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Re: commit -> public-inbox link helper

Hi Peff,

On Wed, 4 Apr 2018, Jeff King wrote:

> On Wed, Apr 04, 2018 at 06:35:59PM +0200, Johannes Schindelin wrote:
> > I found myself in dear need to quickly look up mails in the public-inbox
> > mail archive corresponding to any given commit in git.git. Some time ago,
> > I wrote a shell script to help me with that, and I found myself using it a
> > couple of times, so I think it might be useful for others, too.
> > 
> > This script (I call it lookup-commit.sh) needs to be dropped into a *bare*
> > clone of http://public-inbox.org/git, and called with its absolute or
> > relative path from a git.git worktree, e.g.
> > 
> > 	~/public-inbox-git.git/lookup-commit.sh \
> > 		fea16b47b603e7e4fa7fca198bd49229c0e5da3d
> > 
> > This will take a while initially, or when the `master` branch of the
> > public-inbox mirror was updated, as it will generate two files with
> > plain-text mappings.
> Junio publishes a git-notes ref with the mapping you want. So you can
> do:
>   git fetch git://github.com/gitster/git.git refs/notes/amlog:refs/notes/amlog
>   mid=$(git notes --ref amlog show $commit | perl -lne '/<(.*)>/ and print $1')
>   echo "https://public-inbox.org/git/$mid";
> without having to download the gigantic list archive repo at all (though
> I do keep my own copy of the archive and index it with mairix, so I can
> use "mairix -t m:$mid" and then view the whole thing locally in mutt).

Good to know! Thanks for the script.

And thanks also for the `--ref` trick: I had a look at the man page of
git-notes, and it was not immediately obvious that it supports options
before the sub-subcommand. The `--ref` description is buried pretty deep
in there.