[2/7] mesos git commit: Minor refactor for MesosContainerizer.

[nnielsen]

Minor refactor for MesosContainerizer.

This change moves two different pieces of code, that each iterate over
list of ContainerPrepareInfos, close together for readability. It
becomes even more relevant when looking at
https://reviews.apache.org/r/38365/ that iterates over yet another
member from ContainerPrepareInfo.

Review: https://reviews.apache.org/r/38364


Project: http://git-wip-us.apache.org/repos/asf/mesos/repo
Commit: http://git-wip-us.apache.org/repos/asf/mesos/commit/fc541a9a
Tree: http://git-wip-us.apache.org/repos/asf/mesos/tree/fc541a9a
Diff: http://git-wip-us.apache.org/repos/asf/mesos/diff/fc541a9a

Branch: refs/heads/master
Commit: fc541a9a97eb1d86c27452019ff217eed11ed5a3
Parents: e047f7d
Author: Kapil Arya <ka...@mesosphere.io>
Authored: Wed Sep 16 17:00:55 2015 -0700
Committer: Niklas Q. Nielsen <n...@qni.dk>
Committed: Wed Sep 16 17:00:55 2015 -0700

----------------------------------------------------------------------
 src/slave/containerizer/mesos/containerizer.cpp | 38 ++++++++++----------
 1 file changed, 19 insertions(+), 19 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/mesos/blob/fc541a9a/src/slave/containerizer/mesos/containerizer.cpp
----------------------------------------------------------------------
diff --git a/src/slave/containerizer/mesos/containerizer.cpp 
b/src/slave/containerizer/mesos/containerizer.cpp
index 71f16cc..3f0d8fb 100644
--- a/src/slave/containerizer/mesos/containerizer.cpp
+++ b/src/slave/containerizer/mesos/containerizer.cpp
@@ -786,17 +786,31 @@ Future<bool> MesosContainerizerProcess::_launch(
     environment[variable.name()] = variable.value();
   }
 
-  // Include any environment variables returned from
-  // Isolator::prepare().
+  JSON::Array commandArray;
   foreach (const Option<ContainerPrepareInfo>& prepareInfo, prepareInfos) {
-    if (prepareInfo.isSome() && prepareInfo.get().has_environment()) {
+    if (!prepareInfo.isSome()) {
+      continue;
+    }
+
+    // Populate the list of additional commands to be run inside the container
+    // context.
+    foreach (const CommandInfo& command, prepareInfo.get().commands()) {
+      commandArray.values.push_back(JSON::Protobuf(command));
+    }
+
+    // Process additional environment variables returned by isolators.
+    if (prepareInfo.get().has_environment()) {
       foreach (const Environment::Variable& variable,
-               prepareInfo.get().environment().variables()) {
+          prepareInfo.get().environment().variables()) {
         environment[variable.name()] = variable.value();
       }
     }
   }
 
+  // TODO(jieyu): Use JSON::Array once we have generic parse support.
+  JSON::Object commands;
+  commands.values["commands"] = commandArray;
+
   // Use a pipe to block the child until it's been isolated.
   int pipes[2];
 
@@ -814,21 +828,7 @@ Future<bool> MesosContainerizerProcess::_launch(
   launchFlags.user = user;
   launchFlags.pipe_read = pipes[0];
   launchFlags.pipe_write = pipes[1];
-
-  // Prepare the additional prepareInfo commands.
-  // TODO(jieyu): Use JSON::Array once we have generic parse support.
-  JSON::Object object;
-  JSON::Array array;
-  foreach (const Option<ContainerPrepareInfo>& prepareInfo, prepareInfos) {
-    if (prepareInfo.isSome()) {
-      foreach (const CommandInfo& command, prepareInfo.get().commands()) {
-        array.values.push_back(JSON::Protobuf(command));
-      }
-    }
-  }
-  object.values["commands"] = array;
-
-  launchFlags.commands = object;
+  launchFlags.commands = commands;
 
   // TODO(karya): Create ContainerPrepareInfo.namespaces and use that instead 
of
   // Isolator::namespaces().