Azure VM Preprovisioning support.

This change will enable azure vms to report provisioning has completed
twice, first to tell the fabric it has completed then a second time to
enable customer settings. The datasource for the second provisioning is
the Instance Metadata Service (IMDS),and the VM will poll indefinitely for
the new ovf-env.xml from IMDS.

This branch introduces EphemeralDHCPv4 which encapsulates common logic
used by both DataSourceEc2 an DataSourceAzure for temporary DHCP
interactions without side-effects.

LP: #1734991

1 files changed, 8 insertions, 3 deletions

diff --git a/cloudinit/temp_utils.py b/cloudinit/temp_utils.py
index 5d7adf70..c98a1b53 100644
--- a/cloudinit/temp_utils.py
+++ b/cloudinit/temp_utils.py
@@ -28,13 +28,18 @@ def _tempfile_dir_arg(odir=None, needs_exe=False):
     if odir is not None:
         return odir
 
+    if needs_exe:
+        tdir = _EXE_ROOT_TMPDIR
+        if not os.path.isdir(tdir):
+            os.makedirs(tdir)
+            os.chmod(tdir, 0o1777)
+        return tdir
+
     global _TMPDIR
     if _TMPDIR:
         return _TMPDIR
 
-    if needs_exe:
-        tdir = _EXE_ROOT_TMPDIR
-    elif os.getuid() == 0:
+    if os.getuid() == 0:
         tdir = _ROOT_TMPDIR
     else:
         tdir = os.environ.get('TMPDIR', '/tmp')