bug#36242: Repacked source checkouts get a misleading file name

[Marius Bakke <mbakke@fastmail.com>]

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Hello,

When repacking a source checkout (e.g. by using git-fetch with a
snippet), the generated file name contains only the first two version
identifiers.

E.g. `guix build -S eudev` returns

/gnu/store/7lgsxmr0rk9f8fbq6k0kj1aqb7lnrlll-eudev-3.2.tar.xz

...even though it should be "3.2.8".

This patch fixes it:


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From 0c44561d0d45de91f4674d659b86d740642ae801 Mon Sep 17 00:00:00 2001
From: Marius Bakke <mbakke@fastmail.com>
Date: Sun, 16 Jun 2019 10:50:15 +0200
Subject: [PATCH] packages: Keep full version in file name when repacking
 source checkouts.

* guix/packages.scm (patch-and-repack): If ORIGINAL-FILE-NAME is a source
checkout, drop the '-checkout' part so the version-detecting code works.
---
 guix/packages.scm | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/guix/packages.scm b/guix/packages.scm
index c94a651f27..5b8969e079 100644
--- a/guix/packages.scm
+++ b/guix/packages.scm
@@ -505,11 +505,17 @@ specifies modules in scope when evaluating SNIPPET."
     (and=> (file-extension file-name)
            (cut string-every char-set:hex-digit <>)))
 
+  (define (checkout? directory)
+    ;; Return true if DIRECTORY is a checkout (git, svn, etc).
+    (string-suffix? "-checkout" directory))
+
   (define (tarxz-name file-name)
     ;; Return a '.tar.xz' file name based on FILE-NAME.
-    (let ((base (if (numeric-extension? file-name)
-                    original-file-name
-                    (file-sans-extension file-name))))
+    (let ((base (cond ((numeric-extension? file-name)
+                       original-file-name)
+                      ((checkout? file-name)
+                       (string-drop-right file-name 9))
+                      (else (file-sans-extension file-name)))))
       (string-append base
                      (if (equal? (file-extension base) "tar")
                          ".xz"
-- 
2.22.0


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