Re: Need help for migration from CVS to git in one go (ie, FORGETTING CVS history)

From: Francis Galiegue <fg@one2team.net>
Date: Nov 6, 2008, 12:13 UTC
Message-ID: <200811061313.50711.fg@one2team.net>
In-Reply-To: <m3zlkdeelm.fsf@localhost.localdomain>

Le Thursday 06 November 2008 04:08:16 Jakub Narebski, vous avez écrit : Hello, [...]

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> >
> > * 52 CVS modules, fine; but then this can become one and 52
> >   subdirectories in them and still act as separate modules from
> >   the build system point of view (which I have implemented, so
> >   I can change it);
>
> I think that those CVS modules should become separate repositories,
> perhaps joined together using submodules. This is one of more
> difficult things during conversion.
>
> Note that in Git commits are always whole tree (whole project)
> commits.
>

Honestly, I'm not fond of this approach. The problem with submodules as far as I'm concerned is that documentation is "not really there", and (unless the README of egit is _really_ outdated) that there's no support in egit.

I know about commits affecting the whole tree, and even branches and tags, and that's more of an advantage to my eyes, for two reasons:

* 99+% of queries currently done on the CVS tree (with Bonsai) cover all 
modules; only rarely is a single module concerned, and in this case you just 
fill in the appropriate field in the search page anyway;
* creating a branch is one command and that's it. It may also be one command 
with submodules, but again, the documentation makes me uncomfortable; with 
CVS, well... You get the picture.

What's more, I don't think we have the requirement of making specific per-module tags. Not as far as this has been discussed so far, anyway, and not as far as the history shows.

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> > * second: even though this may be a "non problem", we use Bonsai,
> > which has the ability to see what was commited by whom, given a time
> > interval (from d1 to d2): the base gitweb allows to search by
> > commiter, which is good, but it has no date boundaries: do tools
> > exist for git that can do this? If not, that wouldn't be a big deal,
> > however...
>
> First, there are more web interfaces than gitweb, see
> http://git.or.cz/gitweb/InterfacesFrontendsAndTools
>

Yep, I've yet to try those... There are quite a few!

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> Second, you can do this from command line, using combination of commit
> limiting a..b and a...b, or --since=<date> or --after=<date> and
> --before=<date>, commit message searching --author, --committer, and
> --grep, and path limiting "git log -- <pathspec>".
>

Well, a Web-based search engine is kind of a requirement. I'm the only one to do command line... Thanks for the hints, though!

> Third, it would be not that hard to add more advanced search support
> to gitweb; this is even one of planned features.
>

Which brings back to the subject of submodules, since as I said above, we generally search on the entire tree, and per-module searches are rare.

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> > * third: also Bonsai-related; Bonsai can link to Bugzilla by
> > matching (wild guess) /\b(?:#?)(\d+)\b/ and transforming this into
> > http://your.bugzilla.fqdn.here/show_bug.cgi?id=$1. Does gitweb have
> > this built-in? (haven't looked yet) Is this planned, or has it been
> > discussed and been considered not worth the hassle?
>
> This is (under name of 'committags') in gitweb TODO; gitweb-xmms2
> support this IIRC or supported this (for Mantis and not Bugzilla
> though...)

Interesting... I'll have a look at it.

Thanks for the answers!

-- 
fge