Re: [PATCH v6 00/32] Support multiple checkouts

> This is basically a reroll from what was parked on 'pu' with two
> new patches at the end: one to not share info/sparse-checkout
> across worktrees, and one to allow 'checkout --to` from a bare
> repository.
> 
> I cherry-picked two patches from jk/xstrfmt (on next) because they
> result in non-trivial conflicts. When this series is merged with
> jk/xstrfmt, you still get conflicts in environment.c, but you can just
> pick up my changes and drop Jeff's.
> 
> Dennis Kaarsemaker (1):
>   checkout: don't require a work tree when checking out into a new one
> 
> Jeff King (2):
>   setup_git_env: use git_pathdup instead of xmalloc + sprintf
>   setup_git_env(): introduce git_path_from_env() helper
> 
> Nguyễn Thái Ngọc Duy (29):
>   path.c: make get_pathname() return strbuf instead of static buffer
>   path.c: make get_pathname() call sites return const char *
>   git_snpath(): retire and replace with strbuf_git_path()
>   path.c: rename vsnpath() to do_git_path()
>   path.c: group git_path(), git_pathdup() and strbuf_git_path() together
>   git_path(): be aware of file relocation in $GIT_DIR
>   *.sh: respect $GIT_INDEX_FILE
>   reflog: avoid constructing .lock path with git_path
>   fast-import: use git_path() for accessing .git dir instead of get_git_dir()
>   commit: use SEQ_DIR instead of hardcoding "sequencer"
>   $GIT_COMMON_DIR: a new environment variable
>   git-sh-setup.sh: use rev-parse --git-path to get $GIT_DIR/objects
>   *.sh: avoid hardcoding $GIT_DIR/hooks/...
>   git-stash: avoid hardcoding $GIT_DIR/logs/....
>   setup.c: convert is_git_directory() to use strbuf
>   setup.c: detect $GIT_COMMON_DIR in is_git_directory()
>   setup.c: convert check_repository_format_gently to use strbuf
>   setup.c: detect $GIT_COMMON_DIR check_repository_format_gently()
>   setup.c: support multi-checkout repo setup
>   wrapper.c: wrapper to open a file, fprintf then close
>   use new wrapper write_file() for simple file writing
>   checkout: support checking out into a new working directory
>   checkout: clean up half-prepared directories in --to mode
>   checkout: detach if the branch is already checked out elsewhere
>   prune: strategies for linked checkouts
>   gc: style change -- no SP before closing bracket
>   gc: support prune --repos
>   count-objects: report unused files in $GIT_DIR/repos/...
>   git_path(): keep "info/sparse-checkout" per work-tree
> 
>  Documentation/config.txt               |   9 ++
>  Documentation/git-checkout.txt         |  34 +++++
>  Documentation/git-prune.txt            |   3 +
>  Documentation/git-rev-parse.txt        |  10 ++
>  Documentation/git.txt                  |   9 ++
>  Documentation/gitrepository-layout.txt |  75 ++++++++--
>  builtin/branch.c                       |   4 +-
>  builtin/checkout.c                     | 248 ++++++++++++++++++++++++++++++++-
>  builtin/clone.c                        |   9 +-
>  builtin/commit.c                       |   2 +-
>  builtin/count-objects.c                |   4 +-
>  builtin/fetch.c                        |   5 +-
>  builtin/fsck.c                         |   4 +-
>  builtin/gc.c                           |  21 ++-
>  builtin/init-db.c                      |   7 +-
>  builtin/prune.c                        |  74 ++++++++++
>  builtin/receive-pack.c                 |   2 +-
>  builtin/reflog.c                       |   2 +-
>  builtin/remote.c                       |   2 +-
>  builtin/repack.c                       |   8 +-
>  builtin/rev-parse.c                    |  11 ++
>  cache.h                                |  17 ++-
>  daemon.c                               |  11 +-
>  environment.c                          |  45 ++++--
>  fast-import.c                          |   7 +-
>  git-am.sh                              |  22 +--
>  git-pull.sh                            |   2 +-
>  git-rebase--interactive.sh             |   6 +-
>  git-rebase--merge.sh                   |   6 +-
>  git-rebase.sh                          |   4 +-
>  git-sh-setup.sh                        |   2 +-
>  git-stash.sh                           |   6 +-
>  git.c                                  |   2 +-
>  notes-merge.c                          |   6 +-
>  path.c                                 | 234 +++++++++++++++++++++----------
>  refs.c                                 |  86 +++++++-----
>  refs.h                                 |   2 +-
>  run-command.c                          |   4 +-
>  run-command.h                          |   2 +-
>  setup.c                                | 124 +++++++++++++----
>  sha1_file.c                            |   2 +-
>  submodule.c                            |   9 +-
>  t/t0060-path-utils.sh                  |  35 +++++
>  t/t1501-worktree.sh                    |  76 ++++++++++
>  t/t1510-repo-setup.sh                  |   1 +
>  t/t2025-checkout-to.sh (new +x)        |  72 ++++++++++
>  templates/hooks--applypatch-msg.sample |   4 +-
>  templates/hooks--pre-applypatch.sample |   4 +-
>  trace.c                                |   1 +
>  transport.c                            |   8 +-
>  wrapper.c                              |  31 +++++
>  51 files changed, 1109 insertions(+), 265 deletions(-)
>  create mode 100755 t/t2025-checkout-to.sh
>