File::Move::Undoable - Move file/directory using rename/rsync, with undo support


This document describes version 0.09 of File::Move::Undoable (from Perl distribution File-Move-Undoable), released on 2017-07-10.




 mv(%args) -> [status, msg, result, meta]

Move file/directory using rename/rsync, with undo support.

If moving to the same filesystem, will move using rename(). On undo will restore the old name.

If moving to a different filesystem, will copy to target using rsync and then trash source. On undo, will trash target and restore source from trash.

Fixed state: source does not exist and target exists. Content or sizes are not checked; only existence.

Fixable state: source exists and target doesn't exist.

Unfixable state: source does not exist, or both source and target exist (unless we are moving to a different filesystem, in which it means an interrupted transfer and thus fixable).

This function is not exported.

This function is idempotent (repeated invocations with same arguments has the same effect as single invocation). This function supports transactions.

Arguments ('*' denotes required arguments):

  • rsync_opts => array[str] (default: ["-a"])

    Rsync options.

    By default, -a is used. You should not use rsync options that modify or destroy source, like --remove-source-files as it will make recovery of interrupted move impossible.

  • source* => str

  • target* => str

    Target location.

    Note that to avoid ambiguity, you must specify full location instead of just directory name. For example: mv(source=>'/dir', target=>'/a') will move /dir to /a and mv(source=>'/dir', target=>'/a/dir') will move /dir to /a/dir.

Special arguments:

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (result) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)


Why do you use rsync? Why not, say, File::Copy::Recursive?

With rsync, we can continue interrupted transfer. We need this ability for recovery. Also, rsync can handle hardlinks and preservation of ownership, something which File::Copy::Recursive currently does not do. And, being implemented in C, it might be faster when processing large files/trees.


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