handy dandy bazel-in-docker wrapper

bazel.sh

#!/usr/bin/env bash
set -o pipefail
set -o errexit
set -o nounset

CONTAINER_NAME="bazel-$USER"
IMAGE="bazel-$USER"

function log {
  echo "(wrapper) $*" 1>&2
}

function container_exists {
  docker ps -a --format '{{.Names}}' | grep -qE "^$CONTAINER_NAME\$"
}

function container_running {
  docker ps --format '{{.Names}}' | grep -qE "^$CONTAINER_NAME\$"
}

function create_container {
  log "Creating a new container"

  tmpf=$(mktemp)
  trap 'rm -f "$tmpf"' ERR EXIT
  cat > "$tmpf" <<'EOF'
#!/bin/sh
cd "$1"
shift
bazel "$@"
EOF
  chmod 0755 "$tmpf"

  docker create \
    --network host \
    --interactive \
    -v "$HOME:$HOME" \
    -v "/run/user/$UID/gnupg:/run/user/$UID/gnupg" \
    -v "/var/tmp/_bazel_$USER:/var/tmp/_bazel_$USER" \
    --name "$CONTAINER_NAME" \
    -w "$HOME" \
    "$IMAGE"
  docker cp "$tmpf" "$CONTAINER_NAME:/usr/local/bin/cdbazel.sh"
  rm -f "$tmpf"
}

function start_container {
  log "Starting container"
  docker start "$CONTAINER_NAME"
}

function main {
  if ! container_running; then
    if ! container_exists; then
      create_container
    fi
    start_container
  fi

  docker exec \
    --env SSH_AUTH_SOCK="$SSH_AUTH_SOCK" \
    --user "$UID" \
    --tty \
    --interactive \
    "$CONTAINER_NAME" \
    /usr/local/bin/cdbazel.sh "$PWD" "$@"
}

main "$@"