bug#70922: [PATCH] Look at DEBBUGS_DATA for Debbugs data.

[Felix Lechner via Bug-mumi via "Bug reports for GNU Guix Mumi." <bug-mumi@gnu.org>]

Maintaining symbolic links to Debbugs data is not reasonable burden
for co-existing installations of various versions of Debbugs and Mumi.

This change further allows the location to be configured in an
operating-system declaration that syncronizes the data from
debbugs.gnu.org via a Shepherd timer.  A patch with a 'configuration'
record is available but has not been submitted.
---
 mumi/config.scm.in | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/mumi/config.scm.in b/mumi/config.scm.in
index eda815b..cf916fb 100644
--- a/mumi/config.scm.in
+++ b/mumi/config.scm.in
@@ -62,16 +62,17 @@
                                         (string-replace dir "@prefix@"
                                                         0 (string-length "${prefix}"))
                                         dir))))) 
-           (data-dir . ,(let ((maybe-dir
-                               (string-append (getcwd) "/data")))
-                          (if (and (getenv "MUMI_UNINSTALLED")
-                                   (file-exists? maybe-dir))
-                              maybe-dir
-                              (let ((dir "@localstatedir@/mumi/data"))
-                                (if (string-prefix? "${prefix}" dir)
-                                    (string-replace dir "@prefix@"
-                                                    0 (string-length "${prefix}"))
-                                    dir)))))
+           (data-dir . ,(or (getenv "DEBBUGS_DATA")
+                            (let ((maybe-dir
+                                   (string-append (getcwd) "/data")))
+                              (if (and (getenv "MUMI_UNINSTALLED")
+                                       (file-exists? maybe-dir))
+                                  maybe-dir
+                                  (let ((dir "@localstatedir@/mumi/data"))
+                                    (if (string-prefix? "${prefix}" dir)
+                                        (string-replace dir "@prefix@"
+                                                        0 (string-length "${prefix}"))
+                                        dir))))))
            (host        . "localhost")
            (port        . 1234)
            (cache-ttl   . 120)

base-commit: 99416ed5c7d950eaf54d52023a2efd975bccac92
-- 
2.41.0