NAME
File::Prepend::Undoable - Prepend string to a file, with undo support
VERSION
This document describes version 0.02 of File::Prepend::Undoable (from
Perl distribution File-Prepend-Undoable), released on 2014-05-17.
FUNCTIONS
prepend(%args) -> [status, msg, result, meta]
Prepend string to a file, with undo support.
On do, will trash file, copy it to original location (with the same
permission and ownership as the original) and prepend the string to the
beginning of file. On undo will trash the new file and untrash the
original.
Some notes:
* Chown will not be done if we are not running as root.
* Symlink is currently not permitted.
* Since transaction requires the function to be idempotent, in the
"check_state" phase the function will check if the string has been
prepended. It will refuse to prepend the same string twice.
* Take care not to use string that are too large, as the string, being
a function parameter, is entered into the transaction table.
Fixed state: file exists and string has been prepended to beginning of
file.
Fixable state: file exists and string has not been prepended to
beginning of file.
Unfixable state: file does not exist or path is not a regular file
(directory and symlink included).
This function is idempotent (repeated invocations with same arguments
has the same effect as single invocation). This function supports
transactions.
Arguments ('*' denotes required arguments):
* path* => *str*
The file to prepend.
* string* => *any*
The string to prepend to file.
Special arguments:
* -tx_action => *str*
For more information on transaction, see Rinci::Transaction.
* -tx_action_id => *str*
For more information on transaction, see Rinci::Transaction.
* -tx_recovery => *str*
For more information on transaction, see Rinci::Transaction.
* -tx_rollback => *str*
For more information on transaction, see Rinci::Transaction.
* -tx_v => *str*
For more information on transaction, see Rinci::Transaction.
Return value:
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.
SEE ALSO
Rinci::Transaction
HOMEPAGE
Please visit the project's homepage at
<https://metacpan.org/release/File-Prepend-Undoable>.
SOURCE
Source repository is at
<https://github.com/sharyanto/perl-File-Prepend-Undoable>.
BUGS
Please report any bugs or feature requests on the bugtracker website
<https://rt.cpan.org/Public/Dist/Display.html?Name=File-Prepend-Undoable
>
When submitting a bug or request, please include a test-file or a patch
to an existing test-file that illustrates the bug or desired feature.
AUTHOR
Steven Haryanto <stevenharyanto@gmail.com>
COPYRIGHT AND LICENSE
This software is copyright (c) 2014 by Steven Haryanto.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.