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


This document describes version 0.12 of File::Copy::Undoable (from Perl distribution File-Copy-Undoable), released on 2017-07-10.




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

Copy file/directory using rsync, with undo support.

On do, will copy source to target (which must not exist beforehand). On undo, will trash target.

Fixed state: source exists 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.

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 can add, for example, --delete or other rsync options.

  • source* => str

  • target* => str

    Target location.

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

  • target_group => str

    Set group of target.

    See target_owner.

  • target_owner => str

    Set ownership of target.

    If set, will do a chmod -Rh on the target after rsync to set ownership. This usually requires super-user privileges. An example of this is copying files on behalf of user from a source that is inaccessible by the user (e.g. a system backup location). Or, setting up user's home directory when creating a user.

    Will do nothing if not running as super-user.

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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