docker-magento/compose/bin/copyfromcontainer

#!/usr/bin/env bash
[ -z "$1" ] && echo "Please specify a directory or file to copy from container (ex. vendor, --all)" && exit

CONTAINER_ID=$(bin/docker-compose ps -q phpfpm | awk '{print $1}')
REAL_SRC=$(cd -P "src" >/dev/null && pwd)
if [ ! -d "$REAL_SRC" ]; then
  mkdir -p "$REAL_SRC"
fi

if [ "$1" == "--all" ]; then
  docker cp "$CONTAINER_ID":/var/www/html/./ "$REAL_SRC/"
  echo "Completed copying all files from container to host"
else
  if [ -f "$1" ] ; then
    docker cp "$CONTAINER_ID":/var/www/html/"$1" "$REAL_SRC/$1"
  else
    docker cp "$CONTAINER_ID":/var/www/html/"$1" "$REAL_SRC/$(dirname "$1")"
  fi
  echo "Completed copying $1 from container to host"
fi