sysinfotest: Move from custom dmidecode scripts to virCommandSetDryRun()

Problem with custom dmidecode scripts is that they are hard to
modify, especially if we will want them to act differently based
on passed arguments. So far, we have two scripts which do no more
than 'cat $sysinfo' where $sysinfo is saved dmidecode output.

The virCommandSetDryRun() can be used to trick
virSysinfoReadDMI() thinking it executed real dmidecode.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

src/util/virsysinfo.c

@@ -60,7 +60,8 @@ virSysinfoSetup(const char *dmidecode,
                 const char *sysinfo,
                 const char *cpuinfo)
 {
-    sysinfoDmidecode = dmidecode;
+    if (dmidecode)
+        sysinfoDmidecode = dmidecode;
     sysinfoSysinfo = sysinfo;
     sysinfoCpuinfo = cpuinfo;
 }

tests/sysinfodata/aarch64-gigabytedmidecode.sh

-#!/bin/sh
-DATAFILE=`dirname $0`/aarch64-gigabytesysinfo.data
-cat $DATAFILE

tests/sysinfodata/x86dmidecode.sh

-#!/bin/sh
-DATAFILE=`dirname $0`/x86sysinfo.data
-cat $DATAFILE

tests/sysinfotest.c

@@ -34,14 +34,39 @@
 #define LIBVIRT_VIRSYSINFOPRIV_H_ALLOW
 #include "virsysinfopriv.h"
 
+#define LIBVIRT_VIRCOMMANDPRIV_H_ALLOW
+#include "vircommandpriv.h"
+
 #define VIR_FROM_THIS VIR_FROM_NONE
 
 struct testSysinfoData {
     const char *name; /* test name, also base name for result files */
     virSysinfoDefPtr (*func)(void); /* sysinfo gathering function */
-    const char *decoder; /* name of dmi decoder binary/script */
 };
 
+
+static void
+testDMIDecodeDryRun(const char *const*args G_GNUC_UNUSED,
+                    const char *const*env G_GNUC_UNUSED,
+                    const char *input G_GNUC_UNUSED,
+                    char **output,
+                    char **error,
+                    int *status,
+                    void *opaque)
+{
+    const char *sysinfo = opaque;
+
+    if (virFileReadAll(sysinfo, 10 * 1024 * 1024, output) < 0) {
+        *error = g_strdup(virGetLastErrorMessage());
+        *status = EXIT_FAILURE;
+        return;
+    }
+
+    *error = g_strdup("");
+    *status = 0;
+}
+
+
 static int
 testSysinfo(const void *data)
 {
@@ -52,18 +77,19 @@ testSysinfo(const void *data)
     g_autofree char *sysinfo = NULL;
     g_autofree char *cpuinfo = NULL;
     g_autofree char *expected = NULL;
-    g_autofree char *decoder = NULL;
 
     sysinfo = g_strdup_printf("%s/sysinfodata/%ssysinfo.data", abs_srcdir, testdata->name);
     cpuinfo = g_strdup_printf("%s/sysinfodata/%scpuinfo.data", abs_srcdir, testdata->name);
     expected = g_strdup_printf("%s/sysinfodata/%ssysinfo.expect", abs_srcdir, testdata->name);
 
-    if (testdata->decoder)
-        decoder = g_strdup_printf("%s/%s", abs_srcdir, testdata->decoder);
+    virCommandSetDryRun(NULL, testDMIDecodeDryRun, sysinfo);
+
+    virSysinfoSetup(NULL, sysinfo, cpuinfo);
 
-    virSysinfoSetup(decoder, sysinfo, cpuinfo);
+    ret = testdata->func();
+    virCommandSetDryRun(NULL, NULL, NULL);
 
-    if (!(ret = testdata->func()))
+    if (!ret)
         return -1;
 
     if (virSysinfoFormat(&buf, ret) < 0)
@@ -76,17 +102,13 @@ testSysinfo(const void *data)
 }
 
 
-#define TEST_FULL(name, func, decoder) \
+#define TEST(name, func) \
     do { \
-        struct testSysinfoData data = { name, func, decoder }; \
+        struct testSysinfoData data = { name, func }; \
         if (virTestRun(name " sysinfo", testSysinfo, &data) < 0) \
             ret = EXIT_FAILURE; \
     } while (0)
 
-
-#define TEST(name, func) \
-        TEST_FULL(name, func, NULL)
-
 static int
 mymain(void)
 {
@@ -95,13 +117,12 @@ mymain(void)
     TEST("s390", virSysinfoReadS390);
     TEST("s390-freq", virSysinfoReadS390);
     TEST("ppc", virSysinfoReadPPC);
-    TEST_FULL("x86", virSysinfoReadDMI, "/sysinfodata/x86dmidecode.sh");
+    TEST("x86", virSysinfoReadDMI);
     TEST("arm", virSysinfoReadARM);
     TEST("arm-rpi2", virSysinfoReadARM);
     TEST("aarch64", virSysinfoReadARM);
     TEST("aarch64-moonshot", virSysinfoReadARM);
-    TEST_FULL("aarch64-gigabyte", virSysinfoReadARM,
-              "/sysinfodata/aarch64-gigabytedmidecode.sh");
+    TEST("aarch64-gigabyte", virSysinfoReadARM);
 
     return ret;
 }