add rancher/os (os-installer) Dockerfile

and installer scripts

scripts/installer/set-disk-partitions

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+set -e
+set -x
+
+DEVICE=${1}
+
+if [[ -z $DEVICE ]]; then
+    echo "Need to Pass a device name as arg1." 1>&2
+    exit 1
+fi
+
+PARTITION_COUNT=$(grep $(echo $DEVICE | cut -d '/' -f3) /proc/partitions | wc -l)
+if [ "$PARTITION_COUNT" -gt "1" ]; then
+    echo "Device ${DEVICE} already partitioned!"
+    echo "Checking to see if it is mounted"
+    
+    # Check this container first...
+    if grep -q "${DEVICE}" /proc/mounts; then
+        echo "Device is mounted, we can not repartition" 1>&2
+        exit 1
+    fi
+   
+    # Check other system containers... 
+    for container in $(system-docker ps -q); do
+        if system-docker exec $container grep -q "${DEVICE}" /proc/mounts; then
+            echo "Device is mounted in system container ${container}, we can not repartition" 1>&2
+            exit 1
+        fi
+    done
+
+    dd if=/dev/zero of=${DEVICE} bs=512 count=1
+    partprobe ${DEVICE}
+fi
+
+fdisk ${DEVICE} <<EOF
+n
+p
+1
+
+
+w
+EOF