bug#42111: tests/syscalls.scm stumbles on network interface aliases

[Marius Bakke]

Hello,

The "network-interface-names" test from tests/syscalls.scm fails if a
network interface alias is configured.

I.e. this command:

  ip addr add 127.0.0.2/8 dev lo label lo:lcat

causes the interface to show up in (network-interface-names), but not
(all-network-interface-names), breaking the test.

I could not find a procfs file that displays network aliases, so ISTM
we either need to add syscalls to check IFLA_IFALIAS, or simply ignore
interfaces with a colon (which seems to be required).

This patch does the latter and makes the test succeed:

diff --git a/tests/syscalls.scm b/tests/syscalls.scm
index 6acaa0b131..7aa16ce3f4 100644
--- a/tests/syscalls.scm
+++ b/tests/syscalls.scm
@@ -382,7 +382,10 @@
      (member "lo" names))))
 
 (test-assert "network-interface-names"
-  (match (network-interface-names)
+  (match (filter (lambda (if)
+                   ;; Ignore interface aliases.
+                   (not (string-contains if ":")))
+                 (network-interface-names))
     (((? string? names) ..1)
      (lset<= string=? names (all-network-interface-names)))))

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