[bug#43060] usage text for git-lfs

[Prafulla Giri <pratheblackdiamond@gmail.com>]

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Esteemed maintainers,

This is a follow-up to https://debbugs.gnu.org/cgi/bugreport.cgi?bug=43044

Despite making the man pages available, the usage text (--help) was still
not available. While `git lfs --help` did bring up the man page, `git-lfs
--help` threw 'Sorry, no usage text found for "git-lfs"'.

The attached patch fixes that. And any calls to invalid lfs commands, or
just `git-lfs` (without any sub-commands).

Thank you.

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From 933ae9f1eab0eb74f59f379877d9b442b6ec96f2 Mon Sep 17 00:00:00 2001
From: Prafulla Giri <pratheblackdiamond@gmail.com>
Date: Wed, 26 Aug 2020 20:16:54 +0545
Subject: [PATCH] gnu: git-lfs: Make usage text available.

* gnu/packages/version-control.scm (git-lfs)[arguments]: Add phase
'man-gen to make usage text available for embedding for the 'build
phase.
---
 gnu/packages/version-control.scm | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gnu/packages/version-control.scm b/gnu/packages/version-control.scm
index 3b23e8b873..bc8e5f21ab 100644
--- a/gnu/packages/version-control.scm
+++ b/gnu/packages/version-control.scm
@@ -2591,6 +2591,12 @@ interrupted, published, and collaborated on while in progress.")
        #:install-source? #f
        #:phases
        (modify-phases %standard-phases
+         (add-before 'build 'man-gen
+           ;; Without this, the binary generated in 'build
+           ;; phase won't have any embedded usage-text.
+           (lambda _
+             (with-directory-excursion "src/github.com/git-lfs/git-lfs"
+               (invoke "make" "mangen"))))
          (add-after 'build 'build-man-pages
            (lambda _
              (with-directory-excursion "src/github.com/git-lfs/git-lfs"
-- 
2.28.0