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[libvirt] Pass additional environmental variables



We're using sasl+gssapi+kerberos to do authentication for libvirt, including from hypervisor to hypervisor.  However, the environmental variable filtering implemented in libvirt prevents this from working, so we're forced to run a locally patched version.

Thoughts on the following patch to pass the location of the local credential cache as well?

--- a/src/util/vircommand.c    2014-01-07 14:14:11.388934108 +0000
+++ b/src/util/vircommand.c    2014-01-07 14:18:14.725082505 +0000
@@ -1314,6 +1314,7 @@
 
     virCommandAddEnvPair(cmd, "LC_ALL", "C");
 
+    virCommandAddEnvPassBlockSUID(cmd, "KRB5CCNAME", NULL);
     virCommandAddEnvPassBlockSUID(cmd, "LD_PRELOAD", NULL);
     virCommandAddEnvPassBlockSUID(cmd, "LD_LIBRARY_PATH", NULL);
     virCommandAddEnvPassBlockSUID(cmd, "PATH", "/bin:/usr/bin");


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