120 lines
3.6 KiB
Bash
Executable File
120 lines
3.6 KiB
Bash
Executable File
#!/bin/bash
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# Copyright 2012 Hewlett-Packard Development Company, L.P.
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# Copyright 2013 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
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set -x
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fi
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set -eu
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set -o pipefail
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# Download a URL to a local cache
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# e.g. cache-url http://.../foo ~/.cache/image-create/foo
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SCRIPT_NAME=$(basename $0)
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SCRIPT_HOME=$(dirname $0)
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FORCE_REVALIDATE=0
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function show_options () {
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echo "Usage: $SCRIPT_NAME [options] <url> <destination_file>"
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echo
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echo "Download a URL and cache it to a specified location."
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echo "Subsequent requests will compare the last modified date"
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echo "of the upstream file to determine whether it needs to be"
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echo "downloaded again."
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echo
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echo "Options:"
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echo " -f -- force upstream caches to fetch a new copy of the file"
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echo " -h -- show this help"
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echo
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exit $1
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}
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TEMP=$(getopt -o hf -n $SCRIPT_NAME -- "$@")
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if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi
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# Note the quotes around `$TEMP': they are essential!
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eval set -- "$TEMP"
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while true ; do
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case "$1" in
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-h|"-?") show_options 0;;
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-f) FORCE_REVALIDATE=1; shift 1;;
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--) shift; break;;
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*) echo "Error: unsupported option $1." ; exit 1 ;;
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esac
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done
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url=$1
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dest=$2
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time_cond=
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curl_opts=(--retry 3 --retry-delay 30)
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if [ -z $url -o -z $dest ] ; then
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show_options 1
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fi
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if [ -p $dest ]; then
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type="fifo"
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tmp=$(mktemp --tmpdir download.XXXXXXXX)
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else
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type="normal"
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mkdir -p $(dirname $dest)
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tmp=$(mktemp $(dirname $dest)/.download.XXXXXXXX)
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fi
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if [ "$FORCE_REVALIDATE" = "1" ]; then
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curl_opts+=(-H "Pragma: no-cache, must-revalidate" -H "Cache-Control: no-cache, must-revalidate")
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success="Downloaded and cached $url, having forced upstream caches to revalidate"
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elif [ -f $dest -a -s $dest ] ; then
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time_cond="-z $dest"
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success="Server copy has changed. Using server version of $url"
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else
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success="Downloaded and cached $url for the first time"
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fi
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rcode=$(curl -v -L -o $tmp -w '%{http_code}' --connect-timeout 10 "${curl_opts[@]}" $url $time_cond)
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if [ "$rcode" == "200" -o "${url:0:7}" == "file://" ] ; then
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# In cases where servers ignore the Modified time,
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# curl cancels the download, outputs a 200 and leaves
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# the output file untouched, we don't want this empty file.
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if [ -n "$time_cond" -a ! -s $tmp ] ; then
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echo "Ignoring empty file returned by curl. Using locally cached $url"
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rm -f $tmp
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else
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echo $success
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if [ "fifo" = "$type" ]; then
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cp $tmp $dest
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rm $tmp
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else
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mv $tmp $dest
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fi
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fi
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# 213 is the response to a ftp MDTM command, curl outputs a 213 as the status
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# if the url redirected to a ftp server and Not-Modified
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elif [ "$rcode" = "304" -o "$rcode" = "213" ] ; then
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echo "Server copy has not changed. Using locally cached $url"
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rm -f $tmp
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else
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echo "Server returned an unexpected response code. [$rcode]"
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rm -f $tmp
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# expose some error codes so the calling process might know what happened
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if [ "$rcode" = "404" ] ; then
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exit 44
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fi
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exit 1
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fi
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