download.sh: Add script

diff --git a/download.sh b/download.sh
new file mode 100755 (executable)
index 0000000..3c3d0cc
--- /dev/null
+++ b/download.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+TEMP=$(mktemp -d)
+wget -q -P${TEMP} https://opensource.apple.com/tarballs/${1}/${1}-${2}.tar.gz
+tar xf ${TEMP}/${1}-${2}.tar.gz -C ${1} --strip-components=1
+echo "${2}" > ${1}/.apple_version