not using native diff for overlay2, this may cause degraded performance for building images: running in a user namespace  storage-driver=overlay2"
    mkdir -p $HOME/.config/docker
    echo '{"storage-driver":"fuse-overlayfs"}' > $HOME/.config/docker/daemon.json
  fi

  export container=docker # from dind-hack
  export XDG_RUNTIME_DIR=$HOME/.docker/run
  mkdir -p $XDG_RUNTIME_DIR
  rm -f $XDG_RUNTIME_DIR/docker.pid $XDG_RUNTIME_DIR/docker/containerd/containerd.pid
  /usr/bin/dockerd-rootless.sh -p $HOME/.docker/run/docker.pid > "$HOME/.docker/docker.log" 2>&1 &
  export DOCKER_PID=$!
  while ! docker stats --no-stream &>/dev/null; do
    log INFO "Waiting for Docker engine to start..."
    sleep 2
    tail -n 1 /data/.docker/docker.log
  done
  echo "==========================================================="
  docker info
  echo "==========================================================="
elif [[ -f /usr/bin/dockerd ]]; then
  export DOCKER_MODE=dind
  log INFO "Starting Docker engine..."
  sudo rm -f /var/run/docker.pid /run/docker/containerd/containerd.pid
  sudo /usr/local/bin/dind-hack true
  sudo service docker start
  while ! docker stats --no-stream &>/dev/null; do
    log INFO "Waiting for Docker engine to start..."
    sleep 2
    tail -n 1 /var/log/docker.log
  done
  export DOCKER_PID=$(</var/run/docker.pid)
  echo "==========================================================="
  docker info
  echo "==========================================================="
else
  export DOCKER_MODE=dood
fi

if [[ -z ${GITEA_RUNNER_JOB_CONTAINER_DOCKER_HOST:-} ]]; then
  export GITEA_RUNNER_JOB_CONTAINER_DOCKER_HOST=${DOCKER_HOST:-unix:///var/run/docker.sock}
fi


#################################################################
# check if act user UID/GID needs adjustment
#################################################################
fix_permissions=false
if [ -n "${GITEA_RUNNER_UID:-}" ]; then
  effective_uid=$(id -u act)
  if [ "$GITEA_RUNNER_UID" != "$effective_uid" ]; then
    fix_permissions=true
  fi
fi

if [ -n "${GITEA_RUNNER_GID:-}" ]; then
  effective_gid=$(id -g act)
  if [ "$GITEA_RUNNER_GID" != "$effective_gid" ]; then
    fix_permissions=true
  fi
fi


#################################################################
# check if act user has read/write access to /var/run/docker.sock
#################################################################
if [[ $DOCKER_MODE != "dind-rootless" ]]; then
  if [[ ! -w /var/run/docker.sock || ! -r /var/run/docker.sock ]]; then
    docker_group=$(stat -c '%G' /var/run/docker.sock)
    if [[ $docker_group == "UNKNOWN" ]]; then
      docker_gid=$(stat -c '%g' /var/run/docker.sock)
      docker_group="docker$docker_gid"
      fix_permissions=true
    fi

    if ! id -nG act | grep -qw "$docker_group"; then
      fix_permissions=true
    fi
  fi
fi


#################################################################
# adjust act user UID/GID if required
#################################################################
if [[ $fix_permissions == "true" ]]; then
  log INFO "Fixing permissions..."
  exec sudo -E bash /opt/fix_permissions.sh
else
  exec bash /opt/run_runner.sh
fi