From: Taylor Blau <me@ttaylorr.com>
To: Jeff King <peff@peff.net>
Cc: Son Luong Ngoc via GitGitGadget <gitgitgadget@gmail.com>,
git@vger.kernel.org, Son Luong Ngoc <sluongng@gmail.com>
Subject: Re: [PATCH] commit-graph: add verify changed paths option
Date: Fri, 31 Jul 2020 14:09:56 -0400 [thread overview]
Message-ID: <20200731180956.GA60133@syl.lan> (raw)
In-Reply-To: <20200731180235.GA846620@coredump.intra.peff.net>
On Fri, Jul 31, 2020 at 02:02:35PM -0400, Jeff King wrote:
> On Fri, Jul 31, 2020 at 07:49:25AM +0000, Son Luong Ngoc via GitGitGadget wrote:
>
> > From: Son Luong Ngoc <sluongng@gmail.com>
> >
> > Add '--has-changed-paths' option to 'git commit-graph verify' subcommand
> > to validate whether the commit-graph was written with '--changed-paths'
> > option.
>
> Is a single boolean flag sufficient? If you have incrementals, you might
> have some slices with this chunk and some without. What should the
> boolean be in that case?
I think you'd really want to know which layers do and don't have
filters. It might be even more interesting to have a tool like what 'git
show-index' is to '*.idx' files, maybe something like 'git show-graph'
or 'git show-commit-graph'. Its output would be one line per commit that
shows:
- what layer in the chain it's located at
- its graph_pos
- its generation number
- whether or not it has a Bloom filter
- ???
That would be a useful tool for debugging anyway, even outside of the
test suite. It would be even better if we could replace the test-tool
with it.
On an unrelated note; this patch is broken as-is, since it will only
report that Bloom filters exist if the top-most graph has them. I have a
patch to fix this that I have been meaning to send out for most of this
week. I'll try to get to it shortly.
> I thought we had some way of reporting the number of commits covered by
> filters, but I can't seem to find it.
I don't recall having anything like that.
> Our "test-tool read-graph" can report on whether there's a bloom filter
> chunk, but I think it also doesn't distinguish between different slices
> (and anyway, it wouldn't be suitable for tools that don't rely on an
> actual built git.git directory).
>
> -Peff
Thanks,
Taylor
next prev parent reply other threads:[~2020-07-31 18:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-31 7:49 [PATCH] commit-graph: add verify changed paths option Son Luong Ngoc via GitGitGadget
2020-07-31 16:21 ` Christian Couder
2020-07-31 17:14 ` Junio C Hamano
2020-07-31 18:06 ` Taylor Blau
2020-07-31 18:02 ` Jeff King
2020-07-31 18:09 ` Taylor Blau [this message]
2020-07-31 19:14 ` Jeff King
2020-07-31 19:31 ` Son Luong Ngoc
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