[rdiff-backup-users] create-full-path patch

[Keith Edmunds]

Hi all

The attached patch adds a "--create-full-path" option to rdiff-backup; the
patch is against version 0.13.4.

I like to maintain the backup tree as a mirror of the client system,
but I don't want to back up every directory. For example, I may want to
back up/var/lib/cvs without backing up the entire /var tree. In the past
this could be achieved with include/exclude options, but it is difficult to
maintain as other directories may be created under /var. If the command

        rdiff-backup /var/lib/cvs remotesys::/backups/var/lib/cvs

is issued, it is necessary for the directory /backups/var/lib to exist
remotely. The new option will create the full path if required:

        rdiff-backup --create-full-path /var/lib/cvs \
                remotesys::/backups/var/lib/cvs

This should be used with caution: if there is a typo in the remote path the
remote filesystem could fill up very quickly (by creating a duplicate
backup tree). For this reason this option is primarily aimed at scripts
which automate backups.

Comments, patches-to-patch, etc, welcome.

Keith

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