Switch back to strict confinement

The following are included in the switch to strict confinement:
* Set snapcraft.yaml confinement to strict and restore/update plugs
* Drop building of python as it's not required for strict snaps
* Switch back to running apps under root

Change-Id: I2a985ecea36c82f9b08f145015219911e0ec0616

README.md

@@ -10,7 +10,7 @@ snap based OpenStack deployment.
 
 The neutron snap can be installed directly from the snap store:
 
-    sudo snap install --edge --classic neutron
+    sudo snap install --edge neutron
 
 The neutron snap is working towards publication across tracks for
 OpenStack releases. The edge channel for each track will contain the tip
@@ -20,8 +20,8 @@ will be published progressively to beta, then candidate, and then stable once
 CI validation completes for the channel. This should result in an experience
 such as:
 
-    sudo snap install --classic --channel=ocata/stable neutron
-    sudo snap install --classic --channel=pike/edge neutron
+    sudo snap install --channel=ocata/stable neutron
+    sudo snap install --channel=pike/edge neutron
 
 ## Configuring neutron
 
@@ -71,11 +71,6 @@ The services for the neutron snap will log to its $SNAP_COMMON writable area:
 
 ## Managing neutron
 
-The neutron snap will drop privileges to run daemons and commands under
-a regular user named snap-neutron. Additionally, permissions and ownership
-of files and directories in /var/snap/neutron/common/ are modified to
-restrict access from other users.
-
 The neutron snap has alias support that enables use of the well-known
 neutron-db-manage command. To enable the alias, run the following prior to
 using the command:

snap/snap-openstack.yaml

@@ -1,10 +1,5 @@
 setup:
-  users:
-    snap-neutron: [snap-neutron]
-  default-owner: "root:snap-neutron"
   dirs:
-    - "{snap_common}/etc"
-    - "{snap_common}/etc/neutron"
     - "{snap_common}/etc/neutron/neutron.conf.d"
     - "{snap_common}/etc/neutron/plugins/ml2"
     - "{snap_common}/etc/neutron/policy.d"
@@ -14,10 +9,6 @@ setup:
     - "{snap_common}/lock"
   templates:
     neutron-snap.conf.j2: "{snap_common}/etc/neutron/neutron.conf.d/neutron-snap.conf"
-  rchown:
-    "{snap_common}/lock": "snap-neutron:snap-neutron"
-    "{snap_common}/log": "snap-neutron:snap-neutron"
-    "{snap_common}/lib": "snap-neutron:snap-neutron"
 entry_points:
   neutron-db-manage:
     binary: "{snap}/bin/neutron-db-manage"
@@ -29,8 +20,6 @@ entry_points:
       - "{snap_common}/etc/neutron/plugins/ml2/ml2_conf.ini"
     config-dirs:
       - "{snap_common}/etc/neutron/neutron.conf.d"
-    run-as:
-      snap-neutron: [snap-neutron]
   neutron-server:
     binary: "{snap}/bin/neutron-server"
     config-files:
@@ -42,5 +31,3 @@ entry_points:
     config-dirs:
       - "{snap_common}/etc/neutron/neutron.conf.d"
     log-file: "{snap_common}/log/neutron-server.log"
-    run-as:
-      snap-neutron: [snap-neutron]

snapcraft.yaml

@@ -2,25 +2,24 @@ name: neutron
 version: ocata
 summary: OpenStack Network Service (neutron)
 description: OpenStack Network Service (neutron)
-confinement: classic
+confinement: strict
 grade: devel
 
 apps:
   api:
-    command: >
-      env PYTHONPATH=$PYTHONPATH:$SNAP/lib/python2.7/site-packages
-      $SNAP/usr/bin/python2 $SNAP/bin/snap-openstack neutron-server
+    command: snap-openstack neutron-server
     daemon: simple
+    plugs:
+      - network-bind
   manage:
-    command: >
-      env PYTHONPATH=$PYTHONPATH:$SNAP/lib/python2.7/site-packages
-      $SNAP/usr/bin/python2 $SNAP/bin/snap-openstack neutron-db-manage
+    command: snap-openstack neutron-db-manage
     aliases:
       - neutron-db-manage
+    plugs:
+      - network
 
 parts:
   neutron:
-    after: [python]
     plugin: python
     python-version: python2
     source: http://tarballs.openstack.org/neutron/neutron-stable-ocata.tar.gz
@@ -33,11 +32,6 @@ parts:
       - gcc
       - libffi-dev
       - libssl-dev
-    stage:
-      - -usr/bin/2to3
-      - -usr/bin/pydoc
-      - -usr/bin/python2.7
-      - -usr/lib/python2.7
     install: |
       touch $SNAPCRAFT_PART_INSTALL/lib/python2.7/site-packages/paste/__init__.py
       touch $SNAPCRAFT_PART_INSTALL/lib/python2.7/site-packages/repoze/__init__.py
@@ -62,16 +56,3 @@ parts:
         - etc/neutron/*
     stage: [$etc]
     prime: [$etc]
-  python:
-    source: https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tar.xz
-    plugin: autotools
-    configflags:
-      - --prefix=/usr
-      - --enable-shared
-      - --enable-unicode=ucs4
-    build-packages:
-      - libssl-dev
-    prime:
-      - -usr/include
-    install:
-      $SNAPCRAFT_PART_INSTALL/usr/bin/python2 -m ensurepip