virsh: Work around virSecretFree quirks

Similarly to other libvirt object freeing APIs the function resets the
libvirt error when called and doesn't take NULL gracefully. Install the
workaround and g_autoptr handlers similarly to the 'virshDomain' type.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

build-aux/syntax-check.mk

@@ -1118,7 +1118,7 @@ sc_gettext_init:
 	  $(_sc_search_regexp)
 
 sc_prohibit_obj_free_apis_in_virsh:
-	@prohibit='\bvir(Domain|DomainSnapshot)Free\b' \
+	@prohibit='\bvir(Domain|DomainSnapshot|Secret)Free\b' \
 	in_vc_files='virsh.*\.[ch]$$' \
 	exclude='sc_prohibit_obj_free_apis_in_virsh' \
 	halt='avoid using virDomain(Snapshot)Free in virsh, use virsh-prefixed wrappers instead' \

tools/virsh-completer-secret.c

@@ -23,6 +23,7 @@
 #include "virsh-completer-secret.h"
 #include "viralloc.h"
 #include "virsh-secret.h"
+#include "virsh-util.h"
 #include "virsh.h"
 #include "virstring.h"
 
@@ -61,7 +62,7 @@ virshSecretUUIDCompleter(vshControl *ctl,
 
  cleanup:
     for (i = 0; i < nsecrets; i++)
-        virSecretFree(secrets[i]);
+        virshSecretFree(secrets[i]);
     VIR_FREE(secrets);
     return ret;
 }

tools/virsh-secret.c

@@ -20,6 +20,7 @@
 
 #include <config.h>
 #include "virsh-secret.h"
+#include "virsh-util.h"
 
 #include "internal.h"
 #include "virbuffer.h"
@@ -106,8 +107,7 @@ cmdSecretDefine(vshControl *ctl, const vshCmd *cmd)
 
  cleanup:
     VIR_FREE(buffer);
-    if (res)
-        virSecretFree(res);
+    virshSecretFree(res);
     return ret;
 }
 
@@ -153,7 +153,7 @@ cmdSecretDumpXML(vshControl *ctl, const vshCmd *cmd)
     ret = true;
 
  cleanup:
-    virSecretFree(secret);
+    virshSecretFree(secret);
     return ret;
 }
 
@@ -215,7 +215,7 @@ cmdSecretSetValue(vshControl *ctl, const vshCmd *cmd)
     ret = true;
 
  cleanup:
-    virSecretFree(secret);
+    virshSecretFree(secret);
     return ret;
 }
 
@@ -266,7 +266,7 @@ cmdSecretGetValue(vshControl *ctl, const vshCmd *cmd)
 
  cleanup:
     VIR_DISPOSE_N(value, value_size);
-    virSecretFree(secret);
+    virshSecretFree(secret);
     return ret;
 }
 
@@ -312,7 +312,7 @@ cmdSecretUndefine(vshControl *ctl, const vshCmd *cmd)
     ret = true;
 
  cleanup:
-    virSecretFree(secret);
+    virshSecretFree(secret);
     return ret;
 }
 
@@ -348,10 +348,9 @@ virshSecretListFree(virshSecretListPtr list)
     size_t i;
 
     if (list && list->secrets) {
-        for (i = 0; i < list->nsecrets; i++) {
-            if (list->secrets[i])
-                virSecretFree(list->secrets[i]);
-        }
+        for (i = 0; i < list->nsecrets; i++)
+            virshSecretFree(list->secrets[i]);
+
         VIR_FREE(list->secrets);
     }
     VIR_FREE(list);
@@ -763,8 +762,7 @@ cmdSecretEvent(vshControl *ctl, const vshCmd *cmd)
     if (eventId >= 0 &&
         virConnectSecretEventDeregisterAny(priv->conn, eventId) < 0)
         ret = false;
-    if (secret)
-        virSecretFree(secret);
+    virshSecretFree(secret);
     return ret;
 }
 

tools/virsh-util.c

@@ -250,6 +250,17 @@ virshDomainSnapshotFree(virDomainSnapshotPtr snap)
 }
 
 
+void
+virshSecretFree(virSecretPtr secret)
+{
+    if (!secret)
+        return;
+
+    vshSaveLibvirtHelperError();
+    virSecretFree(secret); /* sc_prohibit_obj_free_apis_in_virsh */
+}
+
+
 int
 virshDomainGetXMLFromDom(vshControl *ctl,
                          virDomainPtr dom,

tools/virsh-util.h

@@ -45,6 +45,11 @@ void
 virshDomainFree(virDomainPtr dom);
 G_DEFINE_AUTOPTR_CLEANUP_FUNC(virshDomain, virshDomainFree);
 
+typedef virSecret virshSecret;
+void
+virshSecretFree(virSecretPtr secret);
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(virshSecret, virshSecretFree);
+
 void
 virshDomainCheckpointFree(virDomainCheckpointPtr chk);