Re: [PATCH] git rev-parse: Fix --show-cdup inside symlinked directory

[Yves Orton <yves.orton@booking.com>]

On Tue, 2008-07-15 at 17:40 +0200, Petr Baudis wrote:
>   no, no, this is for the scenario other way around: you have a normal
> subdirectory in the working tree, and point a symlink _at_ it from
> $somewhere_else. Then you try to work in $somewhere_else/symlink.

Yes correct. We have a number of different repositories like so:

banana.git/apps
banana.git/lib
orange.git/config
kiwi.git/refdata

and its convenient for many of our existing apps to be able to symlink
them all together into a common tree

joined/apps -> banana.git/apps
joined/lib -> banana.git/lib
joined/config -> orange.git/config
joined/refdata -> kiwi.git/refdata

this way for instance we can swap bits around easily on the fly and say,
restart a webserver or whatever.

Currently we can do this and all our other stuff works, and you
can /mostly/ work with git from the "joined" tree, with the exception of
git pull --rebase and apparently anything else that relies on
--show-cdup

> > > This patch changes --show-cdup to always show absolute workdir path
> > > instead. I think this should hopefully cause no compatibility problems;
> > > the testsuite is passing fine, at least.
> > 
> > See the thread where I proposed a change like this, back with the infamous 
> > worktree desaster, and Junio NACKed; or the thread where Linus rightfully 
> > insists that git_dir should be relative if possible, for performance 
> > reasons.
> 
>   I see, <7vk5sly3h9.fsf@assigned-by-dhcp.cox.net>. But noone was aware
> of this possible user case. Performance reasons sound reasonable, though
> I'm not really sure if for cdup in particular this ever matters.

Would it be so bad to detect if the show-cdup actually resolves to the
right place, and if it doesnt go absolute?

> 
>   P.S.: Either way, there is a possible workaround to tell git about the
> working directory manually using git --work-tree=... that I missed to
> mention on IRC, Yves.

Hmm, am i using it wrong then?

[dmq@somewhere apps]$ git-rev-parse --git-dir
/home/dmq/git_tree/main/.git
[dmq@somewhere apps]$ git --work-tree="$(git-rev-parse --git-dir)" pull
--rebase
/usr/bin/git-sh-setup: line 139: cd: .git: No such file or directory
Unable to determine absolute path of git directory

cheers,
yves
ps: not on list, please cc me on replies (sorry for the hassle)