precommit hook that changes commit list?

[Nicholas Tung]

On Sat, Sep 6, 2008 at 5:45 PM, Giorgos Keramidas
<keramida at ceid.upatras.gr>wrote:

> On Sat, 6 Sep 2008 16:33:18 -0700, "Nicholas Tung" <ntung at ntung.com>
> wrote:
> >On Sat, Sep 6, 2008 at 6:25 AM, Giorgos Keramidas wrote:
> >>On Sat, 6 Sep 2008 01:32:56 -0700, Nicholas Tung wrote:
> >>> Hello,
> >>> I have a precommit hook script that will compile a LaTeX file before
> >>> committing. I know some people feel storing generated files is messy,
> >>> but with the web server, it's just too convenient. Is there a way to
> >>> make Mercurial rescan the commit list to see that this generated file
> >>> has changed before it commits?
> >>
> >> Not really.  Even if there was `changing' a commit on the fly is not
> >> possible without modifying the changeset hashes and altering the repo
> >> history.
> >
> > I take it the changeset hashes only has file names, not content?
> > Because if the file is modified and will be committed, then it can be
> > changed by the pre-commit hook.
>
> No the hash includes much more details (including file contents).


But it's still okay for the pre-commit hook to modify it? I did and didn't
run into problems.

>
>
> >> Why don't you build the files right _after_ commits?  If you have a
> >> build script called `mybuild.sh' then something like this would work:
> >>
> >>    [hooks]
> >>    changegroup = /home/keramida/tools/mybuild.sh
> >>    commit = /home/keramida/tools/mybuild.sh
> >>    # To rebuild after every "hg update" too, add:
> >>    # update = /home/keramida/tools/mybuild.sh
> >
> > The point is not for users downloading the repository to get an
> > updated generated file, but for the version on the web interface to be
> > current (i.e.  what's in the repository).
>
> I got that.  You can install hooks in *remote* repositories too.  When
> you push a change over the wire, the hooks will still trigger.


Okay, neat, thanks. If I ever set up something larger, this would definitely
be useful. However, this time, I just wanted one local repo, which I'm using
hg serve -d with.

thanks,
Nicholas
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