uml: tests: Skip some tests which cannot work with the UML backend.

tests/disk-labels/test-disk-labels.pl

@@ -25,6 +25,11 @@ use Sys::Guestfs;
 
 exit 77 if $ENV{SKIP_TEST_DISK_LABELS_PL};
 
+if (Sys::Guestfs->new()->get_backend() eq "uml") {
+    print "$0: test skipped because UML backend does not support disk labels\n";
+    exit 77
+}
+
 my $g = Sys::Guestfs->new ();
 
 # Add two drives.

tests/nbd/test-nbd.pl

@@ -26,6 +26,11 @@ my $disk = "../guests/fedora.img";
 
 exit 77 if $ENV{SKIP_TEST_NBD_PL};
 
+if (Sys::Guestfs->new()->get_backend() eq "uml") {
+    print "$0: test skipped because UML backend does not support NBD\n";
+    exit 77
+}
+
 # Check we have qemu-nbd.
 if (system ("qemu-nbd --help >/dev/null 2>&1") != 0) {
     print "$0: test skipped because qemu-nbd program not found\n";

tests/regressions/rhbz690819.sh

@@ -34,6 +34,11 @@ if [[ "$backend" =~ ^libvirt ]]; then
     exit 77
 fi
 
+if [ "$backend" = "uml" ]; then
+    echo "$0: test skipped because uml backend does not support 'iface' param."
+    exit 77
+fi
+
 rm -f rhbz690819.img
 
 ../../fish/guestfish sparse rhbz690819.img 100M

tests/regressions/rhbz975797.sh

@@ -34,6 +34,11 @@ if [[ "$backend" =~ ^libvirt ]]; then
     exit 77
 fi
 
+if [ "$backend" = "uml" ]; then
+    echo "$0: test skipped because uml backend does not support 'iface' param."
+    exit 77
+fi
+
 rm -f rhbz975797-*.img
 
 # The timeout utility was not available in RHEL 5.

tests/rsync/test-rsync.sh

@@ -35,6 +35,11 @@ if ! rsync --help >/dev/null 2>&1; then
     exit 77
 fi
 
+if [ "$($guestfish get-backend)" = "uml" ]; then
+    echo "$0: skipping test because networking is not available in the UML backend"
+    exit 77
+fi
+
 # If rsync is not available, bail.
 if ! $guestfish -a /dev/null run : available rsync; then
     echo "$0: skipping test because rsync is not available in the appliance"