Merge branch 'lo/repo-info-step-2'

"repo info" learns a short-hand option "-z" that is the same as
"--format=nul", and learns to report the objects format used in the
repository.

* lo/repo-info-step-2:
  repo: add the field objects.format
  repo: add the flag -z as an alias for --format=nul

Documentation/git-repo.adoc

@@ -8,7 +8,7 @@ git-repo - Retrieve information about the repository
 SYNOPSIS
 --------
 [synopsis]
-git repo info [--format=(keyvalue|nul)] [<key>...]
+git repo info [--format=(keyvalue|nul)] [-z] [<key>...]
 
 DESCRIPTION
 -----------
@@ -18,7 +18,7 @@ THIS COMMAND IS EXPERIMENTAL. THE BEHAVIOR MAY CHANGE.
 
 COMMANDS
 --------
-`info [--format=(keyvalue|nul)] [<key>...]`::
+`info [--format=(keyvalue|nul)] [-z] [<key>...]`::
 	Retrieve metadata-related information about the current repository. Only
 	the requested data will be returned based on their keys (see "INFO KEYS"
 	section below).
@@ -40,6 +40,8 @@ supported:
 	between the key and the value and using a NUL character after each value.
 	This format is better suited for being parsed by another applications than
 	`keyvalue`. Unlike in the `keyvalue` format, the values are never quoted.
++
+`-z` is an alias for `--format=nul`.
 
 INFO KEYS
 ---------
@@ -53,6 +55,9 @@ values that they return:
 `layout.shallow`::
 	`true` if this is a shallow repository, otherwise `false`.
 
+`object.format`::
+	The object format (hash algorithm) used in the repository.
+
 `references.format`::
 	The reference storage format. The valid values are:
 +