[PATCH v2 00/19] nd/setup part two, second round

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Again, this series is to make repository setup more predictable, i.e. must be done
in either setup_git_dir*, enter_repo or init_db. Compared to the first version [1]:

 - More detail in commit messages, mostly extracted from [2]
 - Fix "git foo -h" code path (that skips repo setup) in patches 14-16

[1] http://mid.gmane.org/1268313754-28179-1-git-send-email-pclouds@gmail.com
[2] http://mid.gmane.org/fcaeb9bf1003200110w721903e7v7a5823cb312cbc71@mail.gmail.com

Nguyễn Thái Ngọc Duy (19):
  Move enter_repo() to setup.c
  enter_repo(): initialize other variables as setup_git_directory_gently() does
  rev-parse --git-dir: print relative gitdir correctly
  worktree setup: call set_git_dir explicitly
  Add git_config_early()
  Use git_config_early() instead of git_config() during repo setup
  worktree setup: restore original state when things go wrong
  init/clone: turn on startup->have_repository properly
  git_config(): do not read .git/config if there is no repository
  Do not read .git/info/exclude if there is no repository
  Do not read .git/info/attributes if there is no repository
  apply: do not check sha1 when repository has not been found
  config: do not read .git/config if there is no repository
  run_builtin(): save "-h" detection result for later use
  builtins: utilize startup_info->help where possible
  builtins: check for startup_info->help, print and exit early
  Allow to undo setup_git_directory_gently() gracefully (and fix alias code)
  alias: keep repository found while collecting aliases as long as possible
  Guard unallowed access to repository when it's not set up

 attr.c                     |    5 +-
 builtin/apply.c            |    2 +-
 builtin/branch.c           |    3 +
 builtin/check-ref-format.c |    2 +-
 builtin/checkout-index.c   |    3 +
 builtin/clone.c            |    3 +-
 builtin/commit.c           |    6 ++
 builtin/config.c           |    9 ++-
 builtin/gc.c               |    3 +
 builtin/grep.c             |    2 +-
 builtin/index-pack.c       |    2 +-
 builtin/init-db.c          |   10 ++-
 builtin/log.c              |    7 +-
 builtin/ls-files.c         |    3 +
 builtin/merge-ours.c       |    2 +-
 builtin/merge.c            |    3 +
 builtin/pack-redundant.c   |    2 +-
 builtin/rev-parse.c        |    8 ++
 builtin/show-ref.c         |    2 +-
 builtin/update-index.c     |    3 +
 builtin/upload-archive.c   |    7 +-
 cache.h                    |    7 ++-
 config.c                   |   22 ++++-
 dir.c                      |    8 +-
 environment.c              |   33 +++++++-
 git.c                      |   33 +++++---
 path.c                     |   91 ---------------------
 setup.c                    |  191 +++++++++++++++++++++++++++++++++++++++++---
 t/t1300-repo-config.sh     |   14 +++
 t/t1302-repo-version.sh    |    2 +-
 t/t7002-grep.sh            |   24 ++++++
 31 files changed, 360 insertions(+), 152 deletions(-)