gnu: version-control: Add make-gitolite procedure.

* gnu/packages/version-control.scm (make-gitolite): New procedure.
(gitolite): Use make-gitolite.
* doc/guix.texi (Gitolite service): Document how to use make-gitolite.

doc/guix.texi

@@ -35618,7 +35618,21 @@ Data type representing the configuration for @code{gitolite-service-type}.
 
 @table @asis
 @item @code{package} (default: @var{gitolite})
-Gitolite package to use.
+Gitolite package to use.  There are optional Gitolite dependencies that
+are not included in the default package, such as Redis and git-annex.
+These features can be made available by using the @code{make-gitolite}
+procedure in the @code{(gnu packages version-control}) module to produce
+a variant of Gitolite with the desired additional dependencies.
+
+The following code returns a package in which the Redis and git-annex
+programs can be invoked by Gitolite's scripts:
+
+@example
+(use-modules (gnu packages databases)
+             (gnu packages haskell-apps)
+             (gnu packages version-control))
+(make-gitolite (list redis git-annex))
+@end example
 
 @item @code{user} (default: @var{git})
 User to use for Gitolite.  This will be user that you use when accessing

gnu/packages/version-control.scm

@@ -46,6 +46,7 @@
 ;;; Copyright © 2022 Jai Vetrivelan <jaivetrivelan@gmail.com>
 ;;; Copyright © 2022 Maxime Devos <maximedevos@telenet.be>
 ;;; Copyright © 2022 Dhruvin Gandhi <contact@dhruvin.dev>
+;;; Copyright © 2015, 2022 David Thompson <davet@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -139,7 +140,8 @@ (define-module (gnu packages version-control)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages)
   #:use-module (ice-9 match)
-  #:use-module (srfi srfi-1))
+  #:use-module (srfi srfi-1)
+  #:export (make-gitolite))
 
 (define-public breezy
   (package
@@ -1484,7 +1486,9 @@ (define-public git-test-sequence
 also walk each side of a merge and test those changes individually.")
       (license (license:x11-style "file://LICENSE")))))
 
-(define-public gitolite
+(define* (make-gitolite #:optional (extra-inputs '()))
+  "Make a gitolite package object with EXTRA-INPUTS added to the binary
+wrappers, to be used for optional gitolite extensions."
   (package
     (name "gitolite")
     (version "3.6.12")
@@ -1576,10 +1580,12 @@ (define-public gitolite
                                          (list #$output
                                                #$coreutils
                                                #$findutils
-                                               #$git)))))
+                                               #$git
+                                               #$@extra-inputs)))))
                              '("/bin/gitolite" "/bin/gitolite-shell")))))))
     (inputs
-     (list bash-minimal coreutils findutils git inetutils openssh perl))
+     (append (list bash-minimal coreutils findutils git inetutils openssh perl)
+             extra-inputs))
     (home-page "https://gitolite.com")
     (synopsis "Git access control layer")
     (description
@@ -1587,6 +1593,8 @@ (define-public gitolite
 control to Git repositories.")
     (license license:gpl2)))
 
+(define-public gitolite (make-gitolite))
+
 (define-public gitile
   (package
     (name "gitile")