Bggp5

This year’s Binary Golf Grand Prix (BGGP5) states the following goal:

Create the smallest file that downloads [LINK] text file and displays its contents.

Instead of an actual compiled program, I thought I’d go for something a little bit more obscure. A Downloader using the build system cmake!

I’m using Linux, so to install the build system run:

sudo apt install cmake

This is the version I am running:

$ cmake --version
cmake version 3.28.3

… and here’s the downloader:

cmake_minimum_required(VERSION 3.28)
include(FetchContent)
FetchContent_Declare(b URL https://binary.golf/5/5 DOWNLOAD_NO_EXTRACT TRUE)
FetchContent_MakeAvailable(b)
execute_process (COMMAND bash -c "cat _deps/b-subbuild/b-populate-prefix/src/5" OUTPUT_VARIABLE o)
MESSAGE(INFO ${o})

All this does is fetch the downloader from the URL specified in the challenge and then execute the cat bash command to print the downloaded file’s content to stdout. You can use this script for testing my entry:

#!/bin/bash

rm -rf build
mkdir build ; cd build
cmake ..

Running the shell script, which in turn just sets up a directory and runs cmake, yields the following output:

CMake Warning (dev) in CMakeLists.txt:
  No project() command is present.  The top-level CMakeLists.txt file must
  contain a literal, direct call to the project() command.  Add a line of
  code such as

    project(ProjectName)

  near the top of the file, but after cmake_minimum_required().

  CMake is pretending there is a "project(Project)" command on the first
  line.
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) in CMakeLists.txt:
  cmake_minimum_required() should be called prior to this top-level project()
  call.  Please see the cmake-commands(7) manual for usage documentation of
  both commands.
This warning is for project developers.  Use -Wno-dev to suppress it.

-- The C compiler identification is GNU 13.2.0
-- The CXX compiler identification is GNU 13.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
INFOAnother #BGGP5 download!! @binarygolf https://binary.golf

-- Configuring done (1.1s)
-- Generating done (0.0s)
-- Build files have been written to: /home/nmt/work/hacking/bggp/cmake-downloader/build

Note that the file’s contents are printed in the line starting with INFO.

Here’s the SHA256 of my entry, the CMakeLists.txt has 283 bytes.

SHA256: 27a46761d80b58565970b941d2f0e8f26626e4b3756705a0d121bb8271c0a0f2  

0xca7