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[libvirt] [PATCHv2] qemu: Clean up security driver initialisation and config file



Commit d0c0e79ac646462aaa815f81ad324a0d3ef12954 left behind some dead
code (hasDAC can't be efectively set to true, because
virSecurityManagerNew fails to load the "dac" driver).

This patch also enhances the condition for adding the default
auto-detected security manager if the manager array is allocated but
empty.

Also the configuration file for qemu driver still contains reference to
the DAC driver that can't be enabled manualy.
---
 src/qemu/qemu.conf     | 4 +++-
 src/qemu/qemu_driver.c | 9 +++------
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/src/qemu/qemu.conf b/src/qemu/qemu.conf
index fb22b7c..d3175fa 100644
--- a/src/qemu/qemu.conf
+++ b/src/qemu/qemu.conf
@@ -162,7 +162,9 @@
 # driver at the same time, for this use a list of names separated by
 # comma and delimited by square brackets. For example:
 #
-#       security_driver = [ "selinux", "dac" ]
+#       security_driver = [ "selinux", "apparmor" ]
+#
+# Note: The DAC security driver is always enabled.
 #
 #security_driver = "selinux"

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 5d9f8c9..7c0a5c3 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -251,14 +251,11 @@ qemuSecurityInit(struct qemud_driver *driver)
     char **names;
     virSecurityManagerPtr mgr = NULL;
     virSecurityManagerPtr stack = NULL;
-    bool hasDAC = false;

-    if (driver->securityDriverNames) {
+    if (driver->securityDriverNames &&
+        driver->securityDriverNames[0]) {
         names = driver->securityDriverNames;
         while (names && *names) {
-            if (STREQ("dac", *names))
-                hasDAC = true;
-
             if (!(mgr = virSecurityManagerNew(*names,
                                               QEMU_DRIVER_NAME,
                                               driver->allowDiskFormatProbing,
@@ -287,7 +284,7 @@ qemuSecurityInit(struct qemud_driver *driver)
         mgr = NULL;
     }

-    if (!hasDAC && driver->privileged) {
+    if (driver->privileged) {
         if (!(mgr = virSecurityManagerNewDAC(QEMU_DRIVER_NAME,
                                              driver->user,
                                              driver->group,
-- 
1.7.12


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