Add skip_test helper function.

Skip connect-tcp6 test which fails under Koji.

libnbd.spec

@@ -208,31 +208,36 @@ rm $RPM_BUILD_ROOT%{_mandir}/man3/libnbd-golang.3*
 
 
 %check
+function skip_test ()
+{
+    for f in "$@"; do
+        rm -f "$f"
+        echo 'exit 77' > "$f"
+        chmod +x "$f"
+    done
+}
+
 # interop/structured-read.sh fails with the old qemu-nbd in Fedora 29,
 # so disable it there.
 %if 0%{?fedora} <= 29
-rm interop/structured-read.sh
-touch interop/structured-read.sh
-chmod +x interop/structured-read.sh
+skip_test interop/structured-read.sh
 %endif
 
 # interop/interop-qemu-storage-daemon.sh fails in RHEL 9 because of
 # this bug in qemu:
 # https://lists.nongnu.org/archive/html/qemu-devel/2021-03/threads.html#03544
 %if 0%{?rhel}
-rm interop/interop-qemu-storage-daemon.sh
-touch interop/interop-qemu-storage-daemon.sh
-chmod +x interop/interop-qemu-storage-daemon.sh
+skip_test interop/interop-qemu-storage-daemon.sh
 %endif
 
 # All fuse tests fail in Koji with:
 # fusermount: entry for fuse/test-*.d not found in /etc/mtab
 # for unknown reasons but probably related to the Koji environment.
-for f in fuse/test-*.sh; do
-    rm $f
-    touch $f
-    chmod +x $f
-done
+skip_test fuse/test-*.sh
+
+# IPv6 loopback connections fail in Koji.
+make -C tests connect-tcp6
+skip_test tests/connect-tcp6
 
 make %{?_smp_mflags} check || {
     for f in $(find -name test-suite.log); do
@@ -314,6 +319,8 @@ make %{?_smp_mflags} check || {
 * Sat Apr 10 2021 Richard W.M. Jones <rjones@redhat.com> - 1.7.7-1
 - New upstream development version 1.7.7.
 - +BR iproute
+- Add skip_test helper function.
+- Skip connect-tcp6 test which fails under Koji.
 
 * Thu Apr 08 2021 Richard W.M. Jones <rjones@redhat.com> - 1.7.6-1
 - New upstream development version 1.7.6.