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moby--moby/contrib/download-frozen-image-v2.sh

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#!/bin/bash
set -e
# hello-world latest ef872312fe1b 3 months ago 910 B
# hello-world latest ef872312fe1bbc5e05aae626791a47ee9b032efa8f3bda39cc0be7b56bfe59b9 3 months ago 910 B
# debian latest f6fab3b798be 10 weeks ago 85.1 MB
# debian latest f6fab3b798be3174f45aa1eb731f8182705555f89c9026d8c1ef230cbf8301dd 10 weeks ago 85.1 MB
if ! command -v curl &> /dev/null; then
echo >&2 'error: "curl" not found!'
exit 1
fi
if ! command -v jq &> /dev/null; then
echo >&2 'error: "jq" not found!'
exit 1
fi
usage() {
echo "usage: $0 dir image[:tag][@digest] ..."
echo " $0 /tmp/old-hello-world hello-world:latest@sha256:8be990ef2aeb16dbcb9271ddfe2610fa6658d13f6dfb8bc72074cc1ca36966a7"
[ -z "$1" ] || exit "$1"
}
dir="$1" # dir for building tar in
shift || usage 1 >&2
[ $# -gt 0 -a "$dir" ] || usage 2 >&2
mkdir -p "$dir"
# hacky workarounds for Bash 3 support (no associative arrays)
images=()
rm -f "$dir"/tags-*.tmp
# repositories[busybox]='"latest": "...", "ubuntu-14.04": "..."'
while [ $# -gt 0 ]; do
imageTag="$1"
shift
image="${imageTag%%[:@]*}"
imageTag="${imageTag#*:}"
digest="${imageTag##*@}"
tag="${imageTag%%@*}"
# add prefix library if passed official image
if [[ "$image" != *"/"* ]]; then
image="library/$image"
fi
imageFile="${image//\//_}" # "/" can't be in filenames :)
token="$(curl -sSL "https://auth.docker.io/token?service=registry.docker.io&scope=repository:$image:pull" | jq --raw-output .token)"
manifestJson="$(curl -sSL -H "Authorization: Bearer $token" "https://registry-1.docker.io/v2/$image/manifests/$digest")"
if [ "${manifestJson:0:1}" != '{' ]; then
echo >&2 "error: /v2/$image/manifests/$digest returned something unexpected:"
echo >&2 " $manifestJson"
exit 1
fi
layersFs=$(echo "$manifestJson" | jq --raw-output '.fsLayers | .[] | .blobSum')
IFS=$'\n'
# bash v4 on Windows CI requires CRLF separator
if [ "$(go env GOHOSTOS)" = 'windows' ]; then
major=$(echo ${BASH_VERSION%%[^0.9]} | cut -d. -f1)
if [ "$major" -ge 4 ]; then
IFS=$'\r\n'
fi
fi
layers=( ${layersFs} )
unset IFS
history=$(echo "$manifestJson" | jq '.history | [.[] | .v1Compatibility]')
imageId=$(echo "$history" | jq --raw-output .[0] | jq --raw-output .id)
if [ -s "$dir/tags-$imageFile.tmp" ]; then
echo -n ', ' >> "$dir/tags-$imageFile.tmp"
else
images=( "${images[@]}" "$image" )
fi
echo -n '"'"$tag"'": "'"$imageId"'"' >> "$dir/tags-$imageFile.tmp"
echo "Downloading '${image}:${tag}@${digest}' (${#layers[@]} layers)..."
for i in "${!layers[@]}"; do
imageJson=$(echo "$history" | jq --raw-output .[${i}])
imageId=$(echo "$imageJson" | jq --raw-output .id)
imageLayer=${layers[$i]}
mkdir -p "$dir/$imageId"
echo '1.0' > "$dir/$imageId/VERSION"
echo "$imageJson" > "$dir/$imageId/json"
# TODO figure out why "-C -" doesn't work here
# "curl: (33) HTTP server doesn't seem to support byte ranges. Cannot resume."
# "HTTP/1.1 416 Requested Range Not Satisfiable"
if [ -f "$dir/$imageId/layer.tar" ]; then
# TODO hackpatch for no -C support :'(
echo "skipping existing ${imageId:0:12}"
continue
fi
token="$(curl -sSL "https://auth.docker.io/token?service=registry.docker.io&scope=repository:$image:pull" | jq --raw-output .token)"
curl -SL --progress -H "Authorization: Bearer $token" "https://registry-1.docker.io/v2/$image/blobs/$imageLayer" -o "$dir/$imageId/layer.tar" # -C -
done
echo
done
echo -n '{' > "$dir/repositories"
firstImage=1
for image in "${images[@]}"; do
imageFile="${image//\//_}" # "/" can't be in filenames :)
image="${image#library\/}"
[ "$firstImage" ] || echo -n ',' >> "$dir/repositories"
firstImage=
echo -n $'\n\t' >> "$dir/repositories"
echo -n '"'"$image"'": { '"$(cat "$dir/tags-$imageFile.tmp")"' }' >> "$dir/repositories"
done
echo -n $'\n}\n' >> "$dir/repositories"
rm -f "$dir"/tags-*.tmp
echo "Download of images into '$dir' complete."
echo "Use something like the following to load the result into a Docker daemon:"
echo " tar -cC '$dir' . | docker load"