the header and extras image code from the rancher/os repo

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

images/10-extras/Dockerfile

@@ -0,0 +1,5 @@
+FROM alpine:3.4
+# FROM arm64=skip arm=skip
+RUN apk --purge --no-cache add kmod bash openssl
+COPY extra.sh  /usr/bin
+CMD ["extra.sh"]

images/10-extras/extra.sh

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+#!/bin/bash
+set -e
+
+DIR=$(readlink /lib/modules/$(uname -r)/build)
+STAMP=/lib/modules/$(uname -r)/.extra-done
+VER=$(basename $DIR)
+URL=${KERNEL_EXTRAS_URL:-https://github.com/rancher/os-kernel/releases/download/${VER}/extra.tar.gz}
+
+if [ -e $STAMP ]; then
+    echo Kernel extras already installed. Delete $STAMP to reinstall
+    exit 0
+fi
+
+echo Downloading $URL
+wget -O - $URL | gzip -dc | tar xf - -C /
+depmod -a
+touch $STAMP
+
+echo Kernel extras installed

images/10-headers/Dockerfile

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+FROM rancher/os-base
+COPY headers.sh  /
+CMD ["/headers.sh"]

images/10-headers/headers.sh

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+#!/bin/bash
+set -e
+
+DIR=$(readlink /lib/modules/$(uname -r)/build)
+STAMP=${DIR}/.done
+VER=$(basename $DIR)
+
+if [ "$VER" = "Ubuntu-4.4.0-23.41-rancher2" ]; then
+    VER=Ubuntu-4.4.0-23.41-rancher2-2
+fi
+
+KERNEL_HEADERS_URL=${KERNEL_HEADERS_URL:-https://github.com/rancher/os-kernel/releases/download/${VER}/build.tar.gz}
+
+if [ -e $STAMP ]; then
+    echo Headers already installed in $DIR
+    exit 0
+fi
+
+echo Downloading $KERNEL_HEADERS_URL
+mkdir -p $DIR
+wget -O - $KERNEL_HEADERS_URL | gzip -dc | tar xf - -C $DIR
+touch $STAMP
+
+echo Headers installed at $DIR

scripts/build-images

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+#!/bin/bash
+set -e
+
+export ARCH=${ARCH:-"amd64"}
+BASE=images
+
+source $(dirname $0)/version
+cd $(dirname $0)/..
+
+for i in $BASE/[0-9]*; do
+    name="os-$(echo ${i} | cut -f2 -d-)"
+    tag="${OS_REPO}/${name}:${VERSION}${SUFFIX}"
+    echo Building ${tag}
+    if [ -x ${i}/prebuild.sh ]; then
+        ${i}/prebuild.sh
+    fi
+
+    if dapper -d --build -f ${i}/Dockerfile -- -t rancher/${name} ${i}; then
+        docker tag rancher/${name} ${tag}
+    elif [ "$?" != "42" ]; then
+        exit 1
+    else
+        echo "WARN: Skipping ${tag}"
+    fi
+done