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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
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<one line to give the program's name and a brief idea of what it does.>
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
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This is free software, and you are welcome to redistribute it
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The hypothetical commands `show w' and `show c' should show the appropriate
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For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
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may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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GNUpot
======
Yet another libre Dropbox clone (only for the right aspects) written in bash.
###Purpose of this project
Lots of us using Dropbox (or similar) like its functionalities. However
these services have some defects:
- Your data could be anywhere in the world.
- This means you don't have full control over your own files.
- Size limits
- Usually of a few Gigabytes.
- Clients used to access these servces are usually proprietary.
- These program are also heavy (in terms of disk, memory and processor usage).
- What are you going to do if those *owners* close the services?
The aim of this project is to have a completely free (as in freedom)
replacement for Dropbox (and also similar services) that runs exclusively in
our computers. All of this is done following the *K-I-S-S* (Keep It Simple,
Stupid) principal.
**ANY HELP IN CONTRIBUTING TO THIS PROJECT IS WARMLY WELCOMED.**
**LOTS OF DEVELOPMENT IS NEEDED.**
###Why the name GNUpot
**GNU** beause of the freedom associated to this program.
**pot** because it gives the idea of some type of container.
###Ideas behind the project
- Simple.
- Use of `bash` as scripting language makes the program overall very
integraded with a GNU/Linux system (as well as other UNIX-like systems).
- Programming and manteinance should also be trivial this way.
- When some kind of change is made, this is sent automatically to the server
(or to the clietn).
- This is possible with `inotify` to look for changes inside the watch
directories both on client and on server.
- Encrypted and passord-less communication between client and server.
- `ssh` is very suitable and malleable for this job. **SOME TODO.**
- Minimal bandwidth usage.
- If we are setting up a server at home it is unlikely to have fast upload
speed. We have to avoid to use all available upload (and even download
bandwidth) on server side (especially).
- Desktop notifications.
- When an event is originated (either on client or on server) user must be
notified. The command `inotify-send` is perfect for this because of its
simplicity.
- Solid syncing agent.
- `rsync` would be grat for this but it is only designed for mirroring. We
need something more sophistiated like `usinon`. I don't know yet if `git`
would be better. **WORK IN PROGERSS.**
- Automatic collision detection and resolution. **WORK IN PROGRESS**.
- Automatic backup to a maximum user defined number of backups. **TODO**
- Easily shareble directories.
- User and groups are managed by simple text files on the server. **TODO.**
- No server-side program running.
- Only programs like `inotify` and `unison` needs to be installed on the
server. **WORK IN PROGRESS**.
##WARNING
THIS IS A WORK IN PROGESS. DON'T EXPECT THAT IT WORKS OUT OF THE BOX.
###Howto
At this early stage:
- Edit `gnupot.config` based on your needs.
- Be sure to have an ssh server up and running.
- Install the packets described below.
- Create local and remote directories.
###Packets to install (dependencies)
- bash 4.3.033-1
- Server and client.
- openssh 6.8p1-2
- Server and client.
- inotify-tools 3.14-4 (inotifywait) [Tells the script that some changes have
been made to a certain file.]
- Server and client
- util-linux 2.26.1-3 (flock) [Locks script and avoids contemporary local and
remote sync.]
- Client only.
- libnotify 0.7.6-1 (notify-send) [Sends notifications to notification server.]
- Client only.
- Be sure to have 1 and only 1 notify server installed. It should be already
installed on your system.
#dunst () [Lightweight notification server; it displays notifications.]
- Client only.
- unison (at this moment).
- Server and client.
##Contact
franco.masotti@live.com or franco.masotti@student.unife.it

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#!/bin/bash
#
# gnupot
#
# Copyright (C) 2015 frnmst (Franco Masotti) <franco.masotti@live.com>
# <franco.masotti@student.unife.it>
#
# This file is part of GNUpot.
#
# GNUpot 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.
#
# GNUpot 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 GNUpot. If not, see <http://www.gnu.org/licenses/>.
#
# Enable automatic export of all variables form now on.
# This avoids putting "export" in front of every variable.
set -a
# Set path.
PATH="$PATH":/usr/bin
# Flock so that script is not executed more than once.
# See man 1 flock (examples section).
[ "${FLOCKER}" != "$0" ] && exec env FLOCKER="$0" flock -en "$0" "$0" "$@" || :
# Load configuration.
if [ -f "gnupot.config" ]; then
source gnupot.config
fi
# Define unison env variable so that archive files go there.
# Do this for server also.
UNISON=""$gnupotLocalDir"/.unison"
# Create unison directory.
mkdir -p ""$gnupotLocalDir"/.unison"
# Macros.
# Add -i <public key> as explicit parameter.
SSHCONNECTCMDARGS="-S "$gnupotSSHMasterSocketPath" \
"$gnupotServerUsername"@"$gnupotServer""
# Open master socket so that further connection will result faster
# (using multiplexing to avoid re-authentication).
SSHMASTERSOCKCMDARGS="-M -o \
ControlPersist="$gnupotSSHMasterSocketTime" \
$SSHCONNECTCMDARGS exit"
# inotifywait command macro: recursive, quiet, listen only to certain events.
# Check --exclude switch which is not working yet.
INOTIFYWAITCMD="inotifywait -r -q -e modify -e attrib \
-e move -e move_self -e create -e delete -e delete_self \
--exclude '(.unison*)'"
# POSSIBLE SOLUTION TO MERGE PROBLEM IN THE FIRST POST HERE:
# http://permalink.gmane.org/gmane.network.unison.general/9400
function writeCommonUnisonConfigFile ()
{
# Common config for server and client profiles.
echo -en "\
auto = true
batch = true\n\
retry = 2
merge = Path * -> mv CURRENT1 CURRENT1."$USER"."$HOSTNAME".$(date "+%s") \
&& cp CURRENT2 CURRENT2."$USER"."$HOSTNAME".$(date "+%s")\n\
confirmbigdel = false
maxthreads = 1\n\
times = true\n\
sshargs = -C -S "$gnupotSSHMasterSocketPath"\n\
ignore = Path .unison*\n\
" > ""$UNISON"/gnupotCommonProfile"
return
}
function writeS2CUnisonConfigFile ()
{
# Server to client.
echo -en "\
root = ssh://"$gnupotServerUsername"@"$gnupotServer"/"$gnupotRemoteDir"\n\
root = "$gnupotLocalDir"\n\
include gnupotCommonProfile\n\
" > ""$UNISON"/gnupotS2CProfile"
return
}
function writeC2SUnisonConfigFile ()
{
# Client to server.
echo -en "\
root = "$gnupotLocalDir"\n\
root = ssh://"$gnupotServerUsername"@"$gnupotServer"/"$gnupotRemoteDir"\n\
include gnupotCommonProfile\n\
" > ""$UNISON"/gnupotC2SProfile"
return
}
# Function that writes profile files for unison.
function writeUnisonConfigFile ()
{
writeCommonUnisonConfigFile
writeS2CUnisonConfigFile
writeC2SUnisonConfigFile
return
}
function cleanRemoteUnsionArchiveFiles ()
{
ssh $SSHCONNECTCMDARGS \
"if [ -d ""$gnupotRemoteHome"/.unison" ]; then \
rm ""$gnupotRemoteHome"/.unison/\*"; fi; exit" 2>&-
return
}
function cleanLocalUnsionArchiveFiles ()
{
if [ -d "$UNISON" ]; then
rm "$UNISON"/*[^gnupot]
fi
return
}
# General notification function.
function notifyCmd ()
{
msg="$1"
ms="$2"
notify-send -t "$ms" "$msg"
return
}
function syncNotify ()
{
path="$1"
dir="$2"
source="$3"
notifyCmd "GNUpot syncing $(getRelativePath "$path" \
"$dir") from "$source"" "$gnupotDefaultNotificationTime"
return
}
# Get relative path for local files.
# TODO better.
function getRelativePath ()
{
fullPath="$1"
srcDir="$2"
tmp=""
# Get relative path of file.
tmp="${fullPath##$"$srcDir"}"
# Remove heading slash and return value.
echo "${tmp:1}"
return
}
# Main file syncronization function.
# This is executed inside a critical section.
function syncOperation ()
{
source="$1"
path="$2"
unisonExitCode=0
sleep "$gnupotTimeToWaitForOtherChanges"
syncNotify "$path" "$gnupotLocalDir" "$source"
if [ "$source" == "client" ]; then
unison gnupotC2SProfile
unisonExitCode=$?
else
# unison gnupotS2CProfile
:
fi
# Check if unsion executed correctly or not.
case "$unisonExitCode" in
# OK.
0 )
notifyCmd "Done." "$gnupotDefaultNotificationTime"
;;
# Clear inconsistent state.
3 )
cleanRemoteUnsionArchiveFiles
cleanLocalUnsionArchiveFiles
;;
esac
return
}
# Server sync thread.
function syncS ()
{
# return/exit when signal{s} is/are received.
trap "return" SIGINT SIGTERM
# Open master ssh socket.
ssh $SSHMASTERSOCKCMDARGS 2>&-
while true; do
# Listen for changes on server
path=$(ssh $SSHCONNECTCMDARGS "$INOTIFYWAITCMD" \
"$gnupotRemoteDir" | awk ' { print $1 $3 } ')
# Open a subshell for critical section.
(
# While not acquire lock:
# while [ ! flock -n 1024 ]; do :; done
# is the same as the following line:
flock -x "$FD"
syncOperation "server" "$path"
# End critical section.
) {FD}>>.lockfile
# Get first valid file descriptor from a bash builtin.
done
}
# Client sync thread.
function syncC ()
{
trap "return" SIGINT SIGTERM
while true; do
path=$($INOTIFYWAITCMD "$gnupotLocalDir" \
| awk ' { print $1 $3 } ')
(
flock -x "$FD"
syncOperation "client" "$path"
) {FD}>>.lockfile
done
}
# Signal handler function.
function sigHandler ()
{
echo -en "GNUpot killed\n" 1>&2
# Kill master ssh socket (this will kill any ssh connection associated
# with it). Also disable stderr output for this command with "2>&-".
ssh -O exit -S "$gnupotSSHMasterSocketPath" "$gnupotServer" 2>&- &
# Kill all the processes of this group.
kill -s SIGINT 0
return
}
# Clean before exiting.
function clean ()
{
# Wait for client and server threads before exiting.
wait "$srvPid" "$cliPid"
return
}
# Main function that runs in background.
function main ()
{
# Enable signal interpretation to kill all subshells
trap "sigHandler" SIGINT SIGTERM
notifyCmd "GNUpot starting..." "$gnupotDefaultNotificationTime"
writeUnisonConfigFile
# Listen from server and send to client.
syncS &
srvPid="$!"
# Listen from client and send to server.
syncC &
cliPid="$!"
clean
notifyCmd "GNUpot stopped..." "$gnupotDefaultNotificationTime"
return
}
# Call main function as spawned shell (execute and return control to the
# shell).
main &
exit 0

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# GNUpot configuration file.
# Required parameters.
gnupotServer="<addr or hostname>"
gnupotServerUsername="<remote username>"
gnupotLocalDir="<full path local watch dir>"
gnupotRemoteDir="<remote watch dir>"
gnupotLocalHome="<full path local home dir>"
gnupotRemoteHome="<full path remote home dir>"
# Other parameters.
gnupotTimeToWaitForOtherChanges="10"
gnupotSSHMasterSocketPath="/tmp/gnupotSSHMasterSocket"
gnupotSSHMasterSocketTime="120m"
gnupotDefaultNotificationTime="2000"