Re: Confusing error message due to Git trusting is_bare_repository()

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On Fri, Mar 25, 2011 at 11:56:20AM +0100, Ãvar ArnfjÃrà Bjarmason wrote:

> I had a co-worker git this well-known error message:
> 
>     error: refusing to update checked out branch: refs/heads/master
>     error: By default, updating the current branch in a non-bare repository
>     error: is denied, because it will make the index and work tree inconsistent
>     error: with what you pushed, and will require 'git reset --hard' to match
>     error: the work tree to HEAD.
> 
> It *was* a bare repo, but the config file had bare=false because
> someone had simply copied a .git tree from a non-bare repo to make it.

That seems like the problem there. I'm not blaming the user; what they
expected to happen is reasonable, and even used to work. But I wonder if
better education is possible.

> The issue is that we just use this:
> 
>     int is_bare_repository(void)
>     {
>         /* if core.bare is not 'false', let's see if there is a work tree */
>         return is_bare_repository_cfg && !get_git_work_tree();
>     }

> For the purposes of the error message it would be helpful if we also
> detected whether something didn't have a working tree, but was set to
> bare=false, and tell the user to updatet he bare=false to bare=true
> for his almost-bare repository.

How do we know whether or not it has a working tree? Can't I do
something like:

  cd /var/working-trees/foo
  git init
  mv .git /var/repositories/foo.git
  export GIT_DIR=/var/repositories/foo.git
  echo content >file && git add file && git commit -m foo

I thought the reason that core.bare was introduced was to handle weird
cases like this.

-Peff
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