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#!/bin/bash
##############################################################################
# Copyright (c) 2015 Ericsson AB and others.
# stefan.k.berg@ericsson.com
# jonas.bjurel@ericsson.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
##############################################################################
CACHETRANSPORT=${CACHETRANSPORT:-"curl --silent"}
CACHEBASE=${CACHEBASE:-"file://${HOME}/cache"}
CACHEMAXAGE=${CACHEMAXAGE:-$[14*24*3600]}
CACHEDEBUG=${CACHEDEBUG:-1}
debugmsg () {
if [ "$CACHEDEBUG" -eq 1 ]; then
echo "$@" >&2
fi
}
errormsg () {
echo "$@" >&2
}
# Get a SHA1 based on what's piped into the cache command
getid() {
debugmsg "Generating sha1sum"
sha1sum | sed 's/ .*//'
}
# Put in cache
put() {
if check $1; then
debugmsg "SHA1 $1 already in cache, skipping storage"
else
debugmsg "Storing SHA1 $1 in cache"
${CACHETRANSPORT} -T - ${CACHEBASE}/$1.blob
echo "Expires: $[`date +"%s"` + $CACHEMAXAGE]" | ${CACHETRANSPORT} -T - ${CACHEBASE}/$1.meta
fi
exit 0
}
# Get from cache
get() {
local rc
${CACHETRANSPORT} -o - ${CACHEBASE}/$1.blob 2>/dev/null
rc=$?
if [ $rc -eq 0 ]; then
echo "Got SHA1 $1 from cache" 2>/dev/null
else
echo "Tried to get SHA1 $1 from cache but failed" 2>/dev/null
fi
return $?
}
# Check if in cache
check() {
local rc
${CACHETRANSPORT} ${CACHEBASE}/$1.meta &>/dev/null
rc=$?
if [ $rc -eq 0 ]; then
debugmsg "Checking for SHA1 $1 in cache and found it, rc = $rc"
else
debugmsg "Checking for SHA1 $1 in cache and failed, rc = $rc"
fi
return $rc
}
# Verify that SHA1 seems to be a SHA1...
validSHA1() {
if [ $(echo $1 | wc -c) -ne 41 ]; then
return 1
else
return 0
fi
}
case $1 in
getid)
if [ $# -ne 1 ]; then
errormsg "No arguments can be given to getid!"
exit 1
fi
getid
;;
get|check|put)
if [ $# -ne 2 ]; then
errormsg "Only one argument, the SHA1 sum, can be given to getid!"
exit 1
else
if ! validSHA1 $2; then
errormsg "Invalid SHA1 format!"
exit 1
fi
fi
$1 $2
exit $rc
;;
*)
errormsg "I only know about getid, check, get and put!"
exit 1
esac
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