118 lines
3 KiB
Bash
Executable file
118 lines
3 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -e
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if ! command -v qemu-nbd &> /dev/null; then
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echo >&2 'error: "qemu-nbd" not found!'
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exit 1
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fi
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usage() {
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echo "Convert disk image to docker image"
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echo ""
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echo "usage: $0 image-name disk-image-file [ base-image ]"
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echo " ie: $0 cirros:0.3.3 cirros-0.3.3-x86_64-disk.img"
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echo " $0 ubuntu:cloud ubuntu-14.04-server-cloudimg-amd64-disk1.img ubuntu:14.04"
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}
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if [ "$#" -lt 2 ]; then
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usage
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exit 1
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fi
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CURDIR=$(pwd)
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image_name="${1%:*}"
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image_tag="${1#*:}"
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if [ "$image_tag" == "$1" ]; then
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image_tag="latest"
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fi
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disk_image_file="$2"
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docker_base_image="$3"
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block_device=/dev/nbd0
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builddir=$(mktemp -d)
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cleanup() {
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umount "$builddir/disk_image" || true
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umount "$builddir/workdir" || true
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qemu-nbd -d $block_device &> /dev/null || true
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rm -rf $builddir
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}
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trap cleanup EXIT
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# Mount disk image
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modprobe nbd max_part=63
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qemu-nbd -rc ${block_device} -P 1 "$disk_image_file"
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mkdir "$builddir/disk_image"
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mount -o ro ${block_device} "$builddir/disk_image"
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mkdir "$builddir/workdir"
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mkdir "$builddir/diff"
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base_image_mounts=""
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# Unpack base image
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if [ -n "$docker_base_image" ]; then
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mkdir -p "$builddir/base"
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docker pull "$docker_base_image"
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docker save "$docker_base_image" | tar -xC "$builddir/base"
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image_id=$(docker inspect -f "{{.Id}}" "$docker_base_image")
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while [ -n "$image_id" ]; do
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mkdir -p "$builddir/base/$image_id/layer"
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tar -xf "$builddir/base/$image_id/layer.tar" -C "$builddir/base/$image_id/layer"
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base_image_mounts="${base_image_mounts}:$builddir/base/$image_id/layer=ro+wh"
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image_id=$(docker inspect -f "{{.Parent}}" "$image_id")
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done
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fi
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# Mount work directory
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mount -t aufs -o "br=$builddir/diff=rw${base_image_mounts},dio,xino=/dev/shm/aufs.xino" none "$builddir/workdir"
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# Update files
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cd $builddir
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LC_ALL=C diff -rq disk_image workdir \
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| sed -re "s|Only in workdir(.*?): |DEL \1/|g;s|Only in disk_image(.*?): |ADD \1/|g;s|Files disk_image/(.+) and workdir/(.+) differ|UPDATE /\1|g" \
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| while read action entry; do
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case "$action" in
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ADD | UPDATE)
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cp -a "disk_image$entry" "workdir$entry"
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;;
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DEL)
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rm -rf "workdir$entry"
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;;
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*)
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echo "Error: unknown diff line: $action $entry" >&2
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;;
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esac
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done
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# Pack new image
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new_image_id="$(for i in $(seq 1 32); do printf "%02x" $(($RANDOM % 256)); done)"
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mkdir -p $builddir/result/$new_image_id
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cd diff
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tar -cf $builddir/result/$new_image_id/layer.tar *
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echo "1.0" > $builddir/result/$new_image_id/VERSION
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cat > $builddir/result/$new_image_id/json <<- EOS
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{ "docker_version": "1.4.1"
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, "id": "$new_image_id"
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, "created": "$(date -u +%Y-%m-%dT%H:%M:%S.%NZ)"
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EOS
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if [ -n "$docker_base_image" ]; then
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image_id=$(docker inspect -f "{{.Id}}" "$docker_base_image")
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echo ", \"parent\": \"$image_id\"" >> $builddir/result/$new_image_id/json
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fi
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echo "}" >> $builddir/result/$new_image_id/json
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echo "{\"$image_name\":{\"$image_tag\":\"$new_image_id\"}}" > $builddir/result/repositories
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cd $builddir/result
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# mkdir -p $CURDIR/$image_name
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# cp -r * $CURDIR/$image_name
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tar -c * | docker load
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