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+#!/usr/bin/env bash

+set -e

+

+if ! command -v qemu-nbd &> /dev/null; then

+  echo >&2 'error: "qemu-nbd" not found!'

+  exit 1

+fi

+

+usage() {

+  echo "Convert disk image to docker image"

+  echo ""

+  echo "usage: $0 image-name disk-image-file [ base-image ]"

+  echo "   ie: $0 cirros:0.3.3 cirros-0.3.3-x86_64-disk.img"

+  echo "       $0 ubuntu:cloud ubuntu-14.04-server-cloudimg-amd64-disk1.img ubuntu:14.04"

+}

+

+if [ "$#" -lt 2 ]; then

+  usage

+  exit 1

+fi

+

+CURDIR=$(pwd)

+

+image_name="${1%:*}"

+image_tag="${1#*:}"

+if [ "$image_tag" == "$1" ]; then

+  image_tag="latest"

+fi

+

+disk_image_file="$2"

+docker_base_image="$3"

+

+block_device=/dev/nbd0

+

+builddir=$(mktemp -d)

+

+cleanup() {

+  umount "$builddir/disk_image" || true

+  umount "$builddir/workdir" || true

+  qemu-nbd -d $block_device &> /dev/null || true

+  rm -rf $builddir

+}

+trap cleanup EXIT

+

+# Mount disk image

+modprobe nbd max_part=63

+qemu-nbd -rc ${block_device} -P 1 "$disk_image_file"

+mkdir "$builddir/disk_image"

+mount -o ro ${block_device} "$builddir/disk_image"

+

+mkdir "$builddir/workdir"

+mkdir "$builddir/diff"

+

+base_image_mounts=""

+

+# Unpack base image

+if [ -n "$docker_base_image" ]; then

+  mkdir -p "$builddir/base"

+  docker pull "$docker_base_image"

+  docker save "$docker_base_image" | tar -xC "$builddir/base"

+

+  image_id=$(docker inspect -f "{{.Id}}" "$docker_base_image")

+  while [ -n "$image_id" ]; do

+    mkdir -p "$builddir/base/$image_id/layer"

+    tar -xf "$builddir/base/$image_id/layer.tar" -C "$builddir/base/$image_id/layer"

+

+    base_image_mounts="${base_image_mounts}:$builddir/base/$image_id/layer=ro+wh"

+    image_id=$(docker inspect -f "{{.Parent}}" "$image_id")

+  done

+fi

+

+# Mount work directory

+mount -t aufs -o "br=$builddir/diff=rw${base_image_mounts},dio,xino=/dev/shm/aufs.xino" none "$builddir/workdir"

+

+# Update files

+cd $builddir

+diff -rq disk_image workdir \

+  | sed -re "s|Only in workdir(.*?): |DEL \1/|g;s|Only in disk_image(.*?): |ADD \1/|g;s|Files disk_image/(.+) and workdir/(.+) differ|UPDATE /\1|g" \

+  | while read action entry; do

+      case "$action" in

+        ADD|UPDATE)

+          cp -a "disk_image$entry" "workdir$entry"

+          ;;

+        DEL)

+          rm -rf "workdir$entry"

+          ;;

+        *)

+          echo "Error: unknown diff line: $action $entry" >&2

+          ;;

+      esac

+    done

+

+# Pack new image

+new_image_id="$(for i in $(seq 1 32); do printf "%02x" $(($RANDOM % 256)); done)"

+mkdir -p $builddir/result/$new_image_id

+cd diff

+tar -cf $builddir/result/$new_image_id/layer.tar *

+echo "1.0" > $builddir/result/$new_image_id/VERSION

+cat > $builddir/result/$new_image_id/json <<-EOS

+{ "docker_version": "1.4.1"

+, "id": "$new_image_id"

+, "created": "$(date -u +%Y-%m-%dT%H:%M:%S.%NZ)"

+EOS

+

+if [ -n "$docker_base_image" ]; then

+  image_id=$(docker inspect -f "{{.Id}}" "$docker_base_image")

+  echo ", \"parent\": \"$image_id\"" >> $builddir/result/$new_image_id/json

+fi

+

+echo "}" >> $builddir/result/$new_image_id/json

+

+echo "{\"$image_name\":{\"$image_tag\":\"$new_image_id\"}}" > $builddir/result/repositories

+

+cd $builddir/result

+

+# mkdir -p $CURDIR/$image_name

+# cp -r * $CURDIR/$image_name

+tar -c * | docker load