Compile nginx from source

Compile nginx from source and cleanup nginx.conf template.

Change-Id: I0adce7bdfb673853952cb58734fc2c35f9724e04

snap/snap-openstack.yaml

@@ -7,10 +7,6 @@ setup:
     - "{snap_common}/log"
     - "{snap_common}/lock"
     - "{snap_common}/run"
-    # NOTE(coreycb): Drop /var/*/nginx dirs once nginx is compiled from source.
-    # nginx hardcodes paths at compile time without override capability.
-    - "/var/lib/nginx"
-    - "/var/log/nginx"
   templates:
     nova-snap.conf.j2: "{snap_common}/etc/nova/conf.d/nova-snap.conf"
     nova-placement-api.ini.j2: "{snap_common}/etc/uwsgi/nova-placement-api.ini"
@@ -18,7 +14,7 @@ setup:
     nginx.conf.j2: "{snap_common}/etc/nginx/nginx.conf"
   copyfiles:
     "{snap}/etc/nova": "{snap_common}/etc/nova"
-    "{snap}/etc/nginx": "{snap_common}/etc/nginx"
+    "{snap}/usr/conf": "{snap_common}/etc/nginx"
 entry_points:
   nova-api-os-compute:
     binary: "{snap}/bin/nova-api-os-compute"

snap/templates/nginx.conf.j2

@@ -1,14 +1,12 @@
 user root;
 worker_processes auto;
 pid {{ snap_common }}/run/nginx.pid;
-include {{ snap_common }}/etc/nginx/modules-enabled/*.conf;
 
 events {
         worker_connections 768;
 }
 
 http {
-
         ##
         # Basic Settings
         ##
@@ -22,13 +20,6 @@ http {
         include {{ snap_common }}/etc/nginx/mime.types;
         default_type application/octet-stream;
 
-        ##
-        # SSL Settings
-        ##
-
-        ssl_protocols TLSv1.1 TLSv1.2;
-        ssl_prefer_server_ciphers on;
-
         ##
         # Logging Settings
         ##

snapcraft.yaml

@@ -74,7 +74,6 @@ parts:
       - libssl-dev
       - libxml2-dev
       - libxslt1-dev
-    stage-packages: [nginx]
     stage:
       - -usr/bin/2to3
       - -usr/bin/pydoc
@@ -99,6 +98,18 @@ parts:
         - etc/nova/rootwrap.d
     stage: [$etc]
     snap: [$etc]
+  nginx:
+    source: http://www.nginx.org/download/nginx-1.13.0.tar.gz
+    plugin: autotools
+    configflags:
+      - --prefix=/usr
+      - --http-log-path=/var/snap/nova/common/log/nginx-access.log
+      - --error-log-path=/var/snap/nova/common/log/nginx-error.log
+      - --lock-path=/var/snap/nova/common/lock/nginx.lock
+      - --pid-path=/var/snap/nova/common/run/nginx.pid
+    build-packages:
+      - libpcre3-dev
+      - libssl-dev
   python:
     source: https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tar.xz
     plugin: autotools