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[libvirt] [PATCH 3/3] tests: check domain XML to libxl structures conversion



libxl contains a method to dump libxl_domain_config in json format,
which is really convenient for tests. Unfortunately it require
libxl_ctx, which can be only created when running on Xen (wither in dom0
or domU). Because of this, skip the test in other cases.

For now, have just two tests, including just-introduced CPUID handling,
but this commit introduces a framework for further tests of
src/libxl/libxl_conf.c file.
---
 tests/Makefile.am    |   8 +-
 tests/libxlxmltest.c | 232 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 238 insertions(+), 2 deletions(-)
 create mode 100644 tests/libxlxmltest.c

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 19986dc..06c5c73 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -274,7 +274,7 @@ test_programs += xml2sexprtest sexpr2xmltest \
 endif WITH_XEN
 
 if WITH_LIBXL
-test_programs += xlconfigtest
+test_programs += xlconfigtest libxlxmltest
 endif WITH_LIBXL
 
 if WITH_QEMU
@@ -528,9 +528,13 @@ libxl_LDADDS += $(LDADDS)
 xlconfigtest_SOURCES = \
 	xlconfigtest.c testutilsxen.c testutilsxen.h \
 	testutils.c testutils.h
+libxlxmltest_SOURCES = \
+	libxlxmltest.c testutilsxen.c testutilsxen.h \
+	testutils.c testutils.h
 xlconfigtest_LDADD =$(libxl_LDADDS)
+libxlxmltest_LDADD =$(libxl_LDADDS)
 else ! WITH_LIBXL
-EXTRA_DIST += xlconfigtest.c
+EXTRA_DIST += xlconfigtest.c libxlxmltest.c
 endif ! WITH_LIBXL
 
 QEMUMONITORTESTUTILS_SOURCES = \
diff --git a/tests/libxlxmltest.c b/tests/libxlxmltest.c
new file mode 100644
index 0000000..7e11af4
--- /dev/null
+++ b/tests/libxlxmltest.c
@@ -0,0 +1,232 @@
+/*
+ * libxlxmltest.c: Test xl.cfg(5) <-> libxl_domain_config conversion
+ *
+ * Copyright (C) 2007, 2010-2011, 2014 Red Hat, Inc.
+ * Copyright (c) 2015 SUSE LINUX Products GmbH, Nuernberg, Germany.
+ *
+ * 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/>.
+ *
+ * Author: Daniel P. Berrange <berrange redhat com>
+ * Author: Kiarie Kahurani <davidkiarie4 gmail com>
+ * Author: Marek Marczykowski-Górecki <marmarek invisiblethingslab com>
+ *
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#ifdef WITH_YAJL2
+# define HAVE_YAJL_V2 1
+#endif
+#include <libxl.h>
+#include <libxl_json.h>
+
+#include "internal.h"
+#include "datatypes.h"
+#include "viralloc.h"
+#include "virstring.h"
+#include "testutils.h"
+#include "testutilsxen.h"
+#include "libxl/libxl_conf.h"
+
+#define VIR_FROM_THIS VIR_FROM_NONE
+
+static virCapsPtr caps;
+static virDomainXMLOptionPtr xmlopt;
+xentoollog_logger_stdiostream *logger;
+libxl_ctx *ctx;
+
+
+/*
+ * This function provides a mechanism to replace variables in test
+ * data files whose values are discovered at built time.
+ */
+static char *
+testReplaceVarsXML(const char *xml)
+{
+    char *xmlcfgData;
+    char *replacedXML;
+
+    if (virTestLoadFile(xml, &xmlcfgData) < 0)
+        return NULL;
+
+    replacedXML = virStringReplace(xmlcfgData, "/LIBXL_FIRMWARE_DIR",
+                                   LIBXL_FIRMWARE_DIR);
+
+    /* libxl driver checks for emulator existence */
+    replacedXML = virStringReplace(xmlcfgData, "/usr/lib/xen/bin/qemu-system-i386",
+                                   "/bin/true");
+
+    VIR_FREE(xmlcfgData);
+    return replacedXML;
+}
+
+/*
+ * Parses domXML to virDomainDef object, which is then converted to json
+ * config and compared with expected config.
+ */
+static int
+testCompareParseXML(const char *json, const char *xml, bool replaceVars)
+{
+    char *gotjsonData = NULL;
+    virConfPtr conf = NULL;
+    virConnectPtr conn = NULL;
+    size_t wrote = 0;
+    int ret = -1;
+    virDomainDefPtr def = NULL;
+    char *replacedXML = NULL;
+    virPortAllocatorPtr reservedGraphicsPorts = NULL;
+    libxl_domain_config d_config;
+    yajl_gen gen = NULL;
+
+    conn = virGetConnect();
+    if (!conn) goto fail;
+
+    if (replaceVars) {
+        if (!(replacedXML = testReplaceVarsXML(xml)))
+            goto fail;
+        if (!(def = virDomainDefParseString(replacedXML, caps, xmlopt,
+                                            NULL, VIR_DOMAIN_XML_INACTIVE)))
+            goto fail;
+    } else {
+        if (!(def = virDomainDefParseFile(xml, caps, xmlopt,
+                                          NULL, VIR_DOMAIN_XML_INACTIVE)))
+            goto fail;
+    }
+
+    if (!(reservedGraphicsPorts = virPortAllocatorNew("VNC",
+                              LIBXL_VNC_PORT_MIN,
+                              LIBXL_VNC_PORT_MAX,
+                              0)))
+        goto fail;
+
+    if (libxlBuildDomainConfig(reservedGraphicsPorts,
+                def,
+                NULL, /* channelDir, unused in current version */
+                ctx,
+                caps,
+                &d_config))
+        goto fail;
+
+    if (!(gen = libxl_yajl_gen_alloc(NULL)))
+        goto fail;
+
+    if (libxl_domain_config_gen_json(gen, &d_config) != yajl_gen_status_ok)
+        goto fail;
+
+    if (yajl_gen_get_buf(gen,
+                (const unsigned char **)&gotjsonData,
+                &wrote) != yajl_gen_status_ok)
+        goto fail;
+
+    if (virTestCompareToFile(gotjsonData, json) < 0)
+        goto fail;
+
+    ret = 0;
+
+ fail:
+    VIR_FREE(replacedXML);
+    // yajl_gen_free handle also gotjsonData
+    if (gen)
+        yajl_gen_free(gen);
+    if (conf)
+        virConfFree(conf);
+    virObjectUnref(reservedGraphicsPorts);
+    virDomainDefFree(def);
+    virObjectUnref(conn);
+
+    return ret;
+}
+
+struct testInfo {
+    const char *name;
+    bool replaceVars;
+};
+
+static int
+testCompareHelper(const void *data)
+{
+    int result = -1;
+    const struct testInfo *info = data;
+    char *xml = NULL;
+    char *json = NULL;
+
+    if (virAsprintf(&xml, "%s/xlconfigdata/test-%s.xml",
+                    abs_srcdir, info->name) < 0 ||
+        virAsprintf(&json, "%s/xlconfigdata/test-%s.json",
+                    abs_srcdir, info->name) < 0)
+        goto cleanup;
+
+    result = testCompareParseXML(json, xml, info->replaceVars);
+
+ cleanup:
+    VIR_FREE(xml);
+    VIR_FREE(json);
+
+    return result;
+}
+
+
+static int
+mymain(void)
+{
+    int ret = 0;
+
+    logger = xtl_createlogger_stdiostream(stderr, XTL_PROGRESS, 0);
+    if (!logger)
+        return EXIT_FAILURE;
+
+    if (libxl_ctx_alloc(&ctx, LIBXL_VERSION, 0, (xentoollog_logger*)logger))
+        return EXIT_AM_SKIP;
+
+    if (!(caps = testXLInitCaps()))
+        return EXIT_FAILURE;
+
+    if (!(xmlopt = libxlCreateXMLConf()))
+        return EXIT_FAILURE;
+
+#define DO_TEST_PARSE(name, replace)                                    \
+    do {                                                                \
+        struct testInfo info0 = { name, replace };                   \
+        if (virTestRun("Xen XML-2-json Parse  " name,                     \
+                       testCompareHelper, &info0) < 0)                  \
+            ret = -1;                                                   \
+    } while (0)
+
+#define DO_TEST(name)                                                   \
+    do {                                                                \
+        DO_TEST_PARSE(name, false);                                     \
+    } while (0)
+
+#define DO_TEST_REPLACE_VARS(name)                                      \
+    do {                                                                \
+        DO_TEST_PARSE(name, true);                                      \
+    } while (0)
+
+    DO_TEST_REPLACE_VARS("fullvirt-ovmf");
+
+    DO_TEST("fullvirt-cpuid");
+
+    virObjectUnref(caps);
+    virObjectUnref(xmlopt);
+    libxl_ctx_free(ctx);
+    xtl_logger_destroy((xentoollog_logger*)logger);
+
+    return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+}
+
+VIR_TEST_MAIN(mymain)
-- 
git-series 0.9.1


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