Pass virSecurityManagerPtr object further down into LXC setup code

Currently the lxcContainerSetupMounts method uses the
virSecurityManagerPtr instance to obtain the mount options
string and then only passes the string down into methods
it calls. As functionality in LXC grows though, those
methods need to have direct access to the virSecurityManagerPtr
instance. So push the code down a level.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/lxc/lxc_container.c

@@ -1511,17 +1511,21 @@ static int lxcContainerSetupPivotRoot(virDomainDefPtr vmDef,
                                       virDomainFSDefPtr root,
                                       char **ttyPaths,
                                       size_t nttyPaths,
-                                      char *sec_mount_options)
+                                      virSecurityManagerPtr securityDriver)
 {
     struct lxcContainerCGroup *mounts = NULL;
     size_t nmounts = 0;
     int ret = -1;
-    char *cgroupRoot;
+    char *cgroupRoot = NULL;
+    char *sec_mount_options;
+
+    if (!(sec_mount_options = virSecurityManagerGetMountOptions(securityDriver, vmDef)))
+        return -1;
 
     /* Before pivoting we need to identify any
      * cgroups controllers that are mounted */
     if (lxcContainerIdentifyCGroups(&mounts, &nmounts, &cgroupRoot) < 0)
-        return -1;
+        goto cleanup;
 
     /* Gives us a private root, leaving all parent OS mounts on /.oldroot */
     if (lxcContainerPivotRoot(root) < 0)
@@ -1577,6 +1581,7 @@ static int lxcContainerSetupPivotRoot(virDomainDefPtr vmDef,
 cleanup:
     lxcContainerCGroupFree(mounts, nmounts);
     VIR_FREE(cgroupRoot);
+    VIR_FREE(sec_mount_options);
     return ret;
 }
 
@@ -1585,14 +1590,19 @@ cleanup:
    but with extra stuff mapped in */
 static int lxcContainerSetupExtraMounts(virDomainDefPtr vmDef,
                                         virDomainFSDefPtr root,
-                                        char *sec_mount_options)
+                                        virSecurityManagerPtr securityDriver)
 {
     int ret = -1;
     struct lxcContainerCGroup *mounts = NULL;
     size_t nmounts = 0;
-    char *cgroupRoot;
+    char *cgroupRoot = NULL;
+    char *sec_mount_options;
 
     VIR_DEBUG("def=%p", vmDef);
+
+    if (!(sec_mount_options = virSecurityManagerGetMountOptions(securityDriver, vmDef)))
+        return -1;
+
     /*
      * This makes sure that any new filesystems in the
      * host OS propagate to the container, but any
@@ -1601,25 +1611,25 @@ static int lxcContainerSetupExtraMounts(virDomainDefPtr vmDef,
     if (mount("", "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
         virReportSystemError(errno, "%s",
                              _("Failed to make / slave"));
-        return -1;
+        goto cleanup;
     }
 
     if (root && root->readonly) {
         if (mount("", "/", NULL, MS_BIND|MS_REC|MS_RDONLY|MS_REMOUNT, NULL) < 0) {
             virReportSystemError(errno, "%s",
                                  _("Failed to make root readonly"));
-            return -1;
+            goto cleanup;
         }
     }
 
     VIR_DEBUG("Mounting config FS");
     if (lxcContainerMountAllFS(vmDef, "", false, sec_mount_options) < 0)
-        return -1;
+        goto cleanup;
 
     /* Before replacing /sys we need to identify any
      * cgroups controllers that are mounted */
     if (lxcContainerIdentifyCGroups(&mounts, &nmounts, &cgroupRoot) < 0)
-        return -1;
+        goto cleanup;
 
 #if HAVE_SELINUX
     /* Some versions of Linux kernel don't let you overmount
@@ -1653,6 +1663,7 @@ static int lxcContainerSetupExtraMounts(virDomainDefPtr vmDef,
 cleanup:
     lxcContainerCGroupFree(mounts, nmounts);
     VIR_FREE(cgroupRoot);
+    VIR_FREE(sec_mount_options);
     return ret;
 }
 
@@ -1684,21 +1695,15 @@ static int lxcContainerSetupMounts(virDomainDefPtr vmDef,
                                    size_t nttyPaths,
                                    virSecurityManagerPtr securityDriver)
 {
-    int rc = -1;
-    char *sec_mount_options = NULL;
     if (lxcContainerResolveSymlinks(vmDef) < 0)
         return -1;
 
-    if (!(sec_mount_options = virSecurityManagerGetMountOptions(securityDriver, vmDef)))
-        return -1;
-
     if (root && root->src)
-        rc =  lxcContainerSetupPivotRoot(vmDef, root, ttyPaths, nttyPaths, sec_mount_options);
+        return  lxcContainerSetupPivotRoot(vmDef, root, ttyPaths, nttyPaths,
+                                           securityDriver);
     else
-        rc = lxcContainerSetupExtraMounts(vmDef, root, sec_mount_options);
-
-    VIR_FREE(sec_mount_options);
-    return rc;
+        return lxcContainerSetupExtraMounts(vmDef, root,
+                                            securityDriver);
 }