|
|
@@ -0,0 +1,113 @@
|
|
|
+#!/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'
|
|
|
+ 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"
|
Jessica Frazelle