[libvirt] [PATCH v2 3/5] Network: Move dnsmasqContext creation to networkSaveDnsmasqHostsfile() and pass to dnsmasq only if applicable

[Michal Novotny]

Make: passed
Make check: passed
Make syntax-check: passed

Hi,
this is the patch to move the dnsmasqContext creation to the
networkSaveDnsmasqHostsfile() function and also it passes the
hosts-file and addn-hosts to the file only if applicable, i.e.
if it's already set.

Originally I wanted to call the DhcpHostsfile and AddnHostsfile
creation on the first call to dnsmasqAddDhcpHost/dnsmasqAddHost
however that way I would have kept track of the path name to
be generated which would require storing network name and config
directory somewhere in the structure and that's why I changed
it to simple approach used in this patch.

Michal

Signed-off-by: Michal Novotny <minovotn at redhat.com>
---
 src/network/bridge_driver.c |   38 +++++++++++++++++++++-----------------
 1 files changed, 21 insertions(+), 17 deletions(-)

diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index b6ce39d..41b14f9 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -420,13 +420,20 @@ networkShutdown(void) {
 }
 
 
-static int
+static dnsmasqContext*
 networkSaveDnsmasqHostsfile(virNetworkIpDefPtr ipdef,
-                            dnsmasqContext *dctx,
+                            char *name,
                             bool force)
 {
     unsigned int i;
 
+    dnsmasqContext *dctx = dnsmasqContextNew(name,
+                                             DNSMASQ_STATE_DIR);
+    if (dctx == NULL) {
+        virReportOOMError();
+        goto cleanup;
+    }
+
     if (! force && virFileExists(dctx->hostsfile->path))
         return 0;
 
@@ -437,9 +444,14 @@ networkSaveDnsmasqHostsfile(virNetworkIpDefPtr ipdef,
     }
 
     if (dnsmasqSave(dctx) < 0)
-        return -1;
+        goto cleanup;
 
-    return 0;
+    return dctx;
+
+cleanup:
+    dnsmasqContextFree(dctx);
+
+    return NULL;
 }
 
 static int
@@ -451,6 +463,7 @@ networkBuildDnsmasqArgv(virNetworkObjPtr network,
     int nbleases = 0;
     int ii;
     virNetworkIpDefPtr tmpipdef;
+    dnsmasqContext *dctx = NULL;
 
     /*
      * NB, be careful about syntax for dnsmasq options in long format.
@@ -572,18 +585,11 @@ networkBuildDnsmasqArgv(virNetworkObjPtr network,
         if (ipdef->nranges || ipdef->nhosts)
             virCommandAddArg(cmd, "--dhcp-no-override");
 
-        if (ipdef->nhosts > 0) {
-            dnsmasqContext *dctx = dnsmasqContextNew(network->def->name,
-                                                     DNSMASQ_STATE_DIR);
-            if (dctx == NULL) {
-                virReportOOMError();
-                goto cleanup;
-            }
-
-            if (networkSaveDnsmasqHostsfile(ipdef, dctx, false) == 0) {
+        if ((dctx = networkSaveDnsmasqHostsfile(ipdef, network->def->name, false))) {
+            if (dctx->hostsfile->nhosts)
                 virCommandAddArgPair(cmd, "--dhcp-hostsfile",
                                      dctx->hostsfile->path);
-            }
+
             dnsmasqContextFree(dctx);
         }
 
@@ -2203,11 +2209,9 @@ static virNetworkPtr networkDefine(virConnectPtr conn, const char *xml) {
         }
     }
     if (ipv4def) {
-        dnsmasqContext *dctx = dnsmasqContextNew(network->def->name, DNSMASQ_STATE_DIR);
+        dnsmasqContext* dctx = networkSaveDnsmasqHostsfile(ipv4def, network->def->name, true);
         if (dctx == NULL)
             goto cleanup;
-
-        networkSaveDnsmasqHostsfile(ipv4def, dctx, true);
         dnsmasqContextFree(dctx);
     }
 
-- 
1.7.3.2