Complete initial cleanup for refactoring/rework.

Some of the cleanups were the following

1. Using standard (logged) utility functions for sub process work, writing, reading files, and other file system/operating system options
2. Having distrobutions impelement there own subclasses to handle system specifics (if applicable)
3. Having a cloud wrapper that provides just the functionality we want to expose (cloud.py)
4. Using a path class instead of globals for all cloud init paths (it is configured via config)
5. Removal of as much shared global state as possible (there should be none, minus a set of constants)
6. Other various cleanups that remove transforms/handlers/modules from reading/writing/chmoding there own files. 
 a. They should be using util functions to take advantage of the logging that is now enabled in those util functions (very useful for debugging)
7. Urls being read and checked from a single module that serves this and only this purpose (+1 for code organization)
8. Updates to log whenever a transform decides not to run
9. Ensure whenever a exception is thrown (and possibly captured) that the util.logexc function is called 
 a. For debugging, tracing this is important to not just drop them on the floor.
10. Code shuffling into utils.py where it makes sense (and where it could serve a benefit for other code now or in the future)

1 files changed, 27 insertions, 23 deletions

diff --git a/cloudinit/transforms/cc_bootcmd.py b/cloudinit/transforms/cc_bootcmd.py
index f584da02..a2efad32 100644
--- a/cloudinit/transforms/cc_bootcmd.py
+++ b/cloudinit/transforms/cc_bootcmd.py
@@ -17,32 +17,36 @@
 #
 #    You should have received a copy of the GNU General Public License
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-import cloudinit.util as util
-import subprocess
-import tempfile
+
 import os
-from cloudinit.CloudConfig import per_always
-frequency = per_always
+import tempfile
+
+from cloudinit import util
+from cloudinit.settings import PER_ALWAYS
 
+frequency = PER_ALWAYS
+
+
+def handle(name, cfg, cloud, log, _args):
 
-def handle(_name, cfg, cloud, log, _args):
     if "bootcmd" not in cfg:
+        log.debug("Skipping module named %s,  no 'bootcomd' key in configuration", name)
         return
 
-    try:
-        content = util.shellify(cfg["bootcmd"])
-        tmpf = tempfile.TemporaryFile()
-        tmpf.write(content)
-        tmpf.seek(0)
-    except:
-        log.warn("failed to shellify bootcmd")
-        raise
-
-    try:
-        env = os.environ.copy()
-        env['INSTANCE_ID'] = cloud.get_instance_id()
-        subprocess.check_call(['/bin/sh'], env=env, stdin=tmpf)
-        tmpf.close()
-    except:
-        log.warn("failed to run commands from bootcmd")
-        raise
+    with tempfile.NamedTemporaryFile(suffix=".sh") as tmpf:
+        try:
+            content = util.shellify(cfg["bootcmd"])
+            tmpf.write(content)
+            tmpf.flush()
+        except:
+            log.warn("Failed to shellify bootcmd")
+            raise
+
+        try:
+            env = os.environ.copy()
+            env['INSTANCE_ID'] = cloud.get_instance_id()
+            cmd = ['/bin/sh', tmpf.name]
+            util.subp(cmd, env=env, capture=False)
+        except:
+            log.warn("Failed to run commands from bootcmd")
+            raise