Update FSF address.

[libguestfs.git] / daemon / swap.c

diff --git a/daemon/swap.c b/daemon/swap.c
index 9077814..51dbbe4 100644 (file)
--- a/daemon/swap.c
+++ b/daemon/swap.c
@@ -13,7 +13,7 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #include <config.h>
@@ -28,6 +28,8 @@
 #include "actions.h"
 #include "optgroups.h"
 
+#include "ignore-value.h"
+
 /* Confirmed this is true for Linux swap partitions from the Linux sources. */
 #define SWAP_LABEL_MAX 16
 
@@ -41,8 +43,13 @@ optgroup_linuxfsuuid_available (void)
   char *err;
   int av;
 
-  /* Ignore return code - mkswap --help *will* fail. */
-  command (NULL, &err, "mkswap", "--help", NULL);
+  /* Upstream util-linux have been gradually changing '--help' to go
+   * from stderr to stdout, and changing the return code from 1 to 0.
+   * Thus we need to fold stdout and stderr together, and ignore the
+   * return code.
+   */
+  ignore_value (commandf (NULL, &err, COMMAND_FLAG_FOLD_STDOUT_ON_STDERR,
+                          "mkswap", "--help", NULL));
 
   av = strstr (err, "-U") != NULL;
   free (err);