Dockerfile cache optimization

gistfile1.txt

#!/bin/bash
platform='unknown'
unamestr=`uname`
if [[ "$OSTYPE" == "linux-gnu"  ]]; then
touchutil='touch'
dateutil='date'
elif [[ "$OSTYPE" == darwin*  ]]; then
brew install coreutils > /dev/null 2>&1
touchutil='gtouch'
dateutil='gdate'
fi
echo "[Git Hook] Running docker cache optimization..."
find . -exec $touchutil -t 201401010000 {} \;
for x in $(git ls-tree --full-tree --name-only -r HEAD);\
        do $touchutil -t \
        $($dateutil -d "$(git log -1 --format=%ci "${x}")" +%y%m%d%H%M.%S) \
        "${x}";
done