bitbake: bitbake-worker: Add/support network task flag

This patch changes behaviour. After this change any task which does not
have the network flag set will have networking disabled on systems that
support that (kernel version dependent).

Add a "network" task specific flag which then triggers networking to
be enabled for this task, it is otherwise disabled.

This needs to happen before we enter the fakeroot environment of the task
due to the need for the real uid/gid which we save in the parent process.

(Bitbake rev: 0746b6a2a32fec4c18bf1a52b1454ca4c04bf543)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/bin/bitbake-worker

@@ -152,6 +152,10 @@ def fork_off_task(cfg, data, databuilder, workerdata, fn, task, taskname, taskha
     fakeenv = {}
     umask = None
 
+    uid = os.getuid()
+    gid = os.getgid()
+
+
     taskdep = workerdata["taskdeps"][fn]
     if 'umask' in taskdep and taskname in taskdep['umask']:
         umask = taskdep['umask'][taskname]
@@ -257,6 +261,10 @@ def fork_off_task(cfg, data, databuilder, workerdata, fn, task, taskname, taskha
 
                 bb.utils.set_process_name("%s:%s" % (the_data.getVar("PN"), taskname.replace("do_", "")))
 
+                if not the_data.getVarFlag(taskname, 'network', False):
+                    logger.debug("Attempting to disable network")
+                    bb.utils.disable_network(uid, gid)
+
                 # exported_vars() returns a generator which *cannot* be passed to os.environ.update() 
                 # successfully. We also need to unset anything from the environment which shouldn't be there 
                 exports = bb.data.exported_vars(the_data)