[PATCH v2 0/5] Allow relative worktree linking to be configured by the user

This patch introduces the `--[no-]relative-paths` CLI option for `git worktree {add, move, repair}` commands, as well as the `worktree.useRelativePaths` configuration setting. When enabled, these options allow worktrees to be linked using relative paths, enhancing portability across environments where absolute paths may differ (e.g., containerized setups, shared network drives). Git still creates absolute paths by default, but these options allow users to opt-in to relative paths if desired.

Using the `--relative-paths` option with `worktree {move, repair}` will convert absolute paths to relative ones, while `--no-relative-paths` does the reverse. For cases where users want consistency in path handling, the config option `worktree.useRelativePaths` provides a persistent setting.

A new extension, `relativeWorktrees`, is added to indicate that at least one worktree in the repository has been linked with relative paths. This extension is automatically set when a worktree is created or repaired using the `--relative-paths` option, or when the `worktree.useRelativePaths` config is set to `true`.

The `relativeWorktrees` extension ensures older Git versions do not attempt to automatically prune worktrees with relative paths, as they would not not recognize the paths as being valid.

Signed-off-by: Caleb White <cdwhite3@pm.me>
---
The base for this patch series is obtained by applying the following
patch onto 6a11438f43:
- cw/config-extensions topic (doc: consolidate extensions in git-config
  documentation, 2024-10-22, <20241021-cleanup-extension-docs-v1-1-ab02cece3132@pm.me>)

Link to original patch series: https://lore.kernel.org/git/20241007-wt_relative_paths-v3-0-622cf18c45eb@pm.me

---
Changes in v2:
- Fixed a bug where repositories with valid extensions would be downgraded
  to v0 during reinitialization, causing future operations to fail.
- Split patch [1/2] into three separate patches.
- Updated cover letter and commit messages.
- Updated documentation wording.
- Link to v1: https://lore.kernel.org/r/20241025-wt_relative_options-v1-0-c3005df76bf9@pm.me

---
Caleb White (5):
      worktree: add CLI/config options for relative path linking
      worktree: add `write_worktree_linking_files` function
      worktree: add tests for worktrees with relative paths
      setup: correctly reinitialize repository version
      worktree: add `relativeWorktrees` extension

 Documentation/config/extensions.txt |   6 ++
 Documentation/config/worktree.txt   |   5 ++
 Documentation/git-worktree.txt      |  12 +++
 builtin/worktree.c                  |  20 ++---
 repository.c                        |   1 +
 repository.h                        |   1 +
 setup.c                             |  39 +++++++---
 setup.h                             |   1 +
 t/t0001-init.sh                     |  17 ++++-
 t/t2400-worktree-add.sh             |  54 ++++++++++++++
 t/t2401-worktree-prune.sh           |   3 +-
 t/t2402-worktree-list.sh            |  22 ++++++
 t/t2403-worktree-move.sh            |  22 ++++++
 t/t2406-worktree-repair.sh          |  26 +++++++
 t/t2408-worktree-relative.sh        |  39 ----------
 worktree.c                          | 143 ++++++++++++++++++++----------------
 worktree.h                          |  14 ++++
 17 files changed, 298 insertions(+), 127 deletions(-)
---
base-commit: 6a11438f43469f3815f2f0fc997bd45792ff04c0
change-id: 20241025-wt_relative_options-afa41987bc32
prerequisite-change-id: 20241020-cleanup-extension-docs-f365868711bf:v1
prerequisite-patch-id: 60a443b24e92938b9b6f4a016a7bab87e13bf3ea

Best regards,