bug#17946: Try LOGNAME in addition to USER

[Taylan Ulrich Bayirli/Kammer]

Cron jobs may set the LOGNAME environment variable but no USER,
e.g. under Debian 7 (wheezy).  In that case 'guix package' fails to
use $localstatedir/guix/profiles/per-user/$user.  From a quick grep I
couldn't find more places in Guix where USER is used, so here's a
patch that just does it straightforwardly in two places in
scripts/package.scm, but perhaps a more generic solution would be good
for the future.


===File
/home/tub/media/src/guix/0001-Try-LOGNAME-in-addition-to-USER.patch===
>From 902267cf99aacaea994cc95b77551f0d2bd35836 Mon Sep 17 00:00:00 2001
From: Taylan Ulrich B <address@hidden>
Date: Sat, 5 Jul 2014 15:28:50 +0300
Subject: [PATCH] Try LOGNAME in addition to USER.

Notoriously, cron jobs may set LOGNAME only and not USER.  See
e.g. crontab(5) under Debian 7 (wheezy).

* guix/scripts/package.scm (%profile-directory)
(guix-package): Also try LOGNAME if USER is unset.
---
 guix/scripts/package.scm | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/guix/scripts/package.scm b/guix/scripts/package.scm
index f930b00..2e626f3 100644
--- a/guix/scripts/package.scm
+++ b/guix/scripts/package.scm
@@ -59,7 +59,8 @@
 
 (define %profile-directory
   (string-append %state-directory "/profiles/"
-                 (or (and=> (getenv "USER")
+                 (or (and=> (or (getenv "USER")
+                                (getenv "LOGNAME"))
                             (cut string-append "per-user/" <>))
                      "default")))
 
@@ -797,7 +798,9 @@ more information.~%"))
                 %profile-directory)
         (format (current-error-port)
                 (_ "Please change the owner of `~a' to user ~s.~%")
-                %profile-directory (or (getenv "USER") (getuid)))
+                %profile-directory (or (getenv "USER")
+                                       (getenv "LOGNAME")
+                                       (getuid)))
         (rtfm))))
 
   (define (process-actions opts)
-- 
1.8.4

============================================================

Taylan