extensions.*::
	Unless otherwise stated, is an error to specify an extension if
	`core.repositoryFormatVersion` is not `1`. See
	linkgit:gitrepository-layout[5].
+
--
compatObjectFormat::
	Specify a compatibility hash algorithm to use.  The acceptable values
	are `sha1` and `sha256`.  The value specified must be different from the
	value of `extensions.objectFormat`.  This allows client level
	interoperability between git repositories whose objectFormat matches
	this compatObjectFormat.  In particular when fully implemented the
	pushes and pulls from a repository in whose objectFormat matches
	compatObjectFormat.  As well as being able to use oids encoded in
	compatObjectFormat in addition to oids encoded with objectFormat to
	locally specify objects.

noop::
	This extension does not change git's behavior at all. It is useful only
	for testing format-1 compatibility.
+
For historical reasons, this extension is respected regardless of the
`core.repositoryFormatVersion` setting.

noop-v1::
	This extension does not change git's behavior at all. It is useful only
	for testing format-1 compatibility.

objectFormat::
	Specify the hash algorithm to use.  The acceptable values are `sha1` and
	`sha256`.  If not specified, `sha1` is assumed.
+
Note that this setting should only be set by linkgit:git-init[1] or
linkgit:git-clone[1].  Trying to change it after initialization will not
work and will produce hard-to-diagnose issues.

partialClone::
	When enabled, indicates that the repo was created with a partial clone
	(or later performed a partial fetch) and that the remote may have
	omitted sending certain unwanted objects.  Such a remote is called a
	"promisor remote" and it promises that all such omitted objects can
	be fetched from it in the future.
+
The value of this key is the name of the promisor remote.
+
For historical reasons, this extension is respected regardless of the
`core.repositoryFormatVersion` setting.

preciousObjects::
	If enabled, indicates that objects in the repository MUST NOT be deleted
	(e.g., by `git-prune` or `git repack -d`).
+
For historical reasons, this extension is respected regardless of the
`core.repositoryFormatVersion` setting.

refStorage::
	Specify the ref storage format to use. The acceptable values are:
+
include::../ref-storage-format.adoc[]

+
Note that this setting should only be set by linkgit:git-init[1] or
linkgit:git-clone[1]. Trying to change it after initialization will not
work and will produce hard-to-diagnose issues.

relativeWorktrees::
	If enabled, indicates at least one worktree has been linked with
	relative paths. Automatically set if a worktree has been created or
	repaired with either the `--relative-paths` option or with the
	`worktree.useRelativePaths` config set to `true`.

worktreeConfig::
	If enabled, then worktrees will load config settings from the
	`$GIT_DIR/config.worktree` file in addition to the
	`$GIT_COMMON_DIR/config` file. Note that `$GIT_COMMON_DIR` and
	`$GIT_DIR` are the same for the main working tree, while other
	working trees have `$GIT_DIR` equal to
	`$GIT_COMMON_DIR/worktrees/<id>/`. The settings in the
	`config.worktree` file will override settings from any other
	config files.
+
When enabling this extension, you must be careful to move
certain values from the common config file to the main working tree's
`config.worktree` file, if present:
+
* `core.worktree` must be moved from `$GIT_COMMON_DIR/config` to
  `$GIT_COMMON_DIR/config.worktree`.
* If `core.bare` is true, then it must be moved from `$GIT_COMMON_DIR/config`
  to `$GIT_COMMON_DIR/config.worktree`.

+
It may also be beneficial to adjust the locations of `core.sparseCheckout`
and `core.sparseCheckoutCone` depending on your desire for customizable
sparse-checkout settings for each worktree. By default, the `git
sparse-checkout` builtin enables this extension, assigns
these config values on a per-worktree basis, and uses the
`$GIT_DIR/info/sparse-checkout` file to specify the sparsity for each
worktree independently. See linkgit:git-sparse-checkout[1] for more
details.
+
For historical reasons, this extension is respected regardless of the
`core.repositoryFormatVersion` setting.
--