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Re: [PATCH 03/23] midx: add midx builtin

Hi Derrick,
On Thu, Jun 7, 2018 at 7:03 AM Derrick Stolee <stolee@xxxxxxxxx> wrote:
> This new 'git midx' builtin will be the plumbing access for writing,
> reading, and checking multi-pack-index (MIDX) files. The initial
> implementation is a no-op.

Let's talk about the name for a second:

.idx files are written by git-index-pack or as part of
git-pack-objects (which just calls write_idx_file as part
of finish_tmp_packfile), and the name actually suggests
it writes the index files. I have a hard time understanding
what the git-midx command does[1].

With both commit graph as well as multi index we introduce
a command that is centered around that concept (similar to
git-remote or git-config that are centered around a concept,
that is closely resembled by a file), but for indexes for packs
it was integrated differently into Git. So I am not sure if I want
to suggest to integrate it into the packfile commands as that
doesn't really fit. But maybe we can have a name that is human
readable instead of the file suffix? Maybe

  git multi-pack-index ?

I suppose that eventually this command is not really used by
users as it will be used by other porcelain commands in the
background or even as part of repack/gc so I am not worried
about a long name, but I'd be more worried about understandability.

[1] While these names are not perfect for the layman, it is okay?
  I am sure you are aware of https://git-man-page-generator.lokaltog.net/

> new file mode 100644
> index 0000000000..2bd886f1a2
> --- /dev/null
> +++ b/Documentation/git-midx.txt
> @@ -0,0 +1,29 @@
> +git-midx(1)
> +============
> +
> +----
> +git-midx - Write and verify multi-pack-indexes (MIDX files).

The reading is done as part of all other commands.

> +
> +
> +--------
> +[verse]
> +'git midx' [--object-dir <dir>]
> +
> +-----------
> +Write or verify a MIDX file.
> +
> +-------
> +
> +--object-dir <dir>::
> +       Use given directory for the location of Git objects. We check
> +       <dir>/packs/multi-pack-index for the current MIDX file, and
> +       <dir>/packs for the pack-files to index.
> +
> +

Maybe we could have a SEE ALSO section that points at
the explanation of multi index files?
(c.f. man git-submodule that has a  SEE ALSO
gitsubmodules(7), gitmodules(5) explaining concepts(7)
and the file(5))

But as this is plumbing and users should not need to worry about it
this is optional, I would think.