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Re: svnmucc --revision 0 no longer works when creating a file

From: sebb <sebbaz_at_gmail.com>
Date: Thu, 23 Jul 2020 11:18:41 +0100

On Thu, 23 Jul 2020 at 01:17, Daniel Shahaf <d.s_at_daniel.shahaf.name> wrote:
>
> sebb wrote on Wed, 22 Jul 2020 22:34 +0100:
> > On Wed, 22 Jul 2020 at 17:46, Nathan Hartman <hartman.nathan_at_gmail.com> wrote:
> > >
> > > On Wed, Jul 22, 2020 at 12:10 PM sebb <sebbaz_at_gmail.com> wrote:
> > > > > Use the machine-parseable E000042 error codes. That's exactly what
> > > > > they're for. (which-error.py and svn_error_symbolic_name() can be used
> > > > > to convert numbers to symbolic names.)
> > > >
> > > > Where are these error codes defined?
> > > > I could not find any reference to them in the documentation.
> > >
> > > If you mean where in the source code:
> > >
> > > subversion/include/svn_error_codes.h
> > > which is included by subversion/include/svn_error.h, which is further
> > > included by subversion/svnmucc/svnmucc.c.
> > >
> > > Hope that helps,
> >
> > Thanks, but not really.
> >
> > If the error codes are intended to be machine-parseable then the
> > programmer needs to have documentation of the values and their
> > meanings.
> > There needs to be at least a mention in the documentation that such
> > codes exist and where to find the values. If there is such a mention,
> > I could not find it.
>
> Doxygen docs of svn_error_t::apr_err.

But how does one find that information?

> > Also, I had a look at the file and it does not show the numeric
> > values,
>
> I refer you again to which-error.py.

Again, how is one supposed to know about this script?
Also, I assume this requires Python.

> > and whilst there is a text string associated with each one it
> > does not detail when it might be used.
> > Nor indeed do the strings agree with the actual messages generated by
> > SVN as far as I can tell.
>
> No, they don't. The strings in that file are defaults, only used when
> the line of code that raised an error didn't provide a more specific
> string.
>
> > e.g. svn list reports the following:
> >
> > svn: warning: W160013: Path '/x' not found
> > svn: E200009: Could not list all targets because some targets don't exist
>
> Great. Run which-error.py on this and you'll find that the former code
> is SVN_ERR_FS_NOT_FOUND. That's basically the svn API equivalent of
> ENOENT, i.e., "There's no node by that name in the versioned
> filesystem". Therefore, you'll want to write your script to handle
> E160013 errors by ignoring them and continuing.

I would need to know whether E200009 can only be produced when a
target does not exist.
Otherwise it might look like the file does not exist when it does.

> The complication here is that `svn list` supports multiple target
> arguments, and has to handle the case that some but not all of them are
> invalid. It does so by reporting the errors from individual targets as
> W* codes rather than E* codes and adding a generic E200009 error at the
> end. You can either parse stderr despite this complication, or use the
> API directly, in which case you'll sidestep this complication entirely
> (you'll get just one integer, rather than two).

What API are you referring to here?

> Daniel
Received on 2020-07-23 12:19:32 CEST

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