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#!/bin/bash
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# This tool contains functions that are to be used to handle/enable funsize
# Author: Mihai Tabara
#
HOOK=
AWS_BUCKET_NAME=
LOCAL_CACHE_DIR=
# Don't cache files smaller than this, as it's slower with S3
# Bug 1437473
CACHE_THRESHOLD=500000
S3_CACHE_HITS=0
S3_CACHE_MISSES=0
getsha512(){
openssl sha512 "${1}" | awk '{print $2}'
}
print_usage(){
echo "$(basename "$0") [-S S3-BUCKET-NAME] [-c LOCAL-CACHE-DIR-PATH] [-g] [-u] PATH-FROM-URL PATH-TO-URL PATH-PATCH"
echo "Script that saves/retrieves from cache presumptive patches as args"
echo ""
echo "-A SERVER-URL - host where to send the files"
echo "-c LOCAL-CACHE-DIR-PATH local path to which patches are cached"
echo "-g pre hook - tests whether patch already in cache"
echo "-u post hook - upload patch to cache for future use"
echo ""
echo "PATH-FROM-URL : path on disk for source file"
echo "PATH-TO-URL : path on disk for destination file"
echo "PATH-PATCH : path on disk for patch between source and destination"
}
upload_patch(){
if [ "$(stat -c "%s" "$2")" -lt ${CACHE_THRESHOLD} ]
then
return 0
fi
sha_from=$(getsha512 "$1")
sha_to=$(getsha512 "$2")
patch_path="$3"
patch_filename="$(basename "$3")"
# save to local cache first
if [ -n "$LOCAL_CACHE_DIR" ]; then
local_cmd="mkdir -p "$LOCAL_CACHE_DIR/$sha_from""
if $local_cmd >&2; then
cp -avf "${patch_path}" "$LOCAL_CACHE_DIR/$sha_from/$sha_to"
echo "${patch_path} saved on local cache."
fi
fi
if [ -n "${AWS_BUCKET_NAME}" ]; then
BUCKET_PATH="s3://${AWS_BUCKET_NAME}${sha_from}/${sha_to}/${patch_filename}"
if aws s3 cp "${patch_path}" "${BUCKET_PATH}"; then
echo "${patch_path} saved on s://${AWS_BUCKET_NAME}"
return 0
fi
echo "${patch_path} failed to be uploaded to s3://${AWS_BUCKET_NAME}"
return 1
fi
return 0
}
get_patch(){
# $1 and $2 are the /path/to/filename
if [ "$(stat -c "%s" "$2")" -lt ${CACHE_THRESHOLD} ]
then
return 1
fi
sha_from=$(getsha512 "$1")
sha_to=$(getsha512 "$2")
destination_file="$3"
s3_filename="$(basename "$3")"
# Try to retrieve from local cache first.
if [ -n "$LOCAL_CACHE_DIR" ]; then
if [ -r "$LOCAL_CACHE_DIR/$sha_from/$sha_to" ]; then
cp -avf "$LOCAL_CACHE_DIR/$sha_from/$sha_to" "$destination_file"
echo "Successful retrieved ${destination_file} from local cache."
return 0
fi
fi
# If not in the local cache, we might find it remotely.
if [ -n "${AWS_BUCKET_NAME}" ]; then
BUCKET_PATH="s3://${AWS_BUCKET_NAME}${sha_from}/${sha_to}/${s3_filename}"
if aws s3 ls "${BUCKET_PATH}"; then
((S3_CACHE_HITS++))
echo "s3 cache hit for ${s3_filename} (${S3_CACHE_HITS} total hits)"
if aws s3 cp "${BUCKET_PATH}" "${destination_file}"; then
echo "Successful retrieved ${destination_file} from s3://${AWS_BUCKET_NAME}"
return 0
else
echo "Failed to retrieve ${destination_file} from s3://${AWS_BUCKET_NAME}"
return 1
fi
# Not found, fall through to default error
else
((S3_CACHE_MISSES++))
echo "s3 cache miss for ${s3_filename} (${S3_CACHE_MISSES} total misses)"
fi
fi
return 1
}
OPTIND=1
while getopts ":S:c:gu" option; do
case $option in
S)
# This will probably be bucketname/path/prefix but we can use it either way
AWS_BUCKET_NAME="$OPTARG"
# Ensure trailing slash is there.
if [[ ! $AWS_BUCKET_NAME =~ .*/$ ]]; then
AWS_BUCKET_NAME="${AWS_BUCKET_NAME}/"
fi
;;
c)
LOCAL_CACHE_DIR="$OPTARG"
;;
g)
HOOK="PRE"
;;
u)
HOOK="POST"
;;
\?)
echo "Invalid option: -$OPTARG" >&2
print_usage
exit 1
;;
:)
echo "Option -$OPTARG requires an argument." >&2
print_usage
exit 1
;;
*)
echo "Unimplemented option: -$OPTARG" >&2
print_usage
exit 1
;;
esac
done
shift $((OPTIND-1))
if [ "$HOOK" == "PRE" ]; then
get_patch "$1" "$2" "$3"
elif [ "$HOOK" == "POST" ]; then
upload_patch "$1" "$2" "$3"
fi
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