Re: General support for ! in git-config values

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On 2 February 2012 10:54, Jeff King <peff@xxxxxxxx> wrote:
> On Thu, Feb 02, 2012 at 10:44:05AM +0100, demerphq wrote:
>
>> The general design of git seems to me to be based around providing
>> building blocks that people can use to build new and interesting tools
>> on top of, and so it seems counter to that philosophy to reject an
>> feature based on speculative security issues that really can't be
>> decided in advance but must instead be decided on a case by case
>> basis.
>
> I can't speak for Junio, but I am certainly not rejecting it. Only
> saying that it needs to be thought through, and the utility weighed
> against the costs.

Of course. I totally understand. I have written mails saying stuff
like this myself. :-)

> So far I haven't seen an actual patch to comment on
> (or even a proposed syntax beyond starting a string with "!", which I
> think is a non-starter due to conflicting with existing uses),

I understand. I think we will probably use backtick quoting in git-deploy. So

deploy.prefix=`cat /etc/SERVER_ROLE`

will execute cat /etc/SERVER_ROLE and use the results as the value of
the config option.

> nor have
> I seen a concrete use case (you mentioned pulling the name/email from
> ldap, but you also mentioned that there are lots of other ways of
> solving that particular problem, so it's not especially compelling).

One place that it would be useful for us in git-deploy would be to
detect the tag prefix for the rollout we are doing. Every staging
server already has a file that contains this value. We would like to
make it easy for people to configure the tool to either use the value
provided, or to use something like  `cat /etc/SERVER_ROLE` instead.
Anyway, from that POV I could totally understand "so do that in
git-deploy". Since the tool is written in perl we have to wrap
git-config anyway, so it easy to add a special case for ourselves.

But I still think the general idea is pretty useful, the ldap example
is IMO a cleaner solution than the alternatives, and a variant that I
think is much harder to do currently come to mind right away: setting
the user.email automatically depending on where in your tree a git
repo was located, so that when I work on repo underneath  /CPAN/ it
uses my CPAN address, and when I work in my /work/ tree it uses my
$work address, etc, without me having to configure it repo by repo.
(This has bitten more than once in the past)

> I'd be happy to hear a more concrete proposal.

I will be mostly afk the next week so I will leave that to Avar if he
wants to pursue it.

cheers,
Yves


-- 
perl -Mre=debug -e "/just|another|perl|hacker/"
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