Re: git-shortlog hangs on bare repo without --bare option

[Junio C Hamano <gitster@pobox.com>]

Junio C Hamano <gitster@pobox.com> writes:

> And I think this is related to the complexity that snuck in when worktree
> feature was added to the setup sequence.
>
> Untested, but I think this would help.

While it might help, I see there are more serious issue here.

If you start "git-shortlog" (or anything that has USE_PAGER but not
RUN_SETUP in git.c) inside your project/.git directory (or a bare one, for
that matter), the call sequence would become like this:

git.c::main()
 -> handle_internal_command()
   -> run_command()
     -> commit_pager_choice()
       -> setup_pager() (this is in pager.c)
         -> git_config(git_default_config, NULL)
           -> git_path("config")
             -> get_git_dir()
               -> setup_git_env()
                 This sets git_dir to ".git"!!!!

And that was part of the reason why "git-shortlog" started from a bare
repository did not even notice that the default "HEAD" that is given
internally by the program is not a valid ref (because it tries to read
from .git/HEAD without the patch I sent earlier).

This may be repeating what Jeff said earlier in another thread, but I
think we should rethink the start-up sequence carefully.  Ideally (I am
thinking aloud)...

 * Have a single function "git_setup()" that notices --bare and --git-dir
   from the command line and GIT_DIR environment, and does the discovery
   of git_dir (if not told with the command line or environment
   explicitly); if we do not find it, do *NOT* barf.  Just record the
   facts it finds somewhere (e.g. the location of git_dir, absense of
   git_dir, if the repository is explicitly bare, etc.).

 * As the next step, still in this single function, if we have git_dir,
   find out where the work_tree is, paying attention to --work-tree from
   the command line and GIT_WORK_TREE environment if exists.  If we do not
   have work tree, do *NOT* barf.  Again, just record the facts it finds.
   If we do not have --work-tree from the command line and if we are not
   told that it is --bare from the command line, then we may need to open
   the config to see where core.worktree points at.

 * Before returning from that single setup function, i think it is Ok to
   make it mimick the current git_setup_directory_gently(), cd up to the
   normal work-tree top if needed, and make it return prefix.

 * After all of the above is done, then we can start futzing with other
   things such as pager.  At that point we know we can read from the
   correct configuratoin.

 * Each individual command may decide to refuse to work in the absense of
   git_dir and/or work_tree, by calling require_work_tree(), etc.

Hmm?