| #!/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 |
| |
| 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 |
| 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" |