maint: improve VIR_ERR_NO_SUPPORT usage

We weren't very consistent in our use of VIR_ERR_NO_SUPPORT; many
users just passed __FUNCTION__ on, while others passed "%s" to
silence over-eager compilers that warn about __FUNCTION__ not
containing any %.  It's nicer to route all these uses through
a single macro, so that if we ever need to change the reporting,
we can do it in one place.

I verified that 'virsh -c test:///default qemu-monitor-command test foo'
gives the same error message before and after this patch:
error: this function is not supported by the connection driver: virDomainQemuMonitorCommand

Note that in libvirt.c, we were inconsistent on whether virDomain*
API used virLibConnError() (with VIR_FROM_NONE) or virLibDomainError()
(with VIR_FROM_DOMAIN); this patch unifies these errors to all use
VIR_FROM_NONE, on the grounds that it is unlikely that a caller
learning that a call is unimplemented can do anything in particular
with extra knowledge of which error domain it belongs to.

One particular change to note is virDomainOpenGraphics which was
trying to fail with VIR_ERR_NO_SUPPORT after a failed
VIR_DRV_SUPPORTS_FEATURE check; all other places that fail a
feature check report VIR_ERR_ARGUMENT_UNSUPPORTED.

* src/util/virerror.h (virReportUnsupportedError): New macro.
* src/libvirt-qemu.c: Use new macro.
* src/libvirt-lxc.c: Likewise.
* src/lxc/lxc_driver.c: Likewise.
* src/security/security_manager.c: Likewise.
* src/util/virinitctl.c: Likewise.
* src/libvirt.c: Likewise.
(virDomainOpenGraphics): Use correct error for unsupported feature.
Signed-off-by: NEric Blake <eblake@redhat.com>

src/libvirt-lxc.c

@@ -99,7 +99,7 @@ virDomainLxcOpenNamespace(virDomainPtr domain,
         return ret;
     }
 
-    virLibConnError(conn, VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
 
 error:
     virDispatchError(conn);

src/libvirt-qemu.c

@@ -105,7 +105,7 @@ virDomainQemuMonitorCommand(virDomainPtr domain, const char *cmd,
         return ret;
     }
 
-    virLibConnError(conn, VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
 
 error:
     virDispatchError(conn);
@@ -180,7 +180,7 @@ virDomainQemuAttach(virConnectPtr conn,
         return ret;
     }
 
-    virLibConnError(conn, VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
 
 error:
     virDispatchError(conn);
@@ -242,9 +242,8 @@ virDomainQemuAgentCommand(virDomainPtr domain,
         return ret;
     }
 
-    virLibConnError(conn, VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
 
-    /* Copy to connection error object for back compatibility */
 error:
     virDispatchError(conn);
     return NULL;

src/lxc/lxc_driver.c

 /*
- * Copyright (C) 2010-2013 Red Hat, Inc.
+ * Copyright (C) 2010-2014 Red Hat, Inc.
  * Copyright IBM Corp. 2008
  *
  * lxc_driver.c: linux container driver functions
@@ -2257,7 +2257,7 @@ lxcDomainInterfaceStats(virDomainPtr dom,
                         const char *path ATTRIBUTE_UNUSED,
                         struct _virDomainInterfaceStats *stats ATTRIBUTE_UNUSED)
 {
-    virReportError(VIR_ERR_NO_SUPPORT, "%s", __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 #endif

src/security/security_manager.c

 /*
  * security_manager.c: Internal security manager API
  *
- * Copyright (C) 2010-2013 Red Hat, Inc.
+ * Copyright (C) 2010-2014 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -256,7 +256,7 @@ virSecurityManagerGetDOI(virSecurityManagerPtr mgr)
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return NULL;
 }
 
@@ -271,7 +271,7 @@ virSecurityManagerGetModel(virSecurityManagerPtr mgr)
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return NULL;
 }
 
@@ -317,7 +317,7 @@ int virSecurityManagerRestoreImageLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -332,7 +332,7 @@ int virSecurityManagerSetDaemonSocketLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -347,7 +347,7 @@ int virSecurityManagerSetSocketLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -362,7 +362,7 @@ int virSecurityManagerClearSocketLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -378,7 +378,7 @@ int virSecurityManagerSetImageLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -395,7 +395,7 @@ int virSecurityManagerRestoreHostdevLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -412,7 +412,7 @@ int virSecurityManagerSetHostdevLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -428,7 +428,7 @@ int virSecurityManagerSetSavedStateLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -444,7 +444,7 @@ int virSecurityManagerRestoreSavedStateLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -512,7 +512,7 @@ int virSecurityManagerGenLabel(virSecurityManagerPtr mgr,
         }
 
         if (!sec_managers[i]->drv->domainGenSecurityLabel) {
-            virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+            virReportUnsupportedError();
         } else {
             /* The seclabel must be added to @vm prior calling domainGenSecurityLabel
              * which may require seclabel to be presented already */
@@ -553,7 +553,7 @@ int virSecurityManagerReserveLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -568,7 +568,7 @@ int virSecurityManagerReleaseLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -584,7 +584,7 @@ int virSecurityManagerSetAllLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -600,7 +600,7 @@ int virSecurityManagerRestoreAllLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -617,7 +617,7 @@ int virSecurityManagerGetProcessLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -632,7 +632,7 @@ int virSecurityManagerSetProcessLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -643,7 +643,7 @@ int virSecurityManagerSetChildProcessLabel(virSecurityManagerPtr mgr,
     if (mgr->drv->domainSetSecurityChildProcessLabel)
        return mgr->drv->domainSetSecurityChildProcessLabel(mgr, vm, cmd);
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -671,7 +671,7 @@ int virSecurityManagerVerify(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -687,7 +687,7 @@ int virSecurityManagerSetImageFDLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -703,7 +703,7 @@ int virSecurityManagerSetTapFDLabel(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 
@@ -718,7 +718,7 @@ char *virSecurityManagerGetMountOptions(virSecurityManagerPtr mgr,
         return ret;
     }
 
-    virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+    virReportUnsupportedError();
     return NULL;
 }
 

src/util/virerror.h

 /*
  * virerror.c: error handling and reporting code for libvirt
  *
- * Copyright (C) 2006-2013 Red Hat, Inc.
+ * Copyright (C) 2006-2014 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -156,6 +156,11 @@ void virReportSystemErrorFull(int domcode,
                       0, 0,                                          \
                       "%s", message);
 
+# define virReportUnsupportedError()                                    \
+    virReportErrorHelper(VIR_FROM_THIS, VIR_ERR_NO_SUPPORT,             \
+                         __FILE__, __FUNCTION__, __LINE__, __FUNCTION__)
+
+
 void virReportOOMErrorFull(int domcode,
                            const char *filename,
                            const char *funcname,

src/util/virinitctl.c

 /*
  * virinitctl.c: API for talking to init systems via initctl
  *
- * Copyright (C) 2012 Red Hat, Inc.
+ * Copyright (C) 2012-2014 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -168,7 +168,7 @@ cleanup:
 int virInitctlSetRunLevel(virInitctlRunLevel level ATTRIBUTE_UNUSED,
                           const char *vroot ATTRIBUTE_UNUSED)
 {
-   virReportError(VIR_ERR_NO_SUPPORT, "%s", __FUNCTION__);
+    virReportUnsupportedError();
     return -1;
 }
 #endif

src/xen/xen_driver.c

 /*
  * xen_driver.c: Unified Xen driver.
  *
- * Copyright (C) 2007-2013 Red Hat, Inc.
+ * Copyright (C) 2007-2014 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -2320,7 +2320,7 @@ xenUnifiedConnectDomainEventRegister(virConnectPtr conn,
     xenUnifiedLock(priv);
 
     if (priv->xsWatch == -1) {
-        virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+        virReportUnsupportedError();
         xenUnifiedUnlock(priv);
         return -1;
     }
@@ -2346,7 +2346,7 @@ xenUnifiedConnectDomainEventDeregister(virConnectPtr conn,
     xenUnifiedLock(priv);
 
     if (priv->xsWatch == -1) {
-        virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+        virReportUnsupportedError();
         xenUnifiedUnlock(priv);
         return -1;
     }
@@ -2377,7 +2377,7 @@ xenUnifiedConnectDomainEventRegisterAny(virConnectPtr conn,
     xenUnifiedLock(priv);
 
     if (priv->xsWatch == -1) {
-        virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+        virReportUnsupportedError();
         xenUnifiedUnlock(priv);
         return -1;
     }
@@ -2404,7 +2404,7 @@ xenUnifiedConnectDomainEventDeregisterAny(virConnectPtr conn,
     xenUnifiedLock(priv);
 
     if (priv->xsWatch == -1) {
-        virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+        virReportUnsupportedError();
         xenUnifiedUnlock(priv);
         return -1;
     }