Move onboot startup script to runc package

As this does not use containerd at all, this means you can run very
minimal setups with just `runc` if you use no services, for example
most of our tests do not actually use services, or if you have other
similar very minimal use cases.

Move ulimit setup to `init` which makes more sense.

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

pkg/containerd/Makefile

@@ -1,5 +1,5 @@
 IMAGE=containerd
 NETWORK=1
-DEPS=$(wildcard etc/init.d/*)
+DEPS=$(wildcard etc/init.d/*) etc/containerd/config.toml
 
 include ../package.mk

pkg/containerd/etc/init.d/020-containerd

@@ -1,9 +1,5 @@
 #!/bin/sh
 
-# set global ulimits TODO move to /etc/limits.conf
-ulimit -n 1048576
-ulimit -p unlimited
-
 # bring up containerd
 printf "\nStarting containerd\n"
 /usr/bin/containerd &
@@ -14,20 +10,6 @@ do
 	sleep 0.1
 done
 
-# start onboot containers, run to completion
-
-if [ -d /containers/onboot ]
-then
-	for f in $(find /containers/onboot -mindepth 1 -maxdepth 1 | sort)
-	do
-		base="$(basename $f)"
-		/bin/mount --bind "$f/rootfs" "$f/rootfs"
-		mount -o remount,rw "$f/rootfs"
-		/usr/bin/runc run --bundle "$f" "$(basename $f)"
-		printf " - $base\n"
-	done
-fi
-
 # start service containers
 
 if [ -d /containers/services ]

pkg/init/bin/rc.init

@@ -114,6 +114,10 @@ mount --make-rshared /var
 # make / rshared
 mount --make-rshared /
 
+# set global ulimits TODO move to /etc/limits.conf?
+ulimit -n 1048576
+ulimit -p unlimited
+
 # execute other init processes
 INITS="$(find /etc/init.d -type f | sort)"
 for f in $INITS

pkg/runc/Dockerfile

@@ -25,3 +25,4 @@ FROM scratch
 WORKDIR /
 ENTRYPOINT []
 COPY --from=alpine /usr/bin/runc /usr/bin/
+COPY etc etc/

pkg/runc/Makefile

@@ -1,4 +1,5 @@
 IMAGE=runc
 NETWORK=1
+DEPS=$(wildcard etc/init.d/*)
 
 include ../package.mk

pkg/runc/etc/init.d/010-onboot

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+# start onboot containers, run to completion
+
+if [ -d /containers/onboot ]
+then
+	for f in $(find /containers/onboot -mindepth 1 -maxdepth 1 | sort)
+	do
+		base="$(basename $f)"
+		/bin/mount --bind "$f/rootfs" "$f/rootfs"
+		mount -o remount,rw "$f/rootfs"
+		/usr/bin/runc run --bundle "$f" "$(basename $f)"
+		printf " - $base\n"
+	done
+fi