In a linked worktree, <repo>/.git is a regular file ("gitdir: <path>")
rather than a directory. cbm_discover_ex gated all per-clone ignore
sources on .git being a directory, so inside a worktree it skipped
.git/info/exclude and the global core.excludesfile entirely and walked
into directories the user had excluded there (e.g. build/, twister-out/).
Committed .gitignore still applied via the issue #510 path, which is why
the gap was easy to miss.
Resolve the git common dir up front: when .git is a gitlink file, parse
'gitdir:', then follow <gitdir>/commondir to the shared dir where git
keeps info/exclude and config (falling back to the gitdir when no
commondir file is present). info/exclude and config are then read from
that common dir, so a worktree behaves like an ordinary checkout.
Adds discover_worktree_info_exclude (fails before this change) and
discover_worktree_committed_gitignore.
Signed-off-by: Nahim El Atmani <2959826+Naam@users.noreply.github.com>
Nahim El Atmani
f1b93829dc