vircgrouptest: call virCgroupDetectMounts directly

Because we can set which files to return for cgroup tests there
is no need to have special function tailored to run tests.
Reviewed-by: NFabiano Fidêncio <fidencio@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

src/libvirt_private.syms

@@ -1513,7 +1513,7 @@ virCgroupDelThread;
 virCgroupDenyAllDevices;
 virCgroupDenyDevice;
 virCgroupDenyDevicePath;
-virCgroupDetectMountsFromFile;
+virCgroupDetectMounts;
 virCgroupFree;
 virCgroupGetBlkioDeviceReadBps;
 virCgroupGetBlkioDeviceReadIops;

src/util/vircgroup.c

@@ -426,9 +426,7 @@ virCgroupMountOptsMatchController(const char *mntOpts,
  * mounted and where
  */
 int
-virCgroupDetectMountsFromFile(virCgroupPtr group,
-                              const char *path,
-                              bool checkLinks)
+virCgroupDetectMounts(virCgroupPtr group)
 {
     size_t i;
     FILE *mounts = NULL;
@@ -436,9 +434,9 @@ virCgroupDetectMountsFromFile(virCgroupPtr group,
     char buf[CGROUP_MAX_VAL];
     int ret = -1;
 
-    mounts = fopen(path, "r");
+    mounts = fopen("/proc/mounts", "r");
     if (mounts == NULL) {
-        virReportSystemError(errno, _("Unable to open %s"), path);
+        virReportSystemError(errno, "%s", _("Unable to open /proc/mounts"));
         return -1;
     }
 
@@ -466,8 +464,7 @@ virCgroupDetectMountsFromFile(virCgroupPtr group,
 
                 /* If it is a co-mount it has a filename like "cpu,cpuacct"
                  * and we must identify the symlink path */
-                if (checkLinks &&
-                    virCgroupResolveMountLink(entry.mnt_dir, typestr,
+                if (virCgroupResolveMountLink(entry.mnt_dir, typestr,
                                               controller) < 0) {
                     goto cleanup;
                 }
@@ -481,12 +478,6 @@ virCgroupDetectMountsFromFile(virCgroupPtr group,
     return ret;
 }
 
-static int
-virCgroupDetectMounts(virCgroupPtr group)
-{
-    return virCgroupDetectMountsFromFile(group, "/proc/mounts", true);
-}
-
 
 static int
 virCgroupCopyPlacement(virCgroupPtr group,
@@ -4086,9 +4077,7 @@ virCgroupAvailable(void)
 
 
 int
-virCgroupDetectMountsFromFile(virCgroupPtr group ATTRIBUTE_UNUSED,
-                              const char *path ATTRIBUTE_UNUSED,
-                              bool checkLinks ATTRIBUTE_UNUSED)
+virCgroupDetectMounts(virCgroupPtr group ATTRIBUTE_UNUSED)
 {
     virReportSystemError(ENXIO, "%s",
                          _("Control groups not supported on this platform"));

src/util/vircgrouppriv.h

@@ -50,9 +50,7 @@ struct _virCgroup {
     virCgroupController controllers[VIR_CGROUP_CONTROLLER_LAST];
 };
 
-int virCgroupDetectMountsFromFile(virCgroupPtr group,
-                                  const char *path,
-                                  bool checkLinks);
+int virCgroupDetectMounts(virCgroupPtr group);
 
 int virCgroupNewPartition(const char *path,
                           bool create,

tests/vircgrouptest.c

@@ -163,21 +163,21 @@ testCgroupDetectMounts(const void *args)
 {
     int result = -1;
     const char *file = args;
-    char *mounts = NULL;
     char *parsed = NULL;
     const char *actual;
     virCgroupPtr group = NULL;
     virBuffer buf = VIR_BUFFER_INITIALIZER;
     size_t i;
 
-    if (virAsprintf(&mounts, "%s/vircgroupdata/%s.mounts",
-                    abs_srcdir, file) < 0 ||
-        virAsprintf(&parsed, "%s/vircgroupdata/%s.parsed",
-                    abs_srcdir, file) < 0 ||
-        VIR_ALLOC(group) < 0)
+    setenv("VIR_CGROUP_MOCK_FILENAME", file, 1);
+
+    if (virAsprintf(&parsed, "%s/vircgroupdata/%s.parsed", abs_srcdir, file) < 0)
+        goto cleanup;
+
+    if (VIR_ALLOC(group) < 0)
         goto cleanup;
 
-    if (virCgroupDetectMountsFromFile(group, mounts, false) < 0)
+    if (virCgroupDetectMounts(group) < 0)
         goto cleanup;
 
     for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
@@ -195,7 +195,7 @@ testCgroupDetectMounts(const void *args)
     result = 0;
 
  cleanup:
-    VIR_FREE(mounts);
+    unsetenv("VIR_CGROUP_MOCK_FILENAME");
     VIR_FREE(parsed);
     virCgroupFree(&group);
     virBufferFreeAndReset(&buf);