piecemaker.sh

#!/usr/bin/env sh

set -o errexit

script_name="$(basename "$0")"
project_name="$(basename "$0" ".sh")"
echo "
Try out '$project_name' by prompting for necessary options and isolating it to a docker container.
"

# Use $PWD to avoid using 'realpath' since it isn't always available.
project_dir="$PWD"
test -e "$project_dir/$script_name" || (echo "ERROR: Should run $script_name from the $project_name project directory." 1>&2 && exit 1)

# Exit early if required commands are not available.
for cmd in \
  "docker" \
  ; do
  has_cmd="$(command -v "$cmd" || echo "no")"
  if [ "$has_cmd" = "no" ]; then
    echo "ERROR: This script requires the '$cmd' command." 1>&2
    exit 1
  fi
done

# Make sure docker daemon is running first before prompting the user.
is_docker_up="$(docker ps -q -l || echo "no")"
if [ "$is_docker_up" = "no" ]; then
  echo "ERROR: Failed check if docker daemon was ready. Start docker daemon first." 1>&2
  exit 1
fi

tmp_iidfile="$(mktemp)"
docker build \
  --target app \
  --iidfile "$tmp_iidfile" \
  .
image_name="$(cat "$tmp_iidfile")"
rm -f "$tmp_iidfile"

# Use prompts instead of passing options since this is only for demonstration purposes.
echo "
---
"

default_number_of_pieces="100"
echo "Target count of pieces. Will be adjusted depending on other criteria.
Default: $default_number_of_pieces"
read -r number_of_pieces
number_of_pieces="${number_of_pieces:-$default_number_of_pieces}"

# https://commons.wikimedia.org/wiki/File:Jardin_botanique_Roger-Van_den_Hende_01.jpg
default_image_file="examples/Jardin_botanique_Roger-Van_den_Hende_01.jpg"
echo "Enter the relative file path for the image to cut into pieces.
Default: $default_image_file"
read -r image_file
image_file="${image_file:-$default_image_file}"
image_file="$project_dir/$image_file"
test -e "$image_file" || (echo "ERROR: File doesn't exist: $image_file" 1>&2 && exit 1)

default_output_dir="output"
echo "Enter the relative directory path to output the files to.
Default: $default_output_dir"
read -r output_dir
output_dir="${output_dir:-$default_output_dir}"
ts="$(date +%F-%H_%M_%S)";
bn_image_name="$(basename "$image_file" ".jpg")"
output_dir="$project_dir/$output_dir/piecemaker-$number_of_pieces-$bn_image_name/$ts"
mkdir -p "$output_dir" || printf ""
test -d "$output_dir" || (echo "ERROR: Directory doesn't exist: $output_dir" 1>&2 && exit 1)

echo "
---
"

echo "INFO $script_name: Creating files in $output_dir directory."
bn_image_file="$(basename "$image_file")"

container_name="piecemaker"
cleanup() {
  docker stop --time 1 "$container_name" > /dev/null 2>&1 || printf ''
  docker container rm "$container_name" > /dev/null 2>&1 || printf ''
  docker image rm "$image_name"
}
trap 'cleanup; trap - EXIT; exit' EXIT INT HUP
docker run \
  -it \
  --name "$container_name" \
  --mount "type=bind,src=${project_dir}/src,dst=/home/dev/app/src,readonly" \
  --mount "type=bind,src=$image_file,dst=/data/$bn_image_file,readonly=true" \
  "$image_name" --dir=/home/dev/output --number-of-pieces="$number_of_pieces" "/data/$bn_image_file"
docker cp --quiet "$container_name:/home/dev/output/" "$output_dir"