[libvirt] [PATCH 1/2] util: Fix VIR_ERR_ACCESS_DENIED formatting

[John Ferlan]

In commit ccc72d5cb I thought I had the brilliant idea that I
could alter an error message in virErrorMsg to take two arguments
"drivername" and NULL. Then passing the failed drivername for
VIR_ERR_ACCESS_DENIED users would magically allow any "real"
error message to be included.  Of course it worked for the
majority of errors, except for 1 teeny, tiny, problem - there
was a caller using VIR_ERR_ACCESS_DENIED that actually passed
"real" error message - virAccessDriverPolkitGetCaller, but
didn't pass a driver name.  So when this code went to call
virErrorMsg it resulted in garbage being printed in that
second argument because that's not how things are written.

So in order to avoid that issue, reset the error back to the
usual if info == NULL, the print just some text; otherwise,
print a formatted output. For a majority of error messages
this will print the driver name after "access deined from:".
For the one case in question, the correct error message will
be displayed and no garbage chars.

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/util/virerror.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/util/virerror.c b/src/util/virerror.c
index 10f1b55c5f..df239bf371 100644
--- a/src/util/virerror.c
+++ b/src/util/virerror.c
@@ -1442,9 +1442,9 @@ virErrorMsg(virErrorNumber error, const char *info)
             break;
         case VIR_ERR_ACCESS_DENIED:
             if (info == NULL)
-                errmsg = _("access denied from '%s'");
+                errmsg = _("access denied");
             else
-                errmsg = _("access denied from '%s': %s");
+                errmsg = _("access denied from: %s");
             break;
         case VIR_ERR_DBUS_SERVICE:
             if (info == NULL)
-- 
2.17.2