qemu: Fix the command line generation for rbd auth using aes secrets

https://bugzilla.redhat.com/show_bug.cgi?id=1182074

Since libvirt still uses a legacy qemu arg format to add a disk, the
manner in which the 'password-secret' argument is passed to qemu needs
to change to prepend a 'file.' If in the future, usage of the more
modern disk format, then the prepended 'file.' can be removed.

Fix based on Jim Fehlig <jfehlig@suse.com> posting and subsequent
upstream list followups, see:

http://www.redhat.com/archives/libvir-list/2016-August/msg00777.html

for details. Introduced by commit id 'a1344f70'.

src/qemu/qemu_command.c

@@ -1287,7 +1287,12 @@ qemuBuildDriveSourceStr(virDomainDiskDefPtr disk,
     virBufferAddLit(buf, ",");
 
     if (secinfo && secinfo->type == VIR_DOMAIN_SECRET_INFO_TYPE_AES) {
-        virBufferAsprintf(buf, "password-secret=%s,",
+        /* NB: If libvirt starts using the more modern option based
+         *     syntax to build the command line (e.g., "-drive driver=rbd,
+         *     filename=%s,...") instead of the legacy model (e.g."-drive
+         *     file=%s,..."), then the "file." prefix can be removed
+         */
+        virBufferAsprintf(buf, "file.password-secret=%s,",
                           secinfo->s.aes.alias);
     }
 

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-auth-AES.args

@@ -26,7 +26,7 @@ data=9eao5F8qtkGt+seB1HYivWIxbtwUu6MQtg1zpj/oDtUsPr1q8wBYM91uEHCn6j/1,\
 keyid=masterKey0,iv=AAECAwQFBgcICQoLDA0ODw==,format=base64 \
 -drive 'file=rbd:pool/image:id=myname:auth_supported=cephx\;none:\
 mon_host=mon1.example.org\:6321\;mon2.example.org\:6322\;mon3.example.org\:\
-6322,password-secret=virtio-disk0-secret0,format=raw,if=none,\
+6322,file.password-secret=virtio-disk0-secret0,format=raw,if=none,\
 id=drive-virtio-disk0' \
 -device virtio-blk-pci,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,\
 id=virtio-disk0