docker-build-caching-bug.sh

#!/bin/sh

set -e

touch /tmp/linked
ln -s /tmp/linked . || true

cat <<EOF > Dockerfile
FROM busybox:ubuntu-14.04
ADD . /data
CMD ["/bin/cat", "/data/volatilefile.txt"]
EOF

cat <<EOF > volatilefile.txt
volatile-orig
EOF

docker build -t test .

cat <<EOF > volatilefile.txt
volatile-updated
EOF

docker build -t test .

# now the test. should work on docker < 1.9.0 and break with docker = 1.9.0
output=`docker run --rm test || true`

if [ "${output}" != "volatile-updated" ]
then
  echo "BUG: output was '${output}', expected 'volatile-updated'"
  exit 1
else
  echo "OK: output was '${output}', same as expected"
  exit 0
fi