pull-gui.sh

#!/usr/bin/env bash

#####################################################################
# @author Lukasz Opiola
# @copyright (C): 2016 ACK CYFRONET AGH
# This software is released under the MIT license
# cited in 'LICENSE.txt'.
#####################################################################
# usage:
# ./pull-gui.sh <path to gui-config>
#
# This script copies static GUI files included in a static docker.
# Can be used to download GUI files during release building.
# Requires configuration file that defines target directory and docker
# image that should be used.
#
# Requires gui config that is a sh script exporting following envs:
#   TARGET_DIR
#   PRIMARY_IMAGE
#   SECONDARY_IMAGE
#####################################################################

# If docker command is not present, just skip gui pull and continue.
command -v docker >/dev/null 2>&1 || {
    echo "WARNING: docker client not found, continuing without pulling gui." >&2;
    exit 0;
}

# Check if file with config is given
if [[ ! -f "${1}" ]]; then
    echo "Usage:"
    echo "    ./pull-gui.sh <path to gui config>"
    exit 1
fi

TARGET_DIR=''
PRIMARY_IMAGE=''
SECONDARY_IMAGE=''
# Source gui config which should contain following exports:
# TARGET_DIR
# PRIMARY_IMAGE
# SECONDARY_IMAGE
source ${1}

if [[ -z ${TARGET_DIR} ]]; then
    echo "TARGET_DIR not defined in ${1}, aborting"
    exit 1
fi
if [[ -z ${PRIMARY_IMAGE} ]]; then
    echo "PRIMARY_IMAGE not defined in ${1}, aborting"
    exit 1
fi
if [[ -z ${SECONDARY_IMAGE} ]]; then
    echo "SECONDARY_IMAGE not defined in ${1}, aborting"
    exit 1
fi

STATIC_FILES_IMAGE=${PRIMARY_IMAGE}
docker pull ${STATIC_FILES_IMAGE} 2>/dev/null
if [ $? -ne 0 ]; then
    STATIC_FILES_IMAGE=${SECONDARY_IMAGE}
    docker pull ${STATIC_FILES_IMAGE} 2>/dev/null
    if [ $? -ne 0 ]; then
        echo "Cannot pull primary nor secondary docker image for static GUI files. Exiting."
        exit 1
    fi
fi

set -e

echo "Copying static GUI files"
echo "    from image: ${STATIC_FILES_IMAGE}"
echo "    under path: ${TARGET_DIR}"

# Create docker volume based on given image. Path /var/www/html is arbitrarily
# chosen, could be anything really - it must be later referenced in docker cp.
CONTAINER_ID=`docker create -v /var/www/html ${STATIC_FILES_IMAGE} /bin/true`

# Create required dirs
mkdir -p ${TARGET_DIR}

# Remove old files (if any)
rm -rf ${TARGET_DIR}

# Copy the files ( -L = follow symbolic links ) - warning:
#   this works on docker client 1.10+ !
# Use path from docker create volume
docker cp -L ${CONTAINER_ID}:/var/www/html ${TARGET_DIR}

# Remove unneeded container
docker rm -f ${CONTAINER_ID}