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#!/bin/bash | |
image="${1:-golang}" | |
registry_url='https://registry-1.docker.io' | |
auth_url='https://auth.docker.io' | |
svc_url='registry.docker.io' | |
function auth_token { | |
curl -fsSL "${auth_url}/token?service=${svc_url}&scope=repository:library/${image}:pull" | jq --raw-output .token | |
} | |
function manifest { | |
token="$1" | |
image="$2" | |
digest="${3:-latest}" | |
curl -fsSL \ | |
-H "Authorization: Bearer $token" \ | |
-H 'Accept: application/vnd.docker.distribution.manifest.list.v2+json' \ | |
-H 'Accept: application/vnd.docker.distribution.manifest.v1+json' \ | |
-H 'Accept: application/vnd.docker.distribution.manifest.v2+json' \ | |
"${registry_url}/v2/library/${image}/manifests/${digest}" | |
} | |
function blob { | |
token="$1" | |
image="$2" | |
digest="$3" | |
file="$4" | |
curl -fsSL -o "$file" \ | |
-H "Authorization: Bearer $token" \ | |
"${registry_url}/v2/library/${image}/blobs/${digest}" | |
} | |
function linux_version { | |
echo "$1" | jq --raw-output '.manifests[] | select(.platform.architecture=="amd64") | select(.platform.os=="linux") | .digest' | |
} | |
function layers { | |
echo "$1" | jq --raw-output '.layers[].digest' | |
} | |
function config { | |
echo "$1" | jq --raw-output '.config.digest' | |
} | |
token=$(auth_token "$image") | |
amd64=$(linux_version $(manifest "$token" "$image")) | |
mf=$(manifest "$token" "$image" "$amd64") | |
blob "$token" "$image" $(config "$mf") config.json | |
i=0 | |
for L in $(layers "$mf"); do | |
blob "$token" "$image" "$L" "layer_${i}.tgz" | |
i=$((i + 1 )) | |
done |
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