Changes

Process backup and restore for students' Journals. The service is listenning for HTTP requests that client send before starting backup. If server accepts requests, clients start Rsync'ing Journal data via SSH.

Process backup and restore for students' Journals. The service is listenning for HTTP requests that client send before starting backup. If server accepts requests, clients start Rsync'ing Journal data via SSH.

Note, this backup functionality does not compatible with client tools that work with OLPC XS. The problem is that these tools construct backup url on a client side (using only server host name from backup url given after registration on a server) with relying that every client has its own system user on a server side. That doesn't work with new backup functionality where there is only one system user on a client side and authorisation happens on SSH level (using {{Code|command}} option in {{Code|~/.ssh/authorized_keys}} file).

Note, this backup functionality does not compatible with client tools that work with OLPC XS. The problem is that these tools construct backup url on a client side (using only server host name from backup url given after registration on a server) with relying that every client has its own system user on a server side. That doesn't work with new backup functionality where there is only one system user on a server side and authorisation happens on SSH level (using {{Code|command}} option in {{Code|~/.ssh/authorized_keys}} file).

==== Interface ====

==== Interface ====