[Bug 10540] New: --max-transfer and --create-freespace options for working with limited space

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=10540

           Summary: --max-transfer and --create-freespace options for
                    working with limited space
           Product: rsync
           Version: 3.1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: core
        AssignedTo: wayned at samba.org
        ReportedBy: me at haravikk.com
         QAContact: rsync-qa at samba.org


In order to use options such as --delay-updates etc. it is necessary to ensure
a target file-system has plenty of free space, with rsync unable to do anything
if space runs out, other than to throw error after error. This usually
necessitates either enough capacity that this should never happen, multi-stage
transfers, or pre-flight scripts to guess required space and make sure that
much is free.

What I'd like to propose are two options to give rsync the ability to manage
its requirement for free-space itself, these would be:

--max-transfer, this option sets a limit on how much data rsync will transfer,
once this limit is reached rsync will stop with a soft-error. Use of a
partial-dir is recommended as it allows an incomplete file to be picked up,
while files that did complete within the transfer size window will be moved
into placed as normal.

--create-freespace, this option, when set, tells rsync that it can attempt to
free up space if it runs out. To do-so, it will first perform any pending
deletions (e.g - from --delete-during), before moving delayed updates into
position. If this still leaves it with insufficient free-space then it throw an
error and stop.

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