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View docker-save.sh
#!/bin/bash -ex
# Wrapper for 'docker save' fixing,
# https://github.com/dotcloud/docker/issues/3877
# In addition: this script will always save exactly one image (possibly
# multiple tags).
IMAGE=$1
TARGET=$2
NAME=`echo $IMAGE | awk -F':' '{print $1}'`
ID=`docker inspect $IMAGE | python -c "import sys,json; print json.load(sys.stdin)[0]['id']"`