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Date: Thu, 29 Dec 2016 11:23:22 +0200
From: Lars Wirzenius <liw@liw.fi>
To: Paul Waring <paul@xk7.net>
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Subject: Re: Improving error message when restoring on a different client
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On Wed, Dec 28, 2016 at 08:35:45PM +0000, Paul Waring wrote:
> I recently tried restoring backups of client A on another machine B using
> the following command from the obnam documentation.
>=20
> obnam mount -r /path/to/repository --to ~/restore/
>=20
> The error message I received was:
>=20
> ERROR: R24424X: Repository client B does not exist
>=20
> I had no idea what R24424X was or why obnam would be telling me that clie=
nt
> B didn't exist when I wanted to restore client A (I keep one client per
> repository, which may not be a typical use case).
The R.....X codes are Obnam's error codes. They're reasonably stable
and automatically generated. It's there to make it easier to grep for
errors. Some day it'll be useful to understand log files from users
who use a non-English locale, as the error code will be unchanged.
See obnamlib/structurederror.py for details. In short, each error
message is a class (subclass of obnamlib.StructuredError) and the
class contains the error text (or template).
The manual has an automatically generated list of error codes and
message:
http://code.liw.fi/obnam/manual/ci/obnam-manual.en.html#appendix-error-mess=
ages
This particular error message is "generic", i.e., used for all obnam
commands that need to access the repository as a client, but the
client name isn't found (possibly becuase, as in your case, the
client name is automatically chosen from the computer hostname, and
the user didn't know about it). Thus, I'd like the error message text
to be suitable for them. Possibly something like:
"Client B does not exist in the repository. Use --client-name A to
choose client name, and 'obnam clients' to see which exist."
Improving the manual would be a good thing as well.
> Alternatively, perhaps it might be worth documenting the use of
> --client-name in the 'Restoring from backups' section of the manual? I am
> happy to improve the docs, but I have no idea where to start with the cod=
e.
Patch for error messsage or manual or both warmly welcome. Thank you.
--=20
I want to build worthwhile things that might last. --joeyh
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