[libvirt PATCH 23/33] conf: Change handling for empty NVRAM path

[Andrea Bolognani <abologna@xxxxxxxxxx>]

Right now, this results in loader->nvram being NULL, which is
reasonable: loader->nvramTemplate is stored separately, so if
the <nvram> element doesn't contain a path there is really no
useful information inside it.

However, this is about to change, so we will find ourselves
needing to hold on to loader->nvram even when no path is
present. Change the firmware handling code so that such a
scenario is dealt with appropriately.

Signed-off-by: Andrea Bolognani <abologna@xxxxxxxxxx>
---
 src/conf/domain_conf.c   | 9 +++------
 src/qemu/qemu_firmware.c | 7 ++++++-
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 8117cff83e..30a3261dab 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -16766,16 +16766,13 @@ virDomainLoaderDefParseXMLNvram(virDomainLoaderDef *loader,
         return -1;
 
     if (!typePresent) {
-        g_autofree char *path = NULL;
-
-        if (!(path = virXMLNodeContentString(nvramNode)))
+        if (!(src->path = virXMLNodeContentString(nvramNode)))
             return -1;
 
-        if (STREQ(path, ""))
-            return 0;
+        if (STREQ(src->path, ""))
+            VIR_FREE(src->path);
 
         src->type = VIR_STORAGE_TYPE_FILE;
-        src->path = g_steal_pointer(&path);
     } else {
         if (!nvramSourceNode)
             return -1;
diff --git a/src/qemu/qemu_firmware.c b/src/qemu/qemu_firmware.c
index ac1ae1e923..4d34062ebf 100644
--- a/src/qemu/qemu_firmware.c
+++ b/src/qemu/qemu_firmware.c
@@ -997,9 +997,14 @@ qemuFirmwareEnsureNVRAM(virDomainDef *def,
     if (!loader)
         return;
 
-    if (loader->nvram)
+    /* If the source already exists and is fully specified, including
+     * the path, leave it alone */
+    if (loader->nvram && loader->nvram->path)
         return;
 
+    if (loader->nvram)
+        virObjectUnref(loader->nvram);
+
     loader->nvram = virStorageSourceNew();
     loader->nvram->type = VIR_STORAGE_TYPE_FILE;
     loader->nvram->format = VIR_STORAGE_FILE_RAW;
-- 
2.39.1