From 17a102332a253f0e3b1f511fa7bda2094264a77c Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Fri, 29 May 2020 16:44:27 +0200
Subject: syscalls: 'terminal-dimension' ignores EPERM.

Fixes <https://bugs.gnu.org/41581>.
Reported by Tobias Geerinckx-Rice <me@tobias.gr>.

* guix/build/syscalls.scm (terminal-dimension): Add EPERM to the list of
errno code for FALL-BACK.
---
 guix/build/syscalls.scm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm
index 6be322d68f..d69b178a0a 100644
--- a/guix/build/syscalls.scm
+++ b/guix/build/syscalls.scm
@@ -2052,8 +2052,8 @@ correspond to a terminal, return the value returned by FALL-BACK."
         ;; would return EINVAL instead in some cases:
         ;; <https://bugs.ruby-lang.org/issues/10494>.
         ;; Furthermore, some FUSE file systems like unionfs return ENOSYS for
-        ;; that ioctl.
-        (if (memv errno (list ENOTTY EINVAL ENOSYS))
+        ;; that ioctl, and bcachefs returns EPERM.
+        (if (memv errno (list ENOTTY EINVAL ENOSYS EPERM))
             (fall-back)
             (apply throw args))))))
 
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