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