Some cleanups before merge.

* removed the 'CLOUD-INIT-IGNORE' section, as we're just blindly writing
  the file now. removed the now-unnecessary import of 're' and 'os'
* removed try/except block around write_apt_snippet.  This will bubble
  up and cloud-init will let it through even to the console.  Catching
  it and turning it into a debug would just hide it.
* removed 'default' as a synonym for 'whatever cloud-init thinks is best'
  If people are going to change this, I'd rather they be specific.
* supported value of "0"
* fixed some complaints from 
   ./tools/run-pylint cloudinit/CloudConfig/cc_apt_pipelining.py

1 files changed, 12 insertions, 29 deletions

diff --git a/cloudinit/CloudConfig/cc_apt_pipelining.py b/cloudinit/CloudConfig/cc_apt_pipelining.py
index c1e65847..7ca93e66 100644
--- a/cloudinit/CloudConfig/cc_apt_pipelining.py
+++ b/cloudinit/CloudConfig/cc_apt_pipelining.py
@@ -17,54 +17,37 @@
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import cloudinit.util as util
-import re
-import os
 from cloudinit.CloudConfig import per_instance
 
 frequency = per_instance
 default_file = "/etc/apt/apt.conf.d/90cloud-init-pipeling"
 
-def handle(_name, cfg, cloud, log, _args):
+
+def handle(_name, cfg, _cloud, log, _args):
 
     apt_pipe_value = util.get_cfg_option_str(cfg, "apt_pipelining", False)
     apt_pipe_value = str(apt_pipe_value).lower()
 
-    if apt_pipe_value in ("false", "default", False):
-        write_apt_snippet(0, log)
+    if apt_pipe_value == "false":
+        write_apt_snippet("0", log)
 
     elif apt_pipe_value in ("none", "unchanged", "os"):
         return
 
-    elif apt_pipe_value in str(range(1, 5)):
+    elif apt_pipe_value in str(range(0, 6)):
         write_apt_snippet(apt_pipe_value, log)
 
     else:
-        log.warn("Invalid option for apt_pipeling")
+        log.warn("Invalid option for apt_pipeling: %s" % apt_pipe_value)
+
 
 def write_apt_snippet(setting, log, f_name=default_file):
-    """
-        Reads f_name and determines if the setting matches or not. Sets to
-        desired value
-    """
+    """ Writes f_name with apt pipeline depth 'setting' """
 
     acquire_pipeline_depth = 'Acquire::http::Pipeline-Depth "%s";\n'
-    try:
-        if os.path.exists(f_name):
-            skip_re = re.compile('^//CLOUD-INIT-IGNORE.*')
-
-            for line in tweak.readlines():
-                if skip_re.match(line):
-                    tweak.close()
-                    return
-
-            tweak.close()
-
-        file_contents = ("//Cloud-init Tweaks\n//Disables APT HTTP pipelining"\
-                        "\n" + (acquire_pipeline_depth % setting))
-
-        util.write_file(f_name, file_contents)
+    file_contents = ("//Written by cloud-init per 'apt_pipelining'\n"
+                     + (acquire_pipeline_depth % setting))
 
-        log.debug("Wrote %s with APT pipeline setting" % f_name )
+    util.write_file(f_name, file_contents)
 
-    except IOError as e:
-        log.debug("Unable to update pipeline settings in %s\n%s" % (f_name, e))
+    log.debug("Wrote %s with APT pipeline setting" % f_name)