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903129f770
* authorization token is optional * registry url is taken from X-Docker-Endpoints header * pull.sh correctly resumes partial layer downloads * detjson.py does not fail on missing keys
87 lines
2.3 KiB
Bash
87 lines
2.3 KiB
Bash
# Reference: docker src contrib/download-frozen-image.sh
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source $stdenv/setup
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# Curl flags to handle redirects, not use EPSV, handle cookies for
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# servers to need them during redirects, and work on SSL without a
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# certificate (this isn't a security problem because we check the
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# cryptographic hash of the output anyway).
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curl=$(command -v curl)
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curl() {
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[[ -n ${token:-} ]] && set -- -H "Authorization: Token $token" "$@"
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$curl \
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--location --max-redirs 20 \
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--retry 3 \
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--fail \
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--disable-epsv \
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--cookie-jar cookies \
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--insecure \
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$curlOpts \
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$NIX_CURL_FLAGS \
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"$@"
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}
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fetchLayer() {
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local url="$1"
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local dest="$2"
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local curlexit=18;
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# if we get error code 18, resume partial download
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while [ $curlexit -eq 18 ]; do
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# keep this inside an if statement, since on failure it doesn't abort the script
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if curl -C - "$url" --output "$dest"; then
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return 0
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else
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curlexit=$?;
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fi
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done
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return $curlexit
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}
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headers=$(curl -o /dev/null -D- -H 'X-Docker-Token: true' \
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"$indexUrl/$registryVersion/repositories/$imageName/images")
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header() {
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grep $1 <<< "$headers" | tr -d '\r' | cut -d ' ' -f 2
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}
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# this only takes the first endpoint, more may be provided
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# https://docs.docker.com/v1.6/reference/api/docker-io_api/
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if ! registryUrl=$(header X-Docker-Endpoints); then
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echo "error: index returned no endpoint"
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exit 1
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fi
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baseUrl="https://$registryUrl/$registryVersion"
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token="$(header X-Docker-Token || true)";
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if [ -z "$imageId" ]; then
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imageId="$(curl "$baseUrl/repositories/$imageName/tags/$imageTag")"
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imageId="${imageId//\"/}"
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if [ -z "$imageId" ]; then
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echo "error: no image ID found for ${imageName}:${imageTag}"
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exit 1
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fi
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echo "found image ${imageName}:${imageTag}@$imageId"
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fi
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mkdir -p $out
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jshon -n object \
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-n object -s "$imageId" -i "$imageTag" \
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-i "$imageName" > $out/repositories
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curl "$baseUrl/images/$imageId/ancestry" -o ancestry.json
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layerIds=$(jshon -a -u < ancestry.json)
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for layerId in $layerIds; do
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echo "fetching layer $layerId"
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mkdir "$out/$layerId"
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echo '1.0' > "$out/$layerId/VERSION"
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curl "$baseUrl/images/$layerId/json" | python $detjson > "$out/$layerId/json"
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fetchLayer "$baseUrl/images/$layerId/layer" "$out/$layerId/layer.tar"
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done
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