Get all Apple macOS sources in one go.

get-sources.sh

#!/usr/bin/env bash
# Updated to work in 2017 from the original: http://hints.macworld.com/article.php?story=20091014194517371
# --- applesource.bash --- downloads source code for an entire Apple release

# Take input from command-line (use "10.5.8", "10.6.1", etc.)
# Example: ./get-sources.sh 10.12.4
  version="macos-`echo $* | tr -d "."`"

# URL:
  homepage="https://opensource.apple.com"
  URL="${homepage}/release/${version}.html"

# Announce beginning, and prepare a directory for the untarred sources
  echo "Preparing to download..."
  sources="./${version}-sources"
  mkdir -p ${sources}
  
# Process the webpage for the locations of the tarballs themselves
  curl --silent ${URL} | sed -n 's/<a href="\(.*.tar.gz\)">/\1/p' | \
    while read line; do
    
      # Find and announce the name of the next tarball to be downloaded
        tarball=".${line}"
        echo -e "\nDownloading `basename ${tarball}`..."

      # Download the tarball and keep Apple's original directory structure intact
        curl --create-dirs --output ${tarball} "${homepage}${line}"

      # Untar into the "sources" directory (see line 13)
        tar xfz "${tarball}" -C ${sources}

    done

# Compress all sourcefiles into a single tarball for posterity
  echo "Creating ${version}.tar.gz from all sources..."
# Having the "v" option slows things down considerably 
#  tar cfvz "${version}.tar.gz" ${sources}
  tar cfz "${version}.tar.gz" ${sources}

# Explicitly show that everything finished.
  echo "Done."
 
# I like for my Mac to talk to me, although sometimes this can be creepy.
# say "The source of ${version} is now ready."