csync talk at SambaXP 2009

Terminology and Concept Roaming Home Directories Plans for the future

Roaming Home Directories

Andreas Schneider <mail@cynapses.org>

23rd April 2009

Andreas Schneider <mail@cynapses.org> csync

1 Terminology and ConceptTerminologyConcept

2 Roaming Home DirectoriesPAMpam csync

3 Plans for the futureFeatures users or developers asked for

Terminology

csync - roaming home directories

Terminology

We don’t talk about Profiles here

This is about synchronizing files!

No merging of content (not yet?)

Terminology

What is a replica?

A tree or subtree of a filesystems

This could be local or remote

Changes are often made independently and as a result they donot contain the same information.

Terminology

What is a conflict?

A path is conflicting if it fulfills the following conditions:

1 it has been updated on one replica

2 it or any of its decendants has been updated on the otherreplica too, and

3 its contents are not identical.

Concept

What do we need?

We need a bidirectional file synchronizer

working with metadata (stat())

working with a metadata status database

client only (no specific daemon needed)

Concept

What do we have?

csync simple file synchronizer which:

collects and checks metadata (update detection)

compares metadata (reconciliation)

copy the files (propagation)

Concept

How do we detect updates?

We compare the modification time of the file with the db entry.

no entry = new file

newer modification time = file changed

equal modification time = no changes

Concept

What do we do with conflicts?

The Merge Algorithm

doesn’t need any user interaction

it is used by Microsoft for Roaming Profiles

if it detects a conflict, it will use the most recent file andoverwrite the file on the other replica

Concept

Which protocols are supported?

SMB: using Sambas libsmbclient

SFTP: using libssh (will be in 0.43)

Concept

For developers

csync uses:

a red-black tree to store all information in memory

a sqlite3 database to store all the metadata for the nextsynchronization

a virtual IO plugin system to support different protocols

a unit testing framework

Pluggable Authentication Module

Separates the tasks of authentication into four independentmanagement groups:

authentication management

password management

account management

session management

pam csync

pam csync does ...

authentication management to get the password and pass it to

session management to synchronize the files

pam csync

pam csync features

pam winbind support to get the Profile directory from theADS

kerberos suppport

exclude users

Features users or developers asked for

GUI support

What’s needed?

A conflict algorithm

Callback that for the GUI to display and modify conflicts

More protocols

WEBDAV: maybe possible with libneon

RSYNC: maybe we can talk to rsync

own daemon with mimetype support to merge special contents

Questions & Answers

Interested in development?

Poject page: http://www.csync.org/

csync talk at SambaXP 2009

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