Used shared init with LinuxKit

With https://github.com/linuxkit/linuxkit/pull/2500 the init script
can be used for both bare metal and in Docker.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

examples/docker.yml

@@ -1,8 +0,0 @@
-init:
-  - mobytest/init-container:132e5ee824d41c70ade5fa10071f32170cb9561e
-  - linuxkit/runc:dfc0437161843bc0dfeb334cda7ffd6a18b76bcd
-  - linuxkit/containerd:d136569c66ce041853d762b7032456419e580efe
-  - linuxkit/ca-certificates:e44b0a66df5a102c0e220f0066b0d904710dcb10
-trust:
-  org:
-    - linuxkit

examples/linuxkit.yml

@@ -1,16 +1,15 @@
 kernel:
   image: "linuxkit/kernel:4.9.41"
   cmdline: "console=ttyS0"
-init:
-  - linuxkit/init:c7d651da1a5e308c757bc61ce6a41804ea843426
-  - linuxkit/runc:dfc0437161843bc0dfeb334cda7ffd6a18b76bcd
-  - linuxkit/containerd:d136569c66ce041853d762b7032456419e580efe
-  - linuxkit/ca-certificates:e44b0a66df5a102c0e220f0066b0d904710dcb10
 onboot:
   - name: dhcpcd
     image: "linuxkit/dhcpcd:f3f5413abb78fae9020e35bd4788fa93df4530b7"
     command: ["/sbin/dhcpcd", "--nobackground", "-f", "/dhcpcd.conf", "-1"]
 services:
+  - name: getty
+    image: linuxkit/getty:797cb79e0a229fcd16ebf44a0da74bcec03968ec
+    env:
+     - INSECURE=true
   - name: rngd
     image: "linuxkit/rngd:558e86a36242bb74353bc9287b715ddb8567357e"
 trust:

examples/nginx.yml

@@ -1,3 +1,8 @@
+init:
+  - linuxkit/init:6fe9d31a53bbd200183bb31edd795305e868d5a7
+  - linuxkit/runc:a1b564248a0d0b118c11e61db9f84ecf41dd2d2a
+  - linuxkit/containerd:06876ceef325e49e9ba119659357768d5df89075
+  - linuxkit/ca-certificates:e44b0a66df5a102c0e220f0066b0d904710dcb10
 services:
   - name: nginx
     image: "nginx:alpine"
@@ -10,3 +15,4 @@ services:
 trust:
   org:
     - library
+    - linuxkit

src/moby/build.go

@@ -36,7 +36,7 @@ FROM scratch
 
 COPY . ./
 
-ENTRYPOINT ["/sbin/tini", "--", "/bin/rc.init"]
+ENTRYPOINT ["/bin/rc.init"]
 `
 
 // For now this is a constant that we use in init section only to make