Re: File based incremental backup v6

Hi,

here it is another version of the file based incremental backup patch.

Changelog from the previous one:

* pg_basebackup --incremental option take the directory containing the
base backup instead of the backup profile file
* rename the backup_profile file at the same time of backup_label file
when starting the first time from a backup.
* handle "pg_basebackup -D -" appending the backup profile to the
resulting tar stream
* added documentation for -I/--incremental option to pg_basebackup doc
* updated replication protocol documentation

The reationale of moving the backup_profile out of the way during
recovery is to avoid using a data directory which has been already
started as a base of a backup.

I've also lightly improved the pg_restorebackup PoC implementing the
syntax advised by Gabriele:

./pg_restorebackup.py DESTINATION BACKUP_1 BACKUP_2 [BACKUP_3, ...]

It also supports relocation of tablespace with -T option.
The -T option is mandatory if there was any tablespace defined in the
PostgreSQL instance when the incremental_backup was taken.

Regards,
Marco

--
Marco Nenciarini - 2ndQuadrant Italy
PostgreSQL Training, Services and Support
marco(dot)nenciarini(at)2ndQuadrant(dot)it | www.2ndQuadrant.it