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|
#!/bin/sh
# Copyright (C) 2012-2013 Aleksey Lim
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
[ "${V}" ] && set -x
PARCEL_SUFFIX=".parcel"
info() {
echo "-- $@"
}
phase() {
echo " $@"
}
warning() {
echo "-- $@"
}
abort() {
rm -f *.sync
echo "-- $@"
[ "${V}" ] || echo " run \"V=1 $0 ${cmdline}\" to get full debugging output"
exit 1
}
help() {
cat <<EOF
Usage: $(basename $0) [PATH] [URL]
Sugar Network sneakernet synchronization utility.
Command arguments:
PATH if specified, utility will try to recursively search for
synchronization packet files (files with "$PARCEL_SUFFIX" suffix);
using wget or curl utility, each file will be uploaded
to the targeting Sugar Network server with downloading resulting
packets; on success, uploaded packets will be removed and resulting
packets will be placed to PATH instead
URL if specified, should be Sugar Network API url, e.g.,
http://node.sugarlabs.org; instead of synchronization, the script
will download full data dump from the specified master node
Utility is intended to upload request packet files (generated by Sugar Network
slave node) to Sugar Network master server and download response packets
to deliver them back to slave.
See http://wiki.sugarlabs.org/go/Sugar_Network for details.
EOF
}
get_hostname() {
echo $@ | awk -F/ '{print $3}'
}
get_header_key() {
local package="$1"
local key="$2"
zcat "${package}" | head -n1 | \
grep -o "\"${key}\":[^,}]\+" | \
sed 's/^[^:]*://; s/^[ "]*//; s/"$//'
}
upload() {
local url="$1"
local cookie="$2"
local in_packet="$3"
local out_packet="${in_packet}.sync"
[ -e "${out_packet}" ] && abort "Destination ${out_packet} already exists"
if which wget >/dev/null 2>&1; then
cmd="wget --output-document=${out_packet} --load-cookies=${cookie} --save-cookies=${cookie}"
[ "${in_packet}" ] && cmd="${cmd} --post-file=${in_packet}"
[ "${V}" ] && cmd="${cmd} --server-response" || cmd="${cmd} --quiet"
else
cmd="curl --output ${out_packet} --cookie ${cookie} --cookie-jar ${cookie}"
[ "${in_packet}" ] && cmd="${cmd} -XPOST --data-binary @${in_packet}"
[ "${V}" ] || cmd="${cmd} --silent"
fi
${cmd} "${url}" || abort "Cannot run upload command"
if [ -e "${out_packet}" ]; then
if [ $(stat -c %s "${out_packet}") -eq 0 ]; then
rm "${out_packet}"
else
if [ "${in_packet}" ]; then
phase "Replace ${in_packet} with results"
mv "${out_packet}" "${in_packet}" || abort "Cannot write to ${in_packet}"
else
out_filename="$(get_hostname $url)"$PARCEL_SUFFIX
phase "Store results in ${out_filename}"
mv "${out_packet}" "${out_filename}" || abort "Cannot write to ${out_filename}"
fi
fi
fi
if [ -e "${cookie}" ]; then
if grep unset_sugar_network_pull "${cookie}" >/dev/null; then
rm "${cookie}"
elif grep sugar_network_pull "${cookie}" >/dev/null; then
phase "Postpone pull with ${cookie}"
else
rm "${cookie}"
fi
fi
if [ "${in_packet}" ]; then
phase "Remove uploaded file"
rm "${in_packet}"
fi
}
pull() {
local api_url="$1?cmd=pull"
local cookie="$(get_hostname $1).cookie"
while true; do
local disk_free=$(df . --block-size=1 | tail -n1 | awk '{print $4}')
[ $disk_free -gt $disk_limit ] || abort \
"No free disk space on $PWD, copy all *.cookie files" \
"to directory with more free space and re-run $0 from there"
upload "${api_url}&accept_length=${disk_free}" "${cookie}"
[ -e "${cookie}" ] || break
delay=$(grep -o 'sugar_network_delay[[:space:]]*[0-9]\+' "${cookie}" 2>/dev/null | awk '{print $2}')
if [ "${delay}" ]; then
phase "Server started processing pull, check for results in ${delay} seconds"
sleep ${delay}
else
phase "Pull postponed updates"
fi
done
}
sync_path="$1"
clone_url="$2"
cmdline="$@"
FS=
disk_limit=$(expr 1024 \* 1024 \* 10)
if [ $# -eq 0 ]; then
if [ "$(basename $(dirname $0))" = "sugar-network-sync" ]; then
# Script was launched from sync directory, so, process sync
sync_path="$(dirname $0)"
else
help
exit 0
fi
fi
mkdir -p "${sync_path}" || abort "Cannot create ${sync_path} sync directory"
cd "${sync_path}" || abort "Cannot switch to ${sync_path} sync directory"
mountpoint="$(stat --printf %m .)"
[ "${mountpoint}/sugar-network-sync" = "$PWD" ] || \
info "NOTICE To make $PWD directory capable for further auto synchronization, place it to the mount's root"
if [ "${clone_url}" ]; then
info "Clone master"
pull "${clone_url}"
exit 0
fi
# Upload push packets at first
for parcel in $(find -type f -name "*$PARCEL_SUFFIX" -printf '%f\n'); do
api_url="$(get_header_key "${parcel}" api_url)"
if [ -z "${api_url}" ]; then
info "Skip ${parcel}, it is not intended for uploading"
else
info "Push ${parcel} to ${api_url}"
upload "${api_url}?cmd=push" "$(get_hostname ${api_url}).cookie" "${parcel}"
fi
done
# Using cookies from uploaded packets, download master data
while true; do
found=
for cookie in $(find -type f -name '*.cookie'); do
api_url="http://$(basename "${cookie}" .cookie)"
info "Pull updates from ${api_url}"
pull "${api_url}"
found=1
done
[ "${found}" ] || break
done
|
