Libvirt lose sheepdogs volumes on pool refresh or restart.

When restarting sheepdog pool, all volumes are missing.
This patch add automatically all volume from the added pool.

Adding last Daniel P. Berrange's syntaxes correction.
Adding vol on separeted function 'inspired' from parallels_storage :
parallelsAddDiskVolume

src/storage/storage_backend_sheepdog.c

@@ -109,22 +109,104 @@ virStorageBackendSheepdogAddHostArg(virCommandPtr cmd,
     virCommandAddArgFormat(cmd, "%d", port);
 }
 
+static int
+virStorageBackendSheepdogAddVolume(virConnectPtr conn ATTRIBUTE_UNUSED,
+                                  virStoragePoolObjPtr pool, const char *diskInfo)
+{
+    virStorageVolDefPtr vol = NULL;
+
+    if (diskInfo == NULL) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("Missing disk info when adding volume"));
+        goto error;
+    }
+
+    if (VIR_ALLOC(vol) < 0 || VIR_STRDUP(vol->name, diskInfo) < 0)
+        goto error;
+
+    vol->type = VIR_STORAGE_VOL_NETWORK;
+
+    if (virStorageBackendSheepdogRefreshVol(conn, pool, vol) < 0)
+        goto error;
+
+    if (VIR_EXPAND_N(pool->volumes.objs, pool->volumes.count, 1) < 0)
+        goto error;
+
+    pool->volumes.objs[pool->volumes.count - 1] = vol;
+
+    return 0;
+
+error:
+    virStorageVolDefFree(vol);
+    return -1;
+}
+
+static int
+virStorageBackendSheepdogRefreshAllVol(virConnectPtr conn ATTRIBUTE_UNUSED,
+                                       virStoragePoolObjPtr pool)
+{
+    int ret = -1;
+    char *output = NULL;
+    char **lines = NULL;
+    char **cells = NULL;
+    size_t i;
+
+    virCommandPtr cmd = virCommandNewArgList(COLLIE, "vdi", "list", "-r", NULL);
+    virStorageBackendSheepdogAddHostArg(cmd, pool);
+    virCommandSetOutputBuffer(cmd, &output);
+    if (virCommandRun(cmd, NULL) < 0)
+        goto cleanup;
+
+    lines = virStringSplit(output, "\n", 0);
+    if (lines == NULL)
+        goto cleanup;
+
+    for (i = 0; lines[i]; i++) {
+        const char *line = lines[i];
+        if (line == NULL)
+            break;
+
+        cells = virStringSplit(line, " ", 0);
+
+        if (cells != NULL && virStringListLength(cells) > 2) {
+            if (virStorageBackendSheepdogAddVolume(conn, pool, cells[1]) < 0)
+                goto cleanup;
+        }
+
+        virStringFreeList(cells);
+        cells = NULL;
+    }
+
+    ret = 0;
+
+cleanup:
+    virCommandFree(cmd);
+    virStringFreeList(lines);
+    virStringFreeList(cells);
+    VIR_FREE(output);
+    return ret;
+}
+
 
 static int
 virStorageBackendSheepdogRefreshPool(virConnectPtr conn ATTRIBUTE_UNUSED,
                                      virStoragePoolObjPtr pool)
 {
-    int ret;
+    int ret = -1;
     char *output = NULL;
     virCommandPtr cmd;
 
     cmd = virCommandNewArgList(COLLIE, "node", "info", "-r", NULL);
     virStorageBackendSheepdogAddHostArg(cmd, pool);
     virCommandSetOutputBuffer(cmd, &output);
-    ret = virCommandRun(cmd, NULL);
-    if (ret == 0)
-        ret = virStorageBackendSheepdogParseNodeInfo(pool->def, output);
+    if (virCommandRun(cmd, NULL) < 0)
+        goto cleanup;
 
+    if (virStorageBackendSheepdogParseNodeInfo(pool->def, output) < 0)
+        goto cleanup;
+
+    ret = virStorageBackendSheepdogRefreshAllVol(conn, pool);
+cleanup:
     virCommandFree(cmd);
     VIR_FREE(output);
     return ret;