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108 lines
3.8 KiB
Bash
Executable file
108 lines
3.8 KiB
Bash
Executable file
#!/usr/bin/env 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][@image-id] ..."
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echo " ie: $0 /tmp/hello-world hello-world"
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echo " $0 /tmp/debian-jessie debian:jessie"
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echo " $0 /tmp/old-hello-world hello-world@ef872312fe1bbc5e05aae626791a47ee9b032efa8f3bda39cc0be7b56bfe59b9"
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echo " $0 /tmp/old-debian debian:latest@f6fab3b798be3174f45aa1eb731f8182705555f89c9026d8c1ef230cbf8301dd"
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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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tag="${imageTag#*:}"
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imageId="${tag##*@}"
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[ "$imageId" != "$tag" ] || imageId=
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[ "$tag" != "$imageTag" ] || tag='latest'
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tag="${tag%@*}"
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imageFile="${image//\//_}" # "/" can't be in filenames :)
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token="$(curl -sSL -o /dev/null -D- -H 'X-Docker-Token: true' "https://index.docker.io/v1/repositories/$image/images" | tr -d '\r' | awk -F ': *' '$1 == "X-Docker-Token" { print $2 }')"
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if [ -z "$imageId" ]; then
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imageId="$(curl -sSL -H "Authorization: Token $token" "https://registry-1.docker.io/v1/repositories/$image/tags/$tag")"
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imageId="${imageId//\"/}"
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fi
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ancestryJson="$(curl -sSL -H "Authorization: Token $token" "https://registry-1.docker.io/v1/images/$imageId/ancestry")"
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if [ "${ancestryJson:0:1}" != '[' ]; then
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echo >&2 "error: /v1/images/$imageId/ancestry returned something unexpected:"
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echo >&2 " $ancestryJson"
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exit 1
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fi
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IFS=','
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ancestry=(${ancestryJson//[\[\] \"]/})
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unset IFS
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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 '$imageTag' (${#ancestry[@]} layers)..."
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for imageId in "${ancestry[@]}"; do
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mkdir -p "$dir/$imageId"
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echo '1.0' > "$dir/$imageId/VERSION"
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curl -sSL -H "Authorization: Token $token" "https://registry-1.docker.io/v1/images/$imageId/json" -o "$dir/$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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curl -SL --progress-bar -H "Authorization: Token $token" "https://registry-1.docker.io/v1/images/$imageId/layer" -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="${image//\//_}" # "/" can't be in filenames :)
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[ "$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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