tests: Add virnumamock

All mocked functions are related to numactl/virNuma and rely only on
virsysfs, so the paths they touch can be nicely controlled.  And
because it is so nicely self-contained NUMA mock, it is named
numamock (instead of naming it after the test that will use it first).

We need top level API mock because some APIs might call libnuma
directly, e.g. virNumaIsAvailable(), virNumaGetMaxNode().
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

tests/Makefile.am

@@ -206,6 +206,7 @@ test_libraries = libshunload.la \
 	virnetdevmock.la \
 	virrandommock.la \
 	virhostcpumock.la \
+	virnumamock.la \
 	domaincapsmock.la \
 	$(NULL)
 
@@ -1124,6 +1125,12 @@ virhostcpumock_la_CFLAGS = $(AM_CFLAGS)
 virhostcpumock_la_LDFLAGS = $(MOCKLIBS_LDFLAGS)
 virhostcpumock_la_LIBADD = $(MOCKLIBS_LIBS)
 
+virnumamock_la_SOURCES = \
+	virnumamock.c
+virnumamock_la_CFLAGS = $(AM_CFLAGS)
+virnumamock_la_LDFLAGS = $(MOCKLIBS_LDFLAGS)
+virnumamock_la_LIBADD = $(MOCKLIBS_LIBS)
+
 if WITH_NSS
 nsstest_SOURCES = \
 	nsstest.c testutils.h testutils.c

tests/virnumamock.c

+/*
+ * virnumamock.c: Mock some virNuma functions using virsysfs
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+
+#include "internal.h"
+#include "virmock.h"
+#include "virnuma.h"
+#include "virfile.h"
+#include "viralloc.h"
+#include "virstring.h"
+#include "virsysfspriv.h"
+
+#define VIR_FROM_THIS VIR_FROM_NONE
+
+static int numa_avail = -1;
+
+
+/*
+ * Poor man's mocked NUMA guesser.  We basically check if
+ * /sys/devices/system/node (where /sys/devices/system can already be mocked or
+ * changed in the tests) exists and cache the result.
+ */
+bool
+virNumaIsAvailable(void)
+{
+    if (numa_avail < 0) {
+        char *sysfs_node_path = NULL;
+
+        if (virAsprintfQuiet(&sysfs_node_path, "%s/node", virSysfsGetSystemPath()) < 0)
+            return false;
+
+        numa_avail = virFileExists(sysfs_node_path);
+
+        VIR_FREE(sysfs_node_path);
+    }
+
+    /*
+     * Quite a few more things need to be mocked if NUMA is not available and
+     * you are using this file.  Do not remove the abort() call below unless you
+     * make sure all under virCapabilitiesInitNUMAFake() is mocked (and whatever
+     * might have changed since this comment was added.  You are welcome.
+     */
+    if (!numa_avail)
+        abort();
+
+    return numa_avail;
+}
+
+int
+virNumaGetMaxNode(void)
+{
+    int ret = -1;
+    virBitmapPtr map = NULL;
+
+    if (virSysfsGetValueBitmap("node/online", &map) < 0)
+        return -1;
+
+    ret = virBitmapLastSetBit(map);
+    virBitmapFree(map);
+    return ret;
+}
+
+bool
+virNumaNodeIsAvailable(int node)
+{
+    bool ret = false;
+    virBitmapPtr map = NULL;
+
+    if (virSysfsGetValueBitmap("node/online", &map) < 0)
+        return false;
+
+    ret = virBitmapIsBitSet(map, node);
+    virBitmapFree(map);
+    return ret;
+}
+
+int
+virNumaGetNodeMemory(int node,
+                     unsigned long long *memsize,
+                     unsigned long long *memfree)
+{
+    const unsigned long long base = 1 << 30;
+
+    if (memsize)
+        *memsize = base * (node + 1);
+
+    if (memfree)
+        *memfree = base;
+
+    return 0;
+}
+
+int
+virNumaGetDistances(int node ATTRIBUTE_UNUSED,
+                    int **distances,
+                    int *ndistances)
+{
+    *distances = NULL;
+    *ndistances = 0;
+    return 0;
+}
+
+/*
+ * TODO: Adapt virNumaGetHugePageInfo{Path,Dir} to use virsysfs so that the
+ * paths can be modified and this function can be thrown away and instead we'd
+ * have copied info from /sys (as we do with /sys/devices/system).
+ */
+int
+virNumaGetPages(int node,
+                unsigned int **pages_size,
+                unsigned int **pages_avail,
+                unsigned int **pages_free,
+                size_t *npages)
+{
+    const int pages_def[] = { 4, 2 * 1024, 1 * 1024 * 1024};
+    const int npages_def = ARRAY_CARDINALITY(pages_def);
+    size_t i = 0;
+
+    if (pages_size)
+        *pages_size = NULL;
+
+    if (pages_avail)
+        *pages_avail = NULL;
+
+    if (pages_free)
+        *pages_free = NULL;
+
+    *npages = 0;
+
+    if ((pages_size && VIR_ALLOC_N(*pages_size, npages_def) < 0) ||
+        (pages_avail && VIR_ALLOC_N(*pages_avail, npages_def) < 0) ||
+        (pages_free && VIR_ALLOC_N(*pages_free, npages_def) < 0)) {
+        VIR_FREE(*pages_size);
+        VIR_FREE(*pages_avail);
+        return -1;
+    }
+
+    *npages = npages_def;
+    if (pages_size)
+        memcpy(*pages_size, pages_def, sizeof(pages_def));
+
+    node++;
+    if (node <= 0)
+        node = 32;
+
+    if (pages_avail || pages_free) {
+        for (i = 0; i < *npages; i++) {
+            if (pages_avail)
+                (*pages_avail)[i] = (node + i) * 2 << 10;
+            if (pages_free)
+                (*pages_free)[i] = (node + i) * 1 << 10;
+        }
+    }
+
+    return 0;
+}
+
+int
+virNumaGetNodeCPUs(int node, virBitmapPtr *cpus)
+{
+    int ret = -1;
+    char *cpulist = NULL;
+
+    if (virSysfsGetNodeValueString(node, "cpulist", &cpulist) < 0)
+        return -1;
+
+    *cpus = virBitmapParseUnlimited(cpulist);
+    if (!cpus)
+        goto cleanup;
+
+    ret = virBitmapCountBits(*cpus);
+ cleanup:
+    VIR_FREE(cpulist);
+    return ret;
+}