From f990fee25e4d62ffff4d6ee89be05b2563865324 Mon Sep 17 00:00:00 2001
From: Leo Prikler <leo.prikler@student.tugraz.at>
Date: Tue, 17 Dec 2019 12:53:21 +0100
Subject: [PATCH 1/2] guix: Wait for file lock.

* guix/ui.scm: Adjust imports.
(with-profile-lock): Use `with-file-lock' instead of `with-file-lock/no-wait'.
* guix/scripts/package.scm: Drop unused import.
(process-actions): Print message while waiting on lock.
---
 guix/scripts/package.scm | 3 +--
 guix/ui.scm              | 4 ++--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/guix/scripts/package.scm b/guix/scripts/package.scm
index 92c6e34194..202a6d6470 100644
--- a/guix/scripts/package.scm
+++ b/guix/scripts/package.scm
@@ -42,8 +42,6 @@
   #:autoload   (guix store roots) (gc-roots)
   #:use-module ((guix build utils)
                 #:select (directory-exists? mkdir-p))
-  #:use-module ((guix build syscalls)
-                #:select (with-file-lock/no-wait))
   #:use-module (ice-9 format)
   #:use-module (ice-9 match)
   #:use-module (ice-9 regex)
@@ -866,6 +864,7 @@ processed, #f otherwise."
 
   ;; First, acquire a lock on the profile, to ensure only one guix process
   ;; is modifying it at a time.
+  (format #t "Waiting for lock on ~a...~%" profile)
   (with-profile-lock profile
     ;; Then, process roll-backs, generation removals, etc.
     (for-each (match-lambda
diff --git a/guix/ui.scm b/guix/ui.scm
index 540671f3dd..060c4e73f1 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -48,7 +48,7 @@
                 #:select (license? license-name license-uri))
   #:use-module ((guix build syscalls)
                 #:select (free-disk-space terminal-columns terminal-rows
-                          with-file-lock/no-wait))
+                          with-file-lock))
   #:use-module ((guix build utils)
                 ;; XXX: All we need are the bindings related to
                 ;; '&invoke-error'.  However, to work around the bug described
@@ -1680,7 +1680,7 @@ DURATION-RELATION with the current time."
 (define-syntax-rule (with-profile-lock profile exp ...)
   "Grab PROFILE's lock and evaluate EXP...  Call 'leave' if the lock is
 already taken."
-  (with-file-lock/no-wait (profile-lock-file profile)
+  (with-file-lock (profile-lock-file profile)
     (cut profile-lock-handler profile <...>)
     exp ...))
 
-- 
2.24.1