Re: I have end-of-lifed cvsps

From: Jakub Narębski <jnareb@gmail.com>
Date: Dec 17, 2013, 19:58 UTC
Message-ID: <CANQwDwe8AcbCYG5GZcY1tn9BN0x5KWux_CNQY2OWG+qZJ5rS4Q@mail.gmail.com>
In-Reply-To: <20131217140746.GB15010@thyrsus.com>

On Tue, Dec 17, 2013 at 3:07 PM, Eric S. Raymond <esr@thyrsus.com> wrote:

> Jakub Narębski <jnareb@gmail.com>:

Show 8 quoted lines

>> I wonder if we can add support for incremental import once, for all
>> VCS supporting fast-export, in one place, namely at the remote-helper.
>
> Something in the pipeline - either the helper or the exporter - needs to
> have an equivalent of vc-fast-export's and cvsps's -i option, which
> omits all commits before a specified time and generates cookies like
> "from refs/heads/master^0" before each branch root in the incremental
> dump.

Errr... doesn't cvs-fast-export support --export-marks=<file> to save progress and --import-marks=<file> to continue incremental import? I *guess* that 'export' / 'import' capabilities-based remote helpers use 'export-marks <file>' / 'import-marks <file>' capability for incremental import, also known as "fetch", isn't it? But I might be mistaken, I don't know enough about remote helpers...

I would check it in cvs-fast-export manpage, but the page seems to be down:

  http://isup.me/www.catb.org

    It's not just you! http://www.catb.org looks down from here.

Show 6 quoted lines

> This could be done in the wrapper, but only if the wrapper itself
> includes an import-stream parser, interprets the output from the
> exporter program, and re-emits it.  Having done similar things
> myself in reposurgeon, I advise against this strategy; it would
> introduce a level of complexity to the wrapper that doesn't belong
> there, and make the exporter+wrapper combination harder to verify.

Right.

> Fortunately, incremental dump is trivial to implement in the output
> stage of an exporter if you have access to the exporter source code.
> I've done it in two different exporters.  cvs-fast-export now has a
> regression test for this case

This is I guess assuming that information from later commits doesn't change guesses about shape of history from earlier commits...

-- 
Jakub Narebski