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#!/bin/sh
##############################################################################
# Copyright (c) 2016 Red Hat Inc.
# Dan Radez <dradez@redhat.com>
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
source ./variables.sh
# Make sure the cache dir exists
function cache_dir {
if [ -f $CACHE_DIR ]; then rm -rf $CACHE_DIR; fi
if [ ! -d $CACHE_DIR/ ]; then mkdir $CACHE_DIR/; fi
if [ ! -f $CACHE_DIR/$CACHE_HISTORY ]; then touch $CACHE_DIR/$CACHE_HISTORY; fi
echo "Cache Dir: $CACHE_DIR"
}
# $1 = download url
# $2 = filename to write to
function curl_file {
if [ -f $CACHE_DIR/$2 ]; then
echo "Removing stale $2"
rm -f $CACHE_DIR/$2
fi
echo "Downloading $1"
echo "Cache download location: $CACHE_DIR/$2"
until curl -C- -L -o $CACHE_DIR/$2 $1 || (( count++ >= 20 )); do
echo -n '' #do nothing, we just want to loop
done
sed -i "/$2/d" $CACHE_DIR/$CACHE_HISTORY
echo "$(md5sum $CACHE_DIR/$2) $2" >> $CACHE_DIR/$CACHE_HISTORY
}
# $1 = download url
# $2 = remote md5
function populate_cache {
local my_md5
cache_dir
# get the file name
filename="${1##*/}"
# copy passed in md5
remote_md5=$2
# check if the cache file exists
# and if it has an md5 compare that
echo "Checking if cache file exists: ${filename}"
if [ ! -f $CACHE_DIR/${filename} ]; then
echo "Cache file: ${CACHE_DIR}/${filename} missing...will download..."
curl_file $1 $filename
else
echo "Cache file exists...comparing MD5 checksum"
if [ -z "$remote_md5" ]; then
remote_md5="$(curl -sf -L ${1}.md5 | awk {'print $1'})"
fi
if [ -z "$remote_md5" ]; then
echo "Got empty MD5 from remote for $filename, skipping MD5 check"
curl_file $1 $filename
else
my_md5=$(grep ${filename} ${CACHE_DIR}/${CACHE_HISTORY} | awk {'print $1'})
if [ -z "$my_md5" ]; then
echo "${filename} missing in ${CACHE_HISTORY} file. Caculating md5..."
my_md5=$(md5sum ${CACHE_DIR}/${filename} | awk {'print $1'})
fi
if [ "$remote_md5" != "$my_md5" ]; then
echo "MD5 mismatch, local cache file MD5 is ${my_md5}"
echo " remote cache file MD5 is ${remote_md5}"
echo "Downloading $filename"
curl_file $1 $filename
else
echo "Will use cache for ${filename}"
fi
fi
fi
}
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