Re: Advices to imlement update hook

[Jeff King <peff@peff.net>]

On Wed, Feb 09, 2011 at 05:51:24PM +0100, Francis Moreau wrote:

> >>>    git diff-tree <oldref> <newref> -- ^b || exit 1
> >>>
> >>> but it doesn't work.
> >>
> >>   git diff-tree --quiet <oldref> <newref> -- b
> >
> > should do it; it sets the exit code.
> 
> but does that work if a commit modify b/ and another directory ?

No, it just looks for commits that modified b. There is currently no way
to specify a path to say "commit that did not modify b". You need to
check the output of:

  git rev-list | git diff-tree --stdin -m --name-only

which should list all paths modified by all commits. And then you can
either blacklist or whitelist as appropriate (note that the names can be
quoted; you might want to look at the "-z" option and do your
list-checking in perl).

> > But don't you also want to inspect all commits between oldref and newref?
> 
> Yes I want to inspect all commits in the range.

see above.

> > Someone could have modified the directory, and then reverted the
> > modification in a later commit. If these commits arrive in a single push,
> > the above code wouldn't notice this.
> 
> I agree but I thought that git diff-tree would list all changes made
> between the 2 refs.

Between the two endpoints. It won't even look at the commits in the
middle, so as long as a later middle commit reverts the change of an
earlier middle commit, the endpoints won't be affected.

-Peff