masy/syncloop.sh

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#!/bin/bash
# Copyright 2021 Luca Paris
#This file is part of masync.
#masync 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.
#masync 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 masync. If not, see <http://www.gnu.org/licenses/>.
## REQUIREMENT
# apt-get install inotify-tools
# @1 hash to retrieve sync
# @2 local path to sync
# @3 remote path to sync
#echo "$1, $2, $3"
source ~/bin/.synccmd.sh
TMPQUEUEFILE=~/.syncdir_$1.queue
TMPQUEUEDELETES=~/.syncdir_$1.deletes
LOCALPATH_HASH=$1
LOCALPATH=$2
REMOTEPATH=$3
REMOTEHOST=$(echo "$REMOTEPATH" | cut -d : -f 1 | cut -d @ -f 2)
REMOTERELATIVEPATH=$(echo "$REMOTEPATH" | cut -d : -f 2)
#acquire lock_deletes file descritptor
exec {lock_deletes}>>${TMPQUEUEDELETES}
#acquire lock queue file descriptor
exec {lock_queue}>>${TMPQUEUEFILE}
synccycle() {
lastsynctime="$(date -u +%s.%N)"
### max waiting time for pull (seconds)
maxpulllimit=60
while :
do
if [ -f "$TMPQUEUEFILE" ] || [ -f "$TMPQUEUEDELETES" ]; then
### DELETES WHILE LOOP
if [ -f "$TMPQUEUEDELETES" ]; then
ndeletes=$(wc -l < ${TMPQUEUEDELETES})
while [ $ndeletes -gt 0 ]; do
echo "consume ${ndeletes} deletes"
echo "remote deletes: $(head -n $ndeletes ${TMPQUEUEDELETES} | tr '\n', ' ')"
ssh $REMOTEHOST "rm -rf $(head -n $ndeletes ${TMPQUEUEDELETES} | tr '\n', ' ')"
# remove the first ndeletes lines
flock $lock_deletes
tmpfile=$(mktemp)
tail -n +$(expr ${ndeletes} + 1) < ${TMPQUEUEDELETES} > ${tmpfile}
cat ${tmpfile} > ${TMPQUEUEDELETES}
rm -f ${tmpfile}
flock -u $lock_deletes
ndeletes=$(wc -l < ${TMPQUEUEDELETES})
echo "ndeletes: $ndeletes"
done
fi
### PUSH WHILE LOOP
if [ -f "$TMPQUEUEFILE" ]; then
nqueue=$(wc -l < ${TMPQUEUEFILE})
while [ $nqueue -gt 0 ]; do
echo "${TMPQUEUEFILE} not empty consume ${nqueue} updates in queue"
sync $LOCALPATH_HASH $LOCALPATH $REMOTEPATH
# remove the first nqueue lines from queue
flock $lock_queue
tmpfile=$(mktemp)
tail -n +$(expr ${nqueue} + 1) < ${TMPQUEUEFILE} > ${tmpfile}
cat ${tmpfile} > ${TMPQUEUEFILE}
rm -f ${tmpfile}
flock -u $lock_queue
lastsynctime="$(date -u +%s.%N)"
nqueue=$(wc -l < ${TMPQUEUEFILE})
done
fi
fi
now="$(date -u +%s.%N)"
elapsed="$(bc <<<"$now-$lastsynctime")"
## if elapsed is greater than maxpulllimit sync from remote with delete option
if [ 1 -eq $(echo "$elapsed>$maxpulllimit" | bc) ]; then
echo 'maxpulllimit reached: sync from remote with --delete option'
sync $LOCALPATH_HASH $REMOTEPATH $LOCALPATH '--delete'
lastsynctime="$(date -u +%s.%N)"
fi
done
}
synccycle &
# exclude swp,swpx and 4913 files created by vim
inotifywait -m -r -e create -e close_write -e move -e delete --exclude "\.swp|\.swx|4913|.txt~" $LOCALPATH | while read dir action file; do
if [ $action = 'DELETE' ] || [ $action = 'DELETE,ISDIR' ]; then
echo "Enqueue delete: $dir$file"
flock $lock_deletes
echo $dir$file | sed -e "s~$LOCALPATH~$REMOTERELATIVEPATH~g" | tee -a ${TMPQUEUEDELETES}
flock -u $lock_deletes
else
flock $lock_queue
echo "Add notify to queue: file '$file' in directory '$dir' for '$action'" | tee -a ${TMPQUEUEFILE}
flock -u $lock_queue
fi
done