[libvirt] [PATCH] [LXC] Add version implementation

[Dan Smith]

This patch adds an implementation of the version function to the LXC driver.
The providers use the hypervisor version in a field of one of the instances,
so we need to have something meaningful here.  AFAICT, the only real option
we have (considering the limitations of the libvirt version information) is
to use the kernel version.

diff -r be3be31c94a2 -r 0cabead40d65 src/lxc_driver.c
--- a/src/lxc_driver.c	Fri Aug 29 07:11:15 2008 +0000
+++ b/src/lxc_driver.c	Fri Aug 29 09:10:41 2008 -0700
@@ -1110,6 +1110,29 @@
     return 0;
 }
 
+static int lxcVersion(virConnectPtr conn, unsigned long *version)
+{
+    struct utsname ver;
+    int maj;
+    int min;
+    int rev;
+
+    if (uname(&ver) != 0) {
+        lxcError(conn, NULL, VIR_ERR_INTERNAL_ERROR,
+                 _("uname(): %m"));
+        return -1;
+    }
+
+    if (sscanf(ver.release, "%i.%i.%i", &maj, &min, &rev) != 3) {
+        lxcError(conn, NULL, VIR_ERR_INTERNAL_ERROR,
+                 _("Unknown release: %s"), ver.release);
+        return -1;
+    }
+
+    *version = (maj * 1000 * 1000) + (min * 1000) + rev;
+
+    return 0;
+}
 
 /* Function Tables */
 static virDriver lxcDriver = {
@@ -1121,7 +1144,7 @@
     lxcClose, /* close */
     NULL, /* supports_feature */
     NULL, /* type */
-    NULL, /* version */
+    lxcVersion, /* version */
     NULL, /* getHostname */
     NULL, /* getURI */
     NULL, /* getMaxVcpus */