[bug#41606] [PATCH] tests: Allow passing on systems without support for swap devices.

[Simon South <simon@simonsouth.net>]

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The attached patch allows Guix's test suite to pass (and thus, the
"guix" package to be built) on systems that lack support for swap
devices; that is, systems that not only do not have a swap device
enabled but do not have even support for memory paging built into the
kernel (e.g. Linux built without CONFIG_SWAP). This might be the case
for a small home server, for example, on which the workload is
predictable but memory is otherwise at a premium.

On these systems the "swapon" and "swapoff" syscalls return ENOSYS
("Function not implemented"). The patch modifies the relevant tests in
tests/syscalls.scm to accept this as a valid return value.

--
Simon South
simon@simonsouth.net


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From 39507094be62417f76ebd18a0724966ededc7166 Mon Sep 17 00:00:00 2001
From: Simon South <simon@simonsouth.net>
Date: Fri, 29 May 2020 13:53:46 -0400
Subject: [PATCH] tests: Allow passing on systems without support for swap
 devices.

* tests/syscalls.scm ("swapon", "swapoff"): Accept ENOSYS as a valid result.
---
 tests/syscalls.scm | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tests/syscalls.scm b/tests/syscalls.scm
index 3823de7c1e..2dc56b8af9 100644
--- a/tests/syscalls.scm
+++ b/tests/syscalls.scm
@@ -73,21 +73,21 @@
       ;; Note: 'utimensat' does not change 'ctime'.
       (list (stat:mtime st) (stat:atime st)))))
 
-(test-assert "swapon, ENOENT/EPERM"
+(test-assert "swapon, ENOSYS/ENOENT/EPERM"
   (catch 'system-error
     (lambda ()
       (swapon "/does-not-exist")
       #f)
     (lambda args
-      (memv (system-error-errno args) (list EPERM ENOENT)))))
+      (memv (system-error-errno args) (list EPERM ENOENT ENOSYS)))))
 
-(test-assert "swapoff, ENOENT/EINVAL/EPERM"
+(test-assert "swapoff, ENOSYS/ENOENT/EINVAL/EPERM"
   (catch 'system-error
     (lambda ()
       (swapoff "/does-not-exist")
       #f)
     (lambda args
-      (memv (system-error-errno args) (list EPERM EINVAL ENOENT)))))
+      (memv (system-error-errno args) (list EPERM EINVAL ENOENT ENOSYS)))))
 
 (test-assert "mkdtemp!"
   (let* ((tmp (or (getenv "TMPDIR") "/tmp"))
-- 
2.26.2