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https://github.com/michaelaquilina/s4

:arrows_counterclockwise: Fast and cheap synchronisation of files using Amazon S3
https://github.com/michaelaquilina/s4

aws python3 s3 sync synchronization

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:arrows_counterclockwise: Fast and cheap synchronisation of files using Amazon S3

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README 

        
==============

S4 = S3 Syncer

==============



|CircleCI| |CodeCov| |Black| |PyPi| |GPLv3|



Fast and cheap synchronisation of files using `Amazon

S3 `__.



S4 stands for "Simple Storage Solution (S3) Syncer".



The intention of this project is to be an open source alternative to

typical proprietary sync solutions like Dropbox. Because S4 interacts

with S3 directly, you can expect *very* fast upload and download speeds

as well as *very* cheap costs (See `Amazon S3

Pricing `__ for an idea of how much

this would cost you). See `Why?`_ for further motivation for this project.



You can also take advantage of other cool features that S3 provides like

`versioning `__.

Everytime you sync a version of a new file, you will now have the

ability to easily rollback to any previous version.



* Requirements_

* Installation_

* Setup_

* Synchronising_

* `Handling Conflicts`_

* `Other Subcommands`_

* `How S4 Works`_

* `Ignoring Files`_

* `Why?`_

* Contributing_



See it in action here:



|ASCIINEMA|



Requirements

------------



S4 requires python 3.5+ to work



Installation

------------



The easiest way to install S4 is through pip:



::



    $ pip install s4



You will need ``libmagic`` installed.

This is installed by default on most linux distributions but on MacOSX you need to install it with brew as follows:



::



    brew install libmagic



Setup

-----



Run ``s4 add`` to add a new sync local folder and target S3 uri:



::



    $ s4 add

    local folder: /home/username/myfolder1

    s3 uri: s3://mybucket/folder1

    AWS Access Key ID: AKIAJD53D9GCGKCD

    AWS Secret Access Key:

    region name: eu-west-2

    Provide a name for this entry [myfolder1]:



Synchronising

-------------



Run ``s4 sync`` in the project directory to synchronise the local

folders you specified with the folders in the bucket.



::



    $ s4 sync

    Syncing myfolder1 [/home/username/myfolder1/ <=> s3://mybucket/folder1/]

    Creating foobar.jpg (/home/username/myfolder1/ => s3://mybucket/folder1/)

    Creating boarding-pass.pdf (/home/username/myfolder1/ => s3://mybucket/folder1/)

    Flushing Index to Storage



All files will be automatically synced between the source and target

destinations where possible.



You may specify a specific folder to synchronise by the name you

provided during ``add``.



::



    $ s4 sync myfolder1



If you wish to synchronise your targets continuously, use the ``daemon`` command:



::



    $ s4 daemon myfolder1



NOTE: This command is only supported on machines that can run INotify. This typically means

Linux based operating systems.



Handling Conflicts

------------------



In the case where S4 cannot decide on a reasonable action by itself, it

will ask you to intervene:



::



    Syncing /home/username/myfolder1/ with s3://mybucket/folder1/



    Conflict for "test.txt". Which version would you like to keep?

       (1) /home/username/myfolder1/test.txt updated at 2017-01-23 12:26:24 (CREATED)

       (2) s3://mybucket/folder1/test.txt updated at 2017-01-23 12:26:30 (CREATED)

       (d) View difference (requires diff command)

       (X) Skip this file



    Choice (default=skip):



If you do not wish to fix the issue, you can simply skip the file for

now.



Other Subcommands

-----------------



Some other subcommands that you could find useful:



-  ``s4 targets`` - print existing targets

-  ``s4 edit`` - edit the settings of a targets

-  ``s4 rm`` - remove a target

-  ``s4 ls`` - print tracked files and metadata of a target



Use the ``--help`` parameter on each subcommand to get more details.



How S4 Works

------------



S4 keeps track of changes between files with a ``.index`` file at

the root of each folder you are syncing. This contains the keys of each

file being synchronised along with the timestamps found locally and

remotely in JSON format.



This is compressed (currently using gzip) to save space and increase

performance when loading.



If you are curious, you can view the contents of an index file using the

``s4 ls`` subcommand or you can view the file directly using a command

like ``zcat``.



    NOTE: Deleting this file will result in that folder being treated as if

    it was never synced before so make sure you *do not* delete it unless

    you know what you are doing.



All information about your configuration (such as targets, your keys etc..) are

stored in a JSON formatted file under ``~/.config/s4/sync.conf``.



Ignoring Files

--------------



Create a ``.syncignore`` file in the root of the directory being synced

to list patterns of subdirectories and files you wish to ignore. The

``.syncignore`` file uses the exact same pattern that you would expect

in ``.gitignore``. Each line specifies a `GLOB

pattern `__ to

ignore during sync.



Note that if you add a pattern which matches an item that was previously

synced, that item will be deleted from the target you are syncing with

next time you run S4.



Why?

----



There are a number of open source S3 backup tools out there - but none of them really satisfied the

requirements that this project tries to solve.



Here are is a list of open source solutions that I have tried in the past.



* ``s3cmd``: Provides a sync function that works very well for backing up - but stops working correctly

  as soon as there is second machine you want to sync to S3.



* ``owncloud/nextcloud``: Requires you to setup a server to perform your syncing. In terms of costs on AWS,

  this quickly becomes costly compared with just using S3. The speed of your uploads and downloads are also

  heavily bottlenectked by the network and hardware performance of your ec2 instance.



* ``seafile``: suffers from the same problem as owncloud/nextcloud.



* ``duplicity``: great backup tool, but does not provide a sync solution of any kind.



Contributing

------------



Pull requests are welcome! Make sure you pass all the tests, CircleCI will tell you if you don't ;)



When opening a pull request, please make sure it is from a separate branch in your fork.



.. |CircleCI| image:: https://circleci.com/gh/MichaelAquilina/S4.svg?style=svg

   :target: https://circleci.com/gh/MichaelAquilina/S4



.. |PyPi| image:: https://badge.fury.io/py/s4.svg

   :target: https://badge.fury.io/py/s4



.. |CodeCov| image:: https://codecov.io/gh/MichaelAquilina/s4/branch/master/graph/badge.svg

   :target: https://codecov.io/gh/MichaelAquilina/s4



.. |GPLv3| image:: https://img.shields.io/badge/License-GPL%20v3-blue.svg

   :target: https://www.gnu.org/licenses/gpl-3.0



.. |ASCIINEMA| image:: https://asciinema.org/a/0GiXLN7YT4ki8qouedF0w8Wbk.png

   :target: https://asciinema.org/a/0GiXLN7YT4ki8qouedF0w8Wbk?autoplay=1



.. |Black| image:: https://img.shields.io/badge/code%20style-black-000000.svg

   :target: https://github.com/ambv/black